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.
