On the mechanism of internal temperature and humidity response of recycled aggregate concrete based on the recycled aggregate porous interface

摘要

In this paper, based on the porosity characteristics of the recycled aggregate (RA) interface, the response rule and response mechanism of temperature and humidity in interior of recycled aggregate concrete (RAC) with 100% replacement ratio were studied at different temperatures, depth and bending load. Moreover, pore structures were measured to analyze the effect of temperature and relative humidity (RH) by mercury intrusion testing. The results indicated that the RAC temperature response rate was lower than NAC, and decreased from the surface. The RH response rate of the RAC was faster than that of the NAC. The effect of the bending load accelerated the response rate of RH and the cooling rate of the RAC surface but hinder the deep cooling rate. The BA partition-interface heat moisture transfer model was proposed for RH hysteresis effect. The response calculation model of temperature and RH of the RAC interior was established.