A Ação do fogo sobre os componentes do concreto

Abstract

The concrete is a composed material where different materials constitute that it do not react ahead in the same way of the action of high temperatures, becoming the effect of the fire on the concrete structures a problem clearly. The time of exposition to the fire, reached level of temperature and the trace of the concrete, will influence in the alteration degree that could be produced in the concrete affected for these factors. To study the effect of the fire, where a fire is different of the other, it is necessary to carry through a fire real, due to the different variable. The effect produced for the fire in the armed concrete can be analyzed observing the results gotten in the mortar, the steel, the entailing enter both in the armed concrete, the consequences of the when hindered dilatations total or partially and production of resultant efforts of fires. The effect of the rise of the temperature in cylindrical bodies of mortar test had been analyzed, kept in humid chamber, to air, during 7 days. It was used siliceous sand of river and Portland cement CP-V, submitted to the rise of temperature in muffle. The concrete ones submitted to the action of the fire lose considerably its resistance, where, as the temperature increase increases its loss, and its elasticity is below of the desired levels, as it can confirm these data gotten through the bibliographical revision.