Factors That Impact Fire Resistance Performance Essay

1560 Words7 Pages
Fire response of concrete structural members is dependent on the mechanical, thermal and deformation properties of concrete. These properties differ significantly with temperature and also depend on the characteristics and composition of concrete batch mix as well as heating rate and other ecological conditions. In this section, the key characteristics of concrete are defined. The various things that impact fire resistance performance, and the role of these things on fire resistance, are discussed. The variation of mechanical, thermal, deformation, and spalling properties with temperature are presented for different types of concrete.
This study is part of a present research that leads to estimate the level of concrete degradation properties caused by high temperatures, mostly by using the concept of maturity. In order to evaluate the coupled effect of high temperature and heating time on the residual strength of concrete, a series of compressive and indirect tensile tests was performed on normal and high strength concretes. The effect of incorporating polypropylene fibers in high strength concretes was also investigated. Cubical concrete specimens were exposed to different target high temperatures (100, 300, 500 and 700 ºC) for 3, 6 and 9 hours and then cooled in air. Compressive and flexural strengths of these concrete samples were compared with each other and with the unheated samples. Experimental results indicate that concrete strength decreases with
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