Study on evaluation method of recycled fine aggregate quality of waste concrete based on residual cement paste content
Aiming at the problem that recycled fine aggregate resource of waste concrete is difficult to be used efficiently due to its complex attribute and great difference in basic performance,this paper proposes a method to classify and evaluate recycled fine aggregate based on its residual cement paste content.The basic performance of recycled fine aggregate in Beijing,Hefei,Tongcheng,Guangzhou,Chengdu and Chongqing was tested.Based on the residual cement paste content ɑRCC of recycled fine aggregate,the recycled fine aggregate was divided into three grades,namely,Class Ⅰ,Class Ⅱ and Class m,by comprehensive utilization of the apparent density,crushing index,water demand ratio and strength ratio of recycled mortar,and compared with the current specifications.The results show that the recycled fine aggregate can be classified according to its residual cement paste content ɑRCC≤15％,15％＜ɑRCC≤25％,ɑRCC＞25％,respectively,and its corresponding basic performance indexes meet the requirements of current specifications.The recycled fine aggregate can be classified and eval-uated more simply and precisely based on the residual cement paste content.This classification meth-od is conducive to the differential and efficient utilization of recycled fine aggregate.
waste concreterecycled fine aggregateresidual cement paste contentclassificationeval-uation method
万方数据
维普
