Multi-field coupled model and its verification for carbonation analysis of recycled coarse aggregate concrete
Yu Bo , Liu Caiyong , Yang Lufeng
DOI:10.11835/j.issn.1674-4764.2017.02.007
Received June 03, 2016,Revised , Accepted , Available online July 04, 2017
Volume ,2017,Pages 50-57
- Abstract
Carbonation of recycled coarse aggregate (RCA) concrete was a complicated physical diffusion and chemical reaction process, which was difficult to analyze and predict. According to the carbonation mechanism of the RAC concrete, a multi-field coupled model for carbonation analysis of the RCA concrete was developed by combining the diffusion rule of CO2 within the RCA concrete with the conservation law of mass for the carbonatable substances. The proposed model adopted effective diffusion coefficient of CO2, coefficient of carbonation reaction rate, amount of carbonatable substances and adhesive mortar of the RCA as major control parameters. Efficiency and applicability of the proposed model were validated by comparing with experimental data.