NaCl除冰盐作用下混凝土的抗冻能力分析

Salt freezing resistance of concrete subjected to the NaCl deicing salt

通过在质量浓度为3.5%的NaCl溶液中的冻融循环试验,测试了普通混凝土、引气混凝土、粉煤灰混凝土和硅灰混凝土的相对动弹性模量和质量损失率,分析了不同混凝土的抗盐冻的能力。结果表明:适当的引气能够明显改善混凝土的抗盐冻性能,掺加20%粉煤灰时,混凝土仍具有较高的抗盐冻能力,掺量达到40%时混凝土的抗盐冻性能明显下降,掺加10%硅灰明显提高混凝土的抗盐冻能力。

The various situation of salt freezing resistance of ordinary Portland cement concrete （OPC）, air-entrained Portland cement concrete, fly ash concrete and silica fume concrete specimens subjected to the action of 3.5%（in mass） sodium chloride（NaCl） solution were studied by the accelerated freezing method.The relative dynamic elastic modulus and mass loss of concretes are measured.The results show that the proper en- trained air in concrete can enhance the salt-freezing-resistance ability.The salt-freezing-resistance performances of concrete containing the concrete with 20% fly ash are good,but when the dosage of fly ash is 40% ,that of concrete obviously decrease.The concrete with 10% silica fume has good salt freezing resistance ability.