Effect of Autoclave Curing on the Microstructure of Blended Cement Mixture Incorporating Ground Dune Sand and Ground Granulated Blast Furnace Slag

Investigating the microstructure of hardened cement mixtures with the aid of advanced technology will help the concrete industry to develop appropriate binders for durable building materials. In this paper, morphological, mineralogical and thermogravimetric analyses of autoclave-cured mixtures incor...

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Bibliographic Details
Published in:International journal of concrete structures and materials 2015, 9(3), 28, pp.381-390
Main Authors: Alawad, Omer Abdalla, Alhozaimy, Abdulrahman, Jaafar, Mohd Saleh, Aziz, Farah Nora Abdul, Al-Negheimish, Abdulaziz
Format: Article
Language:English
Subjects:
Building Materials
Engineering
Solid Mechanics
Structural Materials
토목공학
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Summary:Investigating the microstructure of hardened cement mixtures with the aid of advanced technology will help the concrete industry to develop appropriate binders for durable building materials. In this paper, morphological, mineralogical and thermogravimetric analyses of autoclave-cured mixtures incorporating ground dune sand and ground granulated blast furnace slag as partial cementing materials were investigated. The microstructure analyses of hydrated products were conducted using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), differential thermal analysis (DTA), thermo-graphic analysis (TGA) and X-ray diffraction (XRD). The SEM and EDX results demonstrated the formation of thin plate-like calcium silicate hydrate plates and a compacted microstructure. The DTA and TGA analyses revealed that the calcium hydroxide generated from the hydration binder materials was consumed during the secondary pozzolanic reaction. Residual crystalline silica was observed from the XRD analysis of all of the blended mixtures, indicating the presence of excess silica. A good correlation was observed between the compressive strength of the blended mixtures and the CaO/SiO 2 ratio of the binder materials.
ISSN:1976-0485
2234-1315
DOI:10.1007/s40069-015-0104-9