摘要
The physical-mechanical,chemical,and durability characteristics of alkali-activated materials(AAMs)have been widely investigated.However,a critical gap in the literature is the lack of a comprehensive overview of recently published literature regarding the life cycle assessment(LCA)of these binders.This study aims to fill that gap by conducting a systematic literature review of globally published literature on the topic.This paper consolidates knowledge by searching different databases,focusing on LCA studies that used AAMs as pastes,mortars,concretes,bricks,and rammed earth/soil blocks.The selected articles were reviewed and categorized based on precursors,alkaline activators,functional units,system boundaries,life cycle inventory databases,allocation,impact methodologies,and software used.Additionally,this paper also critically analyzes the key challenges of LCA for AAMs.The major challenges were identified as selecting a functional unit,subjectivity in boundary systems,and data interpretation.This work concludes that AAMs show substantial advantages in global warming potential compared to ordinary Portland cement-based materials;however,the average of other categories such as marine ecotoxicity and ozone layer depletion has been reported to be higher than for the reference samples.
碱激发材料(AAMs)的物化特性、力学性能与耐久性能已被广泛研究。然而,关于AAMs的生命周期分析(LCA)的最新报道,尚未进行全面回顾。因此,本研究旨在通过对全球范围内发表的有关该主题的文章进行系统的文献综述来填补这一空白。通过对不同数据库进行检索,本文筛选出使用AAMs作为净浆、砂浆、混凝土、砖和夯土/土块的LCA研究。筛选出的研究根据前驱体、碱活化剂、功能单元、系统边界、生命周期清单数据库、分配、影响方法和使用的软件等方面进行分类和回顾。此外,本文还对AAMs的LCA面临的关键挑战进行批判性分析,其中首要的难题是功能单元的选择、边界系统的主观性和数据的解释说明。研究表明,与普通硅酸盐水泥相比,AAMs在减缓全球变暖潜能方面有利,而在其他方面(如海洋生态毒性和臭氧层破坏)的潜能值高一些。
基金
supported by the Alexander von Humboldt Foundation,International Climate Protection Fellowship(Ref 3.5—1157991-IRN-IKS)
This financial support is gratefully appreciated by Morteza Nikravan.Rafia Firdous and Dietmar Stephan highly acknowledge Bundesministerium fur Wirtschaft und Energie(BMWi)for funding number 16KN046744.
