Application of a harmonized life cycle assessment method for supplementary cementitious materials in structural concrete
Application of a harmonized life cycle assessment method for supplementary cementitious materials in structural concrete
复制标题
结构混凝土辅助胶凝材料统一生命周期评估方法的应用
DOI：
10.1016/j.conbuildmat.2021.125850
复制
发表时间：
2022
影响因子：
7.4
通讯作者：
Tamina Tasmin
中科院分区：
文献类型：
--
作者：
Quddus Tushar;M. Bhuiyan;Guomin Zhang;T. Maqsood;Tamina Tasmin
用粉煤灰和矿渣等辅助胶凝材料 (SCM) 替代普通波特兰水泥 (OPC) 可以减少能源消耗，从而减少碳足迹。虽然有一些方法可用于评估可持续性，但大多数研究仅考虑一两个方面。由于缺乏整合和不确定性分析，决策者很难整合可能的机械、环境、经济和社会措施进行具体选择。因此，本研究对不同SCM配合比的混凝土力学性能进行回归分析和蒙特卡罗模拟。不确定性分析的概率分布表明，混凝土强度与水泥混合物 (r> 0.8) 的相关性高于矿渣 (r= 0.77) 和粉煤灰 (r= 0.63) 混合物的相关性。提出了生命周期影响评估统一方法（LCIA），从短期到长期的角度对人类健康损害（DALY）、生态系统损害（物种年）和资源可用性（美元）的影响进行分类，以兼顾环境和社会方面。单目标帕累托分析确定水泥的最佳替代量可以使用 20% 粉煤灰和 30% 矿渣。通过用 SCM 替代全球生产的 50% 水泥（4.1 吉吨），可以总共减少 2745 兆吨二氧化碳排放并节省 2090 亿美元资金，这可以为人类健康和生态恢复带来回报。
Substitution of Ordinary Portland Cement (OPC) with supplementary cementitious materials (SCMs), such as fly ash and slag, can reduce energy consumption, thus a consequent depletion in carbon footprint. While there are some methods available for assessing sustainability, most studies considered only one or two aspects. Due to a lack of integration and uncertainty analysis, it is difficult for decision-makers to integrate possible mechanical, environmental, economic, and social measures for concrete selection. Therefore, this study performs regression analysis and Monte Carlo simulations on mechanical properties of concrete with different mix proportions of SCMs. The probabilistic distribution of uncertainty analysis shows concrete strength has a higher association with cement mix (r> 0.8) than slag (r= 0.77) and fly ash (r= 0.63) mixes. Harmonized method of life cycle impact assessment (LCIA) has been presented to categorize impacts from short-term to long-term perspectives in terms of human health damage (DALY), ecosystem damage (species.year), and resource availability ($) to take care of both environmental and social aspects. Single objective Pareto analysis determines cement's optimum replacement can happen with 20% fly ash and 30% slag. A total reduction of 2745 megatons CO2and monetary savings of 209 billion dollars is feasible by replacing 50% of the produced cement globally (4.1 gigatons) with SCMs, which can be rewarded for human health and ecological recoveries.