Polypropylene (PP) fiber
Polypropylene (PP) fiber is a synthetic, lightweight, and durable material derived from propylene gas, widely used to enhance the performance of cementitious mixtures and concrete in construction. It functions as a reinforcement agent that reduces plastic shrinkage cracks, boosts tensile strength, and improves fire resistance.
Key Properties and Advantages:
- Construction Reinforcement: Acts as a secondary reinforcement, preventing cracks and improving durability, often replacing steel mesh in certain applications.
- Chemical Resistance: Highly resistant to alkalis, acids, and salt, making it ideal for harsh environments.
- Physical Properties: Low density (lighter than water), high strength, and low thermal/electrical conductivity.
- Reduced Permeability: Enhances water tightness and reduces bleeding holes in concrete.
- Versatile Applications: Used inconcrete, plaster, mortars, pavements, and protective coatings.
Application in Construction:
- Mixing: Added to concrete mixes (usually at the end) to form a three-dimensional matrix.
- Dosage: Typically added at a rate of 125g per 50kg bag of cement, though this varies.
- Sizes: 6 mm for plaster/mortars, 12-24 mm for structural concrete.
Other Uses:
Beyond construction, PP fibers are used in textiles, upholstery, and geotextiles due to their hydrophobic properties and abrasion resistance.