A COMPARATIVE STUDY ON THE COMPRESSIVE STRENGTH OF CONCRETE USING WASTE GLASS AS PARTIAL REPLACEMENT OF FINE AGGREGATE AND COARSE AGGREGATE

Abstract

This thesis presents a comparative study on the compressive strength of concrete using waste glass as a partial replacement of fine aggregate and coarse aggregate. The main objective of the study is to evaluate the effectiveness of incorporating waste glass in concrete mixes, particularly its influence on compressive strength, and to examine its potential as an eco friendly and sustainable construction material. In this research, Indian Pakur stone was used as the coarse aggregate and Sylhet sand as the fine aggregate. Crushed waste glass was used as a partial replacement for both aggregates at four different replacement levels: 5%, 10%, 15%, and 20% by weight. The concrete was designed with an M20 mix ratio (1:1.5:3) and a constant water-cement ratio of 0.45. Cylindrical concrete specimens were cast and tested for compressive strength after 7 and 28 days of curing using a Universal Testing Machine (UTM) with a maximum capacity of 1000 kN, following ASTM standards. The results showed that the 7-day compressive strength did not exhibit a significant increase compared to the control mix. However, the 28-day compressive strength showed notable improvements. The best performance is seen at 10% and 15 % fine aggregate replacement and 5% and 20% coarse aggregate replacement at 28 days. This study demonstrates that waste glass can be effectively used in concrete as a partial replacement for both fine and coarse aggregates, contributing to the production of lightweight, strong and sustainable concrete. The findings support the potential for large-scale application of waste glass in the construction industry, aligning with global sustainability trends and reducing the environmental impact of glass waste.