INCREASING THE ADHESION STRENGTH OF REPAIR MIXTURES BASED ON GYPSUM-CEMENT-SLAG BINDING AGENT

Abstract

The article examines the possibility of obtaining fast-hardening dry repair mixtures based on gypsum-cement-slag binder. It also explores the possibility of increasing the adhesive strength of fast-hardening repair mortars based on these binders using gypsum of varying strengths.. During its lifecycle, almost all concrete and reinforced concrete structures and  are exposed to aggressive environments, seismic, shock and other destructive effects that can cause damage and destruction of building structures, which leads to high demand of methods and materials for their restoration and protection from aggressive environments. This article examines the influence of mixture composition factors on the adhesion strength to two substrates—dense concrete and porous ceramic—is determined. Using mathematical design of experiments, a set of polynomial models of adhesion strength to the substrates under study is developed. Based on the resulting models, an analysis of the influence of compositional factors on adhesion strength is conducted. In the conditions of post-war reconstruction and restoration of the general infrastructure in Ukraine, the use of fast-setting dry repair mixtures allows faster and more efficient restoration of damaged buildings and structures. This contributes to the improvement of living conditions and the recovery of the country's economy.