东南大学学报（自然科学版）2025，Vol.55Issue(3)：735-742,8.DOI:10.3969/j.issn.1001-0505.2025.03.013
MgO固碳强化再生细骨料的因素及机理研究
Factors and mechanism research of carbonation mineralization with MgO in recycled fine aggregate
摘要
Abstract
The utilization of recycled fine aggregate(RFA)in subgrade filling projects can enhance the recy-cling rate of construction waste and reduce the consumption of natural sand and stone resources.Reactive mag-nesium oxide(MgO)was incorporated into RFA.MgO and the active components in RFA were simultane-ously carbonated by the carbonation method to improve the mechanical properties of RFA and expand its appli-cation scenarios.The response surface center group method was used to design tests and analyze data.Through strength tests and microscopic tests,the influence mechanism of the MgO content,water-cement ra-tio and carbonation duration on the strength was studied.The empirical model of the strength change was estab-lished to explore the strengthening mechanism.The results indicate that the average unconfined compressive strength of RFA with the mass fraction of MgO of 10%can reach up to 11.24 MPa after carbonation.The main carbonation products include rod-shaped nesquehonite,calcite,and aragonite.The composite products include magnesium silicate and dolomite,which repair and bond RFA.These findings provide significant in-sights into optimizing RFA strengthening methods and promoting low-carbon geotechnical engineering.关键词
再生细骨料/碳化/活性氧化镁/建筑垃圾/反应机理Key words
recycled fine aggregate/carbonation/active magnesium oxide/construction and demolition waste/reaction mechanism分类
建筑与水利引用本文复制引用
刘哲汛,何欢,李蔓,郑舒文,刘松玉,章定文..MgO固碳强化再生细骨料的因素及机理研究[J].东南大学学报（自然科学版）,2025,55(3):735-742,8.基金项目
国家自然科学基金资助项目(52478331) （52478331）
国家重点基础研究发展计划资助项目(2023YFB2604800). （2023YFB2604800）
