Life Cycle Assessment of Environmental Impacts of CO2-cured Concrete
GUO Bingbing1,*, CHU Jia1, WANG Yan2, NIU Ditao1
1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2 School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
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.
通讯作者:
* 郭冰冰,西安建筑科技大学土木工程学院副教授、硕士研究生导师。2012年河南工业大学土木工程专业本科毕业,2014年哈尔滨工业大学土木工程专业硕士毕业,2018年哈尔滨工业大学防灾减灾及防护工程专业博士毕业后到西安建筑科技大学工作至今。目前主要从事混凝土耐久性、低碳混凝土等方面的研究工作。发表SCI论文30余篇,包括Journal of Colloid and Interface Science、Cement and Concrete Composites、Construction and Building Materials、Journal of Materials in Civil Engineering等。 guobingbing212@163.com
引用本文:
郭冰冰, 储嘉, 王艳, 牛荻涛. 碳化养护混凝土生命周期环境影响的评估[J]. 材料导报, 2024, 38(24): 23070186-10.
GUO Bingbing, CHU Jia, WANG Yan, NIU Ditao. Life Cycle Assessment of Environmental Impacts of CO2-cured Concrete. Materials Reports, 2024, 38(24): 23070186-10.
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