Abstract: field application of lignosulfonate as a chemical additive for use in gypsum compositions. The influence of lignosulfonate on the physical and mechanical properties of pigmented plaster. The work studied the effect of lignosulfonate on properties of gypsum as strength properties, water absorption, softening coefficient and the changing colors of the material. Established that the application of lignosulfonate to a considerable extent not only improves the physico-mechanical properties of the material, but also its operational durability of pigmented gypsum, which expands the scope of these materials.

Keywords: lignosulfonate, pigmented plaster, physico-mechanical properties, strength properties, water absorption, coefficient of softening, change of color, long service life

Abstract: Among the variety of modern mineral binders occupy a special place gypsum binder, which has many positive properties: efficiency of production in comparison with cement, quick hardening, architectural expressiveness of features with the use of pigments, abundance of raw materials and high technology. However, its application is limited by low resistance of the material. The paper presents a brief analysis of the main methods of improving the water resistance developed at the moment in construction: increasing the density of products, improvement of water resistance by impregnating the surface of various materials, the use of various chemical additives, a decrease in the solubility in water of calcium sulphate, the use of combined methods of improving the water resistance, the creation of composite

Keywords: Keywords: gypsum binders, improvement of water resistance, impregnation, chemical additives, composite materials.

Abstract: the main applications of pigments in the building and abroad. This paper studied the influence of pigments on the physico-mechanical properties of gypsum - strength properties, water absorption, softening coefficient and the capillary suction material. It is established that one of the important characteristics of gypsum composite is a capillary suction material, which determines to a considerable extent not only the physico-mechanical properties of the material, but also its operational durability.

Keywords: Key words: pigments, physico-mechanical properties, strength properties, water absorption, softening coefficient, capillary leak, long service life