钢-聚丙烯混杂纤维混凝土冻融损伤试验研究  

Experimental research on freeze-thaw damage of steel-polypropylene hybrid fiber reinforced concrete

作　　者：夏冬桃 李天云 李欣怡 徐乐 任康宁 XIA Dongtao;LI Tianyun;LI Xinyi;XU Le;REN Kangning(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;Hubei Province Transportation Investment Group Co.,Ltd.,Wuhan 430074,China;Wuhan Construction Engineering(GROUP)Co.,Ltd.,Wuhan 430073,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 [2]湖北交通投资集团有限公司,湖北武汉430074 [3]武汉建工集团股份有限公司,湖北武汉430073

出　　处：《混凝土》2024年第3期136-139,共4页Concrete

摘　　要：为研究混杂纤维对高性能混凝土抗冻性能的改善效果,对普通素混凝土、钢纤维混凝土、聚丙烯纤维混凝土和钢-聚丙烯混杂纤维混凝土开展快速冻融循环试验,对冻融作用下试样的各项强度指标进行了检测,并对其质量损失率及相对动弹性模量的变化规律进行了分析。研究结果表明:掺加纤维有利于改善高性能混凝土的抗冻性能,钢-聚丙烯混杂纤维混凝土的抗冻性能最好,经过200次冻融循环,其质量损失率,相对动弹性模量损失率和强度损失均最低;基于三次多项式建立的纤维混凝土冻融损伤模型比基于指数函数建立的纤维混凝土冻融损伤模型精确度更高,在描述纤维混凝土的冻融损伤程度上适用性较强。To study the effect of hybrid fiber on the frost resistance of high performance concrete,the quick freeze-thaw cycle tests were carried out on plain concrete,steel fiber concrete,polypropylene fiber concrete and steel-polypropylene hybrid fiber reinforced concrete.The strength indexes of the specimens were tested under freeze-thaw action and the variation laws of mass loss rate and relative dynamic elastic modulus were analyzed.The results show that the addition of fiber is beneficial to improve the frost resistance of high performance concrete,and the steel-polypropylene hybrid fiber reinforced concrete has the best frost resistance.After 200 times freeze-thaw cycles,the loss rate of mass,the relative dynamic elastic modulus loss rate and the strength loss of steel-polypropylene hybrid fiber reinforced concrete were all the lowest.The freeze-thaw damage model of fiber reinforced concrete based on three degree polynomial is more accurate than that based on exponential functionand it has good applicability in describing the degree of freeze-thaw damage of fiber reinforced concrete.

关 键 词：混杂纤维混凝土 冻融损伤机理 损伤变量 冻融损伤模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]