MECHANICS CHARACTERISTICS AND FAILURE CRITERIA OF CONCRETE UNDER TRIAXIAL COMPRESSION AFTER FREEZE-THAW CYCLING
Most buildings at cold (northern) region such as concrete structures and dams are badly effected by freeze-thaw cycling. According to the fact, 0, 25, 50 and 75 cycles of freeze-thaw cycling are made to normal concrete, and triaxial compressive experiments on strength and deformation of normal concrete using the large static-dynamic triaxial test system for concrete in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology. Design stress radios are 0.1：0.25：1、0.1：0.5：1、0.1：0.75：1和0.1：1： 1. The strength and deformation of concrete is measured through normal and real triaxial test respectively, the effect of freeze-thaw cycling and stress ratios on concrete strength and deformation under normal and real triaxial states is analyzed based on experimental results. Study on the experiment indicates that the triaxial compressive strength of concrete is decreased with the increasing of freeze-thaw cycles, and the compressive strength is greater than uniaxial compressive strength because of the effect of stress ratio when concrete endured the same cycles of freeze-thaw cycling. Failure criteria of concrete under triaxial compressive stress after freeze-thaw cycles are established in Octahedral stress space. The study result provides structural assign and analysis foundation for structures at cold (northern) region such as dams、concrete bridges and ect., which work in triaxial compressive stress condition. This study is the first step in the field of mechanical characteristic of concrete under triaxial stress after freeze-thaw cycling.
Likun Qin Yujie Wang Jiawei Yao
Dept.of Civil Engineering, Dalian Nationalities University, Dalian,China Dept.of Civil Eng., Dalian University, Dalian,China
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）