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Information × Registration Number 0215U002377, 0110U007593 , R & D reports Title The influence of high temperature on crack stableness of concrete building construction popup.stage_title Head Parkhomenko Ruslan Vladimirovich, Registration Date 31-08-2015 Organization L'viv Fire State University of Vital Activity Safety popup.description2 The structure and volume. The work consists of introduction, 4 sections, vsnovkiv, a list of references with 159 items, presented on 44 pages of printed text and contains 15 figures, 3 tables; source list 15 pages. With increasing temperature indicators fracture, compressive strength, marginal basins that corresponds to the defragmentation of concrete, reduced compared to normal concrete hardening (basic series). The reason for this can be considered the formation of cracks due to occurrence of stress and strain gradients at the borders dividing phases and components of concrete due to different values of the coefficient of linear thermal expansion component of concrete. With increasing temperature of heat exposure intensity of these processes deepens. Fully equilibrium diagram of deformation (PRDD) concrete series "200" indicate the modulus of elasticity of concrete falling from the baseline series 1.5 times, while the 21% increase in energy elastic deformation (We) and the value of the total energy consumption for subcritical deformation (Wi) 16% compared with the concrete base series. Concrete, when heated to a temperature of 673 K (Series "400"), restores the elastic properties of the concrete base to the series. Configuration PRDD almost repeats PRDD base series with decreasing ordinates break point approximately 1000 N. Heating to 873 K qualitatively changes the configuration diagram deformation. At that moment descending branch and therefore concrete is not available under supercritical deformation. At the time of formation macrocrack concrete destroyed by instant defrag. At a temperature of 1073 K concrete structure is completely destroyed, as evidenced by asymptotic approximation to the original branch charts horizontal axis, approaching energy and power characteristics of crack resistance and compressive strength of concrete to zero. Product Description popup.authors Яковчук Роман Святославович popup.nrat_date 2020-04-02 Close