FAST-SETTING REPAIR MORTAR

Abstract

mixtures based on gypsum-cement-slag binder. 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. 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. The development and use of modern dry repair mixtures is an important step towards the effective restoration and modernization of the construction infrastructure of Ukraine. The paper analyzes the use of different grades of gypsum in repair mixtures, the ratio of gypsum-cement-slag binder and aggregate, as well as the water-binding ratio. With the help of mathematical planning of experiments, polynomial models of compressive and bending strength of repair mixtures at the age of 2 hours, 1 day and 28 days were obtained. Based on the obtained models, the influence of composition factors of repair mixtures on the studied properties was analyzed.