Geopolymerization of class C fly ash: Reaction kinetics, microstructure properties and compressive strength of early age

被引：32

作者：

Mohamed, Rosnita ^{[1
,2
]}

Razak, Rafiza Abd ^{[1
,2
]}

Abdullah, Mohd Mustafa Al Bakri ^{[1
]}

Shuib, Raa Khimi ^{[3
]}

Subaer ^{[4
]}

Chaiprapa, Jitrin ^{[5
]}

机构：

[1] Univ Malaysia Perlis, Ctr Excellence CEGeoGTech, Geopolymer & Green Technol, Perlis, Malaysia

[2] Univ Malaysia Perlis, Fac Civil Engn Technol, Perlis, Malaysia

[3] Univ Sains Malaysia, Sch Mat & Minerals Resources Engn, Nibong Tebal 14300, Pulau Pinang, Malaysia

[4] Univ Negeri Makassar, FMIPA, Phys Dept, Geopolymers & Green Mat Grp, Makassar, Indonesia

[5] Synchrotron Light Res Inst, Muang 3000, Nakhon Ratchasi, Thailand

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2021年 / 553卷 / 553期

关键词：

Heat evolution; Calorimetry; Class C fly ash geopolymerization; Solid-to-liquid ratio; Nucleation mechanism; Microstructure properties; SETTING TIME; STRUCTURAL-ANALYSIS; RATIO; SODIUM; OPTIMIZATION; ACTIVATION; METAKAOLIN; HYDRATION; CEMENT; HEAT;

D O I：

10.1016/j.jnoncrysol.2020.120519

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页数：15

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