Development of sustainable fibre-reinforced self-compacting geopolymer concrete with enhanced resistance to chemical attacks and shrinkage

In the pursuit of sustainable construction materials, the development of self-compacting geopolymer concrete (SCGC) has emerged as a promising alternative to conventional cement-based concrete. However, its brittle behaviour, susceptibility to cracking, and need for elevated-temperature curing limit the structural applications of SCGC, particularly in aggressive environments. This study developed high-strength fibre-reinforced SCGC (FRSCGC) as a novel material, cured at ambient conditions to improve ductility, chemical resistance, and drying shrinkage. Stainless steel fibres with high tensile strength were used to develop FRSCGC. The durability of SCGC and FRSCGC was evaluated through sulphate and acid resistance tests, rapid chloride permeability test (RCPT), and drying shrinkage measurements. Experimental results showed a significant improvement in the resistance of SCGC to sulphate, acid, and chloride ion penetration with the addition of stainless steel fibres. Compared to SCGC, drying shrinkage of FRSCGC was reduced from 2360 μɛ to 1420 μɛ, indicating superior dimensional stability. Microstructural analysis revealed that the crack-bridging mechanism of stainless steel fibres enhanced the interfacial transition zone and mitigated the progression of chemical-induced damage, which improved the mechanical and durability properties of FRSCGC under aggressive environments. The findings of this study highlight the potential of FRSCGC as a sustainable and durable construction material for building infrastructure in aggressive environments.