碳化养护混凝土生命周期环境影响的评估

doi:10.11896/cldb.23070186

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Abstract Considering that CO₂ curing for concrete can achieve high-value utilization and sequestration of CO₂, the life cycle environmental impact assessment of CO₂-cured concrete was studied here. Based on experimental investigations in existing literatures, datasets of the life cycle environmental impacts for CO₂-cured concrete were established, and then the carbon emissions were calculated. Based on the Monte Carlo simulation method, the uncertainty analysis of the influence of carbon emission coefficient of raw materials on the calculation results of environmental net benefit was studied. The results indicated that carbon emissions from the production process of cement and the curing process of concrete are key factors affecting the environmental benefits of CO₂-cured concrete. The results of uncertainty analysis showed that, among the 120 datasets, 21 datasets would produce positive environmental net benefits, and the other 99 datasets would produce negative environmental net benefits. Increasing CO₂ curing time or gas pressure could enhance the amount of CO₂ captured by concrete, but it could also increase the energy consumption of carbonation equipment, leading to excessive carbon emissions during the production process of CO₂-cured concrete. Excessive CO₂ curing time, high pressure and the resulted reduction of mechanical properties of concrete can lead to negative environmental net benefits of CO₂-cured concrete. Thus, based the calculation results in this work, it is recommended to use atmospheric pressure CO₂ curing for a duration of less than 6 h.

Key words： CO₂-cured concrete life cycle assessment environmental benefits curing regime Monte Carlo simulation

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TU375

Fund:National Natural Science Foundation of China (52341803) and Shenzhen Science and Technology Innovation Commission (CJGJZD20220517141806015).

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	Articles by authors
	GUO Bingbing
	CHU Jia
	WANG Yan
	NIU Ditao

Cite this article:

GUO Bingbing,CHU Jia,WANG Yan, et al. Life Cycle Assessment of Environmental Impacts of CO₂-cured Concrete[J]. Materials Reports, 2024, 38(24): 23070186-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23070186 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23070186

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