|Table of Contents|

Life cycle assessment on CO2 emission for biochar concrete(PDF)

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

Issue:
2023年03期
Page:
20-29
Research Field:
建筑材料
Publishing date:

Info

Title:
Life cycle assessment on CO2 emission for biochar concrete
Author(s):
WU Wei1; 2;  LU Yunan1; 3;  QIN Yinghong1; 2; 3;  XIE Jinli1; 2;  TAN Kanghao1; 2
(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China; 3. Guangxi Hualan Geotechnical Engineering Limited Company, Nanning 530001, Guangxi, China)
Keywords:
biochar concrete;  life cycle;  CO2 emission;  agriculture and forestry biomass
PACS:
TU528.01
DOI:
10.19815/j.jace.2021.11046
Abstract:
To evaluate the CO2 emissions of biochar concrete, life cycle assessment technology was used to construct a carbon emission calculation model for the production of biochar by biomass pyrolysis, a CO2 emission model for biochar concrete from raw material production to concrete demolition and abandonment, and a carbonation-absorption model for biochar concrete during service period. Meanwhile, the effect of biochar replacing cement in mass ratio on the mechanical properties of concrete was studied. On this basis, the CO2 emission for 1 m3 C30 biochar concrete were calculated and compared with that of ordinary C30 concrete. The results show that biochar is a carbon negative material and the higher carbon content, the better the CO2 reduction effect. When the replacement rate of biochar is less than 5.0%, the ultrafine carbon particles after grinding can give full play to the filling and internal curing effects and effectively improve the mechanical properties of concrete. The life-cycle CO2 emission of biochar concrete decreases with the increase of biochar replacement rate. Compared with ordinary C30 concrete, the CO2 emission of 1 m3 wood biochar concrete with 5% replacement rate can reduce 66.5 kg CO2 emissions with a reduction rate of 20.7%. During the service period of biochar concrete, the absorption of CO2 by carbonation accounts for 1.8%-2.5% of the total carbon emissions. However, due to the exponential growth of the specific surface area of concrete in the demolition and abandonment stage, the amount of carbonation absorption needs further study.

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Last Update: 2023-05-20