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Title: Use of nano-silica to increase early strength and reduce setting time of concretes with high volumes of slag
Authors: Zhang, M.-H. 
Islam, J.
Peethamparan, S.
Keywords: Compressive strength
Pore-size distribution
Rate of cement hydration
Setting time
Silica fume
Issue Date: May-2012
Citation: Zhang, M.-H., Islam, J., Peethamparan, S. (2012-05). Use of nano-silica to increase early strength and reduce setting time of concretes with high volumes of slag. Cement and Concrete Composites 34 (5) : 650-662. ScholarBank@NUS Repository.
Abstract: The effects of nano-silica (NS) on setting time and early strengths of high volume slag mortar and concrete have been experimentally studied. Effects of NS dosages, size and dispersion methods on strength development of high volume slag mortars were also investigated. A constant water-to-cementitious materials ratio (w/cm) 0.45 was used for all mixtures. The results indicate that the incorporation of a small amount of NS reduced setting times, and increased 3- and 7-day compressive strengths of high-volume slag concrete, significantly, in comparison to the reference slag concrete with no silica inclusion. Compressive strength of the slag mortars were increased with the increase in NS dosages from 0.5% to 2.0% by mass of cementitious materials at various ages up to 91 days. The strengths of the slag mortars were generally increased with the decrease in the particles size of silica inclusions at early age. Ultra-sonication of nano-silica with water is probably a better method for proper dispersion of nano-silica than mechanical mixing method. © 2012 Elsevier Ltd. All rights reserved.
Source Title: Cement and Concrete Composites
ISSN: 09589465
DOI: 10.1016/j.cemconcomp.2012.02.005
Appears in Collections:Staff Publications

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