EFFECTS OF FLY ASH AND GROUND GRANULATED BLAST FURNACE SLAG ON THE RHEOLOGY OF FRESH CONCRETE
Abstract
The effects of different proportions of some Supplementary Cementitious Materials (SCM) such as fly ash (FA) and ground granulated blast furnace slag (GGBS) on the rheology of self-compacting concrete (SCC) mixes were investigated experimentally in this study. Six mix proportions of SCC were adopted in this investigation. Each mix proportion was designed from the control mix and comprised of either FA or GGBS or both (10% FA, 20% FA, 10% GGBS, 20% GGBS and 10% FA + 10% GGBS) based on partial mass replacement with Portland cement. To improve the workability of each mix and attain excellent flowability and rheological stability, a viscosity modifying admixture (VMA) and a superplasticizer were utilized. Each mix proportion's slump, dynamic yield stress, and plastic viscosity were determined and reported accordingly. The mix with 20% FA produced the most suitable results for SCC among the six mix proportions since it had a moderate plastic viscosity and low yield stress. It was also very workable, as there was no segregation. However, the mix with 20% GGBS yielded a concrete that could not be classified as SCC since it was highly stiff and had poor workability. Additionally, the concrete had to be compacted during the slump test. A similar conclusion was reached for the concrete mixture containing 10% FA and 10% GGBS.
KEYWORDS: Self-compacting concrete; Fly Ash; Ground Granulated Blast Furnace Slag; Workability; Rheology; Bingham model
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