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Thermal behavior of high performance concretes at high temperature - evolution of mechanical properties

Izabela Gaweska
Abstract : The presented work aims at a better understanding of the behaviour of high performance concretes (HPC) subjected to high temperatures. We were more particularly interested in the mechanical behaviour of concretes during the heating. To realize this study a new experimental device was developed, allowing testing the compressive strength and the direct tensile strength at "hot" stage. The major part of this study was to establish the relations between the mechanical properties and the temperature of different concrete types. The compression strength and the modulus of elasticity change not only with the exposure temperature of the material, but also with the heating scenario (heating ratio, hot/residual tests, etc.) In this study the influence of the water / cement ratio was studied as well as the influence of the addition of the polypropylene fibres on the hot tested mechanical properties of the HPC. It can be deduced from our studies that the evolution of mechanical properties is related to the presence of free water in the material, especially in the range of temperatures until 300°C. An important part of this study was dedicated to the study of transient thermal strains. This behaviour, called "transient thermal creep" was examined on three high performance concretes (HPC) and one ordinary concrete (OC). Among the parameters influencing the transient thermal strain we can mention: the loading rate, the history of the thermo-mechanical loading, the heating rate or the moisture content of the concrete. Furthermore, we were study an existence of the phenomena under tension load. Those results were completed by SEM observations of the microstructure, porosity measurements and weight variations with temperature changes.
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https://pastel.archives-ouvertes.fr/pastel-00001147
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Friday, March 18, 2005 - 8:00:00 AM
Last modification on : Thursday, July 30, 2020 - 10:02:29 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:35:37 PM

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  • HAL Id : pastel-00001147, version 1

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Izabela Gaweska. Thermal behavior of high performance concretes at high temperature - evolution of mechanical properties. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2004. English. ⟨pastel-00001147⟩

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