摘要
The modification methods of pozzolan slurry combined with sodium silicate and silicon-based additive were respectively adopted to treat recycled coarse brick-mixed aggregate(RCBA)in this study.The compressive strength and chloride permeability resistance of recycled aggregate concrete(RAC)before and after modification treatment were tested,and the microstructure of RAC was analyzed by mercury intrusion porosimetry(MIP)and scanning electron microscopy(SEM).The results show that the physical properties of RCBA strengthened by modification treatment are improved,and the compressive strength and chloride permeability resistance of treated RAC are also significantly improved.The modification treatment optimizes the pore size distribution of RAC,which increases the number of gel pores and transition pores,and decreases the number of capillary pores and macro pores.The surface fractal dimension shows a significant correlation with chloride diffusion coefficient,indicating that the variation of chloride permeability of treated RAC is consistent with the microstructure evolution.
作者
何子明
申爱琴
WANG Xiaobin
WU Jinhua
WANG Lusheng
HE Ziming;SHEN Aiqin;WANG Xiaobin;WU Jinhua;WANG Lusheng(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China;School of Highway,Chang’an University,Xi’an 710064,China;Department of Road and Bridge Engineering,Liaoning Provincial College of Communica-tions,Shenyang 110122,China)
基金
Funded by the National Natural Science Foundation of China(No.52078050)
the Natural Science Basic Research Plan in Shaanxi Province of China(No.2020JZ-22)。
