The Properties of Glass Fiber Reinforced Lightweight Concrete under the Effect of High Temperature

Abstract

This study aimed to produce lightweight concrete by using 50% pumice as coarse aggregate and 0.1% and 0.3% glass fiber. It is aimed to investigate the changes that will occur in the compressive strength and splitting tensile strength properties of the samples when this lightweight concrete produced is exposed to temperatures of 150 °C, 300 °C, 450 °C and 600 °C. The study was carried out in six stages. In the first stage, reference samples were produced. In the second stage, 0.1% and 0.3% glass fiber reinforced lightweight concrete samples were produced. In the third stage, unit weight, porosity, compressive strength and splitting tensile strength tests were applied to the produced samples. In the fourth step, the samples were gradually exposed to different temperatures (150 °C, 300 °C, 450 °C and 600 °C). In the fifth stage, compressive strength and splitting tensile strength tests were applied to the samples exposed to high temperature. In the sixth and final stage, SEM images of 0.1% glass fiber reinforced lightweight concrete samples were analysed. As a result, it was observed that the unit weight value decreased and the porosity values increased with glass fiber reinforcement. There was also an increase in compressive and splitting tensile strengths. In addition, it was observed that the samples exposed to 150 oC temperature had the highest compressive strength and splitting tensile strength. In the analysis of SEM images, with the increase in temperature, it was determined that the samples in microstructure changed into macrostructure as well as the cracks occurred in the sample structure. The importance of this study stem from increasing tensile strength of lightweight concrete with glass fiber reinforcement so as to prevent loss of life and property in an earthquake.This study is important because it increases the tensile strength of lightweight concrete with low tensile strength with glass fiber reinforcement. This will result in less loss of life and property in an earthquake.

Keywords: Glass fiber, pumice, lightweight concrete, high temperature

DOI: 10.7176/CER/14-4-07

Publication date:June 30^th 2022