Efeito de elevadas temperaturas no desempenho mecânico dos materiais utilizados em blocos e tijolos de solo-cimento

Abstract

Fires accidents are often inevitable in civil construction, and the materials used in construction must resist these adversities. The aim of this work aims is to evaluate the performance of soil-cement bricks under fire situations, when subjected to high temperatures, through simulations with specimens of this material. 32 test specimens were manufactured and separated into 4 groups, namely CP-600, CP-850, CP-1100, which were subjected to burning, respectively, at maximum temperatures of 600ºC, 850ºC, 1100ºC, while group CP-0 was not burnt. The samples were subjected to chemical (XRF), mineralogical (XRD), dimensional, macroscopic, microscopic (SEM), water absorption, mass loss, mechanical strength by bending test, thermogravimetric analysis, verification of the parameters of NBR 8491/2012 and performance comparison. Mass loss of the test specimens increased with the increase of the burning temperature. There was an increase in the mechanical strength of the samples when subjected to 600ºC, followed by a slight loss of strength after burning at 850ºC, and a greater loss of strength when subjected to 1100ºC. However, a good resitual strength was preserved even after more intense burning, when compared to other cement manufactured, such as concrete and mortars.