Effect of Carbide Slag Addition on Properties and Carbon Sequestration Efficiency of Fresh Cement Slurry Mixed with CO2
MIN Qianshen1,GU Tao1,2,*, HE Bo1, WEI Renjie1, LIU Chuanbei1, ZHANG Lihua1, LIU Laibao1
1 School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China 2 State Key Laboratory of Green Building Materials, Beijing 100024, China
Abstract: In order to improve the carbon sequestration efficiency of cement-based materials directly mixed with CO2, the effects of carbide slag and CO2 on the fluidity, setting time, compressive strength, carbon sequestration amount and carbon sequestration efficiency of cement paste is studied by adding carbide slag into fresh cement slurry as an enhanced carbon sequestration material. The results show that the addition of carbide slag can reduce the fluidity of the cement slurry, and accelerate the setting time of the slurry, and also reduce the strength of the cement mortar specimen in different curing ages. When CO2 is injected into the slurry, the fluidity of the slurry is further reduced but the setting time of the slurry is delayed and the compressive strength of cement is improved. When carbide slag is mixed with CO2, the carbon sequestration amount and carbon sequestration efficiency of cement paste can be improved. When the carbide slag content is 15% to cement, the carbon sequestration amount is the highest, which reaches 6.95%. When the carbide slag content is 10% to cement, the carbon sequestration efficiency is the hig-hest, which can reach 13.03%. The purpose of this work is to provide reference for the establishment of a new approach for the preparation of low-carbon cement-based materials and the collaborative utilization of carbide slag resources.
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2024, Vol. 38 
