混杂纤维混凝土抗弯性能及混杂效应试验研究  

Hybrid fiber reinforced concrete flexural behavior and hybrid effects

作　　者：梅国栋[1] 李继祥[2] 刘肖凡[2] 段文付 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]武汉工业学院结构与新材料研究所,湖北武汉430023 [3]武汉光谷建设投资有限公司,湖北武汉430205

出　　处：《混凝土》2013年第2期21-24,共4页Concrete

基　　金：国家自然科学基金项目(50908182);湖北省优秀中青年科技创新团队计划(T201107);武汉大学博士自主科研基金项目(201121002020002)

摘　　要：按照钢纤维0、0.5%、1%、1.5%的体积掺量和聚丙烯纤维0.1%、0.2%、0.3%的体积掺量制作混杂纤维混凝土试件,进行四水平全面对比弯拉试验,以研究不同纤维类型和掺量对于混凝土弯拉强度的影响,并分析纤维的混杂效应。当体积掺量为钢纤维1.0%、聚丙烯纤维0.2%,弯拉强度提高了32.2%;当体积掺量为钢纤维1.0%聚丙烯纤维0.1%,弯拉强度提高了31.7%。混杂效应分析表明,存在正混杂效应和负混杂效应,当体积掺量为钢纤维0.5%、聚丙烯纤维0.1%,取得最优正混杂效应;最大负混杂效应则出现在总纤维掺量最大的试验组。4 volume ratios of steel fiber （ 0, 0.5%, 1%, 1.5% ） and polypropylene fiber （ 0. 1%, 0.2%, 0.3 % ） were adopted to pouting hy-brid fiber reinforced concrete specimens.Bending tests were conducted to study the effects of volume ratio and types of fibers reinforced on concrete matrix, and the hybrid effects of fibers were analyzed.Flexural-tensile strength was improved 32.2% when the volume ratio was 1.0% for steel fiber and 0.2% for polypropylene fiber, the number of percent improvement was 31.7% when the volume ratio was 1.0% for steel fiber and 0.2% for polypropylene fiber.The results of test manifested that there were positive effects or negative effects in hybrid fiber reinforced concrete,most positive effects was detected for the specimen with 0.5% steel fiber and 0.l% polypropylene fiber in volume ratio, while the most negative effects related to the specimen with highest fiber volume ratio.

关 键 词：钢纤维 混杂纤维 纤维混凝土 弯拉强度 混杂效应 

分 类 号：TU528.01[建筑科学—建筑技术科学]