Influence of silicon-containing additives on the property of the watertightness of concrete samples

The article examines the influence of silicon-containing additives on the property of water¬tightness of concrete samples. A literature review of common approaches and technologies improving the watertightness of concrete and reinforced concrete structures is given. Samples of normal hardening are obtained based on the concretes containing microsilica, aerosil or ash, or their combinations. This research is aimed at examining the influence of complex modifying agent comprised of metakaolin, superplasticizer and silicon-containing additives on the property of concrete watertightness. The necessity of using superplasticizers for the decrease in water-cement ratio and metakaolin as an early-strength admixture and hardener is shown. This article describes a part of the results of an experiment conducted to find alternative options for expensive illuvial additives used in concreting the foundations of private house-building. The implementation of scientific work will help clarify the matter and expand knowledge about such an additive as aerosil.