为探究改性碳纳米管对混杂纤维自密实混凝土弯曲韧性的影响,通过分析不同纤维掺量下混杂纤维混凝土的劈裂抗拉强度试验和压弯强度试验,研究其荷载-挠度曲线,分析等效抗弯强度值和弯曲韧性比.结果表明:两种纤维分别在宏观和微观尺度上发挥着不同的阻裂效果,共同提升自密实混凝土的劈裂抗拉强度,同时也提高了混凝土的初始弯曲韧性比和初始等效抗弯强度,使混掺纤维自密实混凝土的初始弯曲韧性比增加了23.1%;在自密实混凝土试件三分点加载试验中,钢纤维掺量为1.8%,碳纳米管掺量为0.3%时,混凝土峰值荷载最高,达 34 840.2 N.
Experimental study on the bending toughness of mixed fibers from self-compacting concrete
In order to explore the influence of modified carbon nanotubes on the bending toughness of mixed fibers from self-compact-ing concrete,it analyzes the split tensile strength test and bending strength test of concrete under different fiber doping,it studies the load-deflection curve,and analyzes the equivalent bending strength value and bending toughness ratio.The results show that the two fibers exert different crack resistance effects on the macro and micro scales,which jointly improve the split tensile strength of the self-compacting concrete,and also improve the initial bending toughness ratio and the initial equivalent bending strength of the concrete,which increases the initial bending toughness ratio of the mixed fibers from the self-compacting concrete by 23.1%.In the three-point loading test of self-compacting concrete specimens,the steel fiber dosage was 1.8%,and the carbon nanotube dosage was 0.3%,and the peak load of con-crete was the highest,reaching 34 840.2 N.
万方数据
