Research On Carbon Emission Evaluation In Prefabricated Building Materialization Stage

With the continuous improvement of our country's demand for building a resource-saving and environment-friendly society,the characteristics of traditional buildings with high energy consumption and high emission are unable to meet the needs of social development.Compared with traditional cast-in-place construction,prefabricated buildings have not only improved project quality,reduced the duration,but also have the advantages of saving resources,reducing energy consumption,and environmental protection.However,comparing with the United States,Japan and the United Kingdom,the development of prefabricated buildings in China is still facing the difficulties in evaluation,cost and technology.Therefore,to learn more about the carbon emissions of prefabricated buildings in its materialization stage and evaluate the carbon emission in a reasonable way is of great practical significant for the promotion of the prefabricated construction industry development.This paper mainly includes the following aspects:First of all,based on the literature review,this paper analysis the development of prefabricated buildings at home and abroad,and analyzes the theory of carbon emissions.Based on the analysis of the advantages and disadvantages of several comprehensive evaluation methods,and combined with the characteristics of prefabricated building,the research method of this paper is obtained.Secondly,the content of carbon emission evaluation in the materialization stage of prefabricated building is analyzed.In this paper,the materialized stage is divided into the factory production stage,the logistics transportation stage,and the assembly construction stage,and the influence factors of carbon emission in these stages are analyzed,including resources,energy,construction organizations,and construction waste.What's more,the carbon emission factors in the main building materials,energy,and machinery are identified through literature review.And the carbon emissions assessment process of the prefabricated building in the materialization stage is designed.Thirdly,according to the influencing factors of carbon emission in the materialization stage and the selected principle of evaluation index,the evaluation indexes of prefabricated buildings in seven latitudes are structured and explained,including investment amount,resource consumption,energy consumption,temporary land use,energy saving,construction organization and waste.And the carbon emission evaluation model of the prefabricated building in the materialization stage is established by the multi-level fuzzy comprehensive evaluation method.The calculation formula of the carbon emission in the materialization stage is designed according to the process of materialization stage.Finally,the paper takes Honghuiyuan Project in Shenyang as example to analyze the carbon emission with multi-level fuzzy comprehensive evaluation model.Based on the field investigation and the consumption quota of national project,the carbon emissions in the materialized stage were evaluated,and the carbon emissions in the materialization stage were calculated according to the formula of carbon emission.This proved the feasibility of carbon emission evaluation model.By comparing the evaluation results with those of traditional buildings,and analyzing the comprehensive benefits of carbon emission reduction in ecological,economic and social aspects,the necessity of promoting prefabricated buildings is reaffirmed.At the same time,the countermeasures and suggestions for carbon emission reduction control and management at all stages of materialization are put forward,which provide the decision-taking base for material selection and construction organization in prefabricated assembly building projects.