HFRC冲击性能试验研究  

Experimental study on HFRC impact performance

作　　者：夏冬桃 朱峰 付敏 代聪 XIA Dongtao;ZHU Feng;FU Min;DAI Cong(College of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《混凝土》2020年第11期31-35,共5页Concrete

基　　金：国家自然科学基金(51108164)。

摘　　要：为了研究钢-聚丙烯混杂纤维混凝土(HFRC)的抗冲击性能,采用改装的落锤冲击试验装置,对36块直径150 mm,厚度63 mm的圆饼形试件进行了冲击试验,对比分析了HFRC的冲击破坏形态、钢纤维特征值对HFRC冲击性能的影响以及钢纤维和聚丙烯纤维混杂后对混凝土的抗冲击性能的影响和增强机理。同时,基于Weibull分布理论对不同特征值的HFRC初裂冲击次数和终裂冲击次数进行了概率统计分析。结果表明:纤维掺量从0.8%增加到1.2%能提高纤维混凝土抗冲击性能,超短微丝钢纤维对HFRC抗冲击性能的提高优于多锚点钢纤维,超短微丝钢纤维体积掺量为1.2%和聚丙烯纤维体积掺量为0.11%的HFRC试件表现出最优的冲击性能,两参数Weibull分布能较好的描述HFRC抗冲击次数的分布规律。In order to investigate the impact resistance of steel-polypropylene hybrid fiber concrete,a modified drop weight impact test device was used to test the impact test of 36 round cakes with a diameter of 150 mm and a thickness of 63 mm.The impact damage morphology,steel fiber characteristic value on the impact properties of hybrid fiber concrete and the impact and reinforcement mechanism of steel fiber and polypropylene fiber on the impact resistance of concrete.At the same time,based on the Weibull distribution theory,the probability and statistical analysis of the number of initial cracking times and the number of final crackings of hybrid fiber concrete with different eigenvalues were carried out.The results show that the increase of fiber content from 0.8%to 1.2%can improve the impact resistance of fiber concrete.The impact resistance of ultra-short steel fiber on fiber concrete is better than that of multi-anchor steel fiber.Hybrid fiber concrete specimens with ultra-short steel fiber volume of 1.2%and polypropylene fiber volume of 0.11%exhibited the best impact performance.The two-parameter Weibull distribution can better describe the distribution of the impact resistance of hybrid fiber concrete.

关 键 词：混杂纤维 落锤冲击 初裂冲击次数 终裂冲击次数 WEIBULL分布 

分 类 号：TU528.572[建筑科学—建筑技术科学]