30 December 2021, Volume 52 Issue 12
    

  • Select all
    |
    Focuses & Concerns(The Project of Chongqing Press Fund in 2020)
  • Research advances in geopolymer erosion resistance in water environment
    YANG Liyun, YANG Shuangjian, GAO Mengdan, BAI Hao
    Journal of Functional Materials. 2021, 52(12): 12001-12007. https://doi.org/10.3969/j.issn.1001-9731.2021.12.001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Geopolymer is a new green building material with excellent mechanical strength and high temperature resistance. In addition, geopolymer has a wide range of raw materials and can be made from industrial solid wastes containing silicon and aluminum. Therefore, geopolymer, as a green building material, has many advantages, such as excellent performance, simple process, low energy consumption and low carbon emission, and has broad application prospects. However, when geopolymer is used in water environment, its anti-erosion performance in water needs further comprehensive analysis. Here, based on summarizing the preparation technology and synthesis mechanism of geopolymer, this paper analyzes the effects of raw materials and curing methods of geopolymer on its corrosion resistance, and then determines the erosion resistance of its three-dimensional network structure and counter cations. Finally, the research prospect of geopolymer's erosion resistance in water is put forward.
  • Preparation and mechanical properties of cement concrete modified by waterborne epoxy resin
    ZHONG Xin
    Journal of Functional Materials. 2021, 52(12): 12008-12012. https://doi.org/10.3969/j.issn.1001-9731.2021.12.002
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The waterborne epoxy resin was introduced into cement concrete,by adjusting the content of waterborne epoxy resin,cement concrete with different content of waterborne epoxy resin (0%, 2wt%, 4wt% and 6wt%) was prepared.The effects of epoxy resin modification on mechanical properties,impermeability and micro morphology of cement concrete were studied.The results showed that with the increased of the content of waterborne epoxy resin,the compressive strength,flexural strength and dry density of the modified concrete at 7 and 28 d showed a trend of first increasing and then slightly decreasing.When the content of waterborne epoxy resin was 4wt%,the compressive strength,flexural strength and dry density of concrete reached the maximum,which were 41.15,8.67 MPa and 278.6 kg/m3 respectively.With the increased of the content of waterborne epoxy resin,the water absorption of the modified concrete decreased at first and then slightly increased,and when the content of waterborne epoxy resin was 4wt%,the lowest water absorption was 28.3%.With the increased of the content of waterborne epoxy resin,the water resistance pressure,seepage pressure and impermeability grade of concrete increased gradually,and the higher the content of waterborne epoxy resin,the stronger the impermeability.SEM analysis showed that with the increased of the content of waterborne epoxy resin,the pore size of modified concrete first decreased and then increased,and when the content of waterborne epoxy resin was 4wt%,the pore size was about 2-3 mm.On the whole,when the content of waterborne epoxy resin was 4wt%,the comprehensive performance of modified concrete was the best.
  • Research of application of phase change materials in road engineering:a review
    CAI Xinchen, LIU Zhibin, ZHANG Yun, BAI Mei, LIU Feng
    Journal of Functional Materials. 2021, 52(12): 12013-12021. https://doi.org/10.3969/j.issn.1001-9731.2021.12.003
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Phase change material is a latent heat energy storage material with great potential in road engineering applications, which can effectively improve rutting, deformation, frost cracking and other road diseases under high and low temperature conditions. The selection criteria for application of phase change materials in road engineering are discussed. The preparation methods of composite phase change materials and the research results of road composite phase change materials in terms of thermophysical properties and microstructure are reviewed. The effects of the incorporation of phase change materials on the basic properties of asphalt mixtures, water stability, high-temperature deformation and low-temperature crack resistance of roads are summarized. The temperature regulation mechanism and effect of roads with phase change materials are analyzed, and the research direction of phase change materials in road engineering is discussed.
  • The influence of many factors on the development trend of the mechanical properties of self-compacting concrete
    ZHENG Chuanlei, WANG Jinhao, JIN Baohong, ZHOU Surong, LI Shuxiang, ZHAO Yadi
    Journal of Functional Materials. 2021, 52(12): 12022-12029. https://doi.org/10.3969/j.issn.1001-9731.2021.12.004
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Orthogonal test was used to analyze the influence of four factors on the mechanical properties of self-compacting concrete: the number of microwave heating modification, the replacement rate of recycled coarse aggregate, the replacement rate of steel slag sand and the content of polypropylene fiber. The results show that the replacement rate of steel slag sand has a significant effect on compressive strength, splitting strength and bending strength, the replacement rate of recycled coarse aggregate has a significant effect on compressive strength and splitting strength, and the microwave modification times and polypropylene fiber content have little effect on strength. Microwave heating modification can improve the quality of reclaimed coarse aggregate to some extent, but the effect is not significant, and the implementation process is time-consuming and laborious, which is difficult to meet the requirements of industrial production. According to the results of measuring range and variance analysis, the optimal mixture ratio is 10 times microwave heating modification, 70% regenerated coarse aggregate replacement ratio, 45% steel slag sand replacement ratio and 0.10% polypropylene fiber content. The new relationship between tensile strength, bending strength and compressive strength obtained by nonlinear regression fitting is compared with that established by other scholars. It is found that the new relationship is in good agreement with the experimental data and has certain reference value.
  • The influence of magnesia whisker on early strength of magnesium phosphate cement under severe cold environment
    JIA Xingwen, LIAN Lei, TU Jun, TIAN Hao, HOU Tiejun, WANG Ping
    Journal of Functional Materials. 2021, 52(12): 12030-12035. https://doi.org/10.3969/j.issn.1001-9731.2021.12.005
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The emergency repair and maintenance of important infrastructure in cold winter require the use of high early strength repair materials that can quickly set and harden under severe cold and no maintenance conditions. Magnesium phosphate cement (MPC) is often used to prepare rapid repair materials, but its early mechanical properties are significantly reduced in severe cold environment. The influences of highly active magnesia whiskers on the early hydration characteristics, mechanical properties and hydration products of MPC cured at (-20±2)℃ are studied. The results show that magnesia whiskers hydrate rapidly and significantly increase the initial temperature of MPC slurry at (-20±2)℃. The peak temperature rise of MPC with the content of magnesia whiskers of 1% to 3% reaches 60 to 70 ℃, and the 2 h compressive strength and 2 h flexural strength reach 25.4 and 6.6 MPa, respectively. The rapid hydration of magnesia whisker promotes the smooth progress of acid-base reaction of MPC, and the struvite produced by the rapid hydration of magnesia whiskers acts as a crystal seed to induce crystallization, which promotes the early hydration of MPC and the growth of struvite crystal, so that MPC still has high early strength even in severe cold environment.
    • Review & Advance
  • Research progress on the carbonation-hardening properties of CO2 sequestered low-calcium cementitious materials
    ZHANG Cheng, LIU Songhui, CHANG Xiangxaing, ZHAO Songhai, FANG Jingrui, GUAN Xuemao
    Journal of Functional Materials. 2021, 52(12): 12036-12042. https://doi.org/10.3969/j.issn.1001-9731.2021.12.006
    Abstract ( ) Download PDF ( ) Knowledge map Save
    As a new type of cementitious material system, the low-calcium cementitious material system can react with carbon dioxide to produce stable calcium carbonate and highly polymerized silica gel, which is in line with the current policy guidelines of the cement industry requiring CO2 emission reduction. In order to better understand the low-calcium cementitious materials system, this paper reviews the carbonation reaction process of low-calcium cementitious materials, analyzes the influence of different factors on the CO2 uptakes ability of this system, and the related hardening properties of the carbonation hardened pastes, and presents the prospect of the subsequent development of low-calcium cementitious materials.
  • Research progress of modified nano-SiO2 composite coating on concrete surface
    ZHENG Bin, SONG Jiale, YUAN Chi, SUN Yaoyao, Li Weiguang
    Journal of Functional Materials. 2021, 52(12): 12043-12047. https://doi.org/10.3969/j.issn.1001-9731.2021.12.007
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In recent years, nano-SiO2 has been widely used to improve the performance of concrete due to its high activity and good stability. Nano-SiO2 modified by silane coupling agent can be effectively dispersed in polymer coating to enhance the durability of concrete. This paper mainly introduces the modification mechanism of nano-SiO2 by silane coupling agent, and systematically discusses the influence relationship between the modified nano-SiO2 composite coating and the hydration performance, hydrophobic performance, carbonization resistance and chloride ion resistance of concrete. Finally, the shortcomings of existing research are pointed out, and the development trend of this direction is indicated.
    • Research & Development
  • Study on mold-inhibiting modification for the sphagnum/diatomite composite humidity-controlling materials
    HU Mingyu, YAN Sheng, HU Yuqian
    Journal of Functional Materials. 2021, 52(12): 12048-12054. https://doi.org/10.3969/j.issn.1001-9731.2021.12.008
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Wall mildew not only affects the use of houses, but also seriously threatens human health, especially in hot and humid areas in southern China. In the paper, the mold-inhibiting properities of thesphagnum /diatomite composite humidity-controlling materials and its components, and bacteriostatic agent MgO and nano MgO on the molds of Paecilomyces varioti, Aureobasidium pullulans and Aspergillus flavus were studied. On the basis of this research, the improvement effect of the humidity-controlling materials compounded with MgO on the mold inhibition of the Aspergillus flavus was studied. UV-visible spectrophotometer and ultramicro spectrophotometer were used to analyze the active O-2 and the nucleic acid leakage of the hyphae. TEM, ESEM and EDS were used to analyze the changes of the morphology and omposition of mold's hyphaes and spores. The mechanism of inhibiting mold was explored by the methods above. The results show that compounding MgO could greatly improve the inhibition effect of sphagnum /diatomite composite humidity-controlling materials on molds. The active O-2 produced by vanadium iron slag in the sphagnum /diatomite composite humidity-controlling materials and MgO has strong oxidation ability, which can damage the cell wall and membrane of mold's hyphaes and spores. The O-2 damages the permeability of the hyphaes and spores, which destroys the internal structure of mold cells, and obstructs the normal metabolism of the mold cells, and even causes the death of the cells.
  • Experimental investigation on performance of polyvinyl alcohol fiber modified EPS concrete
    LIU Fengli, WEI Kaiyan, YANG Feihua, MA Baoguo, ZHAN Jiayu, LI Sha
    Journal of Functional Materials. 2021, 52(12): 12055-12060. https://doi.org/10.3969/j.issn.1001-9731.2021.12.009
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Recycled expanded polystyrene (EPS) particles were used as lightweight aggregate to prepare lightweight EPS concrete. Using polyvinyl alcohol fiber (PVA) as modified material, effects of PVA content on the workability, water absorption, mechanical properties, thermal conductivity, drying shrinkage and frost resistance of EPS concrete were investigated, and it's modification mechanism was discussed. The results indicate that the fluidity of EPS concrete decreases continuously with the addition of PVA, but has little effect on the bulk weight. Compared with the blank sample, when the PVA content is 0.8%, the water absorption rate is reduced by 27.7%, the 28 d compressive strength, splitting tensile strength and flexural strength are increased by 18.5%, 57.1% and 50% respectively. When the content of PVA is less than 1.2%, tension-compression ratio of EPS concrete increases steadily. PVA shows significant effect on the crack resistance and toughness of EPS concrete. The thermal conductivity of concrete decreases gradually, which improves the thermal insulation of concrete. Based on the analysis of the influence law and mechanism of PVA on the performance of EPS concrete, the optimum content is 0.8%.
  • Preparation and properties of aluminum foaming agent modified cement-based composite foaming material
    CHENG Xiying, YANG Ruimin, MA Lu
    Journal of Functional Materials. 2021, 52(12): 12061-12065. https://doi.org/10.3969/j.issn.1001-9731.2021.12.010
    Abstract ( ) Download PDF ( ) Knowledge map Save
    On the basis of Portland cement, phenolic resin was introduced, and aluminum foaming agent with different contents (0,3wt%,6wt% and 9wt%) was added to prepare aluminum foaming agent modified cement-based composite foaming materials.The mechanical properties,micro morphology and thermal conductivity of the composite foam were analyzed by universal material testing machine,SEM and flat thermal conductivity meter.The results showed that the compressive strength of the composite foam increased first and then decreased with the increased of the content of aluminum foaming agent,when the content of aluminum foaming agent was 6wt%, the compressive strength of the sample reached the maximum value of 7.2 MPa. With the increased of the content of aluminum foaming agent,the bulk density of the composite foams decreased at first and then slightly increased,when the content of aluminum foaming agent was 6wt%, the bulk density of the sample reached the minimum value of 217.4 kg/m3.With the increased of the content of aluminum foaming agent,the water absorption of the composite foamed materials showed the trend of rapid rise, slow decline and rapid rise,when the content of aluminum foaming agent was 9wt% fraction, the water absorption of the sample reached the maximum value,which was 21.7%.SEM analysis showed that there were less and uneven pores in the matrix without al foaming agent, but more large pores,with the addition of aluminum foaming agent, the number of pores increased significantly and the distribution gradually became uniform,while the number of large-size pores decreased significantly and the structure of pore wall became more compact.With the increased of the content of aluminum foaming agent,the thermal conductivity of the composite foamed material showed a decreasing trend,when the content of aluminum foaming agent were 6wt% and 9wt%,the thermal conductivity of the sample begins to decreased slowly,and the reduction was only 5.41%.Therefore,with the addition of aluminum foaming agent,the thermal insulation properties of the matrix were improved,considering the mechanical properties,bulk density,water absorption and thermal conductivity, the optimum content of aluminum foaming agent in the modified cement-based composite foaming material was 6wt%.
  • Effect of pre-treated fine lightweight aggregates on damping and durability of concrete
    HUANG Xianlong, TIAN Yaogang, SHI Shuaifeng, JIANG Jing, HAO Xiaoyu, QI Lin, JIA Kan
    Journal of Functional Materials. 2021, 52(12): 12066-12071. https://doi.org/10.3969/j.issn.1001-9731.2021.12.011
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The effects of three kinds of pre -treated fine lightweight aggregates, which were pre-saturated with water, pre-saturated with styrene-acrylic emulsion and wrapped in styrene-acrylic emulsion at surface respectively, on the damping performance, strength, shrinkage and frost resistance of concrete were compared and analyzed in this paper. The scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS) was also used to test and analyze the microstructure of three kinds of concrete prepared by the corresponding pre-treated lightweight aggregates. The results show that all the three kinds of pre-treated lightweight aggregates can improve the damping performance, shrinkage and frost resistance of concrete. The performance of concrete is enhanced by both the lightweight aggregates pre-saturated with styrene-acrylic emulsion and the lightweight aggregates wrapped in styrene-acrylic emulsion at surface to a certain extent. The microscopic test results show that the interfacial transition zone of the three types of pre-treated lightweight aggregates is dense. The cement hydration products can fill some pores of the lightweight aggregates, and the polymer adsorbed in the lightweight aggregates can polymerize into films in the pores and form interpenetrating structures with the hydration products.
  • Effect of rubber particle size and content on properties of recycled concrete
    TU Yanping, CHENG Ziyang, CHENG Shuikai, CHEN Guofu
    Journal of Functional Materials. 2021, 52(12): 12072-12078. https://doi.org/10.3969/j.issn.1001-9731.2021.12.012
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Rubber particles (RP) with particle size of 0.178, 0.42, 0.84 and 1-3 mm were used to replace natural fine aggregate (NFA) with contents of 0, 1%, 3% and 5%. The effects of RP particle size and content on the properties of recycled concrete (RC) were studied. The results show that the gas content of RC increases with the addition of RP. When the diameter of RP is 0.178 mm and the content of RP is 5%, the gas content reaches the maximum. When the diameter of RP is 1-3 mm and the dosage is 5%, RC slump is the largest. With the increase of RP content, the compressive strength, splitting tensile strength, chloride ion permeability resistance and capillary water absorption performance of RC gradually become worse, and the negative effect gradually decreases with the increase of RP particle size. The addition of RP can increase the tensile/compression ratio of RC and improve the ductility of RC. When the diameter of RP is 0.178 mm and the dosage is 5%, the tension-pressure ratio is the maximum. There is an obvious transition zone (ITZ) between RP and mortar. There are a lot of pores in the mortar nearby, and the hydration products are poorly developed and distributed, and the overall compactness is poor, which is a weak zone in RC.
  • Preparation,mechanics and durability of nano-TiO2 modified cement concrete
    ZHANG Xiaoyi
    Journal of Functional Materials. 2021, 52(12): 12079-12083. https://doi.org/10.3969/j.issn.1001-9731.2021.12.013
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Using P·O 42.5 portland cement as raw material and nano-TiO2 as filler,modified cement concrete with different nano-TiO2 content (0,1wt%,3wt% and 5wt%) was prepared.The mechanical properties,micro morphology and durability of the concrete were analyzed and tested.The results show that with the increase of nano-TiO2 content,the compressive strength of modified concrete at 7 and 28 d gradually increases, and the flexural strength at 28 d first increases and then decreases.When the content of nano-TiO2 is 5wt%,the compressive strength reaches the maximum at 7 and 28 d,which are 38.11 and 49.35 MPa respectively,and when the content of nano-TiO2 is 3wt%,the flexural strength reaches the maximum value of 6.72 MPa at 28 d.SEM analysis shows that after adding an appropriate amount of nano-TiO2,the pore content of modified concrete decreases and the compactness of matrix increases.However,after adding an excessive amount of nano-TiO2,there will be agglomeration,which will affect the gain effect of nanoparticles.The wear performance test found that with the increase of nano-TiO2 content,the wear of modified concrete decreased first and then increased,when the content of nano-TiO2 is 3wt%, the wear amount is at least 1.05 kg/m2.The analysis of carbonation resistance shows that with the increase of nano-TiO2 content,the carbonation depth of modified concrete decreases first and then increases slightly,when the content of nano-TiO2 is 3wt%,the carbonization depth at 7 and 28 d is the smallest,which is 1.35 and 4.03 mm,respectively.Comprehensive analysis shows that when the content of nano-TiO2 is 3wt%,the comprehensive performance of modified cement concrete is the best.
  • Life prediction of basalt fiber recycled concrete based on frost resistance index
    HOU Yongli, LYU Dongshuo, ZHOU Leilei, YANG Xinchenrui
    Journal of Functional Materials. 2021, 52(12): 12084-12089. https://doi.org/10.3969/j.issn.1001-9731.2021.12.014
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Based on the test results of frost resistance of basalt fiber recycled concrete (BFRC), this paper establishes the prediction model of frost resistance of BFRC by using four forms of original difference grey model(ODGM), even grey model(EGM), even difference grey model (EDGM) and discrete grey model(DGM) of GM (1,1) model, and predicts the service life of BFRC affected by single factor of freeze-thaw cycle in Inner Mongolia, and compare the accuracy and long-term prediction results by assigning value and introducing correlation coefficient R2.The test and analysis results show that, The decay rate of the BFRC mass and the relative dynamic elastic modulus gradually accelerates as the freeze-thaw cycle proceeds, However, the incorporation of basalt fibers (BF) can effectively slow down the decay rate of both, Ensure that BFRC meets the design requirements of primary highway or highway for 30 years in freezing resistance; Comparing the accuracy of the model and the service life, Although all 4 models had a prediction accuracy of grade I, However, there are differences in the model accuracy, When the BF incorporation is not higher than 0.1%, It is recommended to use the DGM model for prediction, Conversely, the EGM model can be used for predict; In terms of life-span prediction, The ODGM model is not recommended due to unstable factors in life prediction.
  • Study on compatibility and synergistic mechanism of nano materials and alkali free accelerator
    GAO Ruijun, GUO Junhua, LIN Zejian, WANG Hongxia, GAO Chunyong
    Journal of Functional Materials. 2021, 52(12): 12090-12094. https://doi.org/10.3969/j.issn.1001-9731.2021.12.015
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Nano materials can significantly enhance the mechanical properties and durability of cement-based materials. In order to expand the application of nano materials in shotcrete, the effects of different kinds and dimensions of nano materials on the setting time of cement paste and the compressive strength of mortar were studied in this paper under the condition of fixed content of liquid alkali-free accelerator. The synergistic promotion mechanism between nano materials and alkali-free accelerator was also analyzed. The results show that different kinds of nano materials have different effects on the setting time of cement paste, and the setting time of cement paste can be shorten by all nano materials. The influence degree of zero dimensional nano SiO2 is the greatest, which the setting time is reduced from 110 s of the blank group to 65 s. Meanwhile, the 6 h and 1 d compressive strength of mortar with zero dimensional nano SiO2 increased by 22.8% and 41.2% respectively. XRD and SEM results show that the good compatibility between nano materials and accelerator attributes to the chemical reaction activity and high water demand of nano materials. The actual ratio of the water to cement and the content of ettringite and calcium hydroxide hydration products were reduced and promoted respectively through the effects of filling effect, crystal nucleus effect, chemical reaction activity and interface transition zone structure optimization, thus, the setting time of the cement paste is shortened and the compressive strength of cement mortar is improved.
  • Research on preparation and mechanical properties of fiber reinforced concrete composite materials
    DAI Li, YANG Feng, ZHOU Meirong, FU Renjian
    Journal of Functional Materials. 2021, 52(12): 12095-12099. https://doi.org/10.3969/j.issn.1001-9731.2021.12.016
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of fiber reinforced concrete composites with different fiber contents (0,1vol%, 2vol% and 3vol%) were prepared by adding polyvinyl alcohol fiber into concrete.The compressive strength,splitting tensile strength,elastic modulus,fluidity,water absorption and phase structure of the fiber reinforced concrete composites were studied by mechanical property test,flow property test,water absorption test and FT-IR analysis.The results showed that with the increased of polyvinyl alcohol fiber content,the compressive strength,splitting tensile strength and elastic modulus of fiber reinforced concrete composites at 7 and 28 d increased first and then decreased.When the fiber content was 2vol%,the compressive strength,splitting tensile strength and elastic modulus of the composites reached the maximum at 7 and 28 d.With the increased of fiber content,the slump expansion and radial length of fiber reinforced concrete composites gradually decreased,and the fluidity of concrete composites decreased after fiber addition.When the fiber content was 3vol%,the minimum slump radial length was 585 mm.With the increased of fiber content,the water absorption of fiber reinforced concrete composites decreased first and then increased,when the fiber content was 2vol%,the minimum water absorption of fiber reinforced concrete composites was 22.1%.The added polyvinyl alcohol fiber affects the hydration reaction and hinders the diffusion of Ca2+ in the matrix,polyvinyl alcohol fiber formed a dense film network structure in the matrix,which enhanced the connection ability between the components of concrete composites,and improved the toughness and strength of fiber reinforced concrete.
  • Research on electrical properties and performance of deicing and snow-melting of the modified mortar blended with graphene/graphene oxide
    YUAN Xiaoya, ZHANG Weifu, CAO Panlei, YANG Sen, Qin Yinjun
    Journal of Functional Materials. 2021, 52(12): 12100-12109. https://doi.org/10.3969/j.issn.1001-9731.2021.12.017
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Since graphene (G) is prone to agglomerate in cement paste, the current research on graphene-based materials blending cement-based materials mainly focuses on graphene oxide (GO) with better dispersion performance. Reports of G/GO co-blending are relatively rare. For the preparation of structure-function integrated cement-based composite materials, this paper uses G as a conductive filler, and with the aid of GO's dispersing effect on G, the mechanical properties, conductivity, electric heating performance and snow melting and ice melting functions of cement mortars with different G contents are studied. The 28 d mechanical performance test shows that when the dosage of G reaches the optimal content of 0.3%, the flexural compressive strength is increased by 45% and 35.7% compared to blank specimen, and 31.8% and 24.1% higher than that of single-doped GO specimen. Structural tests show that G and GO can jointly promote the process of cement hydration, regulate the formation of flower-like crystals from cement hydration products, and compact the structure of cement stone. Electrical performance tests have found that the percolation threshold of graphene conductive cement-based materials is 0.5%. What's more, good mechanical and conductive heating performance are shown under the threshold, the temperature of mortar specimen can be increased by 15.2 ℃for 1 h with 60 V voltage, and the ice melting process can be significantly accelerated at a constant indoor temperature. 5 mm thick ice layer can be basically melted within 25 minutes, so it possesses good potential for deicing and snow-melting.
  • Study on performace of wollastonite reinforced fly ash-basedgeopolymer
    WU Hao, WANG Yanping, CHEN Changxu, SHEN Ji
    Journal of Functional Materials. 2021, 52(12): 12110-12115. https://doi.org/10.3969/j.issn.1001-9731.2021.12.018
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Through the single addition of wollastonite, a kind of fiber reinforced fly ash base geopolymer is prepared, and universal testing machine, sandblasting testing machine, sulfate erosion method are conducted so as to investigate the influence of wollastonite on fly ash base geopolymer. It is turned out that the wollastonite content of 2.0 wt% provides the fly ash base geopolymer with the best performance. Contrasted with geopolymer samples without wollastonite, the compressive strength and flexural strength are increased by 49.7% and 10.3%, respectively, and the erosion rate is reduced by 54.3%. Nevertheless, sulfate erosion would severely hinder the development of compressive strength in contrast with those under standard curing, and the compressive strength reduces relevantly with the increase of wollastonite.
  • Study on influencing factors of high and low temperature and rheological properties of rice straw fiber asphalt mortar
    CHENG Peifeng, WANG Cong, ZHANG Kaiyuan, YANG Fan
    Journal of Functional Materials. 2021, 52(12): 12116-12122. https://doi.org/10.3969/j.issn.1001-9731.2021.12.019
    Abstract ( ) Download PDF ( ) Knowledge map Save
    At present, China's economic development level is increasing, which greatly promotes the prosperity and development of transportation industry. Modified asphalt is one of the most important pavement construction materials in middle and high grade highways. However, the increasing heavy traffic and precipitation and
    snow make asphalt pavement more and more seriously threatened. Extensive research and a large number of engineering practice have proved that using fiber to prepare asphalt mortar can improve the high and low temperature performance of asphalt mortar and improve the quality of pavement engineering to a certain extent. Rice straw fiber is a natural, green and renewable environmental protection material. It has abundant resources, can reduce the pollution of straw burning to the environment, and has low cost, good toughness and high tensile strength. Therefore, it is gradually used as a modifier in asphalt and mixture. Therefore, in order to explore the influence of rice straw and powder-binder ratio on the rheological properties of asphalt mortar at high and low temperatures, rice straw fiber is used as modifier to prepare rice straw fiber asphalt mortar. The orthogonal test method is used to design three factors and three levels orthogonal test table. The dynamic shear rheological test and bending beam rheological test of rice straw fiber asphalt mortar with different fiber content, length and powder-binder ratio are carried out. The influence of rice straw on the high and low temperature properties of asphalt mortar is evaluated. The influence of different factors on the rheological properties is analyzed and the optimal preparation process is given. The results show that all factors have different effects on the rheological properties of rice straw fiber asphalt mortar at high and low temperatures. The powder-binder ratio plays a decisive role in its performance. The increase of powder-binder ratio significantly enhances the high temperature deformation resistance of fiber asphalt mortar, but at the same time, the stiffness modulus increases sharply and the low temperature crack resistance decreases greatly. Therefore, the powder-binder ratio is recommended to be 1.0-1.2. With the increase of fiber content and length of rice straw, the high-temperature performance of fiber asphalt mortar shows a trend of first enhancement and then weakening. The fiber asphalt mortar with fiber content of 4% and length of 9 mm has the best low-temperature crack resistance at -12 ℃ and -18 ℃. Combined with the high and low temperature performance analysis of fiber asphalt mortar, it is recommended that the fiber length of 9 mm and the content of 4% are the best preparation process.
  • Effect of graphene oxide on microstructure and mechanical properties of concrete
    ZENG Jijun, GAO Zhanyuan, RUAN Dong
    Journal of Functional Materials. 2021, 52(12): 12123-12128. https://doi.org/10.3969/j.issn.1001-9731.2021.12.020
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to explore the influence of graphene oxide (GO) on the structure and mechanical properties of concrete, five kinds of GO dispersions are prepared to study the compressive and splitting tensile properties of cube concrete specimens at different ages. The microstructure of concrete is analyzed by scanning electron microscope, and the micro mechanism of improving mechanical properties is given. The results show that the microstructure of GO concrete is compact and orderly, the hydration and condensation of coarse aggregate interface are more complete, therefore, the compressive and splitting tensile strength of concrete have been significantly improved. When the content of GO is 0.07% and 0.09%, the compressive strength and splitting tensile strength of concrete increase by 30.64% and 29.71% respectively, and both increase greatly when the content is 0.07%. Meanwhile, GO can improve the ductility of concrete.
  • Molecular dynamics simulation of the interface mechanical properties of graphene modified asphalt
    ZHOU Kun, HUANG Jun, DENG Yadan, HUANG Lixin
    Journal of Functional Materials. 2021, 52(12): 12129-12136. https://doi.org/10.3969/j.issn.1001-9731.2021.12.021
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Molecular dynamics simulation drawing experiments are used to study the interface mechanical properties of graphene-modified asphalt. Molecular dynamics simulation is used to obtain the density and glass transition temperature of asphalt four component model, and the correctness of the asphalt model is verified by comparing the simulation results with the experimental values. On this basis, the graphene modified asphalt composite model is established. The drawing experiment is simulated using the speed method to obtain the relationship between the interface stress and the separation displacement. This relationship is consistent with the trend described by the cohesion zone model obtained under the macroscopic state, and the exponential cohesive zone model is in better agreement with the simulation results. Finally, the influence of speed on stress response is discussed. It is found that different loading rates have a greater impact on the interfacial bond strength. At high loading rate, the failure of graphene modified asphalt is interfacial bonding failure, while at low loading rate, it is asphalt cohesion failure. Based on molecular dynamics simulation, the micro failure mechanism of graphene modified asphalt is explored. The simulation results are consistent with the macro failure law, which lays a foundation for further building a cross-scale model.
    • Process& Technology
  • Basalt fiber asphalt mixture design and road performance research based on response surface methodology
    MA Feng, YAN Zhibin, FU Zhen, GUO Xinglong, WEN Yalu, YANG Tiantian
    Journal of Functional Materials. 2021, 52(12): 12137-12142. https://doi.org/10.3969/j.issn.1001-9731.2021.12.022
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to improve the improvement effect of basalt fiber on asphalt mixture, response surface methodology is used to design and study, and the best blending method of basalt fiber modified asphalt mixture is obtained. The fiber asphalt mixture is prepared according to the optimized scheme, and the road performance is analyzed through rutting test, low-temperature bending test, freeze-thaw splitting test and four-point bending fatigue test. The test results show that the best optimization scheme of basalt fiber length and content is fiber length of 6 mm and the fiber content of 6%. The incorporation of basalt fiber can optimize the performance under high temperature conditions and water damage resistance of asphalt mixture. The dynamic stability and freeze-thaw splitting strength ratio of the mixture with best fiber content are 252.4% and 113.1% of those of the base asphalt mixture, respectively. At the same time, fiber can improve the low temperature performance and prolong the fatigue life of asphalt mixture, but when the fiber length and content are too large, the improvement effect on the high and low temperature performance and water stability will be weaken.
  • Preparation and performance characterization of decanoic acid-hexadecanol/fumed silica shaped phase change composite materials
    ZHANG Jintao, YIN Guansheng, SHI Minghui, LIU Yong, WEI Pengfei, FENG Junjie, ZHENG Xiaohai
    Journal of Functional Materials. 2021, 52(12): 12143-12151. https://doi.org/10.3969/j.issn.1001-9731.2021.12.023
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to find a phase change material suitable for the construction field, this research proposes a decanoic acid (DA)-hexadecanol (HD) eutectic phase change material with suitable phase change temperature and higher latent heat. The hydrophobic fumed silica is used as porous adsorbent materials to prepare the shaped composite phase change material with different adsorption rates, and the thermophysical properties of the shaped composite phase change material with the largest DA-HD adsorption rate have been investigated. Hydrophobic fumed silica is used as the adsorbent material, and the shaped composite phase change material is prepared by the porous material adsorption method. The structure and performance of DA-HD/fumed silica shaped composite phase change material are characterized by DSC, FT-IR, SEM and TGA. Results show that the best mass ratio of DA to HD in DA-HD eutectic phase change material is 71.81:28.19, the phase change temperature is 23.64 ℃, and the phase change latent heat is 174.5 J/g. DA-HD eutectic phase change material is adsorbed into the nanopores of fumed silica to form a stable three-dimensional structure, with a maximum adsorption rate of 60%, and the adsorption process is only physical combination without chemical reaction. The phase change temperature and latent heat of the DA-HD /fumed silica shaped composite phase change material are 19.20 ℃ and 93.1 J/g respectively. The phase change temperature is within the temperature range of maintaining indoor environmental comfort, and the latent heat of phase change is large and the thermal stability is good, applicable to the field of building energy conservation.
  • Effects of fine aggregate type and steel fiber on the mechanical properties of CA-UHPC
    YU Zhihui, WU Lishan, ZHANG Cong
    Journal of Functional Materials. 2021, 52(12): 12152-12158. https://doi.org/10.3969/j.issn.1001-9731.2021.12.024
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the effects of river sand, quartz sand, machine-made sand as fine aggregate, different length-diameter ratio of steel fiber (13/0.2, 15/0.2, 25/0.3), different steel fiber content (0%, 1.5%, 2%) and steel fiber mixture (13 mm+25 mm) on the mechanical properties of ultra-high performance concrete containing coarse aggregate (CA-UHPC) are studied. The results show that the particle size distribution of fine aggregate has a significant effect on the compressive strength of CA-UHPC, but a small effect on the flexural strength of CA-UHPC, in which the compressive strength and flexural strength of manufactured sand CA-UHPC are the highest. When the content of steel fiber is less than 2%, the compressive strength of CA-UHPC is positively correlated with the content of steel fiber, length-diameter ratio and hybridization. The flexural strength of CA-UHPC increases with the increase of steel fiber content, and increases first and then decreases with the increase of steel fiber aspect ratio. The composite mixing of steel fiber is beneficial to the improvement of flexural strength. In addition, the compressive strength and flexural strength of CA-UHPC decrease when steel fiber is replaced by CaCO3 whisker of equal volume.
  • Flexural properties of high strength high ductility cementitious composite
    WU Lishan, YU Zhihui, YUAN Zhen, ZHANG Cong
    Journal of Functional Materials. 2021, 52(12): 12159-12164. https://doi.org/10.3969/j.issn.1001-9731.2021.12.025
    Abstract ( ) Download PDF ( ) Knowledge map Save
    High strength high ductility cementitious composite (HSHDCC) has attracted extensive attention in the field of seismic reinforcement and repair of building structures due to its excellent mechanical properties such as ultra-high strength and ultra-high ductility. However, the high cost of HSHDCC is one of the bottlenecks of its large-scale engineering application. In this paper, a novel HSHDCC material is prepared by introducing calcium carbonate whisker with high strength, high elastic modulus and low cost. The effects of water-binder ratio and calcium carbonate whisker on the flexural properties of HSHDCC are studied. The results indicate that the flexural strength of HSHDCC decreases with the increase of water-binder ratio, but its ductility improves with the increase of water-binder ratio. The flexural cracks of HSHDCC become saturated gradually with the increase of water-binder ratio. The introduction of calcium carbonate whisker improves the flexural properties of HSHDCC. The calcium carbonate whisker generates more micro-crack sources through the micro-mechanism of whisker pull-out, crack deflection and crack bridging, and improves the stability of crack propagation, thus improving the multiple cracking capacity and flexural deflection hardening behavior of HSHDCC. Therefore, the ductility of designed HSHDCC is significantly improved.
  • Phase angle prediction and viscoelasticity of warm mix rubber modified asphalt mixtures
    ZHANG Fei, WANG Lan, LI Chao, LIU Heng
    Journal of Functional Materials. 2021, 52(12): 12165-12174. https://doi.org/10.3969/j.issn.1001-9731.2021.12.026
    Abstract ( ) Download PDF ( ) Knowledge map Save
    To achieve the prediction of the phase angle from the dynamic modulus test results of the rubber modified asphalt mixture and to evaluate the high and low temperature performance from the linear viscoelastic perspective, by using the results of complex modulus tests, the master curves of dynamic modulus and phase angle are constructed to approximately satisfy the Kramers-Kronig (K-K) relationship, and the master curves of relaxation modulus and creep compliance in the time domain are further obtained according to the viscoelastic principle. The results show that the model prediction of the phase angle is not as good as the dynamic modulus but still shows a high accuracy. Both the Cole-Cole plots and the Black Space plots demonstrate the measured results. And the model predictions are consistent with the linear viscoelastic theory. The results of relaxation modulus and creep compliance show that the rutting resistance of HMA-60 is less than that of HMA-C at high temperature, but the crack resistance is better than that of HMA-C at low temperature. Once the warm mix additive is added, the rutting resistance at high temperature and crack resistance at low temperature are improved. The rutting resistance of WMA-60 is less than that of WMA-C at high temperature, but the crack resistance is better than that of WMA-C at low temperature.
  • Orthogonal experimental study on the mechanical properties of polypropylene-steel fiber/recycled coarse aggregate concrete
    JIN Baohong, ZHENG Chuanlei, HOU Yufei, WANG Jinhao, ZHAO Yadi, LI Shuxiang
    Journal of Functional Materials. 2021, 52(12): 12175-12183. https://doi.org/10.3969/j.issn.1001-9731.2021.12.027
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Based on the L16(45) orthogonal table, 16 groups of polypropylene-steel fiber/recycled coarse aggregate concrete (PP-SF/RCA concrete) and 1 group of reference group concrete are obtained, and the 7-day compressive strength and 28-day compressive, split tensile and bending strength tests are designed. The flexural strength test is to study the influence of the three factors of VP, VS and RR on the mechanical properties of PP-SF/RCA concrete. The results show that the 7-day compressive strength and 28-day compressive, split tensile and bending strengths of PP-SF/RCA concrete are greater than those of the benchmark group, and the largest increases compared to the benchmark group are 41.9%, 23.0%, 59.1% and 28.9%, respectively. The change trend of 7-day compressive strength with VP, VS and RR is similar to that of 28-day compressive strength, but the variance analysis result of 7-day compressive strength is not significant. For 28-day compressive strength, VP and RR are particularly significant factors. For 28-day split tensile strength, VS is significant factors. For 28d bending strength, VS and RR are significant factors. The efficiency coefficient method is used to comprehensively evaluate the 28-day compression, splitting and bending strength test results, and the best mix ratio is 0.04% VP, 2.0% VS, 80% RR. 28d compression, splitting and bending strength prediction model established by the theory of fiber hybrid effect has high accuracy.
  • Effects of nanoparticle/polymer composites on strength and impermeability of cement-based materials
    MEI Junpeng, XU Zhidong, LI Hainan, MA Baoguo, WANG Zhixin, JIANG Tianhua
    Journal of Functional Materials. 2021, 52(12): 12184-12189. https://doi.org/10.3969/j.issn.1001-9731.2021.12.028
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the effects of nano-TiO2 (NT)/styrene-acrylic emulsion (SAE) composites on strength and impermeability of cement-based materials are studied, and the underlying mechanism is analyzed through their influences on the hydration characteristics and microstructures of hardened cement pastes. Results show that mix SAE and NT could significantly improve the early strength degradation and hydration delay caused by mix SAE alone, reduce the total pore volume, and the amount of harmful and much harm pores, refine the pore structure, and increase the hydration degree of cement clinker and the polymerization degree of C-S-H gels, so as to improve the strength and anti-permeability. Such results have some guiding significance for the composite application of nanoparticle/polymer in cement-based materials.
  • Resistivity model of basalt-polypropylene fiber reinforced concrete
    SUN Zhen, NIU Ditao, ZHANG Lu, ZHANG Jian
    Journal of Functional Materials. 2021, 52(12): 12190-12195. https://doi.org/10.3969/j.issn.1001-9731.2021.12.029
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The resistivity of basalt-polypropylene fiber reinforced concrete (BPFRC) is studied by modified two-electrode alternating current method, and the pore structure of BPFRC is analyzed by mercury injection test. The results show that the resistivity of single mixed polypropylene fiber, single mixed basalt fiber, mixed fiber 0.1% and mixed fiber 0.2% increases by 11.3%, 20.5%, 29.4% and -23.0%, respectively, compared with that of concrete without fiber. Compared with C30 concrete, the resistivity of C40 and C50 improves by 18.3% and 44.8% respectively. According to the pore structure analysis, except for hybrid fiber 0.2%, BPFRC has more harmless holes, less harmful holes, and the most pore size is small. With the increase of strength, porosity decreases, harmless pores increase, and harmful pores decrease. The difference of resistivity of BPFRC is analyzed from mechanism. Based on the experimental data in this paper, BPFRC resistivity model is established by considering environmental temperature, humidity, water cement ratio, fiber and other factors.
  • Activityand mechanism of highland barley straw ash added into magnesium oxychloride cement
    CAO Feng, TAN Zhen, QIAO Hongxia, SHU Xiuyuan
    Journal of Functional Materials. 2021, 52(12): 12196-12202. https://doi.org/10.3969/j.issn.1001-9731.2021.12.030
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to study the activity and action mechanism of highland barley straw ash (HBSA) mixed with magnesium oxychloride cement (MOC), the microstructure and particle size distribution of HBSA prepared at different calcination temperature, calcination time and grinding time are tested, and the activity preparation conditions of HBSA are preliminarily determined. The orthogonal test of mechanical properties of MOC under the influence of calcination temperature, calcination time and grinding time is designed, and the relative activity index is used to reflect the activity of HBSA incorporated into MOC. Based on grey entropy correlation analysis, the primary and secondary relationship of influencing factors on HBSA activity is analyzed. Finally, the microstructure of HBSA and the morphology of MOC are analyzed to reveal the mechanism of its activity effect. The results show that the crystallinity and average particle size of HBSA obtained by calcination for 2 h and grinding for 2 h at 600 ℃ are the smallest, the specific surface area is the largest and the activity is the highest. The relative activity index added into MOC is 1.06. Calcination temperature has the greatest influence on the activity of HBSA, followed by grinding time and calcination time. The content of active SiO2 in HBSA is relatively high, which can react with MOC hydration products for two times to generate more water to produce magnesium silicate (M-S-H) gel, enhance the compactness of structure and improve the mechanical properties.
  • Effect ofmetakaolin on frost resistance and mesostructure of ceramsite concrete
    YU Zhouping, YANG Weijun
    Journal of Functional Materials. 2021, 52(12): 12203-12209. https://doi.org/10.3969/j.issn.1001-9731.2021.12.031
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Frost resistance is one of the important indicators of the durability of concrete. In the cold open air environment, the frost resistance of concrete is particularly important. Ceramsite is a kind of porous aggregate with strong permeability. This characteristic affects the frost resistance of ceramsite concrete to a certain extent. In this paper, the effects of metakaolin (MK) and ceramsite size on the freezing resistance and microstructure of ceramsite concrete are studied by freeze-thaw cycle test. The results show that the mass loss and strength loss energy of ceramsite concrete increase with the increase of ceramsite particle size. Metakaolin can improve the frost resistance of ceramsite concrete to a certain extent. When the content of MK is 10%, the effect is better, while when the content of MK exceeds 20%, it is unfavorable to the frost resistance of ceramsite concrete.
  • Performance of high early strength waterborne epoxy resin-emulsified asphalt-cement rapid repair material
    HAO Xiaoyu, TIAN Yaogang, ZHAO Cheng, JIANG Jing, HUANG Xianlong, JI Kuo, QI Lin, JIA Kan
    Journal of Functional Materials. 2021, 52(12): 12210-12215. https://doi.org/10.3969/j.issn.1001-9731.2021.12.032
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In view of the problem that the pit repair materials of asphalt pavement are difficult to repair in rainy season or have poor stability and durability after repair, a rapid repair material, waterborne epoxy resin-emulsified asphalt-cement (EAC), with high early strength and high stability is designed by combining waterborne epoxy resin, cement cementitious materials and emulsified asphalt in this study. The influence of waterborne epoxy resin content on mechanical properties and pavement performance of rapid repair material is investigated. Besides, the micro-structures are tested and analyzed by XRD, SEM and IR tests. Results indicate that the addition of waterborne epoxy resin can slightly reduce the 2 h strength of EAC rapid repair material, but can significantly increase its later strength. The high temperature resistance, low temperature resistance and moisture susceptibility are improved as the content of waterborne epoxy resin increasing in a certain range. The microscopic test results show that waterborne epoxy resin can delay the hydration process of cementitious materials and the crystallization of CH. The compactness of EAC rapid repair material can be improved by introducing an appropriate amount of waterborne epoxy resin.
  • Research on the toughening effect of graphene oxide on concrete composites
    LIU Wenjuan, GU Linran, XIONG Huan, WU Hanmei
    Journal of Functional Materials. 2021, 52(12): 12216-12220. https://doi.org/10.3969/j.issn.1001-9731.2021.12.033
    Abstract ( ) Download PDF ( ) Knowledge map Save
    On the basis of ordinary Portland cement P.O 42.5, polycarboxylic acid water reducer and coarse aggregate are selected, and graphene oxide is used as reinforcement to prepare concrete composites with different content of graphene oxide (0.00, 0.05 wt%, 0.10 wt% and 0.15 wt%). The performance differences of concrete composites with different content of graphene oxide are studied. The results show that with the doping of graphene oxide, the hydration difficulty of concrete decreases, the hydration reaction rate increases, the particles of concrete composites contact more closely, and the doping of graphene oxide does not produce new hydration products. When the content of graphene oxide is 0.10 wt%, the maximum fluidity of the composite is 256 mm, the slump and porosity reach the lowest values, 27 mm and 26.3%, respectively, and the compressive strength and flexural strength reach the maximum values, 44.70 and 7.68 MPa, respectively. Compared with the concrete without graphene oxide, the compressive strength and flexural strength are increased by 6.18% and 6.52%, respectively. The comprehensive analysis shows that the performance is the best when the doping content of graphene oxide is 0.1wt%.
Author Center
Review Center
Journal Online
Copyright © Journal of Functional Materials
Tel: 023－68264739　 　
E-mail: gnclbjb@126.com　
Total visitors:
Visitors of today:
Now online:
渝公网安备50010902000552号　渝ICP备2022001025号-1