Investigation on the Effect of Pulverized Black Tea Waste (PBTW) and Eggshell Powder (ESP) as Partial Replacement of Cement on the Mechanical Properties of Normal Weight Concrete

Pollution in the environment and the relatively high cost of solid waste disposal have been a paramount concern all throughout the world. This concern prompts the researchers to recycle black tea waste and eggshells. The purpose of this paper is to study Pulverized Black Tea Waste (PBTW) and Eggshell Powder (ESP) as a partial replacement for cement. The proponents used M20 Grade Concrete with a strength of 20 MPa on the 28th day of curing. Different concrete mixtures containing five replacement levels of cement were carried out with (2.5, 5, 7.5, 10, and 12.5% by weight of) PBTW and ESP (by 12.5, 10, 7.5, 5, and 2.5%). The compressive strength, split-tensile strength, and flexural strength tests were used to show the effect of PBTW and ESP on the mechanical properties of concrete. Results indicated that 2.5% of PBTW and 12.5% of ESP slightly increased the compressive strength of the concrete by 3.11%. In contrast, PBTW and ESP show a significant decrease in Split-Tensile Strength and Flexural Strength compared to the controlled sample ranging from 36.74–49.50% to 16.66–38.91% respectively.