THE FROST EVALUATION OF DRIED CONCRETE USING RECYCLED COARSE AGGREGATE BY THE ACCELERATED FREEZE-THAW TEST AND THE CRITICAL DEGREE OF SATURATION TEST

摘要

The accelerated freeze-thaw test and the critical degree of saturation test are widely used as frostresistance methods. However, different evaluation results by the two methods are reported. In thisstudy, a test was conducted to figure out the connection between the two methods. Along with this, theeffects of coarse aggregate, that is the ordinary aggregate (SZ) and the recycled aggregate (RM), aircontent and drying degree on the frost resistance were investigated. According to the results, concreteincluding more air showed a better frost resistance. The frost resistance from the acceleratedfreeze-thaw test was agreed with that from the critical degree of saturation test in nonAE concrete,whereas the frost resistances showed different trends in AE concrete. By comparing the dyed portionsof RM with SZ, the interface of RM is weak and cracks are more easily to emerge on the RM.