THE RHEOLOGICAL PROPERTIES OF CEMENT PASTES FORMULATED FOR SELF-COMPACTING CONCRETES WITH MULTIFUNCTIONAL MODIFIER
The rheological properties of cement pastes formulated for self-compacting concretes (SCC) were used to investigate the efficiency of multifunctional modifier on the properties of fresh and hardened concrete. It was found that the multifunctional modifier in the form of the concentrated suspension of silica fume in the solution of polynaphthalene sulfonate condensate superplasticizer and sodium hydroxide affects the rheological properties of cement paste, decreasing plastic viscosity and slightly decreasing the value of yield stress. The regularities of the influence of the rheological properties of cement pastes with organic-mineral modifier on the properties of fresh self-compacting concrete (flowability; T500 slump flow time; passing ability; resistance to segregation) were determined. An alkaline component of the multifunctional modifier allows to perform a partial replacement (35-45 %) of the Portland cement with ground granulated blast furnace slag.