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A review: Reaction mechanism and strength of slag and fly ash-based alkali-activated materials

期刊

CONSTRUCTION AND BUILDING MATERIALS
卷 326, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126843

关键词

Slag and fly ash-based alkali-activated materials; Reaction mechanism; Strength control factors

资金

  1. China Scholarship Council [201806370216]

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In this paper, the mechanical properties and reaction mechanisms of alkali-activated materials such as blast furnace slag (BFS-AAM), fly ash (FA-AAM), and the combination of BFS and FA (BFS/FA-AAM) are reviewed. The factors influencing the strength of these materials and the control factors are summarized. The study reveals that ion concentrations determined by the control factors play a decisive role in strength development.
Alkali-activated materials (AAM) are known to be environmentally friendly alternatives to cement-based materials because they can potentially reduce greenhouse gas emissions and reutilize industrial by-products/wastes. To study the factors influencing the strength of slag based alkali-activated materials (BFS-AAM), fly ash based alkali-activated materials (FA-AAM), slag, and fly ash-based alkali-activated materials (BFS/FA-AAM), and clarifying their reaction mechanisms, this paper reviews current knowledge about the mechanical properties and the reaction mechanisms of BFS-AAM, FA-AAM, and BFS/FA-AAM. The precursor requirements and the strength control factors are summarized. The control factors for the strength of BFS/FA-AAM are the BFS/binder ratio, the Na2O/binder ratio, the SiO2/Na2O ratio, and the w/binder ratio. Ion concentrations, determined by these control factors, play a decisive role in the development of strength. Generally, the strength is proportional to the BFS/FA ratio. The optimal values of the Na2O/binder ratio of BFS-AAM and FA-AAM are between 5.5% and 8% and between 7 and 10%, respectively. The optimal values of the SiO2/Na2O ratio of BFS-AAM and FA-AAM are between 0.85 and 1.4 and between 0.6 and 1, respectively. Increasing the w/binder ratio will only benefit workability but will affect the strength negatively. A w/binder ratio of around 0.4 may strike a balance between strength and workability.

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