Superior Strength PVA Fiber for Enhanced Tunnel Concrete Performance

PVAF's key advantage is its combination of exceptionally high tensile strength and modulus, coupled with excellent alkali resistance. This makes it far superior for structural reinforcement and applications demanding the highest durability, unlike polypropylene (PP) which is primarily for plastic shrinkage control or polyester (PESF) which has a lower modulus.

The choice depends on your application. 6mm fibers are typically used in fine mortars, grouts, and thin overlays. 12mm fibers are more common in concrete mixes for better crack bridging over longer distances. We recommend testing both to see which performs best in your specific mix.

No. PVAF is a secondary reinforcement used for crack control due to shrinkage and temperature changes. It does not replace primary structural steel reinforcement designed to carry tensile loads. However, it works synergistically with rebar by minimizing cracking around the steel.

PVAF is renowned for its exceptional alkali resistance, which is crucial for long-term stability in the high-pH environment of Portland cement concrete. It will not degrade like some other natural or synthetic fibers, ensuring lasting performance.

When used at the recommended dosages, PVAF is designed to disperse easily and should not cause significant workability issues. However, any fiber addition can reduce slump slightly. This can be effectively managed with standard water reducers or superplasticizers.