摘要
CO2矿化养护固废胶凝材料可实现固废的多样化、减量化消纳,同时固定封存CO2,具有双重减碳效益.为综合考虑材料的力学性能、固碳效果与环境影响,选取抗压强度、固碳率、固碳程度、碳化效率、碳排放和能源消耗为评价指标,设计11组配合比试件进行综合性能的量化分析和评分.结果表明,与标准养护相比,矿化养护碱激发固废胶凝材料的抗压强度和整体固碳效果有显著提升.固废具有优异的减排和降耗优势,但碱激发剂的使用对环境影响较大.当粉煤灰、赤泥和钢渣质量比为7∶2∶1,水固比、碱胶比和水玻璃模数分别为0.28、0.26、1.2时,矿化养护碱激发固废胶凝材料的综合性能最优.CO2矿化养护技术与固废资源化利用相结合可释放巨大的固碳潜能,是推动减污、降碳协同增效的重要举措.
Abstract
CO2 mineralization curing solid waste cementitious materials can achieve diversified and reduced consumption of solid waste,while fixing and storing CO2,which has dual carbon reduction benefits.To comprehensively consider the mechanical properties,carbon sequestration effect,and environmental impact of materials,this article selected compressive strength,carbon sequestration rate,carbon sequestration degree,carbonization efficiency,carbon emission,and energy consumption as evaluation indicators,and designed 11 sets of mixed proportion specimens for quantitative analysis and evaluation of comprehensive performance.The results show that compared with standard curing,the compressive strength and carbon sequestration effect of mineralization curing alkali activated solid waste cementitious materials have been significantly improved.Solid waste has excellent emission and consumption reduction advantages,but the use of alkali activator has a significant impact on the environment.When the mass ratio of fly ash,red mud,and steel slag is 7∶2∶1,the water-solid ratio,alkali adhesive ratio,and water glass modulus are 0.28,0.26,and 1.2,the comprehensive performance of mineralization curing alkali activated solid waste cementitious materials is the best.The combination of CO2 mineralization curing technology and solid waste utilization can unleash enormous carbon sequestration potential,which is an important measure to promote the synergistic effect of pollution reduction and carbon reduction.
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