再生混凝土全生命周期碳化的CO_(2)排放评价  

CO_(2) emission evaluation of full life cycle carbonization of recycled concrete

作　　者：雷斌[1] 杨婉莹 余林杰 晏育松[1] LEI Bin;YANG Wanying;YU Linjie;YAN Yusong(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学工程建设学院,江西南昌330031

出　　处：《混凝土与水泥制品》2023年第11期82-87,共6页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51968046);江西省主要学科学术和技术带头人培养计划——领军人才项目(20204BCJ22003)。

摘　　要：为了减少再生混凝土全生命周期CO_(2)排放量,考虑再生混凝土服役阶段的碳化作用,采用碳化再生粗骨料、CO_(2)环境下搅拌和养护的固碳方式对再生混凝土全生命周期进行碳化设计。运用生命周期评价(LCA)理论,将再生混凝土生命周期分为6个阶段,分别为原材料生产和运输、再生混凝土的生产、运输、施工、服役、拆除,并建立了各阶段CO_(2)排放计算模型,探究了1 m^(3)的C30再生混凝土全生命周期CO_(2)排放量。此外,对再生混凝土全生命周期CO_(2)排放的环境影响进行了评价。结果表明:与仅服役阶段碳化作用下的再生混凝土全生命周期CO_(2)排放量(APL)相比,再生混凝土全生命周期碳化作用下的CO_(2)排放量(BPL)减少;与再生粗骨料固碳相比,再生混凝土搅拌和养护固碳对降低再生混凝土全生命周期CO_(2)排放的作用更好;用再生粗骨料取代部分天然粗骨料可以节约环境成本,减少CO_(2)排放量,具有显著的环境价值和经济价值。In order to reduce the full life cycle CO_(2)emission of recycled concrete,the carbonization effect during the service stage of recycled concrete was considered,and the carbonization design of the full life cycle of recycled concrete was carried out by using carbonized recycled coarse aggregates,mixing and curing in CO_(2)environment.Using the theory of life cycle assessment(LCA),the life cycle of recycled concrete was divided into six stages,namely raw material production and transportation,production,transportation,construction,service and demolition of recycled concrete.The CO_(2)emission calculation models for each stage were established,and the CO_(2)emission during the full life cycle of 1 m^(3) of C30 recycled concrete were explored.In addition,the environmental impact of CO_(2)emission during the full life cycle of recycled concrete was evaluated.The results show that compared with the full life cycle CO_(2)emission(APL)of recycled concrete under carbonization during the service stage only,the CO_(2)emissions(BPL)of recycled concrete under full life cycle carbonization are reduced.Compared with the carbon sequestration of recycled coarse aggregates,the mixing and curing of recycled concrete have a better effect on reducing CO_(2)emission during the full life cycle of recycled concrete.Replacing some natural coarse aggregates with recycled coarse aggregates can save environmental costs,reduce CO_(2)emission,which has significant environmental and economic value.

关 键 词：再生混凝土 再生粗骨料 CO_(2)排放 固碳方式 生命周期评价 环境价值 

分 类 号：TU528.01[建筑科学—建筑技术科学]