Carbon Emission Calculation Of Aerated Concrete Composite Insulation Exterior Wall Panel Based On LCA

At present,"carbon peak and carbon neutrality"has been mentioned at the national strategic level.The emission reduction demand of the construction industry is increasing day by day,and how to effectively calculate the carbon emission of buildings and scientifically evaluate the carbon level of buildings is an urgent problem to be solved.Promoting the development of building industrialization is an important measure of energy conservation and emission reduction in the construction industry.Quantitative analysis of carbon emissions of prefabricated components can be used to quantitatively calculate carbon emissions of prefabricated buildings and effectively evaluate the benefits of building energy conservation and emission reduction,which meets the needs of industry development.As the main component of the outer protective structure,the exterior wall panel of prefabricated building is the focus of energy conservation and emission reduction research.The aerated concrete composite insulation exterior wall panel developed by our research group is a new type of prefabricated exterior wall panel,which has the advantages of high industrialization,good thermal performance,convenient construction,etc.,and has been popularized and applied in engineering practice.Therefore,the study on carbon emission calculation and emission reduction strategy of aerated concrete composite insulation exterior wall panel based on the whole life cycle is conducive to promoting energy conservation and emission reduction in the construction field and promoting the sustainable development of prefabricated buildings.This thesis introduces the concept and framework of LCA theory,summarizes the carbon emission measurement methods commonly used at present,and collects the carbon emission factors required by the literature.The study area of carbon emission in the whole life cycle of prefabricated wallboard was defined and the life cycle stage of prefabricated wallboard was determined.Based on the carbon emission factor method,the carbon emission calculation framework of the whole life cycle was established,and the carbon emission calculation formula of each stage was established.The carbon emission estimation boundary of composite insulation wall panel was determined.The carbon emission of aerated concrete wall panel(ALC)in the production stage was calculated by field investigation data.The carbon emission of150-thick B05 grade ALC in the production stage was 54.245kg CO2e/m~2.On this basis,the life cycle carbon emissions of 250 thick composite wallboard(150 thick B05 grade ALC+5 thick bonding mortar+60 thick XPS+35 thick vitrification microbead insulation slurry)were calculated,and the life cycle carbon emissions were 241.733kg CO2e,among which the carbon emissions in physicochemical stage accounted for 35.25%.The proportion of carbon emissions in the service and maintenance stage(50 years of life)was 64.61%,and that in the demolition and recycling stage was 0.14%.The carbon emission of composite wallboard with B05ALC wallboard as base plate,different plate thickness,different insulation material and different insulation layer thickness in the production stage was calculated.The carbon emission database of composite wallboard was formed to provide data reference for carbon emission calculation of prefabricated wallboard engineering.Based on the analysis of the life cycle data of composite wallboard,the corresponding strategies of energy saving and carbon reduction are put forward.Taking the composite wallboard application project in Jinan City as the research object,the carbon emission of the whole life cycle of the building is calculated.The data list of the physical and chemical stage is all from the project Bill of Quantities,which is calculated by using the carbon emission factor method,and calculated by using the Svere CEEB building energy consumption and carbon emission calculation software in the maintenance stage.The carbon emissions of composite thermal insulation exterior wall panel in physicochemical stage accounted for 25.90%of the total carbon emissions of the building outer protective structure.The carbon emission of composite wallboard in the whole life cycle of the building is 5.3%.In the same thermal condition,the carbon emission of composite insulation exterior wall panel,ALC plastered exterior wall system and precast concrete sandwich insulation exterior wall panel system in the whole life cycle is compared and analyzed.The analysis results show that:in the whole life cycle of the wall board,the low carbon performance of the aerated concrete composite insulation wall board is better than the other two kinds of wall board system,the results show that the composite insulation wall board in building emission reduction advantages.