CO2矿化养护对混凝土性能影响的试验研究
Experimental study on the influence of CO2 mineralization curing on concrete performance
关键词：
CO2矿化养护；混凝土；固碳率；性能；微观结构
Key words：
CO2 mineralization curing; Concrete; Carbon fixation rate; Performance; Microstructure
刊期：
2025年第8期
DOI：
10.19761/j.1000-4637.2025.08.111.06
文章编号：
基金项目：
上海市2022年度“科技创新行动计划”科技支撑碳达峰碳中和专项项目（22dz1207300）。
作者：
林茂松1，2，杨利香1，2，杨 光1，2
单位：
1.上海市建筑科学研究院有限公司，上海 200032；2.上海工业固体废弃物资源化利用工程技术 研究中心，上海 200032
摘要
摘 要：研究了CO2矿化养护（预养护条件、CO2浓度、养护压力和养护时间）对混凝土固碳率和性能的影响，并对养护后混凝土的微观形貌和矿物组成进行了分析。结果表明：通过合理的预养护可以降低试件的剩余水灰比，有效提高试件的表观固碳率；相对于标准和加热干燥预养护，室温吹风为最宜预养护条件；当CO2浓度为99.9%、养护压力为0.8 MPa、养护时间为12 h时，试件的固碳能力较好，28 d抗压强度达60.0 MPa，抗氯离子渗透、抗渗和抗冻性能均较好，28 d碳化深度稍有增加，但28 d至56 d碳化深度不再增加；CO2矿化养护会消耗混凝土中的Ca(OH)2，生成更多的CaCO3产物，改善了混凝土的微观结构。
Abstract: The influence of CO2 mineralization curing (pre-curing conditions, CO2 concentration, curing pressure, and curing time) on the carbon fixation rate and performance of concrete was studied, and the microstructure and mineral composition of the cured concrete were analyzed. The results indicate that reasonable pre-curing can reduce the residual water-cement ratio of the specimens, effectively improve the apparent carbon fixation rate of the specimens. Compared to standard and heating drying pre-curing, room temperature air blowing is the most suitable pre-curing condition. When the CO2 concentration is 99.9%, the curing pressure is 0.8 MPa, and the CO2 mineralization curing time is 12 h, the carbon fixation ability of the specimen is good, the compressive strength at 28 d reaches 60.0 MPa, and the resistance to chloride ion penetration, permeability, and frost resistance is good. The carbonization depth slightly increases at 28 d, but the carbonization depth does not increase from 28 d to 56 d. CO2 mineralization curing consumes Ca(OH)2 in concrete, generates more CaCO3 products, and improves the microstructure of concrete.
结论
（1）通过合理的预养护可降低试件的剩余水灰比，有效提高表观固碳率。综合考虑表观固碳率、抗压强度等试验结果，室温吹风为最宜预养护条件。
（2）当CO2浓度为99.9%、养护压力为0.8 MPa、养护时间为12 h时，试件的固碳能力较好，28 d抗压强度为60.0 MPa，28 d电通量、抗渗等级和抗冻性能均与标准养护对照组试件相近，28 d碳化深度稍有增加，但28 d至56 d碳化深度不再增加。
（3）微观分析结果表明，CO2矿化养护会消耗混凝土中的Ca(OH)2，生成更多的CaCO3产物，改善了混凝土的微观结构。
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引用本文
林茂松,杨利香,杨光.CO2矿化养护对混凝土性能影响的试验研究[J].混凝土与水泥制品,2025(8):111-114.
LIN M S,YANG L X,YANG G.Experimental study on the influence of CO2 mineralization curing on concrete performance[J].China Concrete and Cement Products,2025(8):[J].China Concrete and Cement Products,2025(8):111-114.
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