PP Macro Fiber Specification Guide for Shotcrete and Foundation Reinforcement

Polypropylene (PP) macro synthetic fiber is an engineered structural reinforcement widely used to enhance the toughness, impact resistance, and post-crack ductility of concrete in underground support, slope stabilization, and heavy-duty foundations. To ensure optimal performance across international projects, adhere to the following technical parameters and engineering standards.

Key technical specifications

◆Fiber Length & Shape:

Standard Length: 25 mm – 70 mm (optimal aspect ratio for crack bridging).

Geometry: Embossed, wave, or twisted profile to maximize mechanical anchorage and matrix bonding.

◆Mechanical Properties:

Tensile Strength: ≥ 550 – 650 MPa (high-tenacity virgin polymer).

Modulus of Elasticity: ≥ 7.0 – 9.5 GPa.

Specific Gravity: ~0.91 g/cm³ (100% rust-proof and alkali-resistant).

International Testing Standards & Compliance

◆For overseas tenders and export projects, quality verification should strictly comply with:

ASTM C1116 / C1116M: Standard Specification for Fiber-Reinforced Concrete (Type III Synthetic).

EN 14889-2 (Class II): Fibres for concrete – Polymer fibres for structural use (CE certified).

ASTM C1550 / EN 14488-5: Energy absorption performance (Round Panel / Square Panel Toughness Tests).

ASTM C1609: Flexural performance and residual strength of fiber-reinforced concrete.