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Microstructure analyses of autoclaved ground dune sand-Portland cement paste

Alawad, Omer Abdalla and Alhozaimy, Abdulrahman and Jaafar, Mohd Saleh and Al-Negheimish, Abdulaziz and Abd Aziz, Farah Nora Aznieta (2014) Microstructure analyses of autoclaved ground dune sand-Portland cement paste. Construction and Building Materials, 65. pp. 14-19. ISSN 0950-0618

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Abstract / Synopsis

In this study, SEM, EDX, XRD, DAT and TGA are used to perform microstructure analyses of autoclaved ground dune sand–ordinary Portland cement (GDS–OPC) pastes. Pastes containing 0%, 10%, 20%, 30% and 40% GDS as cement replacement were prepared for this purpose. The microstructure analyses were used to examine the microscale changes that occur in the GDS–OPC pastes with increasing GDS replacement levels. The SEM and EDX results showed the clear formation of dense and newly formed thin crystalline calcium silicate hydrate with a low CaO/SiO2 ratio. The XRD, DTA and TGA analyses revealed that the portlandite phase had been eliminated. The microstructure analyses reveal how GDS contributes to the strength and physical properties of concrete.

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: 10.1016/j.conbuildmat.2014.04.040
Publisher: Elsevier
Keywords: Dune sand; Cement paste; Microstructure analysis; Autoclave curing
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 15 Dec 2015 16:09
Last Modified: 15 Dec 2015 16:09

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