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Impact of Sisal Fiber Reinforcement on the Mechanical and Physical Properties of One-Part Geopolymer Mortar with a Ternary Binder System

Enchapparackal Subash Poojalakshmi, Praveen Nagarajan, Janardhanan Sudhakumar, Blessen Skariah Thomas, Sreelakshmi Mughavan Kandi, Anupriya Thekke Maveettil

Abstract


This study investigates the influence of chemical treatment and fiber content on the mechanical and durability properties of sisal fiber-reinforced one-part geopolymer mortar (OP-GPM) incorporating a ternary binder system of diatomite, feldspar, and ground granulated blast furnace slag (GGBS). Sisal fibers were treated with 0.5%, 5%, and 10% NaOH solutions for 2 and 24 h and incorporated at 0.5–2% by binder weight. The workability, compressive strength (CS), flexural strength (FS), split tensile strength (STS), ultrasonic pulse velocity (UPV), water absorption, and chemical resistance were evaluated. Optimal performance was achieved with 1% fiber content and fibers treated with 5% NaOH for 2 h, leading to a 15% increase in CS (54 MPa) and notable improvements in FS (8.62 MPa) and STS (5.88 MPa). Alkali treatment significantly enhanced fiber crystallinity and tensile strength, with a 208% reduction in fiber water absorption. However, excessive fiber content (>1%) reduced workability and mechanical performance. Regression analysis showed strong correlations between the strength properties. The study confirms that properly treated sisal fibers improve the mechanical and durability performance of OP-GPM, offering a sustainable alternative to conventional reinforcement in geopolymer composites.

Keywords



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DOI: 10.14416/j.asep.2025.07.002

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