SCC matrix rheology with crushed aggregate fillers:effect of physical and mineralogical properties, replacement, co-polymer type and w/b ratio

Effect of different mineral fines (0-125 µm) from crushed and natural Norwegian sands on the rheological properties (Bingham’s yield stress τ0 and plastic viscosity µ) of filler modified cement pastes have been investigated at different cement replacement levels, w/b ratios and co-polymer types in a parallel plate rheometer. The parameter studies performed show considerable variations due to effects of the different fillers. The particle size distribution of the fillers (or the specific surface) has been shown to be highly important. Finer fillers tend to induce higher plastic viscosity and yield stress than the coarser fillers. However, surface effects related to different mineralogy and particle shape also seem to be important. The effect of which properties will prevail, seems to be dependent on the replacement level (when filler replaces cement), the superplasticizer type as well as the w/b ratio.