Influence of Mineral Admixture on Stress Strain Behaviour of Self Compacting Concrete under Elevated Temperature

Background: The aim of the research is to study the effect of elevated temperature on different grades of Self Compacting Concrete (SCC), which is having excellent deformability and segregation resistance. Methodology: SCC specimens were cast using Silicafume (SF), Flyash (FA) and Metakaolin (MK) as mineral admixture, Master Glenium SKY as Superplasticizer (SP) and Glenium Stream as Viscosity Modifying Agent (VMA). After heating the specimens to 900ºC, samples were allowed to cool naturally in case of air cooling and water was sprayed on the specimens in case of water cooling. Compressive strength and Stress Strain behaviour of specimens were found. Findings: Compressive strength of SCC specimens with SF, FA and MK were found to decrease by 53.57%, 65.25% and 72.95% respectively for air cooling. In case of specimens cooled by water, the decrease in strength was found to be 78.67%, 81.19% and 83.01% respectively for specimens with SF, FA and MK. The higher powder content of SCC makes the permeability of concrete as low, thus makes SCC more susceptible to spalling under high temperature. The percentage reduction in compressive strength of M50 grade specimens with MK was found to be 72.95% and 83.01% for the specimens cooled by air and water respectively. Higher strength loss was observed for higher grade of SCC. It was found from the experimental investigations that, higher strain values were observed for the specimens cooled by water as compared to specimens cooled by air and reference specimen. Application: Fire safety design of structural elements.