EXPERIMENTAL EVALUATION OF SUSTAINABLE GREEN CONCRETE WITH WHEAT STRAW ASH AS A PARTIAL REPLACEMENT OF CEMENT AND GLASS WASTE AS A PARTIAL REPLACEMENT OF FINE AGGREGATE.

Abstract

Concrete is the most commonly used material in the world. Increase Infrastructure and growth in construction activities in Ethiopia and across the world increase the cost of construction materials. The general constituent materials of concrete are a binding material, fine aggregate, coarse aggregate, and water. The most prevalent type of cement used in concrete, known as ordinary Portland cement (OPC), serves as a bonding agent for the fine and coarse aggregate. However, Portland cement is pricey and a significant source of CO2, which causes many environmental issues. In many nations, properly disposing of the enormous volume of waste glass has emerged as a severe environmental challenge. This study is reducing the amount of sand used in the concrete mix, which ultimately lowers the cost of concrete. Additionally, when less sand is used, the cost of building can be decreased overall because glass waste is obtained cost-free. In this research work, the C-25 grade of concrete is used to determine the compressive strength, flexural strength, split tensile strength water absorption sulfate attack, carbonation, and PH of concrete mixed with wheat straw ash in different proportions (0%, 5%,10% 15%), glass waste (0%, .10%, 20%, 30%) at curing ages of 7days.14days and 28 days for compressive strength and tensile strength, flexural strength, water absorption microstructural characterization through XRD, FTIR and SEM studied on the 28days sulfate attack, carbonation and PH studied on 56 days. The result of compressive strength at 7 days, 14day, and 28 days show a maximum strength of 5% wheat straw ash replacement in cement and 20% glass waste in fine aggregate in the production of C-25 concrete. Also flexural and split tensile strength of concrete, at 28 days shows similar improvement. The compressive strength up to 10% replacement of wheat straw in cement and 30% glass waste in fine aggregate is greater than that of the mean target strength. Beyond 10% wheat straw ash replacement the compressive, flexural strength and tensile strength show reduction. The durability test results of concrete revealed that M3 shows improved resistance to water absorption, sulfate attack, PH of concrete and carbonation. The microstructural characterization of M1 and M3 after the reaction was investigated by XRD, FTIR, and SEM.