Effects of Waste Tire Rubber Chips and Gum Arabic on High-Strength Concrete as Coarse Aggregate Replacement and Admixture
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This study investigates the development of eco-friendly high-strength concrete incorporating Gum Arabic (GA) as a bio-based admixture and waste rubber tyre (WRT) as partial replacement for coarse aggregate. The aim is to address environmental challenges associated with conventional concrete materials while improving ductility and fracture resistance. Seven concrete mixes were produced: a control mix, two mixes with GA additions (0.4% and 0.6% by weight of cement), and four mixes combining GA with WRT replacements (5% and 10%). Compressive strength was evaluated at 7, 14, and 28 days. Results showed compressive strength values ranging from 17.6 MPa to 32.33 MPa. Although the target M35 strength was marginally unmet at higher replacement levels, the rubberized concrete exhibited enhanced ductility, energy absorption, and cohesive failure behaviour. These characteristics indicate suitability for highway pavement and other applications requiring toughness and resilience.
