By spent researches is established, that the products from a composite material on a basis gypsum and sulfur do not include in the structure potentially dangerous for organism of the person and environment of connections of mercury, thallium, selenium, arsenic; are chemically stable and do not allocate in inducing air, water and acid of environment unstable of inorganic connections. By manufacture of products on air environment of a working zone can be allocated hydrogen sulphide and sulphureous anhydride, that requires the appropriate organization of labour of the workers with maintenance of a premise by compulsory ventilation and measures of fire-prevention safety. Toxicological and hygienic studies of powdered sulfur gypsum material in case of cutaneous admission (50% vaseline emulsion) allowed to establish the following: after the first application of the paste, no visible changes were observed on the skin of animals. After ten applications in 2/3 of the experimental animals, pale pink erythema was observed throughout the paste application area. With further applications, the intensity of skin hyperemia did not increase. The resulting changes can be classified as a moderately pronounced skin irritating effect of powdered sulfur gypsum material. Analysis of the information obtained during the formulation of basophil degranulation reactions and specific agglomeration of blood leukocytes of guinea pigs sensitized with powdered sulfur gypsum material indicates the absence of statistically significant changes in the parameters of the studied reactions in animals of the experimental and control groups. This gives grounds for concluding that sulfur gypsum materials do not possess allergenic activity. Based on the conclusion of the Chief Sanitary Doctor of Ukraine, a composite material based on gypsum and sulfur is recommended for the manufacture of tiles that can be used in the construction of buildings of “B” and “V” groups (industrial and public buildings).

The paper considers the issues of obtaining a composite material based on gypsumbinder and sulfur with high performance. Technological factorsinfluencing the hardening coefficient, water resistance and chemical resistance of gypsum products impregnated in sulfur melt have beenstudied. The regularities of impregnation of gypsum matrix with sulfur melt are established takinginto account the capillary-porous structure of gypsum stone and physical and technical properties ofsulfur. The regularities of impregnation of gypsum matrix with sulfur melt are established taking intoaccount the capillary-porous structure of gypsum stone and physical and technical properties ofsulfur. Research and consideration of mass transfer indicators during impregnation of gypsumconcrete products with sulfur melt allowed to optimize the technology. Thus, by the method ofcapillary impregnation on the original laboratory installation, the mass transfer coefficients forsulfur were measured. As a result of these studies, the dependences of the mass transfer coefficienton the temperature of the sulfur melt, the rate of heating of the melt, the concentration of the fillerand the water-solid ratio were obtained. Products made of composite material based on gypsum andsulfur have the following construction and technical characteristics: compressive strength, not lessthan 30.0 MPa; flexural strength, not less than 6.0 MPa; water resistance coefficient, not less than0.7; coefficient of corrosion resistance, not less than 0.7; wear resistance, no more than 0.3 g / cm2 .Analysis of the main construction and technical characteristics of the composite material based ongypsum and sulfur shows that the resulting composite has high strength, water and corrosionresistance to various aggressive environments. Facing tiles made of this material have highperformance characteristics and should be used in the lining of buildings of railway infrastructure,drainage systems, fertilizer storage, floors and walls of the chemical and food industries.

The paper considers the issues of studying the structure formation of binders during hardening to determine the optimal moments of mechanical action on gypsum concrete specimens, which makes it possible to optimize the technology of their impregnation with sulfur melt. The time dependence of the elastic modulus of a hardening, binder is its important physicochemical characteristic, since it is used to objectively identify the stages of structure formation, to simulate the processes occurring at each of the stages. It is noted that the method of acoustic resonance of bending vibrations, in the case of hardening binders, needs correction with respect to the measurement technique and interpretation of the results obtained. The kinetics of the resonance frequency of a sample consisting of a rigid cell and a dispersion poured into it is a function of the elastic properties of the cell, the dispersion itself, the contact zone of the dispersion with cell and therefore cannot be used for either qualitative or quantitative analysis of the kinetics of hardening. Taking into account the elasticity of cuvette is necessary to obtain reliable information. It has been established that in the presence of shrinkage or significant expansion of the binder, the study of structure formation by the resonance method should be carried out in plastic cuvettes. Regardless of shrinkage, the use of a cuvette requires compulsory consideration of its elastic properties. It is advisable to objectively distinguish the stages of structure formation on the basis of the kinetics of not the dynamic modulus of elasticity itself, but the rate of its change. The time dependence of the logarithmic damping decrement is also an important characteristic of the concrete structure. The studies carried out make it possible to obtain serogypsum composites with the necessary performance characteristics and to manufacture elements of architectural décor, wall fencing products of increased aesthetics, durability and reliability from them.

The paper considers the issues of obtaining a composite material based on gypsum, fly ash and sulfur with improved performance. Regularities of impregnation of a gypsum sol matrix with a sulfur melt are established, taking into account the capillary-porous structure of the gypsum sol stone and the physical and technical properties of sulfur. The conducted studies make it possible to determine the sulfur mass transfer coefficient ams and the maximum sulfur-containing Us in impregnated products, depending on the initial values of the sulfur melt temperature, water-solid ratio and fly ash content. This allows to determine quickly and effectively the duration of impregnation to a given sulfur content for a specific composition and size of gypsum products. Technological factors influencing the hardening coefficient, water resistance and chemical resistance of gypsum ash products impregnated in sulfur melt have been studied. An analysis of the results shows that the strength of samples impregnated with sulfur increases while the degree of filling of the pore space with it is increasing. So, with increase in the relative sulfur content (v = Us / Usmax) from 0.30 to 0.90, the compressive strength increases from 10.1 to 42 MPa. It has been established that water resistance of the impregnated samples significantly depends on the degree of impregnation and the amount of fly ash. The experiments carried out give reason to believe that the material based on gypsum, ash and sulfur refers to waterproof materials, since the softening coefficient is higher than 0.7. It has been established that gypsum and gypsum samples impregnated with sulfur melt have a chemical resistance coefficient of at least 0.7, which allows them to be classified as chemically resistant. The resulting sulfur-gypsum composite is distinguished by high strength, water and corrosion resistance to aggressive environments of livestock complexes, food and chemical industries, where it should be used in the form of special facing products.