【作者】 李妍； 刁波； 杨松霖； 张笑； 张茜；

【Author】 LI Yan,DIAO Bo,YANG Songlin,ZHANG Xiao,ZHANG Qian (Department of Civil Engineering,Beihang University,Beijing 100191,China)

【机构】 北京航空航天大学土木工程系；

【摘要】 研究了纤维体积率(1%—3%)对不同类型的异形(波浪形、哑铃形、端弯形)钢纤维增强下的超高性能混凝土的力学性能的影响规律。结果表明,在低体积率下(小于2.5%)随钢纤维体积率的提高,三种异型钢纤维增强超高性能混凝土的抗压强度、初裂强度、极限抗弯强度、抗弯韧性、混凝土破坏方式均成向好趋势。而在2.5%—3%的高纤维体积率下,除端弯形和哑铃形纤维混凝土的抗压强度及哑铃形纤维混凝土的抗弯性能在2.5%的纤维体积率处达到峰值,三种异形钢纤维的其他上述各项力学性能均在3%的体积率处最佳。并从机理上分析了导致异形钢纤维的体积率对超高性能混凝土增强增韧效果的差异的原因。更多还原

【Abstract】 A system research was carried on the law of different fiber volume fraction of deformed steel fibers (wave-shaped,dumbbell-shaped,hooked) how to influence on the ultra-high performance mechanical properties. The results showed that with the increase of lower fiber fraction volume(less than 2.5%),three kinds of deformed steel fiber reinforced ultra-high performance concrete the compressive strength,initial cracking strength,ultimate flexural strength,flexural toughness,concrete failure modes are well into the trend.2.5%—3%in the high fiber volume fraction,the compressive strength of the hooked and dumbbell-shaped fiber reinforced concrete,as well as the flexural properties of the dumbbell-shaped fiber reinforced concrete reached its peak at 2.5%of the fiber volume fraction.And to the other Above-mentioned mechanical properties of three kinds of deformed steel fiber reinforced concrete,3%of the fiber volume fraction were the optimal decision.Furthermore,Analyzed the mechanism leading to the fiber volume fraction of deformed steel fiber concrete reinforcing and toughening effect of the difference.更多还原