Prediction on CO

2020, Volume 14, Issue 3

Abstract

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Frontiers of Structural and Civil Engineering >> 2020, Volume 14, Issue 3 doi: 10.1007/s11709-020-0635-2

Prediction on CO

. Department of Structural Engineeving, College of Civil Engineering, Tongji University, Shanghai 200092, China.. Shanghai International Airport Company Limited, Shanghai 200152, China

Received: 2020-04-23 Accepted: 2020-06-10 Available online: 2020-06-10

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Abstract

Carbonation of concrete is a process which absorbs carbon dioxide (CO ). Recycled aggregate concrete (RAC) may own greater potential in CO uptake due to the faster carbonation rate than natural aggregate concrete (NAC). A quantitative model was employed to predict the CO uptake of RAC in this study. The carbonation of RAC and the specific surface area of recycled coarse aggregates (RCAs) were tested to verify accuracy of the quantitative model. Based on the verified model, results show that the CO uptake capacity increases with the increase of RCA replacement percentage. The CO uptake amount of 1 m C30 RAC within 50 years is 10.6, 13.8, 17.2, and 22.4 kg when the RCA replacement percentage is 30%, 50%, 70%, and 100%, respectively. The CO uptake by RCAs is remarkable and reaches 35.8%–64.3% of the total CO uptake by RAC when the RCA storage time being 30 days. Considering the fact that the amount of old hardened cement paste in RCAs is limited, there is an upper limit for the CO uptake of RCAs.

Keywords

RAC ; CO₂ uptake ; carbonation ; specific surface area ; RCA

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