State Key Laboratory of Clean EnergyUtilization,Zhejiang University
State Grid Zhejiang Electric PowerCo.,Ltd.,Economic and Technological Research Institute

CO2捕集、利用与封存(CCUS)技术作为应对全球气候与环境危机的重要技术手段受到重视。利用水泥基材料的矿化反应吸收CO2不仅可实现CO2永久封存,改善产品力学性能,还能减少混凝土中水泥用量,从而减少大量CO2排放。以OPC浆体为原材料,系统性研究不同因素(温度、CO2添加量和CaCO3掺杂量)对水泥固碳性能及力学性能的影响,并测试分析了矿化产物的组成、微观形貌及微观孔结构,总结了温度、CO2与CaCO3对OPC净浆矿化过程的相互影响机制,并归纳了外加碳酸钙下二氧化碳矿化OPC浆体的微观反应过程模型。结果表明,70℃下固碳率为77.99%,28d强度提升6.7%,CO2最佳添加量为0.5%,添加CaCO3能提高OPC浆体的固碳率和强度,CaCO3添加量为10%时,CO2掺量可增至3%,同时保持强度增益。

Carbon dioxide capture, utilization and storage (CCUS) technology has been paid more and more attention as an important technical means to deal with the global climate and environmental crisis. Using the mineralization reaction of cement-based materials to absorb carbon dioxide can not only achieve the permanent storage of CO2 and improve the mechanical properties of the products, but also reduce the amount of cement in concrete, thus reducing a large amount of carbon dioxide emissions. In this paper, using OPC paste asraw material, the effects of different factors (temperature, CO2 content and CaCO3 doping amount) on the carbon sequestration and mechanical properties of cement were systematically studied, and the composition, micro-morphology and micro-pore structure of mineralization products were tested and analyzed. The interaction mechanism of temperature, CO2 and CaCO3 on the mineralization process of OPCpaste 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 ofCO2 is 0.5%, and the addition of CaCO3 is able to increase the carbon sequestration and strength of OPC slurry, and the CO2 doping canbe increased to 3% while maintaining the strength gain when the CaCO3 addition is 10%.

浙江省自然科学基金资助项目(LDT23E06013E06)

马超,王涛,吴冰,等.二氧化碳矿化波特兰水泥浆体性能与机制[J].洁净煤技术,2024,30(4):130-136.

MA Chao,WANG Tao,WU Bing,et al.Properties and mechanism of carbon dioxide mineralization portland cement paste[J].Clean Coal Technology,2024,30(4):130-136.