Comparing the effects of oxidation heat treatment and lithium enrichment on the corrosion resistance of basalt glass fiber

Abstract

Chemical modification of the surface of basalt glass fiber has been considered, including diffusion-mode oxidation without formation of new crystalline phases and ion-exchange lithium enrichment. The effect of such a modification on the appearance of new surface formations during the hardening of composites that consist of the modified fiber and model nonorganing binding materials (mixtures of Ca₃SiO₅ and Ca₃Al₂O₆ with water) has been analyzed. It has been shown that both ion-exchange lithium enrichment and diffusion-mode oxidation change the composition and the morphology of hydrosilicate and hydroaluminate particles that are formed on the surface from “individual hydraulically active phase–water” mixtures. They have also been shown to change the morphology of the very fiber that is in contact with the liquid phase of the binding material.