Evaluation of Mechanical Properties of Fiber Reinforced Concrete Using Crumb Rubber as a Sand Replacement

https://doi.org/10.46610/JoCCS.2025.v010i03.004

Abstract

The safe disposal of waste rubber from utilized automobile tires has become a global environmental challenge. Crumb rubber powder, obtained by shredding waste tires, has shown potential as an eco-friendly alternative in cementitious composite production. This investigation laboratory-basedly investigates the influence of partial substitution of fine aggregates (sand) by crumb rubber powder on the mechanical characteristics of fiber reinforced concrete (FRC). Concrete mixes of grade M30 were prepared with 0%, 5%, 10%, 15%, and 20% substitution of sand by crumb rubber, along with steel/polypropylene fibers. Tests on compressive, split tensile and flexural mechanical performance were carried out at 7, 14, and 28 days. Results indicated a reduction in compressive mechanical performance at higher substitution levels, but notable enhancements in toughness, ductility, and crack resistance, particularly at 10-15% substitution. The findings demonstrate the potential of crumb rubber cementitious composite for eco-friendly construction applications.