Carbonation Mineralization of Full Recycled Concrete Fine Product
ZHOU Linlin1,2,3, HU Xiang1,2,3, CHEN Wei4, Amani Khaskhoussi1,2,3, GUO Shuaicheng1,2,3, SHI Caijun1,2,3,*
1 Key Laboratory of Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082, China; 2 International Innovation and Cooperation Center for Green & Advanced Civil Engineering Materials of Hunan Province, Hunan University, Changsha 410082, China; 3 Key Laboratory of Building Safety & Energy Conservation, Ministry of Education, Hunan University, Changsha 410082, China; 4 State Key Lab SilicateMat Architectures, Wuhan University of Technology, Wuhan 430070, China
Abstract: This work presents an innovative approach to enhance the utilization efficiency of recycled concrete fines (RCF) through dry carbonation technology, simultaneously enabling high-value RCF application and CO2 sequestration. Through systematic investigation of the effects of compaction pressure, particle size and CO2 pressure on the performance of RCF products, the results demonstrate that compaction pressure and RCF particle size significantly influence the initial porosity of products, thereby affecting carbonation degree and strength development. Experimental results indicate that compaction pressure and RCF particle size distribution exert significant control over initial porosity, which in turn go-verns both carbonation efficiency and mechanical property development. It's also found that elevated CO2 partial pressure enhances carbonation kinetics and accelerates early-stage strength acquisition. Under optimized processing conditions, the resulting composites exhibites a compressive strength of 40.8 MPa with a corresponding carbonation conversion rate of 75.17%. Multivariate linear regression analysis is used to establish a quantitative correlation between compressive strength, porosity, and CO2 uptake capacity, demonstrating a positive linear dependence on carbonation degree and an inverse relationship with porosity. Microstructural analysis confirms that the mechanical performance is predominantly go-verned by the synergistic effects of calcium carbonate network formation and porosity evolution. These findings provide fundamental insights for advancing the sustainable utilization of RCF in construction materials.
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2026, Vol. 40 
