碳化处理对再生骨料物理性能改善的工艺优化研究OACHSSCD
Study on Process Optimization of Carbonation Treatment for Improving the Physical Properties of Recycled Concrete Aggregate
再生骨料(Recycled Concrete Aggregate,RCA)因附着旧砂浆且存在微裂纹与高孔隙率,导致吸水率偏高、抗破碎能力不足,限制了其在中高性能混凝土中的应用.为改善 RCA 的物理性能,开展气体加速碳化试验,重点研究"碳化-休息"循环模式下的工艺优化及强化效果.结果表明,碳化处理可降低压碎值并显著降低吸水率,3 次循环工艺下压碎值由 22.50%降至 21.30%,24 h 吸水率由 4.22%降至 3.60%.研究明确了气体循环碳化的优选工艺窗口,可为 RCA 高效强化与工程应用提供参考.
Recycled Concrete Aggregate(RCA)has a high water absorption rate and insufficient anti crushing ability due to its adhesion to old mortar,microcracks,and high porosity,which limits its application in medium to high performance concrete.To improve the physical properties of RCA,gas accelerated carbonization tests were conducted,with a focus on studying the process optimization and strengthening effects under the"carbonization-rest"cycle mode.The results showed that carbonization treatment can reduce the crushing value and significantly decrease the water absorption rate.Under the 3-cycle process,the crushing value decreased from 22.50%to 21.30%,and the 24 h water absorption rate decreased from 4.22%to 3.60%.The study has identified the optimal process window for gas circulation carbonization,which can provide reference for efficient strengthening and engineering applications of RCA.
彭飞勇;张腾元;谢毅;张培语;岑海;吴涛
六盘水师范学院 土木与规划学院,贵州 六盘水 553004六盘水师范学院 土木与规划学院,贵州 六盘水 553004六盘水师范学院 土木与规划学院,贵州 六盘水 553004六盘水师范学院 土木与规划学院,贵州 六盘水 553004六盘水师范学院 土木与规划学院,贵州 六盘水 553004六盘水师范学院 土木与规划学院,贵州 六盘水 553004
建筑与水利
再生骨料(RCA)气体碳化循环处理压碎指标吸水率孔隙结构碳酸钙
Recycled Concrete Aggregate(RCA)gaseous carbonationcyclic treatmentcrushing valuewater absorptionpore structurecalcium carbonate
《中国资源综合利用》 2026 (7)
1-3,3
贵州省教育厅青年人才科技成长项目"'双碳'理念下服务'无废城市'建设的纳米-碳化协同增强再生混凝土关键技术与性能提升机制"(黔教技[2025]141号)国家级大学生创新训练项目"低碳循环-一种再生混凝土骨料固碳技术研究及降碳分析"(2024109770671).
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