Effect of recycled times on material properties of recycled aggregate

摘要

The recycling of coarse aggregate can be considered as a method for reducing the amount of concrete fragments that are disposed after the demolition of concrete structures. The objective of this study is to investigate experimentally the effects that recycled times have on the material properties of recycled coarse aggregate. The test results clearly indicated that the percentage of mortar in recycled coarse aggregate increases in relation to the number of recycled times and repeatedly recycling coarse aggregate gradually turns it into the condition of mortar. It was shown that the decrease in specific gravity and the increase in percentage of water absorption have a tendency to level off after some time to form a coarse mortar aggregate made from mortar fragments. In this limited study, the relationship equations between the number of times that coarse aggregate is recycled and its specific gravity as well as its percentage of water absorption was also studied.