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<p>Carbonation treatment is an efficient approach to optimize the properties of recycled concrete aggregate (RCA), and the interaction between CO<sub>2</sub> and H<sub>2</sub>O during the carbonization process is a key factor affecting the carbon storage amount and product type. Previous studies have mainly discussed the effect of external humidity on the RCA carbonization process, but this study clarified the role of internal moisture content (IMC) in the RCA carbonization process by investigating the effects of RCA moisture content and carbonization treatment time on RCA performance. Results indicate that in the ambient humidity of 60 ± 5%, altering the IMC of RCA from 0% to 20% results in increasing by 3.3% of compressive strength and reducing 14.3% of chloride ion permeability coefficient in the steam-cured concrete containing RCA after 3-d carbonation. This primarily results from the increase in calcium carbonate content and surface chemical activity in the carbonated RCA (CRCA). Additionally, compared to the steam-cured recycled aggregate concrete (SC) containing uncarbonated RCA, the compressive strength of SC containing 3-d carbonated RCAs with 20% IMC increase by 9.9%, whereas its chloride ion permeability coefficient reduces by 16.9%. This study provides new insights for improving the performance of RCA and SC, while also promoting CO₂ sequestration and sustainable construction application of RCA. </p> Graphical Abstract <p></p>

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Producing high-quality recycled aggregate precast concrete by increasing the carbon storage capacity of recycled aggregates through optimizing moisture content

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Baoju Liu,
  • Lvfan Chen,
  • Minghu Zhang,
  • Xuezhen Zhu,
  • Huiwen Ye,
  • Jinyan Shi

摘要

Carbonation treatment is an efficient approach to optimize the properties of recycled concrete aggregate (RCA), and the interaction between CO2 and H2O during the carbonization process is a key factor affecting the carbon storage amount and product type. Previous studies have mainly discussed the effect of external humidity on the RCA carbonization process, but this study clarified the role of internal moisture content (IMC) in the RCA carbonization process by investigating the effects of RCA moisture content and carbonization treatment time on RCA performance. Results indicate that in the ambient humidity of 60 ± 5%, altering the IMC of RCA from 0% to 20% results in increasing by 3.3% of compressive strength and reducing 14.3% of chloride ion permeability coefficient in the steam-cured concrete containing RCA after 3-d carbonation. This primarily results from the increase in calcium carbonate content and surface chemical activity in the carbonated RCA (CRCA). Additionally, compared to the steam-cured recycled aggregate concrete (SC) containing uncarbonated RCA, the compressive strength of SC containing 3-d carbonated RCAs with 20% IMC increase by 9.9%, whereas its chloride ion permeability coefficient reduces by 16.9%. This study provides new insights for improving the performance of RCA and SC, while also promoting CO₂ sequestration and sustainable construction application of RCA.

Graphical Abstract