Investigation of Glass Fiber Reinforced Concrete with Partial Replacement of Cement and Fine Aggregate using Coal Ash

Abstract

Concrete is a highly versatile, durable, and cost-effective construction material that is widely used worldwide. However, traditional concrete production has raised concerns regarding its environmental impact and the depletion of natural resources, primarily due to the substantial amounts of cement and sand required. This study aims to develop sustainable concrete by partially substituting cement and sand with fly ash and pond ash, respectively, while incorporating glass fiber. The replacement levels chosen are 20% for cement with fly ash and 40% for sand with pond ash. Additionally, a consistent proportion of 600 gm/m³ of glass fiber is added to examine the combined effect on concrete properties. Experimental tests were conducted to assess both fresh concrete, focusing on workability, and hardened concrete, including compressive strength, flexural strength, and ultrasonic pulse velocity. The results demonstrate that a cement replacement of up to 40% with fly ash, coupled with a low volume of glass fiber, is recommended based on workability. In terms of durability, a replacement of 20% cement and 40% sand using fly ash and pond ash, along with glass fiber, is advised. Furthermore, considering the 28-day strength, the study suggests a maximum replacement of 20% cement and 40% sand with fly ash and pond ash, respectively, in conjunction with 600 gm/m³ of glass fibers.