轻质超高性能混凝土徐变性能与模型研究  

Research on creep behavior and modeling of lightweight ultra-high performance concrete

作　　者：卢志芳 姜洲 刘沐宇[1] LU Zhifang;JIANG Zhou;LIU Muyu(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2023年第11期128-133,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：湖北省技术创新重大专项资助项目(2018AAA-001-04)。

摘　　要：为研究钢纤维体积掺量和加载龄期对轻质超高性能混凝土(LUHPC)徐变性能的影响,设计制作了钢纤维体积掺量分别为2.0%,2.5%和3.0%的LUHPC棱柱体试件,开展了7和28 d龄期的徐变试验.得到了钢纤维体积掺量和加载龄期对LUHPC徐变性能的影响规律,并得到了LUHPC徐变系数,同时建立了LUHPC徐变模型.研究结果表明:当纤维掺量为2.0%~3.0%时,LUHPC的徐变系数变化范围为0.6~0.9;与国内外规范混凝土徐变模型相比,LUHPC徐变模型计算值与试验值符合较好,计算平均误差为6.4%.研究结果可为LUHPC材料在桥梁工程中的应用提供试验与理论依据.To study the influence of steel fiber volume content and loading age on the creep behavior of lightweight ultra-high performance concrete(LUHPC),LUHPC prismatic specimens with steel fiber volume content of 2.0%,2.5%and 3.0%were designed and made,and creep tests were carried out at age of 7 and 28 d.The influence of steel fiber volume content and loading age on the creep behavior of LUHPC was obtained,the creep coefficient of LUHPC was obtained,and meanwhile the creep model of LUHPC was established.Research results show that the creep coefficient of LUHPC varies from 0.6 to 0.9 when the fiber content is 2.0%to 3.0%,and compared with the standard concrete creep models at home and abroad,the calculated values of the LUHPC creep model are in good agreement with the experimental values with the calculation average error of 6.4%,which could provide experimental and theoretical basis for the application of LUHPC materials in bridge engineering.

关 键 词：轻质超高性能混凝土 加载龄期 钢纤维体积掺量 徐变模型 收缩 

分 类 号：TU528[建筑科学—建筑技术科学]