Carbon dioxide capture,utilization and storage(CCUS)technology has been paid more and more attention as an important tech-nical means to deal with the global climate and environmental crisis.Using the mineralization reaction of cement-based materials to ab-sorb carbon dioxide can not only achieve the permanent storage of CO2 and improve the mechanical properties of the products,but also re-duce the amount of cement in concrete,thus reducing a large amount of carbon dioxide emissions.In this paper,using OPC paste as raw material,the effects of different factors(temperature,CO2 content and CaCO3 doping amount)on the carbon sequestration and me-chanical properties of cement were systematically studied,and the composition,micro-morphology and micro-pore structure of mineraliza-tion products were tested and analyzed.The interaction mechanism of temperature,CO2 and CaCO3 on the mineralization process of OPC paste was summarized,and the micro reaction model of carbon dioxide mineralization OPC paste with calcium carbonate was summarized.The results show that it possesses 77.99％carbon sequestration at 70 ℃ and 6.7％strength gain at 28 days,and the optimal addition of CO2 is 0.5％,and the addition of CaCO3 is able to increase the carbon sequestration and strength of OPC slurry,and the CO2 doping can be increased to 3％while maintaining the strength gain when the CaCO3 addition is 10％.
portland cementCO2 mineralizationOPC pastemicroscopic reaction process
维普
万方数据
