THE INCREASING OF CORROSIVE RESISTANCE OF CEMENT COMPOSITES BY ACTIVE ADDITIVES

The object of the study is cement composites with active mineral additives. Additives promoting corrosion resistance of composites are considered. Some are active to cement dough, others - to aggressive environments. Additives active to aggressive media can crop out to the surface of composites and react with penetrating media. The results of the research revealed possible mechanisms of physical and chemical interaction of additives with aggressive media. The samples were cured by steaming and under normal conditions. Examples of results of acid resistance study of cement composites with additives are given. The acid resistance of cement stone with the product of cement decay in sulfuric acid was compared with the results obtained in the test of cement stone with 10% marshalite content. And the index of resistance of fine-grained concrete with aggressive additives, with barium chloride and stroncium, was compared with the results of testing concrete without additive and containing diatomite. According to the studies carried out cement stone with marshall has higher initial strength. However, cement stone with the addition of corrosion product has higher strength and resistance after exposure in aggressive media. It has been shown that the corrosion resistance of the steamed cement stone in 2% sulfuric acid solution, both with and without additive, is significantly higher than that of the normal hardening stone.

cement composites, hardening, heat and moisture treatment, normal conditions, corrosion resistance, mineral additives, diatomite, active additives, acid resistance