An Experimental Investigation Of Fiber Reinforced Geopolymer Concrete Beams

Abstract

Geopolymer Concrete (GPC), Synthesized From Industrial By-products Like Fly Ash And GGBS Activated With Alkaline Solutions (NaOH And Na₂SiO₃), Offers A Sustainable Alternative To Conventional Portland Cement Concrete (CC). This Study Investigates The Flexural Behaviour Of M25 Grade Reinforced Concrete Beams, Comparing Conventional And Geopolymer Matrices With And Without Hybrid Fibers Under Static Loading. Eight Full- Absorption. This Improved Performance Is Attributed To The Synergistic Action Of Glass And Steel Fibers Within The GPC Matrix, Enhancing Strength, Crack Resistance, And Deformability. Beam Specimens Of Size(150 × 250 Mm Cross-section, 1500 Mm Span) Were Tested: (B1) CC M25, (B2) CC + GF, (B3) GPC M25with 8M, (B4) GPC + GF. Beams Were Subjected To Two-point Loading; Instrumentation Included Load Cells And LVDTs. Key Performance Metrics Included Crack Load, Ultimate Load, Deflections, Ductility, Toughness, And Energy Absorption. The Hybrid Geopolymer Mix (B4) Outperformed All Others, Showing A 2.50% Increase In Compressive Strength And 10.75% In Flexural Strength Over B1. It Achieved A Ductility Index Of 16.42, Toughness Index Of 14.59, And 23.004% Higher Energy

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