Monofilament Polypropylene Fiber for concrete reinforcement

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Polypropylene fiber (PPF) is a kind of polymer material with light weight, high strength, and corrosion resistance. The crack resistance of concrete can be improved by adding polypropylene fibers. PPF can optimize the pore size distribution of concrete. As a result, the durability of concrete is significantly enhanced since PPF can block the penetration of water or harmful ions in concrete. Different fibre content, fibre diameter, and fibre hybrid ratio will have different effects on the durability indexes. The durability property of concrete can be further improved by combining PPFs and steel fibres. The drawbacks of PPF in application in concrete are the imperfect dispersion in concrete and weak bonding with cement matrix. The methods to overcome these drawbacks are to use fibre modified with nanoactive powder or chemical treatment.

The anti-cracking fiber is a high-strength bundled monofilament organic fiber that uses fiber-grade polypropylene as the raw material and is processed by a special process. It has inherent strong acid resistance, strong alkali resistance, weak thermal conductivity, and extremely stable chemical properties. Adding mortar or concrete can effectively control the micro-cracks caused by temperature changes in the initial plastic shrinkage stage of mortar and concrete, prevent and inhibit the formation and development of cracks, and greatly improve the concrete’s crack resistance, impermeability, impact resistance and Earthquake resistance can be widely used in underground engineering waterproofing, roofs, walls, floors, pools, basements, roads and bridges in industrial and civil construction projects. It is a new ideal material for mortar and concrete engineering with anti-cracking, anti-seepage and abrasion resistance.

Physical parameters:
Fiber Type: Bundle Monofilament / Density: 0.91g/cm3
Equivalent diameter: 18～48 μm / length: 3, 6, 9, 12, 15, 54mm, it can be cut arbitrarily according to user requirements.
Tensile strength: ≥500MPa / modulus of elasticity: ≥3850MPa
Elongation at break: 10～28% / Acid and alkali resistance: extremely high
Melting point: 160～180℃ / Ignition point: 580℃

Main Functions:
As a secondary reinforcement material for concrete, polypropylene fiber can greatly improve its crack resistance, impermeability, impact resistance, earthquake resistance, frost resistance, erosion resistance, burst resistance, aging resistance and workability, pumpability, and water retention. sex.
● Prevent the generation of concrete cracks
● Improve the anti-permeability of concrete
● Improve the freeze-thaw resistance of concrete
● Improve the impact resistance, flexural resistance, fatigue resistance and seismic performance of concrete
● Improve the durability and aging resistance of concrete
● Improve the fire resistance of concrete

Application Areas:
Concrete rigid self-waterproof structure:
Basement floor, side wall, roof, roof cast-in-place slab, reservoir, etc. Engineering, water conservancy projects, subways, airport runways, port terminals, overpass viaduct decks, piers, super-long structures with high requirements for crack resistance, impact resistance, and wear resistance.

Cement Mortar:
Internal (external) wall painting, aerated concrete plastering, interior decoration putty and thermal insulation mortar.
Anti-explosion and fire-resistant engineering:
Civil air defense military projects, oil platforms, chimneys, refractory materials, etc.

Shotcrete:
Tunnel, culvert lining, thin-walled structure, slope reinforcement, etc.
Instructions for use
Suggested dosage:
The recommended amount of mortar per square of ordinary plastering mortar is 0.9～1.2kg
The recommended amount of thermal insulation mortar per ton: 1～3kg
The recommended amount of concrete per cubic meter of concrete is: 0.6～1.8kg (for reference)

Construction technology and steps
①According to the volume of concrete mixed each time, the weight of the fiber added each time is accurately measured according to the requirements of the mix ratio (or the recommended mixing amount).
② After preparing the sand and gravel, add the fiber. It is recommended to use a forced mixer. Add the aggregate together with the fiber into the mixer, but pay attention to ensure that the fiber is added between the aggregate and mix it dry for about 30 seconds. After adding water, mix it wet for about 30 seconds to fully disperse the fiber.
③ Take samples immediately after mixing. If the fibers have been evenly dispersed into monofilaments, the concrete can be put into use. If there are still bundled fibers, extend the mixing time by 20-30 seconds before use.
④ The construction and maintenance process of fiber-added concrete is exactly the same as that of ordinary concrete. Ready to use.
Typically used to reduce the instances of plastic cracking and to increase the toughness of the concrete.
Not recommended as a replacement for traditional shrinkage control reinforcement.

Micro polypropylene (PP) fibers, also known as micro synthetic fibers or micro PP fibers, are tiny fibers typically used as a concrete additive. These fibers, which are made from synthetic materials like polypropylene, are added to concrete mixes to enhance specific properties of the concrete. Here are some applications and advantages of micro PP fibers:

Applications:
Concrete Reinforcement: Micro PP fibers are often used to reinforce concrete. When added to the mix, these fibers help in controlling cracks that occur due to plastic shrinkage and settlement.

Reducing Plastic Shrinkage Cracks: Concrete is prone to plastic shrinkage cracks during the early stages of curing. Micro PP fibers help in reducing and controlling these cracks, improving the overall appearance and durability of the concrete surface.

Improving Durability: Micro PP fibers enhance the durability of concrete by reducing the impact of freeze-thaw cycles, minimizing cracking, and improving resistance to abrasion and spalling.

Shotcrete Applications: Micro PP fibers are used in shotcrete applications, where concrete is sprayed onto surfaces. The fibers help in maintaining the integrity of the sprayed concrete, reducing cracks and improving structural stability.

Overlay and Thin Surface Applications: Micro PP fibers are used in thin overlays to improve their strength and prevent cracking. They are also used in decorative concrete applications where maintaining a smooth surface is essential.

Precast Concrete Products: Micro PP fibers are added to precast concrete products such as pipes, panels, and blocks, enhancing their structural integrity and preventing surface cracks.

Advantages:
Crack Control: Micro PP fibers significantly reduce the formation of cracks in concrete, especially in applications prone to plastic shrinkage and settlement cracks.

Improved Workability: These fibers can improve the workability of concrete, making it easier to handle, mix, and place, leading to better construction practices.

Increased Durability: Micro PP fibers enhance the durability of concrete by improving resistance to various forms of damage, including cracking, abrasion, and impact.

Enhanced Structural Integrity: The addition of micro PP fibers improves the structural integrity of concrete, making it suitable for a wider range of applications and ensuring longer-lasting structures.

Easy to Use: Micro PP fibers are typically provided in a form that is easy to handle and mix with concrete, making them convenient for construction projects.

Cost-Effective: Using micro PP fibers can be cost-effective in the long run by reducing maintenance costs and increasing the lifespan of concrete structures.

Versatility: Micro PP fibers can be used in various types of concrete mixes, including normal concrete, high-strength concrete, and self-consolidating concrete, making them versatile for different construction needs.

It’s important to note that while micro PP fibers offer many advantages, their effectiveness depends on factors such as the type of concrete mix, fiber dosage, and specific project requirements. Therefore, it’s crucial to consult with concrete experts and engineers to determine the appropriate application and dosage for specific projects.