摘要
建筑行业将推广装配式建筑作为实现“双碳”目标的重要途径之一,但现有研究多关注单体案例,缺乏对装配式建筑普适减排效果的理解与分析。本文筛选出62个具有详细数据的预制装配式建筑文献案例,统一系统边界为建筑物化阶段(建材生产、运输和现场施工),采用元分析方法研究了碳核算方法与建筑特征两方面共8个维度对预制装配式建筑碳排放的影响。结果显示,案例间的单位面积隐含碳差异较大。仅考虑物化阶段,钢结构建筑的单位面积隐含碳均值约为预制混凝土建筑的1.9倍;建筑层数与建筑类型对单位面积隐含碳无显著影响。相较于现浇混凝土建筑,装配式钢结构和预制混凝土建筑均可减少隐含碳排放,平均减碳率为12.54%。为切实有效减少隐含碳排放,预制混凝土建筑应提升工厂预制水平、减少预制构件运输距离、优化现场施工工艺,钢结构建筑可考虑利用高性能钢结构以减少钢材用量。
Prefabricated buildings are regarded as an effective way to achieve carbon peaking and carbon neutrality in the construction industry.However,as most previous studies evaluated a single case of prefabricated buildings,the carbon emissions of prefabricated buildings have not been understood and analyzed comprehensively.In this study,62 carbon analyses of prefabricated buildings were selected after a systematic literature screening and then examined by a meta-analysis involving 8 factors from the perspectives of calculation methods and inherent building characteristics.The system boundary for all the 62 cases included material production,transportation,and onsite construction.The results revealed significant differences in the average embodied carbon emissions per unit area among these cases.Only in terms of material production,transportation,and onsite construction,the average embodied carbon emissions per unit area of steel structure buildings are about 1.9 times that of precast concrete buildings.The number of building floors and building types did not significantly affect embodied carbon emissions per unit area.Compared with cast-in-place concrete buildings,prefabricated steel structure and precast concrete buildings can both reduce embodied carbon emissions by 12.54%on average.To effectively reduce embodied carbon emissions,precast concrete buildings should improve precast quality in factories,reduce the transportation distance of precast components,and optimize the on-site construction technology.As for steel structure buildings,the use of high-performance steel structures can be considered to reduce the amount of steel used.
作者
卢昱杰
杨晓露
李佩娴
宋广翰
何凌云
肖建庄
肖绪文
LU Yujie;YANG Xiaolu;LI Peixian;SONG Guanghan;HE Lingyun;XIAO Jianzhuang;XIAO Xuwen(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education,Tongji University,Shanghai 200092,China;College of Architecture and Urban Planning,Tongji University,Shanghai 200092,China;Key Laboratory of Ecology and Energy Saving Study of Dense Habitat(Tongji University),Ministry of Education,Shanghai 200092,China)
出处
《建筑科学》
CSCD
北大核心
2024年第12期8-17,共10页
Building Science
基金
国家自然科学基金面上项目(52078374)
国家自然科学基金青年科学基金项目(52108090)
中国工程院战略研究与咨询项目(学部重点项目,2022-XZ-21)
上海市科委科技支撑碳达峰与碳中和专项(22dz1207800,22dz1207100)。
关键词
预制
装配式
元分析
碳足迹
减排
全寿命分析
precast
prefabrication
meta-analysis
carbon footprint
carbon reduction
life-cycle assessment
