| Abstrakt: |
In order to increase the utilization rate of recycled aggregates from construction solid waste, this paper adopts ordinary mixing and vibration mixing processes, and investigates the effect of recycled aggregate substitution rates and mixing time on the mechanical properties of concrete through comparative tests. The results show that: with the increase of the proportion of recycled aggregate, the compressive strength of concrete in different mixing methods are reduced, in which the reduction in ordinary mixing process is more obvious; compared with the ordinary mixing, vibration mixing compressive strength of recycled concrete in the recycled aggregate substitution rate of 0, 20%, 40%, 60%, 80%, 100%, respectively, increased by 10.59%, 7.87%, 9.09%, 4.99%, 5.43%, and 6.1%, respectively. When vibration mixing times were 50 s, the 7 d and 28 d compressive strength of concrete was the highest. The above studies show that vibration mixing can inhibit the decline of mechanical properties of recycled aggregate concrete and save mixing time. [ABSTRACT FROM AUTHOR] |
