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<p>In order to analyze the effect of carbonated recycled coarse aggregate (RCA) on the mechanical and chloride ion penetration resistance of self-compacting concrete (SCC), recycled self-compacting concrete (RCASCC) was prepared with RCA treated with different admixtures (15%, 30%, and 50%) and different carbonation pressures (0, 75&#xa0;kPa, and 150&#xa0;kPa), and was tested for its compressive strength, flexural strength, electric flux, and its pore structure and microstructure were analyzed. The results indicate that the replacement rate of recycled concrete aggregates (RCA) and carbonation pressure significantly influence the compressive strength, flexural strength, and electrical flux of RCASCC. As the amount of RCA increases, the compressive strength of RCASCC initially increases, followed by a decrease, while electrical flux first decreases and then increases. With an increase in carbonation pressure, the compressive strength of RCASCC gradually decreases, and the electrical flux also initially decreases before increasing. Furthermore, the increase of RCA content and carbonation pressure lead to a reduction in the flexural strength of RCASCC. Furthermore, at a 30% RCA replacement ratio and a carbonation pressure of 75&#xa0;kPa, the 28-day compressive strength and chloride ion permeability resistance of the RCASCC improved by 9.2% and 22.6%, respectively. The pre-wetting of the RCASCC refines the pore structure, resulting in a denser interfacial transition zone.</p>

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Study on the Effect of Carbonated Recycled Coarse Aggregate Admixture on the Properties of Self-Compacting Concrete

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Shukai Cheng,
  • Qianyong Liang,
  • Guofu Chen,
  • Kang Chen,
  • Hongtao Wang

摘要

In order to analyze the effect of carbonated recycled coarse aggregate (RCA) on the mechanical and chloride ion penetration resistance of self-compacting concrete (SCC), recycled self-compacting concrete (RCASCC) was prepared with RCA treated with different admixtures (15%, 30%, and 50%) and different carbonation pressures (0, 75 kPa, and 150 kPa), and was tested for its compressive strength, flexural strength, electric flux, and its pore structure and microstructure were analyzed. The results indicate that the replacement rate of recycled concrete aggregates (RCA) and carbonation pressure significantly influence the compressive strength, flexural strength, and electrical flux of RCASCC. As the amount of RCA increases, the compressive strength of RCASCC initially increases, followed by a decrease, while electrical flux first decreases and then increases. With an increase in carbonation pressure, the compressive strength of RCASCC gradually decreases, and the electrical flux also initially decreases before increasing. Furthermore, the increase of RCA content and carbonation pressure lead to a reduction in the flexural strength of RCASCC. Furthermore, at a 30% RCA replacement ratio and a carbonation pressure of 75 kPa, the 28-day compressive strength and chloride ion permeability resistance of the RCASCC improved by 9.2% and 22.6%, respectively. The pre-wetting of the RCASCC refines the pore structure, resulting in a denser interfacial transition zone.