Estudo do Comportamento dos Concretos em Situações de Incêndio

Abstract

The concrete, when subjected to fire situations, suffers from impairment of its properties, which can reach large proportions and even result in the collapse of the structure. This work aims to investigate the interference of temperature rise on the properties of concrete.  For this, experimental traces were prepared according to Paulo Helene and Terzian dosing methodology, with the 1: 5 trace of cement and aggregates. Thus, 30 specimens were molded for the type of cement studied, 6 of them as reference, 12 submitted to 300 ° C and 12 to 500 ° C. They were subjected to rapid cooling and slow cooling, which are common in fire fighting interventions. The cements used were CP-II-32 F, CP-IV, CP-V ARI. The samples were tested for compressive strength and tensile strength by diametral compression and, in general, the largest strength losses were observed in specimens subjected to a temperature of 500 ° C and rapidly cooled. In addition, in relation to cooling, CP-IV was the least altered, but in relation to temperature, it presented the largest variations among the studied cements.