不同冻融循环后混凝土损伤特性的研究

Study on concrete damage characteristics under different freeze-cycle

对混凝土不同冻融循环次数后的相对动弹性模量做了具体分析,并且对试件从外及里各部分进行了毛细吸水试验,结果表明:引气混凝土经过300次冻融循环后仍保持良好的抗冻性;未掺和掺加引气剂的混凝土试件经不同冻融循环后外部毛细吸收系数A值均大于其内部的毛细吸收系数,试件内外损伤程度不同。

The relative dynamic elastic modulus after different freeze-thaw cycles was studied specifically ,and capillary absorption tests for all specimens from external to internal were carried out. Results show that concrete with addition of air-entraining agent has better frost resistance after 300 freeze-thaw cycles. For the concrete test specimens without addition of air-entraining agent after different freeze-thaw cycles, the external capillary absorption coefficient is all higher than the internal capillary absorption coefficient, and internal and external damage of the specimen is different.