Concreto com fibras curtas de aço submetido a alta temperatura

Abstract

This study investigated conventional concrete with the addition of short fibers of steel in normal condition and after have been subjected to high temperature. The fibers were characterized by microscopy and mechanical tensile tests. The constituents of the cementitious composites were characterized. To evaluate the interaction between fibers and the cement matrix, were fabricated prismatic specimen partitioned with 40x40x160mm, the halves were connected by threefibers in the direction longititudinal and they were tested at flexion. To evaluate the cementitious composites reinforced, was molded 4 prismatic specimens with 150X150X500mm and 20 cylindrical with 100mm in diameter and 200mm in height for each type of model with fiber and without fiber. Half of the specimens was taken to the oven for heating. After heating, the raw samples and submitted high temperatures were mechanically characterized by compressive strength testing, tensile strength in diametral compression testing, tensile strength testing in bending and dynamic modulus of elasticity. The results show that there is a reduction in the mechanical properties after subjection to high temperatures, and smaller losses in fiber reinforced concrete.