A New Idea to Improve Carbon Sequestration Efficiency of Cement-based Materials: Selective Internal Exposure Technology
SU Jizhi1, MA Wenfei2, SHAO Hua3, ZHANG Wuchen1, YANG Haitao2,*
1 State Grid Hebei Electric Power Co., Ltd., Economic and Technological Research Institute, Shijiazhuang 050000, China 2 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 3 Hebei Huizhi Power Engineeing Design Co., Ltd., Shijiazhuang 050000, China
Abstract: The carbonation of concrete during service can spontaneously achieve permanent CO2 sequestration, but its carbon sequestration efficiency is low and may cause the corrosion of steel bars. This study draws on the human respiratory system and proposes a selective internal exposure technique that can improve the carbon sequestration efficiency of concrete and avoid the corrosion of steel bars. By setting voids inside the har-dened pastes, the target area in the matrix undergoes carbonization. Moreover, the feasibility of this technology and its impact on the carbonation behavior of cement-based materials were analyzed. The results indicate that the shrinkage of superabsorbent polymer in PVC tubes can expose and carbonize the target area in the matrix, verifying the feasibility of the selective internal exposure technology. After carbonization, the amount of Ca(OH)2 and C-S-H gel in the exposed matrix decreased, the amount of CaCO3 increased, and the micromechanical properties of the matrix significantly improved. The addition of mineral admixtures (fly ash, granulated blast furnace slag powder, and silica fume) will consume Ca(OH)2, resulting in a decrease in the amount of CaCO3 generated by carbonation reaction. By regulating the depth and area of exposure, the application potential of this technology can be further enhanced.
苏佶智, 马文菲, 邵华, 张戊晨, 杨海涛. 一种提升水泥基材料固碳效率的新思路:选择性内暴露技术[J]. 材料导报, 2025, 39(20): 24100120-8.
SU Jizhi, MA Wenfei, SHAO Hua, ZHANG Wuchen, YANG Haitao. A New Idea to Improve Carbon Sequestration Efficiency of Cement-based Materials: Selective Internal Exposure Technology. Materials Reports, 2025, 39(20): 24100120-8.
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2025, Vol. 39 
