钢纤维活性粉末混凝土构件的抗裂性能分析  

Analysis on anti-cracking ability of reactive powder concrete members of steel fiber

作　　者：刘超 李月霞 LIU Chao;LI Yuexia(College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,Guangxi,China;Nanning College of Technology,Guilin 541006,Guangxi,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]南宁理工学院,广西桂林541006

出　　处：《工程建设》2021年第9期7-12,共6页Engineering Construction

基　　金：广西高校中青年教师科研基础能力提升项目(2021KY1668)。

摘　　要：本文采用立方体黏结劈拉试验和混凝土构件在对称集中荷载作用的抗剪试验,探讨不同钢纤维掺量对混凝土构件的抗裂性能的影响。试验结果表明:随着钢纤维掺量的增加,活性粉末混凝土劈裂抗拉强度有不同程度的增加;在斜截面抗剪试验过程中,构件混凝土开裂时间推迟,最大裂缝宽度减小,裂缝发展变缓。这说明,活性粉末混凝土中的钢纤维有阻裂抗裂作用,增加钢纤维掺量将增大黏结劈裂强度,提高界面粗糙度和机械咬合力。The cube bonding splitting test and the shearing test of concrete members under symmetric concentrated loads are used to explore the influence of different steel fiber content on the anti-cracking ability of concrete members.The results show that, with the increase of high steel fiber content, the splitting tensile strength of reactive powder concrete is increased to different extent.During the oblique section shear test, the cracking time of the component concrete is delayed, the maximum crack width is reduced, and the crack development is slowed down.It shows that steel fiber in reactive powder concrete can prevent crack expand, while increasing the dosage of steel fiber can make bond splitting strength, and improve the interface roughness and mechanical bite.

关 键 词：活性粉末混凝土 钢纤维 抗裂性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]