再生混凝土绿色建筑碳排放评价及灰色参数敏感性分析
徐金俊1,2,乌忱昊3,王 浩4,陈 杰5

(1.南京工业大学 土木工程学院,江苏 南京 211816; 2. 西安建筑科技大学 西部绿色建筑国家重点实验室,陕西 西安,710055 3.东南大学 混凝土及预应力混凝土结构教育部重点实验室,江苏 南京 210096; 4.东南大学 材料科学与工程学院,江苏 南京 211189; 5.南京富源资源利用有限公司,江苏 南京,210034)

再生混凝土; 生命周期评价; 碳排放; 取代率; 灰色关联

Life cycle assessmentand grey parametric sensitivity analysis on the carbon emission of green building made of recycled aggregate concrete
XU Jinjun1,2, WU Chenhao3, WANG Hao4, CHEN Jie5

(1.College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China; 2.State Key Laboratory of Green Building in Western China, Xi'an Univ. of Arch. & Tech., Xi'an 710055 China; 3.Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,Southeast University, Nanjing 210096, China; 4.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China; 5.Nanjing Fuyuan Solid Waste Disposal Co. Ltd., Nanjing 210034, China)

recycled aggregate concrete; life cycle assessment; carbon emission; RCA replacement ratio; grey correlation

DOI: 10.15986/j.1006-7930.2020.03.013

备注

为研究再生混凝土绿色建筑对温室效应碳排放过程的影响,采用生命周期评价法构建了再生混凝土建筑生命周期碳排放量计算边界和计算模型,并利用邓氏灰色关联理论对影响碳排放量关键参数的敏感性进行了数学分析; 以某拟建再生混凝土绿色建筑为工程背景,选取再生混凝土有效水灰比、再生粗骨料取代率、骨料运输距离为变化参数进行生命周期碳排放量及其参数敏感性计算,分析各阶段不同建筑材料碳排放特点.研究结果表明:生命周期碳排放量计算模型边界分为原材料生产阶段、原材料运输阶段、成品或构件加工阶段、成品或构件运输阶段、施工安装阶段、建筑运营阶段、拆解阶段7个阶段; 在生命周期中,再生混凝土绿色建筑碳排放量对有效水灰比的敏感性最高,其次为运输距离,最小为再生粗骨料取代率; 建筑运营阶段和原材料生产阶段是建筑生命周期碳排放量最大的两个阶段.

In order to study the impact of green building made of recycled aggregate concrete(RAC)on the greenhouse effect carbon emission, life cycle assessment method was used to construct the life cycle carbon emission calculation boundary and calculation model for recycled aggregate concrete buildings.The sensitivity of the key parameters affecting carbon emission is analyzed by using the Deng's grey correlation theory.Based on a planned constructed recycled aggregate concrete green building, the designed water-to-cement ratio, recycled coarse aggregate(RCA)replacement ratio and aggregate transport distance were selected as the changing parameters to calculate their life cycle carbon emission and sensitivity.The carbon emission characteristics of different building materials at various stages were analyzed.With respect to the planned constructed recycled aggregate concrete green building, the optimization design of life cycle carbon emission was performed by considering the principles of economic benefits and mechanical properties of RAC.Results show that the calculation model boundary of life cycle carbon emission can be divided into 7 stages, i.e., raw materials production stage, raw material transportation stage, processing stage, finished products or components transportation stage, construction stage, building operation stage, and demolition stage.In the life cycle, the element most sensitive to the carbon emission is the designed water-to-cement ratio, and the following one is the transport distance, and the smallest sensitive one to the carbon emission is the RCA replacement ratio.