混杂纤维自密实混凝土弯曲韧性试验研究  

Experimental study on the bending toughness of mixed fibers from self-compacting concrete

作　　者：孙敏[1] 高鹏真 万崔星 方有珍[1] SUN Min;GAO Pengzhen;WAN Cuixing;FANG Youzhen(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Suzhou No.2 Construction Group Co.,Ltd,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]苏州二建建筑集团有限公司,江苏苏州215011

出　　处：《混凝土》2024年第3期78-81,86,共5页Concrete

基　　金：国家自然科学基金(52178149)。

摘　　要：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34840.2 N。In order to explore the influence of modified carbon nanotubes on the bending toughness of mixed fibers from self-compacting 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 concrete was the highest,reaching 34840.2 N.

关 键 词：钢纤维 改性碳纳米管 劈裂抗拉强度 弯曲韧性 

分 类 号：TU528.572[建筑科学—建筑技术科学]