摘要
采用快冻法测定了高性能混凝土(High Performance Concrete,HPC)在水、浓度为3.5%的NaCl除冰盐、3.5%～25%的醋酸钙镁(Calcium magnesium acetate,CMA,机场道面除冰液)、25%的乙二醇(飞机除冰液)和商品飞机除冰液中的抗冻性。结果表明,在3.5%CMA溶液中,HPC抗冻性比水中冻融提高了1.09倍,其冻融破坏特征与水中冻融一样,均属于内部微裂纹扩展,完全不同于HPC在3.5%NaCl溶液中的盐冻表面剥蚀。在浓度为25%的条件下,CMA机场道面除冰液对HPC无冻融破坏作用,而乙二醇飞机除冰液、尤其是商品飞机除冰液对HPC有明显的冻融破坏作用。因此,CMA机场道面除冰液能够有效地延缓HPC的冻融破坏。
Influence of calcium magnesium acetate （ CMA）, which is the main composition of the most frequently used as airfield pavement dicer, on the freezing-thaw durability of high performance concrete （HPG） were investigated. Freeze-thaw durability of HPC was tested by accelerated freezing-thawing test. Five kinds of solutions, namely tap water, 3.5 % NaCl solution, 3.5 % -25 % calcium magnesium acetate （CMA）, 25% glycol solution and commercial aircraft deicer were employed to be the freeze-thaw mediums. Results show that freeze-thaw durability of HPC exposed to CMA solutions is related to the solution concentrations. CMA solution with a concentration of 3.5% is beneficial to durability of HPC. Freeze-thaw failure of concrete exposed to 3.5% CMA solution is 1.09 of that of HPC exposed to tap water; both are resulted from propagation of inner cracks. While freeze-thaw failure of HPC exposed to NaC1 solution is different and characterized by surface deterioration. 25% CMA solution shows no damage to HPC freeze-thaw durability, while both 25% glycol solution and commercial aircraft deicer demonstrate obviously damage to HPC freeze-thaw durability. The results showed that CMA can effectively improve the freeze-thaw durability of HPC.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第4期860-864,879,共6页
Bulletin of the Chinese Ceramic Society
基金
国家重点基础研究发展计划(973计划)(2009CB623203)
中国博士后基金项目(20070421036)
江苏省自然科学基金重点项目(BK2005216)
关键词
高性能混凝土
机场道面除冰液
抗冻性
动弹性模量
冻融循环
high performance concrete
airfield pavement deicer
freeze-thaw durability
dynamic modulus of elasticity
freeze-thaw cycles
