The article describes the design of buildings for multi-apartment houses 139 series, designed for construction in the conditions of the Kabardino-Balkaria Republic (KBR). An analysis of existing wall panel variants based on their thermal characteristics was carried out and a new constructive solution was proposed using porous fillers of KBR. The coefficient of thermal conductivity of the proposed structural concrete is determined analytically and the heat engineering calculation of the external wall panel is presented.
Selected composition of structural heat-insulating ash tuff concrete class B15-20 on tuff rubble and ash using plasticizer D5, determined the calculated heat transfer resistance of the two-layer structure, the dependencies of the density and strength of the mixture from cement consumption for 1 m3.
Objective. The study of the adhesion of reinforcement with tuff concrete on quartz sands, prepared both on ordinary Portland cement and expanding additives.Method. The solution is carried out by conducting an experiment, for this purpose, the manufacture and testing of tuff-concrete prisms with one centrally located reinforcing rod of a periodic profile of class A-400 was carried out, within the time limits established by the norms.Result. According to the results of the experiment, it was found that the adhesion of reinforcement to concrete is mainly determined by the compressive strength of concrete. The strength of the reinforcement's adhesion to concrete increases with the increase in the strength of concrete. In the studied compositions, the effect of the concentration of a large (tuff) filler or an expanding additive was not detected.Conclusion. The adhesion of reinforcement to concrete is largely determined by the strength of the concrete itself. The type of binder (the presence of an expanding additive) and the concentration of coarse aggregate do not significantly affect the adhesion of reinforcement to concrete. The dependence between the coupling of reinforcement during punching and the strength of concrete is revealed. An assessment (indirect) of the endurance and crack resistance of the coupling can be given by (the value of the conditional coupling) lsl, determined by the length of the visually visible cut of the consoles on concrete samples during penetration tests. In tuff-concrete of the studied compositions, the lcl decreases with an increase in the strength of concrete. In tuff concrete with RD, the endurance and crack resistance of the coupling turned out to be higher compared to tuff concrete on ordinary Portland cement.
The article is devoted to the study of the light concrete shrinkage deformations’ development patterns on porous aggregates of the volcanic tuff Kamensky deposit in Kabardino-Balkaria, prepared on quartz and tuff sands, using an expanding additive of sulfo-aluminate type in the amount of 12.5% Portland cement mass, the composition and amount of which was determined by the DSTU method.
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