TY - JOUR
T1 - Fully utilizing carbonated recycled aggregates in concrete
T2 - Strength, drying shrinkage and carbon emissions analysis
AU - Xiao, Jianzhuang
AU - Zhang, Hanghua
AU - Tang, Yuxiang
AU - Deng, Qi
AU - Wang, Dianchao
AU - Poon, Chi sun
N1 - Funding Information:
The financial support from the the National Key R&D Program of China ( 2022YFE0198300 ), Science and Technology Commission of Shanghai Municipality ( 22dz1207300 ), and the GCCRN Core Project 11 are highly acknowledged.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12/1
Y1 - 2022/12/1
N2 - In this study, natural aggregates, recycled aggregates (RAs), and carbonated RAs were combined to prepare concrete. Strength, drying shrinkage, microstructures, and the carbon emissions of concrete prepared with different aggregate combinations were explored and compared. The results show that the compressive strengths of carbonated fully recycled aggregate concrete (CFRAC) increased by 20.9% and the drying shrinkage at 180 days decreased by 23.3% compared with that of concrete with RAs due to the reduction of water absorption of RAs and the additional water. The pore structure of CFRAC was densified and improved by carbonation treatment on RAs. Furthermore, the carbon emission analysis showed that CFRAC had 7.1%∼13.3% lower carbon emission and 13.4%∼18.4% lower CO2 intensity than natural/recycled aggregate concrete due to the shorter transportation distance and the carbon absorption. Generally, CFRAC had improved properties and environmental benefits, which shows carbonation treatment is a valuable way to promote waste concrete recycling.
AB - In this study, natural aggregates, recycled aggregates (RAs), and carbonated RAs were combined to prepare concrete. Strength, drying shrinkage, microstructures, and the carbon emissions of concrete prepared with different aggregate combinations were explored and compared. The results show that the compressive strengths of carbonated fully recycled aggregate concrete (CFRAC) increased by 20.9% and the drying shrinkage at 180 days decreased by 23.3% compared with that of concrete with RAs due to the reduction of water absorption of RAs and the additional water. The pore structure of CFRAC was densified and improved by carbonation treatment on RAs. Furthermore, the carbon emission analysis showed that CFRAC had 7.1%∼13.3% lower carbon emission and 13.4%∼18.4% lower CO2 intensity than natural/recycled aggregate concrete due to the shorter transportation distance and the carbon absorption. Generally, CFRAC had improved properties and environmental benefits, which shows carbonation treatment is a valuable way to promote waste concrete recycling.
KW - Carbon emission analysis
KW - CO treatment
KW - Drying shrinkage
KW - Fully recycled aggregate concrete (FRAC)
KW - Recycled coarse and fine aggregate
UR - http://www.scopus.com/inward/record.url?scp=85139592050&partnerID=8YFLogxK
U2 - 10.1016/j.jclepro.2022.134520
DO - 10.1016/j.jclepro.2022.134520
M3 - Journal article
AN - SCOPUS:85139592050
SN - 0959-6526
VL - 377
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 134520
ER -