钢纤维-聚丙烯纤维混杂对再生混凝土抗冲击性能的影响  

Effect of steel fiber-polypropylene fiber hybrid additon on impact resistance of recycled aggregate concrete

作　　者：孔祥清[1] 何文昌 邢丽丽 王学志[1] KONG Xiangqing;HE Wenchang;XING Lili;WANG Xuezhi(Department of Civil&Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,锦州121001

出　　处：《复合材料学报》2020年第7期1763-1773,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51479168);辽宁省自然科学基金(SY2016001);辽宁省"兴辽英才计划"项目(XLYC1807044)。

摘　　要：为研究钢纤维(SF)与聚丙烯纤维(PPF)混杂后对再生混凝土(RAC)抗冲击性能的影响,采用落锤弯曲冲击试验装置对素RAC、SF/RAC、PPF/RAC和SF-PPF/RAC进行抗冲击试验;分析了不同纤维掺量和掺入方式对RAC抗冲击性能的影响;采用数理统计模型对冲击试验结果进行拟合和失效概率预测,并对SF-PPF/RAC抗冲击性能的阻裂增强机制进行深入分析。结果表明:单掺或混杂纤维均可提高RAC的抗冲击性能;其中混合掺入体积分数为1.5vol%的SF和体积分数为0.9vol%的PPF时,RAC抗冲击耗能的提高幅度最大,RAC基体的延性和韧性最佳。SF-PPF/RAC的抗冲击次数很好地服从两参数Weibull分布。SF与PPF混杂对改善RAC的抗冲击性能呈现出优异的混杂增强效应。In order to investigate the effect of hybrid steel fibe(SF)and polypropylene fiber(PPF)on the impact resistance of the recycled aggregate concrete(RAC),the flexural impact resistances of plain RAC,SF/RAC,PPF/RAC and SF-PPF/RAC were studied by drop weight impact test.The effects of fiber content and the way of incorporation on the impact resistance of RAC were analyzed.The mathematical statistical model was used to fit the impact experimental results and predict the failure probability.The crack resistance enhancement mechanism of SF-PPF/RAC was further analyzed.The results indicate that both single fibers and hybrid fibers can improve the impact performance of RAC.The specimen with the hybrid volume fraction of 1.5 vol%SF and volume fraction of 0.9 vol%PPF is found to have the maximum increase in impact energy consumption and the best ductility and toughness in concrete matrix.The impact resistance numbers of SF-PPF/RAC are well subordinated to the two-parameter Weibull distribution.The SF-PPF exhibit significant hybrid effect on improving the impact resistance of RAC.

关 键 词：混杂纤维 再生混凝土 抗冲击性能 WEIBULL分布 阻裂增强机制 

分 类 号：TU528.572[建筑科学—建筑技术科学]