Multifunctional layered composite material used for construction purposes

Introduction. The adjustability of electrical properties of materials, that have hydraulic setting characteristics, has been studied over the last decades. It is emphasized that any change in electrical properties, triggered by various additives, causes negative side effects, including low corrosive resistance and modified physical and mechanical characteristics. The purpose of this research is to design a multifunctional layered material that features localized electrical conductivity. The objective is to track the influence of modifiers, capable of regulating electrical properties. Materials and methods. Samples were made of Portland cement I 42.5; the cement, having the fineness modulus of 0.7, was used as the aggregate; samples also contained ground Sulphur type 9998 (GOST 127.1-93), soot slurry, and calcium nitrate. The co-authors have identified the unit resistance values of each layer of this composite material, mechanical properties and features of each layer, and the structure of contact layers. Results. The co-authors have determined that the addition of pre-treated Sulphur in the amount of 7 % of the binder mass facilitates the formation of a nonconductive layer, whose unit resistance reaches 29.57 kiloohm cm on the 28th day. The conductive layer, generated by adding soot in the amount of 7 % of the binder mass, ensures the stable passage of electric current. The co-authors have identified that calcium nitrate influences the morphology of secondary crystalline hydrates and the non-crystalline phase of the mineral matrix, made of Portland cement, and it also ensures the required concrete strength. Conclusions. The layered method of formation of new compositions allows to make composite materials having adjustable electrical characteristics. New materials are made of Portland cement, and they contain no non-conductors. The co-authors have proven the efficiency of Sulphur, an integrated modifier made of soot and calcium nitrite, used as the modifiers of the mineral matrix, since they regulate the electrical properties of the artificial stone.