Abstract
Gypsum-based binder modified by clay has properties close to the gypsum binder and can be used as plaster formulations or mortars. There are several reasons and chief among them is the lack of scientific based theory of formation and hardening properties of gypsum-based binder modified by clay without additives and that modified by additives. One of the classic ways of studying the mechanism of hydration of gypsum binders is the analysis of the heat liberation: hydration heat of the binder. With the thermos method of determining the heat liberation the ambient temperature is constant and the temperature of the sample which was at the beginning of the experiment changes as a result of the released heat of hydration of the gypsum; heat exchange between sample and the environment. Heat transfer is minimized through the use of thermos technology and effective insulation. The article presents the results of studying the dynamics of heat liberation during hydration of gypsum-based binder modified by clay without additives, with addition of superplasticizer and with the addition of setting retarder. Results in all cases are satisfactory. The highest degree of hydration evaluated by kinetics of heat liberation from a binder is with the addition of the superplasticizer. Application of setting retarder somewhat reduces the maximum degree of hydration and increases the hydration time. The degree of hydration of the binder with the addition of C3 additive and retarder is observed to be higher than that of gypsum-based binder modified by clay without additives. The studies confirm the possibility of using gypsum-based binder modified by clay in the composition of dry plaster mixtures for interior decoration works in premises.
Highlights
Gypsum-based binder modified by clay is a natural material of sedimentary origin which is widespread within the Russian Federation and in Central Asia
Relief patterns were covered with gilding and the background was painted blue and decorated with fine floral patterns [5-8]
The final result depends on which is the greater: rate of heat liberation or rate of heat loss in the thermal environment
Summary
Gypsum-based binder modified by clay is a natural material of sedimentary origin which is widespread within the Russian Federation and in Central Asia. By its properties it is close to gypsum and can be used as its substitute in plaster and mortar [1-4]. In Central Asia clay-gypsum plaster finished with elegant ornamental or pictorial carvings was very popular decorative tool in the mosques and palaces and in people's houses. From the middle of the XV century it was applied on the walls of paintings called "kundal". Relief patterns were covered with gilding and the background was painted blue and decorated with fine floral patterns [5-8]
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