Modified gypsum binder for interior systems

¹ Karakalpak State University named after Berdakh, 230100, Academician Ch. Abdirov 1, Nukus, Karakalpakstan, Uzbekistan
² Moscow State University of Civil Engineering, 129337, Yaroslavskoye av. 26, Moscow, Russia
³ Russian State Geological Prospecting University, 117997, Miklukcho-Maklaya, 23, Moscow, Russia
⁴ Research Institute of Building Physics of the Russian Academy of Architecture and Building, 127238, Lokomotivny pr. 21, Moscow, Russia

^* Corresponding author: medvedev747@yandex.ru

Abstract

As the main component for many interior plaster mixes, a natural gypsum binder or its analogues is used, which are products of processing of local raw materials or by-products of other industries. Under operating conditions, gypsum binder-based plaster coatings have two main features. The first is the ability to regulate room humidity and absorb harmful emissions. The second is the ability to implement the function of barrier protection in the event of a fire. Improving the quality of plastering works and optimizing their cost is associated with the development of modified compositions based on gypsum, justified use of waste and local building materials, which include clay-gypsum binder. Clay gypsum as a natural material of sedimentary origin is widespread both in Russia and in the states formed in the post-Soviet space. In terms of energy intensity and manufacturability, the processing of raw materials into a clay-gypsum binder does not differ from the conditions of traditional processing of natural gypsum. Compared to lime or cement mortars, mortars based on gypsum binder have greater elasticity and plasticity. Such properties associated with the manufacturability of the application, such as workability and thixotropy, as well as the interval for maintaining the pot life of the mixture, are controlled by the introduction of modifying additives, the evaluation of the formulation of which was the purpose of the research, the results of which are presented in the article. The studies carried out have established that varying the recipe parameters make it possible to regulate both the strength and performance characteristics of mixtures based on gypsum plaster, as well as the manufacturability of their application.