Study on Partial Replacement of Cement and Coarse Aggregate by Egg Shell Powder and Steel Slag in Concrete

Abstract

Abstract: In this research, eggshell powder (ESP) was used as a partial substitute for cement in concrete to decrease the usage of cement in concrete production. The main objective of the study was to determine the workability and reinforcing properties including compression, tensile and flexural strength of concrete using various percentages (0, 10, 20,&10) of ESP by weight instead of cement. A total of 38 concrete samples were cast (12 cubic meters, 12 cylinders and 12 prisms) with a target strength of 28 N/mm2. The compressive strength of a cube sample (150 × 150 × 150 mm) was tested after 7, and 28 days, while tensile strength were also measured for 7 days and 28 days using a cylindrical specimen (200 × 100 mm). The bending strength of the specimen (100 x 100 x 500 mm), cast during 7, and 28 days of curing. The test results showed that during the. With ESP 20%, tensile strength increased by 30%, and a maximum strength of 20% was obtained using ESP 20% during 28-day cure. As the percentage of ESP increases, the workability of fresh concrete decreases. ESP is used in concrete to enhance the power of a concert. Natural aggregates are becoming scarce and their production and shipments is also becoming more difficult. The main objective of this study is to identify alternative source of good quality aggregates which is depleting very fast rate due to the fast pace of construction activities in India and to improve the workability and durability of concrete. Use of steel slag as a waste industrial which is the by-Product of iron and steel production provides great opportunity to utilize it as an alternate to normally available coarse aggregates. In this study concrete of M30grade for a w/c ratio of 0.45 respectively for the replacement of 10%,20% and 30% of coarse aggregates by steel slag which is produced as a waste material in steel industry and has a negative impact on environment when disposed. The investigation reveals that the steel slag could be utilized as coarse aggregate in all the concrete applications and shows a considerable improvement in the compressive strength of concrete over the control mixes by 7 to 8%. Results show that the concrete incorporating steel slag has higher compressive strength and an increase in density and stability was clearly observed in the specimens replaced with steel slag as coarse aggregate