Effective Silicate Concretes Properties Using Components of Ultrafine Range

Abstract

The article presents an assumption that the introduction of the traditional lime-silica astringent of aleuropelitic rock of the Ishim suite of the south of the Tyumen region allows to change the structure and phase composition of the silicate matrix. The applied rock is represented by quartz, sodium-potassium minerals of feldspars with an insignificant amount of chlorites and halloysite with grain sizes from 1 to 35 microns (μm). The peculiarities of the dispersion and grain composition of the raw material impact on the compactability of the silicate mass and the plastic strength of the as-formed raw material are studied. It is revealed that during the processes of hydration interaction of the components of the mixture with the use of aleuropelite, the main products are xonotlite, low-basic hydrated silicates and a small amount of Portlandite. Due to high alkalinity of the medium, finely dispersed feldspar minerals acquire reactivity with the formation of hydro- and aluminosilicate phases. The influence of aleuropelites on the degree of compaction of the raw material mass and the processes of physicochemical interaction under hydrothermal conditions make it possible to increase the strength and water resistance of silicate concrete.