[1127] THE FROST EVALUATION OF DRIED CONCRETE USING RECYCLED COARSE AGGREGATE BY THE ACCELERATED FREEZE-THAW TEST AND THE CRITICAL DEGREE OF SATURATION TEST
キーワード：recycled aggregate, drying degree, frost resistance, accelerated freeze-thaw test, critical degree of saturation test, 再生骨材, 乾燥度, 耐凍害性, 促進凍結融解試験, 限界飽水度試験
The accelerated freeze-thaw test and the critical degree of saturation test are widely used as frost resistance methods. However, different evaluation results by the two methods are reported. In this study, a test was conducted to figure out the connection between the two methods. Along with this, the effects of coarse aggregate, that is the ordinary aggregate (SZ) and the recycled aggregate (RM), air content and drying degree on the frost resistance were investigated. According to the results, concrete including more air showed a better frost resistance. The frost resistance from the accelerated freeze-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 portions of RM with SZ, the interface of RM is weak and cracks are more easily to emerge on the RM.