|Table of Contents|

Researches on carbon emission factors of recycled concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
1-11
Research Field:
建筑材料
Publishing date:

Info

Title:
Researches on carbon emission factors of recycled concrete
Author(s):
XIAO Jianzhuang1;  GUAN Xiangshuo1;  WANG Dianchao1;  WANG Jun2
(1. Department of Structural Engineering, Tongji University, Shanghai 200092, China; 2. China West Construction Group Co., Ltd, Chengdu 610017, Sichuan, China)
Keywords:
recycled coarse aggregate concrete;  recycled fine aggregate concrete;  recycled powder concrete;  carbon emission factor;  demonstration project
PACS:
TU528.01
DOI:
10.19815/j.jace.2022.07032
Abstract:
The accounting boundary of carbon emission factors of recycled concrete was defined, the calculation methods of carbon emission factors of recycled coarse aggregate concrete(RAC), recycled fine aggregate concrete(RFC)and recycled powder concrete(RPC)were proposed, and the influences of recycled material replacement percentages and concrete strength grades on carbon emission factors of recycled concrete were analyzed. Based on an actual case, the carbon emission reduction of recycled coarse aggregate concrete buildings compared with conventional concrete buildings was calculated, and the carbon emission advantages of recycled structure were analyzed. The results show that with the increase of recycled coarse aggregate replacement rates, the RAC carbon emission factors can be reduced by 15%. With the increase of recycled fine aggregate replacement rates, RFC carbon emission factors can be reduced by 8.6%. With the increase of recycled powder replacement rates, the carbon emission factors of RPC can be reduced by 26.3%. The carbon emission factor of C45 RAC is 11.7% higher than that of C30 RAC, the carbon emission factor of C45 RFC is 39% higher than that of C40 RFC, and the carbon emission factor of C45 RPC is 10.9% higher than that of C30 RPC. As the strength grades of concrete increase from C30 to C45, the carbon emission factors gradually increase. Within the boundary of “building material production + structural operation”, the RAC building reduces carbon emissions by 1.75% compared with the conventional concrete building. As far as the demolition project is concerned, the carbon emission reduced by avoiding the transportation and landfill of demolition waste is 3.32 times as much as the carbon emission reduced within the boundary of “building material production + structural operation”, which is the main reason for the favorable impact of recycled buildings on the environment.

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Last Update: 2023-07-01