再生混凝土绿色建筑碳排放评价及灰色参数敏感性分析

In order to study the impact of green building made of recycled aggregate concrete (RAC) on the greenhouse effect carbon emission, life cycle assessment method was used to construct the life cycle carbon emission calculation boundary and calculation model for recycled aggregate concrete buildings.The sensitivity of the key parameters affecting carbon emission is analyzed by using the Deng's grey correlation theory.Based on a planned constructed recycled aggregate concrete green building, the designed water-to-cement ratio, recycled coarse aggregate(RCA) replacement ratio and aggregate transport distance were selected as the changing parameters to calculate their life cycle carbon emission and sensitivity.The carbon emission characteristics of different building materials at various stages were analyzed.With respect to the planned constructed recycled aggregate concrete green building, the optimization design of life cycle carbon emission was performed by considering the principles of economic benefits and mechanical properties of RAC.Results show that the calculation model boundary of life cycle carbon emission can be divided into 7 stages, i.e., raw materials production stage, raw material transportation stage, processing stage, finished products or components transportation stage, construction stage, building operation stage, and demolition stage.In the life cycle, the element most sensitive to the carbon emission is the designed water-to-cement ratio, and the following one is the transport distance, and the smallest sensitive one to the carbon emission is the RCA replacement ratio.