Improving the Design and Performance of Rigid Pavements with Fiber Concrete

Abstract

The road pavement structure supports vehicle loads and consists of layers designed for comfort, durability, and soil stress reduction. This research aims to enhance rigid pavement performance by adding fine needle fibres to concrete for improved mechanical properties like ductility, fracture toughness, flexural strength, shrinkage, cracking, and split tensile strength. Pine needle fibres are compared with steel and synthetic fibres for corrosion resistance and cost-effectiveness. The study outlines the preparation of Pine Needle Fibber Reinforced Concrete, emphasizing uniform fibre dimensions. It explores the impact of fibre types and percentages on concrete mechanical properties to advance pavement design. Concrete mixtures use ordinary Portland cement, sand, and aggregate, with pine needle fibres added for PNFRC. Testing follows ASTM standards for consistent and reliable results. Despite lower slump and increased water-cement ratio in PNFRC, it enhances mechanical properties, improving strength and durability. While PNFRC shows a decrease in split tensile strength compared to plain concrete, its unique behaviour during testing, with increased ductility and energy absorption, suggests potential for structural applications. The study concludes that pine needle fibres can significantly improve energy absorption, toughness, and durability in concrete, making it promising for robust pavement structures. Practical benefits include enhanced durability, reduced structural failure, and guidance for future developments in rigid pavement construction for sustainable infrastructure.