Comparison between slag- and silica fume-modified grouts

The effects of silica fume and ground granulated blast furnace slag on rheology and hardened properties of superplasticized grouts were studied. Silica fume and slag improved impermeability, strength, and wet-dry durability of grouts. The physical and mechanical properties of slag- and silica fumes-modified grouts compared favorably with those of grouts prepared with Type II an V cements. Silica fume was found to have a more pronounced impact on shear stress-shear rate relationships than slag. Gel strength was decreased by slag and increased by silica fume. The rheological properties of the grouts were sensitive to the sequence of superplasticizer addition. Slag- and silica fume-modified grouts are suitable for use in structural and environmental applications.