Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 36, Issue -, Pages 779-786Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2012.05.028
Keywords
Colloidal nanosilica; High-volume fly ash; High temperature; Strength; Microstructure
Categories
Funding
- Universiti Kebangsaan Malaysia
- Ministry of Higher Learning Malaysia [FRGS/1/2011/TK/UKM/02/16]
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High-volume fly ash has been widely used in concrete to reduce the cost and environmental impact of producing cements. However, the effect of high temperature on cement-based materials containing fly ash and nanosilica has not been well characterized. In this study, cement was replaced by high-volume fly ash combined with colloidal nanosilica to produce high strength mortars with high residual strength after exposure to high temperatures of 400 degrees C and 700 degrees C. Heated and unheated specimens were subjected to flexural and compression tests. The samples were evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) tests; and their porosity were determined using BET (Brunauer, Emmett, and Teller) technique to study the specimens' behavior after exposure to high temperatures. High strength mortars can be produced using nanosilica and fly ash with resultant high residual strength, as confirmed by the porosity, XRD and TGA tests results. (C) 2012 Elsevier Ltd. All rights reserved.
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