Effect of recycled ceramic aggregate on hydration heat and permeability of high performance concrete
Fengming Xu, Xiaoshan Lin, Annan Zhou
Abstract
The application of recycled ceramic aggregate (RCA) in concrete construction has attracted increasing attention recently. In this study, the effect of RCA on the exothermic reaction in HPC is investigated, which reveals the mechanism underlying the role RCA plays in regulating hydration heat output and permeability of HPC for the first time. The porosities and the pore distributions of three types of RCA are investigated through microscopic test, and the internal structures of HPC with different types of RCA are also analysed. Hydration heat test is then carried out to measure the maximum temperature obtained during exothermic process and the time at peak temperature. Finally, chloride ion penetration experiment is conducted to further investigate the effect of RCA on the permeability of HPC. It is found that RCA can lower the temperature during exothermic reaction and prolong the cement hydration process, while the permeability of HPC is increased.