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Preparation of slag-based foam concrete by chemical foaming for CO2 sequestration

Li Wei, Lyu Zhiwen, Liu Jian, Li Wei, Sun Ziqiang, Ma Yan, Cheng Weimin, Meng Xiangjun, Xin Lin, Sun Xikui

Environment Protection Engineering

2024

Vol. 50, nr 2

95--114

Carbon dioxide emissions are among the most influential causes of global warming, and the recovery, capture, and comprehensive utilization of CO2 are the keys to carbon emissions reduction. High-porosity foam concrete was prepared using CaO as the alkali activator, and H2O2 as the foaming agent. Based on a single-factor experiment and response surface analysis, the best preparation condi-tions for foam concrete were obtained (water-to-cement ratio 0.4, alkali excitation dosage 10.73%, foaming agent dosage 8.26%). The porous material prepared under the optimal process conditions can achieve a CO2. sequestration performance of 91.59 kg/m3, and the actual sequestration capacity is con-sistent with the theoretical prediction value of 90.89 kg/m3. Mechanistic analysis shows that the precarbonation hydration products of foam concrete are mainly C-S-H gel, Ca(OH)2, and hydrotalcite-like compounds, which bond the slag particles together to form a three-dimensional spatially firmly con-nected structure. This study provides a reference for the application of alkaline solid waste materials in the field of carbon sequestration.