Production of self compacting concrete using rice husk ash

Abstract

Self compacting concrete flows into formwork and around obstructions under its own weight to fill it completely and self compact (without any need for vibration), without any segregation and blocking. The elimination of the need for compaction leads to better quality concrete and substantial improvement of working conditions. The current study revolves around self compacting concrete made out of locally available material. The objectives of this research were obtaining proper mix designs for grade 50 concrete using rice husk ash and evaluating the fresh and the hardened concrete properties of the mix designs. In the first stage, ten different self compacting concrete mix compositions were made by using ten percentage of rice husk ash with respect to total weight of cement and obtained mix designs to satisfy the consistency, workability, passing and filling ability. In the second stage, harden concrete properties were evaluated for the particular mix design. In this dissertation, experimental details of several trial mixes and attempts taken to satisfy the fresh concrete properties for grade-50 self compacting concrete are presented. The attempts taken to investigate the hardened concrete properties have shown for one trial mix. Cost analysis showed that the cost of ingredients of SCC-02 self compacting concrete mix with rice husk ash is 22.70% more than the SCC-00 self compacting concrete mix with fly ash.