Optimizing sisal fibre-reinforced self-compacting mortar with glass powder for enhanced mechanical properties
DOI:
https://doi.org/10.63746/njtd.v23i1.3929Keywords:
Industrial waste materials, Mechanical properties, Microstructure, Self-compacting mortar, Sustainable constructionAbstract
Sustainable alternatives are needed to reduce cement consumption while maintaining self-compacting behavior and enhancing toughness, ductility, and durability. Sisal fiber, with its high tensile strength and crack-bridging ability, improves ductility, while recycled glass powder (GP), due to its pozzolanic properties, reduces cement use and densifies the matrix. However, their combined effects in self-compacting mortar (SCM) remain underexplored. In this study, a Central Composite Design (CCD), implemented within a Design of Experiments (DoE) framework using Design-Expert software, was employed to statistically model and optimize the effects of GP and sisal fiber. GP replaced cement at 0–22.5%, while sisal fiber (SF) was incorporated at 0–1% by volume. Binder content, sand (14.3?kg), and water (4948?ml) were kept constant. Specimens (50?mm cubes and 40?×?40?×?160?mm beams) were vibrated, cured at room temperature for 24?hours, submerged in water at ~27?°C, and tested at 7, 28, 56, and 90 days. Results show that SF enhances compressive and flexural strength, especially when combined with GP. Microstructural analysis revealed an increased amorphous hydration matrix associated with GP incorporation and suggested enhanced pozzolanic-related phases in SF-modified mixes. The optimal mix (7.5% GP, 0.5% SF) achieved a balance of strength, supporting its potential use in eco-friendly construction.
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