Abstract 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. Influence of Mineral Admixture on Stress Strain Behaviour of Self Compacting Concrete under Elevated Temperature I. Antony Godwin 1* , N. Anand 1 , G. Prince Arulraj 2 and C. Aravindhan 3 1 Karunya University, Coimbatore – 641114, Tamil Nadu, India; antonygodwin@karunya.edu, nanand@karunya.edu 2 SNS College of Technology, Coimbatore – 641035, Tamil Nadu, India; princearulraj@yahoo.com 3 Bannari Amman Institute of Technology, Sathyamangalam – 638401, Tamil Nadu, India; caravindhan@karunya.edu.in Keywords: Elevated Temperature, Flyash, Metakaolin, Self Compacting Concrete, Silica fume, Stress Strain 1. Introduction Concrete is a construction material widely used in the infrastructure development, the properties of concrete may change aſter exposure to high temperature. Hence, it is important to understand the behaviour of concrete materials under elevated temperatures. It is essential that the structural engineers should have idea on mechanical properties of concrete subjected to high temperatures. e variations in the mechanical properties of concrete aſter exposed to high elevated temperatureareto be inves- tigated. When concrete is exposed to high temperature, strength and stiffness on concrete reduces significantly, due to loss of moisture, dehydration of cement paste and decomposition of aggregate. Due to these changes in the micro-structure of concrete, compressive, tensile and bending strength of the concrete is significantly reduced. To examine and repair the fire affected concrete mem- bers, it is essential to understand the effect of temperature on the mechanical properties of concrete, especially the stress-strain behaviour which determines the behavior of structural members under different loads. e stress strain relationship of conventional and high performance concretes (SCC) under elevated temperature may be *Author for correspondence Indian Journal of Science and Technology, Vol 9(6), DOI: 10.17485/ijst/2016/v9i6/87702, February 2016 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645