INFLUENCE OF THE LOAD TRANFERENCE METHOD ON SHORT TUBE CONCRETE ELEMENTS FILLED WITH HIGH-STRENGTH CONCRETE Dr. sc. sciences L.I. Storozhenko, docent D.A. Yermolenko, graduate student O.V. Demchenko У статті наведено результати експериментальних досліджень коротких центральностиснутих конструктивних елементів із сталевих труб заповнених високоміцними бетонами залежно від передачі навантаження. Визначено несучу здатність, відносні деформації і встановлено характер руйнування залежно від способу завантаження та міцності бетонного осердя. Наведено характеристики застосованих матеріалів, зокрема розроблених складів високоміцних бетонів. Ключові слова: трубобетон, високоміцний бетон, несуча здатність В статье приведены результаты экспериментальных исследований коротких центрально-сжатых конструктивных элементов из стальных труб заполненных высокопрочными бетонами в зависимости от метода передачи нагрузки. Определено несущую способность, относительные деформации и установлен характер разрушения в зависимости от способа загрузки и прочности бетонного ядра. Приведены характеристики применяемых материалов, в частности разработанных составов высокопрочных бетонов. Ключевые слова: трубобетон, высокопрочный бетон, несущая способность.This article deals with advantages and disadvantages of use of concrete filled with steel tube structures with cores of high-strength concrete. Characteristics of used materials are shown, including the physical and mechanical properties of high-strength concrete compositions designed with using the local materials. Results of experiments of short centrally compressed structural elements of steel tubes filled with high-strength concrete and according to the load transference onto complex cross-section and concrete core are presented. It has been determined the capacity relatively the deformations and it has been found the fracture character according to the way of loading and concrete core strength. The method of transference of the load results in efficiency of tube concrete element from the high strong. Load transfer method impacts the efficient of high-strength concrete filled steel tubes structure element. Carrying capacity of test samples N1 increased by 8 -20% when load is transferred to concrete compared to complex cross-section. Longitudinal deformation decreases during the load transfer onto concrete core compared to complex cross-section load transfer.
Abstract. This article deals with the influence of cement quantity, plasticizing additives and compaction time on the strength and water consumption of concrete during its manufacturing using bottom ash from a thermal power station. The study was carried out using three factorial experiments. Variables varied on three levels. The obtained pattern functions characterize a relationship between strength, water consumption and variable factors. These factors include cement quantity, plasticize additives and compaction time. Compilation of Pareto effect charts allowed estimation of the significance of function indexes. Analysis of surface pattern function has revealed the optimal correlation between additive quantity and compaction time, cement quantity and additive quantity, cement quantity and compaction time. Compression strength of concrete was taken as the pattern in the pattern function. When analyzing the pattern function with water consumption as a pattern, optimal correlations between additive quantity and compaction time, cement quantity and additive quantity, cement quantity and compaction time were revealed. Application of STATISTICA 12 software has specified values of factors when the maximum strength is achieved. Correlations of components which have an impact on water consumption have been determined. The conclusions contain the quantitative findings of the study.
This paper presents the most optimal compositions of light concrete utilizing bottom ash for manufacturing the energy efficient wall products. Bottom ash usage as a filler instead of quartz sand acts as utilization of wastes which has a positive impact on ecology. It's been experimentally investigated the influence of the amount of cement and water on strength, density, water consumption, and thermal conductivity of light concrete manufactured using the bottom ash from thermal electrical stations as a filler. Using the STATISTICA 12 software there were obtained the precise values of coefficients that allow achieving the maximum strength. It's been manufactured the energy efficient wall blocks based on bottom ash with the concrete compression strength class of LC 20/22. The conclusions quantify the results of these studies.
This paper addresses the issue of the influence of cement consumption, plasticizing additive, and compaction time on the strength and frost resistance of concrete manufactured with bottom ash slags from thermal power plants. The investigation was carried out using the three-factor experiment with variables varied at three levels. There were received response functions, which characterize the correlation between frost resistance and variables: cement consumption, plasticizer additives and compaction time. An analysis of the surface of the response function, where the frost resistance of the concrete was accepted as a response, revealed the optimal correlation between the components of the mixture and the compaction time of the seal. By using the STATISTICA 12 software complex, the values of the factors were specified, when the optimal components ratio with GLENIUM 51 superplasticizer is achieved for the production of concrete with high frost resistance that is greater than F300. The conclusions quantify the results of the investigation.
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