飞机除冰液对高性能混凝土抗冻性的影响

采用快冻法测定了高性能混凝土(HPC)在水、浓度为3.5%的NaCl除冰盐和3.5%-25%的乙二醇和商品飞机除冰液中的抗冻性.结果表明,乙二醇对HPC的冻融破坏与飞机除冰液的浓度有非常密切的关系,3.5%乙二醇溶液和3.5%NaCl溶液均对HPC表现出较严重的表面剥蚀,而12.5%-25%乙二醇溶液则能够延缓HPC的冻融破坏.与乙二醇化学试剂相比,浓度为25%的以丙二醇为主要成分的商品飞机除冰液对HPC相对动弹性模量的劣化程度甚至超过3.5%NaCl除冰盐.在冻融条件下,飞机除冰液主要导致HPC的表面剥蚀破坏.

INFLUENCE OF AIRCRAFT DEICER ON FREEZE-THAW DURABILITY OF HIGH PERFORMANCE CONCRETE

The influence of glycol, the main composition of the most frequently used aircraft dicer, on the freeze-thaw durability of high performance concrete (HPC) is investigated. Freeze-thaw durability of HPC is tested by accelerated freeze-thaw test. Four kinds of the solution, i.e., tap water, 3.5% NaCl solution, glycol solutions, and a LBR-A type commercial aircraft deicer are employed. Results show that freeze-thaw durability of HPC exposed to glycol solutions is closely related to the solution concentrations. The failure of HPC exposed to 3.5% glycol solution is similar to that of those exposed to 3.5% NaCl solution, i.e., serious surface scaling. While the damage of HPC exposed to 12.5%-25% glycol solutions is postponed. Compared with glycol solution, the commercial aircraft deicer has much more negative effects on HPC freeze-thaw durability compared with 3.5% NaCl solution. In the presence of commercial aircraft deicer for HPC subjected to freeze-thaw cycles, the deterioration is mainly due to scaling and spalling.