How Does Fibrillated PP Fiber Work in Concrete for Crack Prevention ?

How Does Fibrillated PP Fiber Work in Concrete for Crack Prevention ?

Fibrillated polypropylene (PP) fibers are engineered with a mesh-like structure that splits into smaller filaments 

when mixed into concrete, creating a dense 3D network. 

This unique structure enhances crack prevention in several ways:  

1. Plastic Shrinkage Crack Reduction

- During the early stages of curing, concrete loses moisture, 

causing tensile stresses that lead to plastic shrinkage cracks.  

- Fibrillated fibers act as micro-reinforcement, distributing stress and holding the mix together, 

reducing crack formation.  

2. Improved Tensile Strength & Ductility

- Unlike plain concrete (which is brittle), fibrillated PP fibers,bridge microcracks, delaying their propagation.  

- The interconnected network enhances, post-crack behavior, preventing sudden failure.  

3. Reduced Settlement & Bleeding Cracks

-Fibers minimize water migration (bleeding) and aggregate settlement, 

-which can cause weak spots and surface cracks.  

4. Enhanced Durability

- By reducing crack width, 

fibrillated fibers limit water and chemical penetration, 

improving freeze-thaw and corrosion resistance.  

Comparison to Non-Fibrillated Fibers: 

- Fibrillated fibers provide better crack control due to their larger surface area and mechanical bond with the matrix.  

- Monofilament fibers (non-fibrillated) are smoother and mainly reduce plastic shrinkage cracks but offer less long-term reinforcement.  

Applications: 

- Shotcrete & thin overlays (where cracking risk is high)  

- Industrial floors & pavements (for impact resistance)  

- Precast concrete (to handle handling stresses)  

Fibrillated PP fibers are a cost-effective alternative to wire mesh, 

offering uniform dispersion and labor savings while significantly improving concrete performance.