Experimental study of strength and microstructure of roller compacted concrete containing waste glass aggregate

The objective of this study is to explore the utilization of waste glass (WG) as a substitute for aggregate content in the production of environmentally friendly Roller-Compacted Concrete (RCC). The WG employed in this study ranged in size from 0.1 to 10 mm. Different percentages of WG (10%, 20%, and 30%) were introduced into the mix in lieu of traditional aggregate, and the impact of this substitution was assessed through a series of compressive (Fc) and tensile (Ft) strength tests. A total of 24 tests, comprising 12 for Fc and 12 for Ft, were conducted. Additionally, scanning electron microscopy (SEM) was employed to investigate the microstructure properties of the concrete mixed with WG. The findings revealed that substituting 10% of the fine WG decreased both compressive and tensile strength in the mixes at all curing times (7, 14, and 28 days). Conversely, replacing 30% of the WG with fine aggregate resulted in notable improvements, with increases of up to 10% and 14% for Fc and Ft, respectively. Therefore, incorporating WG as a fine aggregate in RCC has the potential to enhance its strength characteristics. However, it is important to note that further research is necessary to enhance its long-term durability.