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http://dx.doi.org/10.4334/JKCI.2013.25.3.305

Influence of Silica Fume on Strength Properties of Alkali-Activated Slag Mortar  

Kim, Tae-Wan (Research Institute of Industrial Technology (RIIT), Pusan National University)
Publication Information
Journal of the Korea Concrete Institute / v.25, no.3, 2013 , pp. 305-312 More about this Journal
Abstract
This paper reports the results of an investigation into the effects of silica fume on strength properties of alkali-activated slag cement (AASC) with water-binder (W/B) ratio and replacement ratio of silica fume content. The W/B ratio varied between 0.50 and 0.60 at a constant increment of 0.05. The silica fume content varied from 0% to 50% by weight of slag. The activators was used sodium hydroxide (NaOH) and the dosage of activator was 3M. The strength development with W/B ratio has been studied at different ages of 1, 3, 7 and 28 days. For mixes of AASC mortars with varying silica fume content, the flow values were lower than the control mixes (without silica fume). The flow value was decrease as the content of silica fume increase. This is because the higher surface areas of silica fume particles increase the water requirement. The analysis of these results indicates that, increasing the silica fume content in AASC mortar also increased the compressive strength. Moreover, the strength decreases with the W/B ratios increases. This is because the particle sizes of silica fume are smaller than slag. The high compressive strength of blended slag-silica fume mortars was due to both the filler effect and the activated reaction of silica fume evidently giving the mortar matrix a denser microstructure, thereby resulting in a significant gain in strength.
Keywords
alkali-activated slag cement (AASC); blast furnace slag; silica fume; strength;
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Times Cited By KSCI : 8  (Citation Analysis)
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