In this article is described a problem of increasing crack resistance of aerated cement concrete. Authors, having a model of concrete’s structure, made a disclosure of ratios for calculation of parameters the aerated concrete with disperse reinforcement. These ratios show data about change of structure parameters of aerated concretes with disperse reinforcement such as different density by variation of factors water-cement ratio, percent of reinforcement, ratio between dosing of cement and sand. Concrete’s cracking resistance was evaluated by compressive strength and parameter KIc. As result of experimental data processing authors got regression’s equations, which adequately describe changes of fracture toughness and compressive strength of aerated cement concrete (foam concrete) with density 1200 kg/m3 and 1400 kg/m3 in limits of factor area. There was shown a possibility of two-time increasing of fracture toughness and strength of aerated cement concrete with disperse reinforcement its structure by rough basalt fiber.
This paper considers the problem of resource-intensive production of selfcompacting concrete. The possibility of using the by-product of the production of nitrogen phosphorus potash (NPK) in the OJSC "Mineral fertilizers" of the city of Rossosh as a component of self-compacting concrete is assessed. Thus, the article solves the problem associated with resource saving, namely, it proposes an alternative to natural filler in the form of technogenic calcium carbonate, dumps of which occupy a huge area and bring incontestable harm to the environment. The results of experimental studies of water systems "limestone flour + water", as well as "technogenic calcium carbonate + water" are given. The dependence of the watersolid ratio on the amount of the dosage of various additives at a constant viscosity of the systems is established.
Physical and mechanical test methods for coarse aggregate have been studied under the commercial program of Egyptian and Russian standard test methods comparison. Theoretical and practical research has been carried out using Egyptian raw materials from reputed occurrences. The research shows that the main part of tests is either the same or comparable, which can make the quality assessment easier for both sides provided that the converting rules are followed. Recalculating methods for important geometrical and mechanical properties are proposed. Converting tables, graphics and Russian standards are provided in order to assist Egyptian suppliers with participating in tendering for Al Dabaa NPP project.
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