Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

Calcium aluminate cement (CAC) is one of the alternative cements that is widely used for special applications. However, during the hydration process degradation of CAC microstructure, the so-called hydrate conversion process, hexagonal calcium aluminate hydrate (CAH10) transforms into a cubic (C3AH6...

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Bibliographic Details
Published in:Buildings (Basel) 2023-10, Vol.13 (10), p.2453
Main Authors: Win, Thwe Thwe, Panwisawas, Chinnapat, Jongvivatsakul, Pitcha, Pansuk, Withit, Prasittisopin, Lapyote
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminous cements
Aluminum silicates
Calcium
Calcium aluminate
calcium aluminate cement
Cement
Composition
Concrete
Conversion
Density
Fly ash
Hydration
Investigations
Manufacturing
Microstructure
Nanomaterials
Porosity
Scanning electron microscopy
Silica
Silicon dioxide
Temperature
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Summary:Calcium aluminate cement (CAC) is one of the alternative cements that is widely used for special applications. However, during the hydration process degradation of CAC microstructure, the so-called hydrate conversion process, hexagonal calcium aluminate hydrate (CAH10) transforms into a cubic (C3AH6) phase, resulting in increased porosity and reduced strengths. It is known that alternative means for stabilizing the CAC conversion are conducted by introducing fly ash (FA) in CAC, where its microstructure is attributed to aluminosilicates. However, no study has yet been conducted on different FA compositions influencing CAC performance. This study aims to evaluate the effects of different compositions of FA on CACs’ fresh and hardened characteristics. Results revealed that the microstructure was denser when CAC was mixed with FA. Regarding reactivity, CAC with calcium-rich FA systems is 13% faster than the silica-rich one. The higher the density and the lower the porosity of calcium-rich FA mixtures were found compared with silica-rich FA in both micro- and macro-structures. As seen in the microscopic structure, this is due to the calcium-rich phase formation.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings13102453