An Experimental Study on Self Compacting Concrete

Abstract

Concrete is the most widely used construction material because of its mould ability into any required structural form and shape due to its fluid behaviour at early ages. Thorough compaction, using vibration, is normally essential for achieving workability, the required strength and durability of concrete. Inadequate compaction of concrete results in large number of voids, affecting strength and long term durability of structures. Self- Compacting Concrete (SCC) provides a solution to these problems. As the name signifies, it is able to compact itself without any additional vibration. This study presents the performance of M40 grade SCC by using Ordinary Portland cement, fine aggregate, Coarse aggregate, mineral admixtures named Fly ash, and chemical admixture named Poly Carboxylate ether used as a super plasticiser. In order to prepare suitable mix proportion for M40 grade for fly ash based SCC, investigations were undertaken replacing cement with 0%, 10%, 20% and 30% of fly ash and with adjusted dosage of super plasticizer (Poly Carboxylate ether). As per IS 10262: 2019, various workability tests have been carried out on fresh properties of SCC. The Compressive strength, Split Tensile strength and Flexural strength of the specimens have been analysed for 7 days, 14 days and 28 days curing and 20 to 25 % replacement of fly ash can be regarded as a suitable replacement.