再生骨料碳化改性及其减碳贡献分析

Carbonation Modification of Recycled Aggregate and Carbon Dioxide Sequestration Analysis

摘要:

利用再生骨料与二氧化碳的碳化反应，可以提升再生骨料的性能，同时固定二氧化碳。阐明了水泥基材料固碳对于碳中和的重要性，总结了再生骨料碳化改性原理。基于菲克定律建立了混凝土服役、拆除后生产再生骨料贮存、再生骨料再利用三阶段固碳模型，并进行了案例分析。基于再生骨料不同的碳化处理方式建立了再生骨料碳化减碳贡献模型，并针对2020~2060年内我国预计产生的再生骨料量，核算了不同固碳方式的减碳效果，结果表明加速碳化方法可释放再生骨料巨大的减碳潜能，是实现再生骨料快速减碳，助力碳中和的重要举措。

Abstract:

The carbonation reaction of recycled aggregate and carbon dioxide could improve the properties of recycled aggregate and fix carbon dioxide at the same time. This paper clarifies the importance of carbon sequestration in cement-based materials for carbon neutralization and summarizes the mechanism of carbonation modification of recycled aggregates. Based on the Fick’s law， the carbon sequestration model in the three stages of original concrete service， recycled aggregate stacking， and recycled concrete service was established， and a case study was conducted. Moreover， the carbon reduction contribution model of recycled aggregate carbonation was established， and the annual carbon reduction accounting was performed for different carbonation methods of recycled aggregates， based on the estimated amount of recycled aggregate produced in China from the year 2020 to 2060. The results show that accelerated carbonation approaches could release the huge carbon reduction potential of recycled aggregates， which is an important measure to promote carbon neutrality.