The Research On Comprehensive Evaluation System Of Green Building Materials Based On LCA-LCC

Building materials industry is an important basic industry of the national economy.It is an important support for improving living conditions,harnessing ecological environment and developing circular economy.But it is also an industry with high pollution and consumption.With the rapid development of economy,industrialization and urbanization,the building materials industry keeps a steady development.A large number of new building materials and decoration materials emerge as the times require,causing serious pollution to the external environment,especially indoor environment,and seriously threatening human health.How to establish a set of comprehensive evaluation system for practieal green building materials has become one of the most concerned research directions.In this paper,seven types of building materials,such as masonry materials,thermal insulation materials,ready-mixed concrete,building energy-saving glass,ceramic bricks,sanitary ceramics,ready-mixed mortar,are taken as the research objects.Based on the theory of life cycle assessment(LCA),life cycle cost analysis(LCC),analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method,the AHP-fuzzy comprehensive evaluation method based on LCA-LCC is established by referring to the existing green evaluation methods of building materials and buildings,and the single factor evaluation method is combined to evaluate the green character of building materials.The main research work in this paper is as follows:In view of the limitations of LCA evaluation,this paper uses LCA-LCC integrated method to evaluate the green character of building materials,and makes a comprehensive evaluation of the economic cost and environmental impact of building materials to make up for the shortcomings of LCA evaluation.The evaluation steps of LCA-LCC integrated method are the determination of purpose and scope,the quantification calculation of inventory,the integration of inventory,the AHP-fuzzy comprehensive evaluation method,the evaluation of green comprehensive evaluation and the interpretation of results.Based on the latest relevant environmental protection tax levy standards of Hunan Province,this paper calculates the input and output costs of LCA-LCC for building materials by using social willingness to pay method in the LCA-LCC inventory integration.In this paper,the evaluation indicators are divided into two categories:control index and scor:ing item.Based on the current research on the evaluation index system structure and construction method of building materials,as well as the requirements of building materials on technology,performance,economy and life cycle environmental impact,aiming at the defects of inconsistent evaluation index system of building materials,a unified comprehensive evaluation of items for all building materials is constructed.The improved population AHP method is used to calculate the weights of evaluation indicators at all levels.Aiming at the scale defect of AHP,this paper improves the AHP scale method and constructs the judgment matrix by using the index scale of 30/4?38/4 to improve the accuracy of the weight calculation result and the discrimination of the index value of the judgment matrix.The evaluation method is applied to comprehensively evaluate the green character of six representative masonry materials.The evaluation results are consistent with the actual situation of masonry materials,which proves the practicability and scientificity of the evaluation method.