A Meta-analysis of Embodied Carbon Emissions of Prefabricated Buildings
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.
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