High-Strength Synthetic Macro Fibers
Fiber-reinforced shotcrete is used in tunnel linings, underground engineering space support, mine structure reinforcement, power station dam foundation reinforcement, and highway slope protection projects. Among these applications, polypropylene synthetic fibers have become a core component of shotcrete, playing a crucial role. We will discuss the key role of polypropylene synthetic fibers in fiber-reinforced shotcrete from the perspectives of crack resistance, irreplaceability, and cost-effectiveness.
Description
Polypropylene synthetic fibers play an irreplaceable role in fiber-reinforced shotcrete.
The toughness of polypropylene synthetic fibers, along with the physical indentations on their surface, makes them more cohesive within the concrete. When mixed with concrete and then sprayed, the reinforcement structure becomes more uniform, easily adhering to the rock formation as a whole without leaving gaps like wire mesh. Additionally, each layer sprayed during the shotcrete process becomes denser. In shotcrete applications, many geographic and environmental factors can increase the difficulty of the project. Polypropylene synthetic fibers are not affected by freezing, acid, or alkali, ensuring their performance in shotcrete is stable and unaffected by geographic and environmental factors.
Precautions for Adding Polypropylene Synthetic Fibers to Shotcrete:
- When adding polypropylene synthetic fibers on-site, add them slowly to avoid clogging and accumulation.
- The length of the fibers should not exceed sixty percent of the pipe’s diameter.
- Polypropylene synthetic fibers can effectively control rebound, but it’s also important to ensure the spraying pressure, angle, and even the equipment used.
Physical Properties
| Material | polypropylene raw material |
| Fiber size: diameter | diameter: 0.6-0.9mm; length: 38-58mm |
| Minimum tensile strength | >650MPa |
| Module | >10GPa |
| Elongation at break | ≤10% |
| Density | 0.91 g/cm3 |
| Acid and alkali resistance | excellent |
| Moisture content | ≤0.1% |
| Appearance | White diamond-shaped indentation |
User guidance
Dosage: The general dosage is 3-9kg/m³.
Length: The length should be 38-58mm, depending on the diameter and the size of the spray pipe.
Mixing: When adding at the mixing station, proceed as usual but mix for an additional 2 minutes. Pay attention to the ratio of water, materials, and additives. If mixing on-site, add the fibers slowly rather than all at once, and mix longer, increasing the mixing time by 3 to 5 minutes until the fibers are evenly dispersed.
Curing: The curing process for concrete with added fibers is the same as for concrete without fibers.
Package
5 kg per box, 500 kg per pallet, volume 1.45 cubic meters
One bag is 10 kilograms, the volume of one ton is 6.8 cubic meters, without pallet
