Potential on Carbon Dioxide Utilization to Improve Recycled Concrete Aggregates and Reduce Carbon Footprint
Publication: Geo-Congress 2023
ABSTRACT
Various mitigation approaches have been proposed to decelerate CO2 emissions to the atmosphere. CO2 utilization for the carbonation treatment of recycled concrete aggregates (RCA) is a new strategy to consume CO2 to improve the mechanical and environmental properties of waste concrete materials. During the RCA carbonation process, chemical reactions of CO2 with residual cement paste produce calcium carbonate (CaCO3) and silica (SiO2), which can enhance the mechanical properties of RCA. The treatment also improves the environmental properties of RCA by reducing the concentration of heavy metals in the RCA leachate water. This method, however, requires a good understanding of the carbonation process and the main parameters that affect the efficacy of CO2 utilization. In this manuscript, a laboratory study on the CO2 utilization and sequestration potential of carbonation treatment of RCA at various treatment conditions is presented. Additionally, the potential impact of this technique on the carbon footprint is evaluated based on the CO2 consumption data.
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Geo-Congress 2023
Pages: 64 - 74
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Published online: Mar 23, 2023
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