Document Type : Original Article
Authors
1
Department of Civil Engineering,Faculty of Engineering,,Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
2
Department of Civil Engineering, Faculty of Engineering, .Behbahan Khatam Alanbia University of Technology, Behbahan, ,Iran
3
Department of Mechanical Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, ,Iran
4
Department of Mechanical Engineering, Faculty of Engineering,.Behbahan Khatam Alanbia University of Technology, Behbahan, ,Iran
10.22065/jsce.2023.403066.3155
Abstract
Self-compacting concrete is widely used in buildings, bridges, industrial pavements and other structures. Due to the wide use of this material, many researchers have investigated its mechanical properties. Several factors influence the fresh and mechanical properties of self-compacting concrete, and heat transfer is one of these factors. Heat transfer is a vector quantity that occurs through conduction, convection and radiation. Heat transfer to solids is a mixture of molecular vibrations and energy transfer by free electrons. Heat transfer is from the molds to the concrete and the temperature increase of the molds affects the surrounding concrete. Therefore, the heat transferred to the molds from the air and its transfer to the concrete can cause crushing, flaking, cracking and reducing the final strength of the concrete. In this research, the numerical model of heat transfer with different types of molds to self-compacting concrete was investigated with ABAQUS software and the experimental results of the compressive strength of self-compacting concrete in polypropylene and ST37 steel molds. The numerical results showed that the transfer The heat from the polypropylene mold to the general environment of the self-compacting concrete and to its central core was reduced by about 61.50 and 62.66 percent compared to the St37 steel mold, and the average laboratory results of the final compressive strength of the concrete showed that the failure results from the uniaxial compression machine, Concrete in polypropylene mold increased by 8.49% and 7.28% compared to concrete in St37 steel mold during 7-day and 28-day curing. With the results shown from polypropylene mold, the effect of heat transfer, temperature and environmental factors can be seen and It reduces the self-compaction of concrete and its use in concrete structures leads to more durability and increased compressive strength compared to other form.
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