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Effect of CO_(2) Curing on the Physical Properties of Recycled Coarse Aggregate with Different attached mortar contents

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 905-911页

作者： ZHU Pinghua LI Haichao LIU Hui YAN Xiancui WANG Xinjie CHEN Chunhong Department of Civil Engineering Changzhou UniversityChangzhou213164China

The effects of carbon dioxide (CO_(2)) curing conditions (temperature,relative humidity and CO_(2) curing time) on the physical properties of recycled coarse aggregate (RCA) with varying attached mortar (AM) contents were *** and after CO_(2) curing,the physical properties in terms of the apparent density,water absorption and crushing value of RCA were tested and the quality of RCA was ***,scanning electron microscope was used to observe the microstructure of *** show that the physical properties variation of RCA with higher AM content are more significant,and the quality of RCA with lower AM content is easier to be upgraded during CO_(2) *** physical properties of RCA with 40.8% AM content are earlier stable than that with no less than 44.5% AM content during CO_(2) *** optimal temperature and relative humidity are 50 ℃ and 55% for CO_(2) curing,***_(2) curing is incapable of upgrading the quality of RCA with AM no less than 50.6%.The quality of RCA with 44.5% AM content can be upgraded only under the optimum CO_(2) curing *** relative humidity higher than 40% and the CO_(2) curing time more than 12 h,CO_(2) curing upgrades the quality of RCA with 40.8% AM content.

关键词： recycled coarse aggregate attached mortar content carbon dioxide curing curing time relative humidity temperature

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