Comprehensive Evaluation of Geopolymer Concrete for Enhanced Railway Sleeper Performance

Abstract

The current research explores the load-bearing performance of geopolymer concrete sleepers as a sustainable alternative to conventional cement-based sleepers in railway infrastructure. Through rigorous comparative analysis, the study demonstrates that geopolymer sleepers exhibit comparable or superior strength characteristics under various loading conditions. The Key mechanical properties, including compressive strength, flexural strength, split tensile strength, and durability, are systematically assessed to evaluate the performance of geopolymer concrete thoroughly. The study investigates constant ratios of Ground Granulated Blast Furnace Slag (GGBS) to fly ash (60:40) and different ratios recycled coarse aggregate to natural coarse aggregate (100:0, 0:100, 70:30) to determine the optimal mix proportions. The experimental methodology employs a mix ratio of 1:1.28:3 and an 8 M alkaline solution with a NaOH to Na₂SiO₃ ratio of 1:2.5, alongside an alkaline solution to binder ratio of 0.43. Additionally, the static bending strength of the sleepers is analyzed, providing deeper insights into their structural performance. This research significantly advances the knowledge and application of geopolymer concrete in railway infrastructure, highlighting its potential for enhanced sustainability and durability.