Utilizing Fly ASH and GGBS as Cement Subtitutes to Enhance Strength in Sustainable Concrete Flexural Member

Geo polymer concrete (GPC) is emerging as a sustainable alternative to conventional concrete, offering reduced environmental impact and enhanced strength. It is made up of industrial by-products like Fly ash Class F and ground granulated blast furnace slag (GGBS), activated with alkaline solution such as sodium hydroxide (NaOH) and Sodium Silicate (NaSi2O3). Fly ash and GGBS are partially used in GPC increases the mechanical properties of concrete compared to conventional concrete. In literatures, it was noted that when increase the molarity of NaOH ; the slump value is decreased in GPC. When the fly ash in GPC exceeds more than 50% were increase the compressive strength but reduce the workability during the geo polymerization. Here, increasing the NaOH and NaSi2O3 concentration ratio, 1:2 Ratio in GPC can accelerate the alumino- silicate breakdown promoting the rapid formation of geo polymer gels gives more binding in GPC. GGBS was added in percentage for achieving the higher compressive strength and workability. The research focused on preparation and performance of M50 grade of GPC mix designed for 10 molarity alkaline solution using Class F Fly ash and GGBS. The mechanical properties like compressive, tensile & flexural strengths and durability property like water absorption were studied and compared with conventional concrete. The experimental results were analysed using Ansys software and validated