Abstract: Ultra high performance concrete (UHPC), even though a construction material with excellent performance is deemed to be unsustainable as per many opinions owing to its high cement content which raises the cost and pollution. This paper looks into the possibility of development of UHPC with high amount of cement replacement (around 70%) by two supplementary cementitous materials, slag and silica fume. The combination has been found to raise the early strength and late strength by approximately 10% and 17% compared to a control mix as opposed to low early strength development when only slag is used and lower late strength ( than the blended mix) when only silica fume is incorporated. The scope of this paper also covers the effect of curing method on strength development of the proposed UHPC mix and concludes that choice of curing medium and method highly influence strength development. It also addresses the optimal fineness combination of slag and silica fume which contributes highest strength. The promising point is that for a fixed water-binder ratio, even with such low cement content, concrete can show appreciable strength improvement when blended with two admixtures given that proper curing method and fineness of admixtures are properly chosen.
Keyword: Ultrahigh performance concrete, Silica fume, GGBS, Mineral admixtures, Fineness.
Title: Development Of Ultra High Performance Concrete Incorporating Blend Of Slag And Silica Fume As Cement Replacement
Author: Souradeep Gupta
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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