TY - JOUR
T1 - Long-term shrinkage and mechanical properties of fully recycled aggregate concrete
T2 - Testing and modelling
AU - Zhang, Hanghua
AU - Xiao, Jianzhuang
AU - Tang, Yuxiang
AU - Duan, Zhenhua
AU - Poon, Chi sun
N1 - Funding Information:
The financial support from the National Natural Science Foundation of China (No: 52078358 , No: 52178244 , No: 51325802 ), National Key R&D Program of China ( 2021YFE0198300 ) and the GCCRN Core Project 11 are highly acknowledged. CSP wishes to thank the financial support of Policy Innovation and Co-ordination Office through the Strategic Public Policy Research Funding Scheme.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/7
Y1 - 2022/7
N2 - To advance the research on recycled concrete (RC), recycled coarse aggregate (RCA), recycled fine aggregate (RFA) and recycled powder (RP) were used in preparing fully recycled aggregate concrete (FRAC), which lead to more comprehensive usage in the recycling of concrete waste. Recycled aggregates were studied as types of aggregate combinations instead of partial substitutes, and four aggregate combinations were designed with the use of natural and recycled aggregates in this study. The effects of different aggregate combinations on the long-term mechanical and shrinkage properties of concrete were examined. Furthermore, the effects of using RP on the properties of FRAC were studied. The results showed that using fully recycled aggregate (FRA) combinations had negative effects on the long-term mechanical and shrinkage properties of concrete, which were consistent with previous research on recycled concrete. However, the effect caused by FRA combination were found to be higher than the sum of that caused by fully recycled coarse aggregate and fully recycled fine aggregate combination. Moreover, RP decreased the mechanical properties of FRAC by 5%–17% whereas the shrinkage strain of FRAC in 180 days were decreased by 3%–13% with the increase of RP content from 10% to 30%. A long-term shrinkage model suitable for FRAC was derived by adding modification coefficients for aggregate combinations and RP contents to the current models.
AB - To advance the research on recycled concrete (RC), recycled coarse aggregate (RCA), recycled fine aggregate (RFA) and recycled powder (RP) were used in preparing fully recycled aggregate concrete (FRAC), which lead to more comprehensive usage in the recycling of concrete waste. Recycled aggregates were studied as types of aggregate combinations instead of partial substitutes, and four aggregate combinations were designed with the use of natural and recycled aggregates in this study. The effects of different aggregate combinations on the long-term mechanical and shrinkage properties of concrete were examined. Furthermore, the effects of using RP on the properties of FRAC were studied. The results showed that using fully recycled aggregate (FRA) combinations had negative effects on the long-term mechanical and shrinkage properties of concrete, which were consistent with previous research on recycled concrete. However, the effect caused by FRA combination were found to be higher than the sum of that caused by fully recycled coarse aggregate and fully recycled fine aggregate combination. Moreover, RP decreased the mechanical properties of FRAC by 5%–17% whereas the shrinkage strain of FRAC in 180 days were decreased by 3%–13% with the increase of RP content from 10% to 30%. A long-term shrinkage model suitable for FRAC was derived by adding modification coefficients for aggregate combinations and RP contents to the current models.
KW - Fully recycled aggregate concrete
KW - Long-term mechanical properties
KW - Recycled aggregate
KW - Shrinkage behavior
KW - Shrinkage prediction model
UR - http://www.scopus.com/inward/record.url?scp=85127817111&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2022.104527
DO - 10.1016/j.cemconcomp.2022.104527
M3 - Journal article
AN - SCOPUS:85127817111
SN - 0958-9465
VL - 130
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104527
ER -