Experimental studies on strength performance of high strength geopolymer concrete using Egg shell powder, and rice husk ash with recycled coarse aggerate for sustainable environment.

This research papers examines the strength aspects of High Strength Geopolymer Concrete (HSGPC) when waste materials such as Egg Shell powder (ES), Rice husk Ash (RA), are used in concrete. ES is used as a replacement for Fly ash (F). Trial percentages of ES are carried out from 0%, 10%, 20%, 30%. Two types of curing were used for the research work, ambient curing and heat curing. The mechanical, durability and micro structural properties of the samples are determined using the various tests available as per the ASTM standards. The suitability of ES and RHA as a replacement is studied as a main objective to determine the variation of strength aspects when tested for mechanical and durability studies. From the test results it was found that the use of ES 20% gave better results as it enhanced the mechanical properties and long-term characteristics. Samples under heat curing gave 20% better results when compared to ambient curing for compressive strength at 7 days, 12% improvement for flexural tests. Usage of ES in geopolymer concrete above 30% lead to decrease durability characteristic of concrete. From the microstructural analysis it was found that due to the usage of ES a dense bond arises in the concrete.