(PPMF)Polypropylene Fine Fiber (PPMF)
1. Product introduction
Polypropylene Fine Fiber (PPMF) is a high-strength bundled monofilament fiber made of polypropylene resin as the primary raw material by a unique process. Adding it to concrete (or mortar) can effectively control micro-cracks caused by plastic shrinkage, settlement, and temperature changes in concrete (or mortar) and prevent and inhibit the formation and development of cracks. As a result, it can be widely used in industrial and civil construction, water conservancy engineering, road, and bridge engineering.
2.Technical indicators
fibre type |
bundled monofilament |
breaking strength |
≥500MPa
|
cross-sectional shape |
trilobal or round |
elongation at break |
≤50%
|
equivalent diameter |
15-45μm
|
elasticity modulus |
≥3850MPa
|
proportion |
0.91-0.93g/cm³
|
melting point |
160-180°C
|
length |
20mm
|
acid-base resistance property
(Strength retention rate) |
≥96%
|
3.Reinforcing Function of PPMF
★Anti-cracking effect on concrete
Concrete accompanying fibers are three-dimensionally distributed in concrete, effectively reducing the stress concentration at the tip of micro-cracks and preventing the occurrence and expansion of micro-cracks.
★Improve the impermeability of concrete
The uniform distribution of PPMF in concrete forms a support system that reduces the bleeding of concrete and significantly improves its impermeability.
★Improve the freeze-thaw resistance of concrete
Because PPMFr can effectively reduce the concentration of tensile stress in concrete caused by multiple freeze-thaw cycles, prevent the further development of micro-cracks, and help improve its freeze-thaw resistance.
★Improve the impact resistance and toughness of concrete
PPMF helps to absorb the kinetic energy of concrete components when impacted, and due to the crack resistance effect of threads, it can effectively enhance the impact resistance and toughness of concrete.
★Improvement of the durability of concrete
Due to the excellent crack resistance effect of PPMF, it can significantly reduce the occurrence and development of cracks, the internal porosity, and the corrosion of the primary reinforcement of the structure so that the durability of concrete is greatly improved and enhanced.
★Improve the high-temperature resistance of concrete
In concrete, especially high-strength concrete mixed with PPMF, the uniformly distributed fiber monofilaments present a three-dimensional random distribution, forming a network structure. The fibers melt and create when the temperature inside the concrete member rises above 165ºC. The internally connected channels allow the strong high-pressure steam to escape from the concrete, effectively avoiding bursting in a fire environment.
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