高延性水泥基复合材料的断裂性能分析.pdfVIP

中图分类：TQl72文献标识码．D ．文章编 ：1007-0389(2014)05一l枷4 余保英，向佳瑜，杨 龙，张潇啸(中建商品混凝土有限公司，湖北武汉430000) 摘要：实验测试了不同纤维掺量下的高延性水泥基复合材料的栽荷一挠度曲线，并对试件加载过程中的声发射信号进行收 集，分析了试件断裂后的裂纹分布及纤维在基材中的破坏形式。结果发现：(1)当纤维体积掺量2．0％时，水泥基材的极限挠 积累过程，试件从加载至完全破坏的时间为素水泥基复合材料破坏持续时间的2—5倍；(3)高延性水泥基复合材料中纤维的破 坏以纤维被拔出和纤维被拉断两种模式，试件表现出明显的多缝开裂特征。 关键词：高延性水泥基复合材料、载荷一挠度曲线、声发射、断裂性能 ofthefracture of cementitious ductility Analysis propertieshigh composites ConstructionMixed Hubei Yu Concrete 430000) Baoying，XiangJiayu，Yanglong(China Ready CO．，LTD，Wuhan Abstract：Testedthe with load-deflectioncurvesof cement-basedmaterialsdifferentcontentof highductility composite fiber,and theacousticemissionin failure in collected signalloading thecrackdistributionandfiber modesthebroken process，analysed samples． as Theresultsshow thefibervolumerateisover ultimatedeflectionandflexural ofthece- follows：(1)when 20％，the capacity ment—based Canreach20．16mmand failure cement-basedWas caused composite 19．47MPa；(2)theofhighductility compositemainly theaccumulationofcracks and thetimefrom to Was2-5times by process damaging，as loadingcompletedestroy emer画ng，expanding ofthatof cement-based offiberin cement-basedhastwokindsof pure compositematerial；(3)thedestroy hilghductility composite mede-一oneis”be andtheotheris”bebroken”．theshows pulled”out samplemultiplecrackingobviously． cement-based Keywords：Hishductility curve；acousticemission；fracture