Temperature Effect on the Mechanical Properties of Very High Performance Concrete

Abstract:

This study aims at a better understanding of the behaviour of very high performance concretes (VHPC) subjected to high temperatures. The temperature increase within the concrete originating from the hydratation exothermic reaction of cement is emphasized by the mass effect of the structures and can lead to thermal variations of around 50°C between the heart and the structures walls. These thermal considerations are not without consequence on durability and the physical and mechanical properties of very high performance concrete, such as the compressive strength. This work is an experimental research that shows the effects of temperature on the mechanical properties of very high performance concrete (VHPC) and compares them with those of conventional concrete and HPC. Test specimens in usual concrete, HPC and VHPC are made, preserved till maturity of the concrete, and then subjected to a heating-cooling cycle from room temperature to 500°C at heating rate 0.1°C/min. Mechanical tests on the hot concrete and cooling (air and water) were realized. The results show that the mechanical characteristics of VHPC (density, compressive strength, tensile strength and elastic modulus) decrease with increasing temperature, but their strength remains higher than that of conventional concrete.

• Periodical: International Journal of Engineering Research in Africa (Volume 34)
• Pages: 29-39
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.34.29
• Online since: January 2018
• Authors: Mebarek Belaoura*, Dalila Chiheb, Mohamed Nadjib Oudjit, Abderrahim Bali
• Keywords: Fire, Mechanical Behavior, Temperature, VHPC, W/C Ratio

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