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Property Improvement of Recycled Coarse Aggregate by Accelerated Carbonation Treatment under Different Curing Conditions

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  • Shiqing Yang

    (School of Economics and Management, Chongqing Jiaotong University, Chongqing 400074, China)

  • Mingjie Gu

    (National Engineering Research Center for Inland Waterway Regulation, School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China)

  • Hongyi Lin

    (National Engineering Research Center for Inland Waterway Regulation, School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China)

  • Yue Gong

    (National Engineering Research Center for Inland Waterway Regulation, School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China)

Abstract

Recycled aggregate (RA) made from waste concrete has inferior fundamental properties, i.e., apparent density, water absorption, mass variation, carbonation ratio, etc., compared to those of natural aggregate (NA), severely restricting its application in practical projects. However, using CO 2 to accelerate RA carbonation can effectively improve these properties, and this treatment approach can promote energy savings and sustainable development. The accelerated carbonation curing conditions for RA can significantly impact the modification effect of RA. For this purpose, this paper used recycled coarse aggregate (RCA) as a case study. An accelerated carbonation modification treatment experiment for RCA under different accelerated carbonation curing conditions was carried out, and the effects of relative humidity and CO 2 concentration on the apparent density, water absorption, moisture content, mass variation and carbonation ratio of RCA under a constant ambient temperature were explored and quantified. The results indicated that the best-accelerated carbonation curing conditions applicable to this paper’s RCA were confirmed as being an environmental temperature of 20 °C and a relative humidity of 70%, as well as a CO 2 concentration of 20%. Under these conditions, the apparent density and water absorption of CRCA are approximately 1.04 times and 75.30% higher than those of RCA, and, in addition, the carbonation ratio for RCA under the optimal accelerated carbonation curing conditions is all higher than others, thus improving the properties of RCA to a certain degree. Finally, in this paper, the variation trends of the RCA property indexes in terms of carbonation time treated by the best accelerated carbonation curing conditions are examined, and the time-varying models for the RCA property indexes during the accelerated carbonation are established.

Suggested Citation

  • Shiqing Yang & Mingjie Gu & Hongyi Lin & Yue Gong, 2023. "Property Improvement of Recycled Coarse Aggregate by Accelerated Carbonation Treatment under Different Curing Conditions," Sustainability, MDPI, vol. 15(6), pages 1-19, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:4908-:d:1092752
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    References listed on IDEAS

    as
    1. Saloni Arora & Parveen Jangra & Thong M. Pham & Yee Yan Lim, 2022. "Enhancing the Durability Properties of Sustainable Geopolymer Concrete Using Recycled Coarse Aggregate and Ultrafine Slag at Ambient Curing," Sustainability, MDPI, vol. 14(17), pages 1-21, September.
    2. Syed Safdar Raza & Muhammad Fahad & Babar Ali & Muhammad Talha Amir & Yasser Alashker & Ahmed Babekar Elhag, 2022. "Enhancing the Performance of Recycled Aggregate Concrete Using Micro-Carbon Fiber and Secondary Binding Material," Sustainability, MDPI, vol. 14(21), pages 1-16, November.
    3. Bin Lei & Linjie Yu & Zhiyu Chen & Wanying Yang & Cheng Deng & Zhuo Tang, 2022. "Carbon Emission Evaluation of Recycled Fine Aggregate Concrete Based on Life Cycle Assessment," Sustainability, MDPI, vol. 14(21), pages 1-17, November.
    4. Dandan Shi & Qingxuan Shi, 2022. "Study on Mechanical Properties and Mesoscopic Numerical Simulation of Recycled Concrete," Sustainability, MDPI, vol. 14(19), pages 1-16, September.
    5. Sérgio Roberto Da Silva & Jairo José de Oliveira Andrade, 2022. "A Review on the Effect of Mechanical Properties and Durability of Concrete with Construction and Demolition Waste (CDW) and Fly Ash in the Production of New Cement Concrete," Sustainability, MDPI, vol. 14(11), pages 1-27, May.
    6. Daniel Ferrández & Manuel Álvarez & Pablo Saiz & Alicia Zaragoza, 2022. "Experimental Study with Plaster Mortars Made with Recycled Aggregate and Thermal Insulation Residues for Application in Building," Sustainability, MDPI, vol. 14(4), pages 1-17, February.
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