Microsilica and Plasticizing Admixtures Influence on Cement Slurry Dilatancy

Cement slurries and concrete mixtures have dilatant behaviour in their flow. This has negative influence on the mixtures transportation by concrete pumps. Therefore, it is important to know the factors that have effect on the mixtures dilatancy. The influence of microsilica and plasticizing admixtures on mixtures dilatancy is investigated in this work. Rheological properties of the mixtures were tested with a rotating viscometer with coaxial cylinders. Two indexes of mixtures dilatancy were evaluated as well investigation results of show that microsilica additives increase yield stress of cement slurry and reduce its viscosity and greatly reduce dilatancy of cement slurry due to its particles fineness and its spherical shape. Microsilica suspension with complex used with plasticizing admixtures has different effect on the dilatancy depending on chemical composition of admixture