长江科学院院报2011，Vol.28Issue(10)：171-174,4.
冻融循环过程中混凝土性能的劣化研究
Deterioration of Concrete Properties During Freeze-Thaw Cycles
摘要
Abstract
The deterioration of concrete properties from freeze-thaw actions are studied and the sensibility of various test methods to different deteriorating characteristics is also explored. It is revealed that the flexural strength and splitting tensile strength of concrete deteriorates more rapidly than compressive strength does, which is positively linearly related to mass loss rate and relative dynamic modulus of elasticity. When relative dynamic modulus of elasticity and mass of concrete are reduced respectively by 40% and 5% , the compressive strength is decreased respectively to 19. 3% and 25.5% of the initial value. The sensibility of dynamic mechanical velocity to concrete deterioration during freeze-thaw cycles is between that of concrete strength and ultrasonic velocity. The density of hydration products of cement is decreased due to freeze-thaw actions, giving rise to cracks on the bubble wall and increase of porosities with diameter from 25 nm to 75 nm.关键词
混凝土/冻融循环/劣化/测试/微观结构Key words
concrete/ freeze-thaw cycles/ deterioration/ test/ microscopic structure分类
建筑与水利引用本文复制引用
李家正,周世华,石妍..冻融循环过程中混凝土性能的劣化研究[J].长江科学院院报,2011,28(10):171-174,4.基金项目
国家自然科学基金重点项目(51139001) （51139001）
水利部公益性行业科研专项经费项目(200901066) （200901066）
长江科学院中央级公益科研项目(CKSF2010013) （CKSF2010013）
