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Geopolymerization of class C fly ash: Reaction kinetics, microstructure properties and compressive strength of early age
Journal of Non-Crystalline Solids ( IF 3.5 ) Pub Date : 2020-11-10 , DOI: 10.1016/j.jnoncrysol.2020.120519
Rosnita Mohamed , Rafiza Abd Razak , Mohd Mustafa Al Bakri Abdullah , Raa Khimi Shuib , Subaer , Jitrin Chaiprapa

The main objective in this study is to elucidate the geopolymerization of Class C fly ash at different solid-to-liquid ratio (1.0-3.0) by using heat evolution analysis. Differential Scanning Calorimeter was used to monitor heat evolution. The calculated heat evolved was utilized to analyze the reaction kinetics using Johnson-Mehl-Avrami-Kolmogrov Model and correlate with the compressive strength and microstructural properties encompassing morphology, functional group, phase analysis, and elemental distribution. The heat evolution was found to increase with increasing solid-to-liquid ratios. The nucleation mechanism of geopolymerization of Class C fly ash was governed by instantaneous heterogeneous nucleation with rod-like growth. Solid-to-liquid ratio of 2.5 was concluded as optimal ratio due to its great performance for strength development. Meanwhile the contribution of calcium (Ca) and iron (Fe) was confirmed due to the presence of Si-O-Ca and Si-O-Fe bonds in the functional group analysis, which was further confirmed by phase analysis and elemental distribution mapping.



中文翻译:

C级粉煤灰的地聚:早期反应动力学,微观结构性质和抗压强度

本研究的主要目的是通过热演化分析阐明C级粉煤灰在不同的固液比(1.0-3.0)下的地聚。差示扫描量热仪用于监测热量的释放。利用Johnson-Mehl-Avrami-Kolmogrov模型将计算出的热量用于分析反应动力学,并将其与抗压强度和微观结构特性(包括形态,官能团,相分析和元素分布)相关联。发现放热随着固液比的增加而增加。C类粉煤灰的地聚成核机理是由具有棒状生长的瞬时异相成核作用决定的。固液比2.5被认为是最佳比例,因为它具有出色的强度开发性能。

更新日期:2020-11-12
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