Indian Journal of Research Foundation, ISSN : 2454 – 6585, Volume 2, Issue 2 (April 2021). Civil Engineering * For Correspondence: p.lekshmiram@gmail.com AN EXPERIMENTAL STUDY TO REDUCE SELFWEIGHT OF CONCRETE USING PUMICE STONE AS COARSE AGGREGATE P.RAJALEKSHMI a* , SHANMUGAVADIVU P M a , J. PRAKASH ARUL JOSE b , D. R. ANAND REJILIN c a Department of Civil Engineering, Gopalan College of Engineering and Management b Research Supervisor, Noorul Islam University c Department of Civil engineering, Mar Ephraem College of Engineering ABSTRACT The study looks at the usage of pumice aggregate in certain types of concrete, such as lightweight concrete (natural aggregate). The high self-weight of conventional concrete is one of its drawbacks. Due to its high self-weight, it will be an uneconomical structural material to some extent. To minimize dead loads and enhance thermal insulation, lightweight concrete with a low density is utilized. It has a reduced density since it is used as a partial replacement for coarse aggregate in concrete. Using mix M30 with poly carboxyl ether addition, this study compared conventional concrete to low-weight aggregate concrete. Pumice is used to partly replace coarse aggregate in lightweight concrete at different percentages ranging from 20% to 100%. The objective of this research is to determine which of the above-mentioned alternatives is the best replacement by evaluating the compression and split tensile strength characteristics of lightweight aggregate concrete. The results are compared to those of conventional concrete. Keywords: Pumice Aggregate, light weight concrete, low density concrete, light weight aggregate. 1. INTRODUCTION Because coarse aggregate is less costly than cement in the production of concrete, the most cost- effective approach is to utilize as much aggregate as feasible. The use of aggregates improves the volume stability and durability of the finished concrete 1 . An appropriate aggregate should