引气混凝土在中国盐湖环境中抗冻性的研究

用快冻法研究了普通混凝土与引气混凝土在水和西藏、内蒙古、新疆和青海盐湖卤水中的抗冻性。结果表明，普通混凝土在盐湖卤水中冻融时，引起冻融破坏的主导因素是盐结晶压，混凝土的抗卤水冻蚀性主要取决于盐结晶压的损伤负效应和卤水冰点降低的损伤正效应。引气产生的气孔不仅能释放水冻胀压，而且能更加显著的缓解盐结晶压，引气能否改善抗冻性主要取决于盐湖卤水的种类和成分。

Research on Freezing-thawing Durability of Air-entrained Concrete Exposed to Salt Lakes

Freezing thawing durability of both ordinarily and air entrained concrete exposed to Xinjiang, Qinghai, Inner Mongolia and Xizang salt lakes were determined by the accelerated freezing thawing method. Results show that damage of ordinary concrete subjected to bittern freezing thawing were caused mainly by salt crystallization and that the freezing thawing durability were determined by equilibrium of the beneficial effect of low ice point of bitterns and the disbennifit effect of stress caused by salt crystallization. Pores in air entrained concrete improved the freezing thawing durability in that they can release swelling caused by both freezing and salt crystallization. Whether the freezing thawing durability can be improved by introducing air depends on the type and ingredients of different bitterns.