The principles of creating of multimodal composite Portland cements with optimized void filling, that based on synergistic combination of ultrafine active mineral additives with superplasticizer were established. The optimization of multimodal multicompositе Portland cements was carried out and the relationship between the phase composition, microstructure and strength of the cement matrix were investigated.
The physico-chemical methods of the research of hydrated cement by mechanoactivated bonding substance with organo-mineral additive (microsilica + C-3) was presented. It was explored the influence of the additive into the kinetics of formation lowly basic calcium hydrosilicate.
In this paper prescriptions of dry building mixes for industrial floors were developed. Main indicators for such material are enough spreadability of fresh mixture during certain period of time, needed for its enclosing, high early strength, minimal deformation of hardened material. Technology of industrial floors construction in buildings with high loading is showed. Investigation of quartz sand with different granulometry on physical and mechanical properties of dry building mix for industrial floors is conducted.
Finishing mortars for decorative and protective facade coatings where natural kaolin is a major component were developed. The chemical and phase composition and microstructure of kaolin were investigated. Ultrafine kaolin (SSA = 1,58 m2/g) actively participates in the formation of phase composition and microstructure of the cement matrix of finishing mortars. Nanoscale systems of clay minerals due to plasticizing effect and filling influence provide improved adhesion-cohesive properties of finishing mortars.
The article examines the features of hardening and structurization processes of cement with high-energy self-tension. The physical-chemical methods of the research confirm that the use of the granulated expanding additive leads not only to an increase in expansion but also proves to form zones with different hydrated phases around granule
Microstructure of the dental alloy Ni-Cr-Mo (Rodent) after casting in the vacuum-pressure furnace has been examined. Chemical analysis by using energy dispersive spectroscopy as well as crystallographic orientations topography by using backscattered electron diffraction in the scanning electron microscope was carried out. It was found that after casting the microstructure consists of dendrites of solid-solution strengthened nickel–chromium matrix (γ phase). Inside the dendrites the precipitations of molybdenum silicides, eutectics γ–P and few particles of aluminum oxide were observed.
The influence of iron oxides on the properties of unfluoridated enamel glass frit and coatings in the system of Na2O – B2O3– SiO2 has been studied. It has been determined that the introduction of Fe2O3 additive in the amount of 0.4 mol % instead of SiO2 into an unfluoridated glass enamels improves the optical-color characteristics of the coatings, pigmented with selenium cadmium red.