| 荷载与环境因素耦合作用下超高性能水泥基复合材料的主要性能(英文) |
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| 引用本文： | Saly Fathy,顾春平,孙伟.荷载与环境因素耦合作用下超高性能水泥基复合材料的主要性能(英文)[J].东南大学学报,2012(2):184-189. |
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| 作者姓名： | Saly Fathy 顾春平 孙伟 |
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| 作者单位： | 东南大学材料科学与工程学院;Department of Civil Engineering,Alexandria University,Alexandria 21532,Egypt |
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| 基金项目： | The Technical Research Program from NV Bekaert SA of Belgium (No. 8612000003);the National Natural Science Foundation of China (No. 50908047) |
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| 摘 要： | 研究了钢纤维掺量和强度等级对超高性能纤维增强水泥基复合材料(UHPFRCC) 宏观性能的影响及UHPFRCC 在荷载与环境因素耦合作用下的耐久性能. 制备了 3 组不同强度等级(100,150,200 MPa) 和不同纤维掺量 (0%,1%,2%,3%) 的高与超高性能水泥基复合材料,并且测试了其各项力学性能和短期耐久性能. 利用设计的预加载装置,在 UHPFRCC150 试件上施加了应力比为 0. 5 的四点弯曲荷载. 结果表明,随着强度等级的增加,在掺加适量钢纤维掺量的情况下,高与超高性能水泥基复合材料的强度和韧性均明显提高,同时其干燥收缩值降低. 对于加载的试件,钢纤维降低了拉应力对 UHPFRCC 抗氯离子渗透性能的不利影响,并且提高了材料的抗冻融性能.
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| 关 键 词： | 超高性能纤维增强水泥基复合材料 荷载与环境耦合作用 力学性能 耐久性 |
Main properties of ultra-high performance fiber reinforced cement composites under couple effect of load and environment |
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| Saly Fathy,Gu Chunping,Sun Wei.Main properties of ultra-high performance fiber reinforced cement composites under couple effect of load and environment[J].Journal of Southeast University(English Edition),2012(2):184-189. |
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| Authors: | Saly Fathy Gu Chunping Sun Wei |
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| Institution: | 1(1 School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)(2Department of Civil Engineering,Alexandria University,Alexandria 21532,Egypt) |
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| Abstract: | This study aims to reveal the mechanism that how the content of steel fibers and strength grades affect the macro performance of the ultra-high performance fiber reinforced cementitious composite(UHPFRCC) and to study the UHPFRCC durability under the combined effect of loads and environments.Three types of high and ultra-high performance fiber reinforced cement composites with different strength grades(100,150,200 MPa) and different steel fiber volume fractions(0%,1%,2%,3%) are prepared.The main properties of mechanical performance and short-term durability are studied.A preloading frame is designed to apply a fourpoint load external flexural stress with a stress selection ratio of 0.5 for UHPFRCC150 specimens.The results show that the growth in strength grade with a proper content of steel fiber greatly increases the strength and toughness of the HPFRCC and the UHPFRCC while decreasing the dry-shrinkage ratio.For the loaded specimens,the existence of steel fiber can reduce the negative influence of tensile stress on the Clpenetration resistance of the UHPFRCC in addition to improving its ability to resist the freeze-thaw damage. |
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| Keywords: | ultra-high performance fiber reinforced cementitious composite couple effect of load and environment mechanical properties durability |
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