摘要
为了研究混杂复合纤维对高性能混凝土断裂性能的影响,采用切口梁,对11种配合比的单掺及混掺纤维高性能混凝土进行断裂试验。以比例极限强度、峰值强度、断裂能为评判指标,对其断裂性能、混杂效应进行了研究。结果表明:CTF纤维和PF单掺纤维混凝土断裂试验呈现出脆性破坏;试验中CTF,PF纤维断裂试验的最佳掺量分别为1.2,1.0 kg/m^3;基于双掺纤维(CTF+PF)混凝土试验结果,分析得到了试验中双掺的最佳配比,同时通过计算得到对应于fl,fu和GF的混杂效应系数分别为1.146,1.117,1.247,呈混杂正效应。
In order to study the effect of hybrid fiber on fracture properties of high performance concrete,the notched beam fracture tests on high performance concrete reinforced by single and hybrid fiber in 11 varieties of proportioning were conducted.The fracture property and hybrid effect thereof were studied with the evaluation index of proportional ultimate strength,peak strength and fracture energy.The result shows that,the fracture test on single CTF fiber or PF fiber reinforced concrete presents brittle failure,wherein the optimal content of CTF and PF fiber is 1.2 kg/m^3 and 1.0 kg/m^3 respectively;for dual fiber(CTF+PF)reinforced concrete,the test finds out the optimal proportioning and,through calculation,the hybrid effect coefficient corresponding to fl,fu and GF is 1.146,1.117,1.247 respectively,presenting positive hybrid effect.
作者
王志杰
李瑞尧
徐君祥
徐成
朱敢平
史瑞瑾
WANG Zhijie;LI Ruiyao;XU Junxiang;XU Cheng;ZHU Ganping;SHI Ruijin(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Tianjin Rail Transit Co.,Ltd.,Tianjin 300380,China;Favored 9th New Materials Technology(Shanghai)Co.,Ltd.,Shanghai 200062,China)
出处
《路基工程》
2020年第3期81-85,共5页
Subgrade Engineering
基金
天津市科技计划项目(16YFZCSF00610)
教育部创新团队发展计划(IRT0955)。
关键词
混杂纤维混凝土
复合纤维
切口梁试验
断裂性能
混杂效应
hybrid fiber reinforced concrete(HFRC)
composite fiber
notched beam test
fracture property
hybrid effect
