深圳市建筑水泥流量-存量分析及环境影响评估  

Analysis of cement flow and stock of urban buildings and its environmental impact assessment in Shenzhen City

作　　者：张宇[1] 段华波 张宁[1] ZHANG Yu;DUAN Hua-bo;ZHANG Ning(Key Laboratory of Coastal Urban Resilient Infrastructures,Ministry of Education,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Underground Polis Academy,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学土木与交通工程学院,滨海城市韧性基础设施教育部重点实验室,广东深圳518060 [2]深圳大学未来地下城市研究院,广东深圳518060

出　　处：《中国环境科学》2021年第1期482-489,共8页China Environmental Science

基　　金：深圳市科创委基础研究项目(JCYJ20190808123013260)。

摘　　要：我国城镇化进程持续深入推进,大规模城市更新建造活动消耗了大量水泥等建筑材料.以深圳市为例,采用自下而上的物质流分析方法估算了自特区建设以来(1979~2018年)城市房屋建筑中的水泥存量和流量,并分析了其产生的综合环境影响(以碳排放当量为度量指标).研究结果表明:1979~2018年间,深圳市建筑水泥历史累积消耗约为8120万t,年均消耗超过200万t,水泥累计流出量(建筑废弃物)约为总流入量的25%~29%;截至2018年,深圳市建筑水泥存量达到6200万t,人均水泥存量达到4.7t.相应地,全部所消耗的水泥材料在生产阶段的碳排放累计可达6880万tCO2eq,其中仅有9%的碳排放量可被既有存量建筑“自然”吸附,但仍有至少约11%的碳排放量可通过废弃混凝土(流量)再生骨料进行“逆向”吸附封存.最后,基于建筑水泥存流量、碳排放及碳汇量等量化数据,提出了加强水泥使用管理、实现水泥生产碳减排以及水泥材料碳汇能力提升等相关措施建议.China's rapid urbanization with massive construction activities accelerated raw materials extraction and consumption such as cement.This study conducted a bottom-up material flow analysis to estimate the stocks and flows of cement in building sector,using Shenzhen(China)from 1979 to 2018 as an example.The environmental impacts measured by carbon emission equivalent was also estimated for sustainability.Results show that approximately 81.2 million metric tons(Mt)cement were consumed for building construction from 1979 to 2018 in Shenzhen,with an annual consumption of over 2Mt averagely.Moreover,cement outflows(measured by construction and demolition waste)accounted for 25%~29% of total inflows.By 2018,the cement stock in buildings amounted to 62Mt(4.7t/cap),embedding 68.8Mt carbon emissions.An estimation of 9% of this amount emissions were directly absorbed by the existed buildings,with another 11% could potentially be carbonated by recycled concrete aggregate(flow)if subject proper condition.Finally,based on the evaluation of cement flows and stocks in Shenzhen,strengthening effective cement management,promoting cement carbon reduction,and improving carbon sequestration capacity were raised for sustainable urban development.

关 键 词：城市建筑 水泥 流量存量 碳排放 固碳 

分 类 号：X820.3[环境科学与工程—环境工程] X799.1