摘要
通过对饱水状态下的多组混凝土试样进行冻融循环试验,对经历不同冻融循环后的试样进行了单轴压缩强度测定,从损伤和能量耗散的角度对试样进行了力学性能的分析;并运用CT细观试验的方法初步对经历不同冻融循环次数下的试样进行了细观结构分析。通过试验研究,得到了饱水状态下混凝土材料的冻融破坏特征及不同冻融循环次数下试样质量、单轴应力-应变全过程曲线、抗压强度、能量耗散和细观结构变化特征,系统研究了冻融循环下混凝土主要物理力学性能及损伤演化规律,为寒区重大工程冻融灾变预测提供了较可靠的基础依据。
In cold regions of west China,freeze-thaw environment is one of the main factors for leading to the damage of concrete. The freeze-thaw cycling experiment was conducted on concrete under water-saturated conditions,the uniaxial compression experiments were carried out on different freeze-thaw cycles,and the mechanical properties of concrete specimen was systematically analyzed from the perspective of damage and energy dissipation. After freeze-thaw test,the meso-structures of the concrete specimens were preliminary researched by CT meso-test method. Then the failure forms of the specimens under water-saturated and the changes of the mass,the complete stress-strain curves,uniaxial compressive strengths,energy dissipation and the variation characteristics of meso-structures of the concrete specimens after different freeze-thaw cycles were obtained. The main physic-mechanical properties and fracture law of concrete weres explained under freeze-thaw environment. The results can provide the theory basis for major engineering freeze-thaw catastrophe prediction and prevention research in the cold region.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2015年第4期38-44,共7页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(51009010
51379015)
中央高校基本科研业务费专项资金资助项目(CHD2012ZD014)
中国博士后科学基金资助项目(2012M521727)
陕西省博士后科学基金资助项目(110413)
陕西省自然科学基础研究计划资助项目(2015JM5160)
关键词
混凝土
冻融循环
力学损伤劣化
能量耗散
concrete
freeze-thaw（F-T） cycles
mechanical damage degradation
energy dissipation
