延性纤维增强混凝土单轴拉伸性能试验研究  

Experimental study of uniaxial tensile properties of ductile fiber reinforced concrete

作　　者：寇佳亮[1,2] 邓明科[1] 梁兴文[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安理工大学土木建筑工程学院,西安710048

出　　处：《建筑结构》2013年第1期59-64,共6页Building Structure

基　　金：国家自然科学基金资助项目(50908187,51078305);陕西省重点学科建设专项资金资助项目(E01001,E01003);陕西省自然科学青年基金资助项目(2009JQ7013);西安建筑科技大学基础研究基金资助项目(JC0902);长江学者和创新团队发展计划资助项目;西安理工大学博士启动资金(118-211206)

摘　　要：选用5种不同的PVA纤维配制延性纤维增强混凝土,对其进行单轴拉伸性能试验,测得材料的立方体抗压强度、密度和拉伸应力-应变全曲线。通过试验对比分析发现,掺加不同PVA纤维的延性纤维增强混凝土的拉伸应力-应变曲线均具有一定的应变硬化特性;不同PVA纤维性能对初裂应力-应变、峰值应力-应变、极限拉应变和抗压强度都有明显的影响;同一种纤维配制的延性纤维增强混凝土随着水胶比增大,其立方体抗压强度均有明显降低,并且密度降低;水胶比对延性纤维增强混凝土的立方体抗压强度、应力-应变影响较大,在满足抗拉强度和韧性的前提下应采用较低的水胶比,这也有助于提高纤维的分散性,但同时较低的水胶比将使其和易性变差。The uniaxial tensile properties of ductile fiber reinforced concrete compounded with 5 various PVA fibers were tested.The cube compressive strength,density and the uniaxial tensile complete stress-strain curve were obtained.Tests of uniaxial tensile properties show that the curves of partial ductile fiber reinforced concrete have strain-hardening properties.Various PVA fibers properties have significant influence on initial cracking stress-strain,peak stress-strain,ultimate tensile strain and cube compressive strength.When the water-cement ratio of ductile fiber reinforced concrete with the same fiber increases,the cube compressive strength and density decrease.The water-cement ratio of ductile fiber reinforced concrete also has great effect on the stress-strain and cube compressive strength.The lower water-cement ratio,if the good tensile strength and toughness can be met,can help to improve the dispersion of fibers,and make it worse workability.

关 键 词：延性纤维增强混凝土 聚乙烯醇纤维 单轴拉伸性能 应力-应变曲线 应变硬化 

分 类 号：TU528.58[建筑科学—建筑技术科学]