Mechanical Properties of Geopolymer Concrete Subjected to Elevated Temperature

Abstract

Abstract: The present study is to examine the influence of the sustained elevated temperature on hardened properties of the Geopolymer concrete (GPC), achieved by complete replacement of cement by GGBS and SCBA in the proportion of 70:30 andmixing with the sodium based alkaline activators with varying molar concentration of NaOH (4M,8M,12M). After completion of 28 days curing the specimens were kept inside the electric oven , capable of attaining a maximum temperature of 10000C and the required temperature of 2000C, 4000C, 6000C and 8000C was set. After a steady state is reached the specimens were sustained for a predetermined duration of 2 hours. After attaining the 2 hours sustained temperature specimens are set aside to cool to room temperature and tests are conducted to measure the residual strength of the specimens using proper experiment setup. The outcomes revealed that with increase of temperature the weight loss of specimens is increased and the residual compressive strength of the specimens is decreased, GPC has a better resistance against cracking and spalling up to 600 0C