(2) Effect of CAS on CRCA apparent density As shown in Figure 4 , under completely dry conditions, Δ ρ a showed an increasing trend and then decreased with increasing CAS, and the RCAs with a CAS of 10–20 mm and an OCS of C40 had the largest Δ ρ a after carbonation, 3.95%, which was the most significant improvement.
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CO<sub>2</sub>-Accelerated Carbonation Modification for Recycled Coarse Aggregate with Various Original Concrete Strengths and Coarse Aggregate Sizes.
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The water absorption of CRCAs with an OCS of C30 decreased with the increase in CAS, while the water absorption of CRCAs with OCSs of C40 and C50 showed a decreasing trend and then increased with the increase in CAS.
The Δ W a of CRCAs with a CAS of 20–25 mm showed a trend to decrease and then increase with the increase in OCS, and the CRCA with an OCS of C50 had the largest Δ W a , 23.38%.