Heating Rate and Liquid Glass Content Influence on Cement Brick Dehydration

Abstract

Peculiarities of Portland cement dehydration in different hydrate phases with sodium water glass have been given. Three endoeffects were determined during non-isothermal heating, connected with ettringite dehydration and water extraction at temperature ranges 98.7–110.0 ℃, calcium hydroxide decomposition at temperature ranges 439.4–450.7 ℃ and secondary carbonates decomposition at temperature ranges 657.4–669.3 ℃. We experimentally proved that the rates of dehydration of hydrated Portland cement was significantly influenced by the liquid glass concentration. Optimum liquid glass content was grounded in the protective layer of composite finishing material, modified with low-temperature plasma.