Environmental impact of recycled coarse aggregate preparation process based on LCA
To explore the environmental impact of the preparation process of recycled coarse aggregate(RCA),life cycle assessment method was adopted to evaluate the whole process of RCA.Based on the preparation system of RCA and natural coarse aggregate(NCA),energy input and pollutant output in each stage of the system were established,and the environmental impact of RCA and NCA at each stage was calculated and compared.Furthermore,the relationship between aggregate transport distance and environmental impact is established,and determine the critical value of raw material transport distance affecting the environmental impact of RCA.The results showed that the human health damage caused by the preparation process of RCA was the largest.The human health damage caused by the preparation process of RCA and NCA with the transport distance of 80 km accounted for 52.48％and 47.46％of the total environmental impact respectively.During the preparation process of RCA,the environmental impact at the transport stage was the largest,the environmental impact at the transport stage of RCA at the transport distance of 15 km and 80 km accounted for 67.65％and 91.78％of the total environmental impact,respectively.When the raw material transport distance of RCA is less than 17.15 km or the raw material transport distance of RCA and NCA is the same and less than 34.18 km,the aggregate manufacturer can choose to prepare RCA with similar quality to NCA.
recycled coarse aggregatematerial transport distancelife cycle assessmentenvironmental impact
万方数据
维普
