Polypropylene staple fiber
The bundle monofilament polypropylene anti crack engineering fiber products produced by our company are manufactured by hot extrusion of pure polypropylene particles in a continuous process. The fiber is made of modified masterbatch added to polypropylene chips for blending, spinning and stretching, and is used as an engineering fiber for crack resistance and seepage prevention of mortar concrete. The fiber has been treated with special anti-static and anti ultraviolet treatment, so that the fiber is evenly dispersed in the concrete and can play its role for a long time. The "Y" section of the fiber increases the surface area of the fiber. After chemical grafting and physical modification, the fiber has a rough and porous surface, which greatly improves the binding force between the fiber and the cement base material. When monofilament polypropylene fiber is added into the concrete base material, it can be quickly and easily mixed evenly with the mortar concrete material. Because of the fine fiber and large specific surface area, there are nearly 20 fibers per 1cm3 of concrete, so a random support system can be formed inside the concrete, which can effectively control the generation and development of early plastic shrinkage, dry shrinkage and other non structural cracks of concrete and cement mortar, effectively prevent aggregate segregation, and prevent the formation of settlement cracks

function:
Greatly improve the crack resistance of concrete/mortar
In concrete/mortar, the random distribution form of fiber can greatly weaken the plastic shrinkage of concrete/mortar and the stress during freezing and thawing, and the energy of shrinkage can be distributed to tens of millions of fiber monofilaments with high tensile strength and relatively low weak modulus per cubic meter, thus effectively enhancing the toughness of concrete/mortar and inhibiting the generation and development of micro cracks. The experiment shows that, compared with ordinary concrete/mortar, if the fiber with volume permeability of 0.1% (about 0.9 kg/m3) is added, the crack resistance of concrete/mortar can be improved by about 70%.
Greatly improve the waterproof and impermeability of concrete/mortar
A large number of "engineering fibers" uniformly distributed in the concrete/mortar, which intersect and stagger with each other, play the role of "supporting" the aggregate, reducing the segregation of water and aggregate on the concrete/mortar surface: the impermeability of polypropylene fiber reinforced concrete with 0.9 g/cm3 permeability is 60% - 70% higher than that of ordinary concrete. In terms of concrete septic tank, basement project, roof, water storage tank, external wall plastering, etc., the effect of using engineering fiber as waterproof material is particularly significant, which can effectively solve the problem of seepage.
Enhance impact resistance and seismic resistance
After the concrete/mortar added with fiber products is solidified, the high-strength fibers holding the cement are bonded to form a dense and randomly distributed network reinforcement system, which increases the toughness of the concrete/mortar and the ultimate tensile ratio. When concrete is impacted, fiber absorbs a lot of energy, which enhances the impact resistance and seismic resistance of concrete/mortar. This feature is very useful for some concrete/mortar structures that are vulnerable to impact fatigue, such as roads, sidewalks, parking lots, aprons, warehouse floors, national defense facilities, etc.
Improving the frost resistance of concrete can alleviate the effect of internal stress of concrete caused by temperature change and prevent the expansion of temperature cracks. Both practice and research show that adding Fangtai fiber to concrete can be an effective means of concrete temperature difference compensation and crack resistance.
Improve the quality of concrete products, effectively maintain the integrity of the edges, corners and surfaces of the products, and prevent the rebar in the products from corrosion. At the same time, due to the effective improvement of the bleeding, it is very helpful for the early maintenance.

Purpose:

Suitable for all types of concrete buildings. The service life of the building can be improved by reducing the concrete cracks, enhancing the impermeability and toughness of the concrete.
1. It is applicable to shotcrete on the walls and tops of tunnels, mines, subways, civil air defense projects, etc. The rebound and fall off of concrete shall not exceed 4-5%
2. Dams, reservoirs, canals and swimming pools. Reduce cracking, reduce permeability and increase corrosion resistance.
3. It is applicable to the occasions with high requirements for fatigue resistance, impact resistance and durability indicators, such as docks, highways, bridges, street concrete pavements, airports, etc.
4. Precast concrete slabs, pipes, etc. It can increase the resistance to breakage and reduce shrinkage and settlement cracks.
usage method:
1. Add 0.6-1.2kg per cubic meter of mortar/concrete; It is generally 0.9 kg per cubic meter.
2. Fiber length: the fiber length recommended for ordinary concrete is 15-19mm, and the fiber length of concrete or mortar used for plastering, surface course and leveling course is 8-12mm.
3. Mixer type: forced mixer is recommended.
4. Mixing process: the mixture can be loaded before or after, or at the same time.
5. Mixing time: usually unchanged or slightly extended. Prolonged stirring will not affect fiber dispersion and fiber strength, nor cause agglomeration.
6. Proportioning design: fiber reinforcement is a physical process, not a chemical process. There is no need to increase the water volume or change the proportion of ingredients in the concrete proportion.
7. Curing: after adding fiber, there is no special curing requirement, and only the original specification needs to be followed.
8. Surface treatment: the addition of fiber will not affect any treatment and coating of concrete surface.
Packaging, storage and transportation: 

18kg per bag (20 bags inside, 0.9kg per bag), and other packages can also be provided according to user needs.
Performance and application:
1. Good chemical stability, safe and non-toxic, acid and alkali resistant, magnetic and rust resistant.
2. The fiber has good dispersion, Y-shaped section, large specific surface area and strong adhesion between rough and porous materials and water-based materials, without merging, winding and agglomeration.
3. Construction suggestions are economical and reliable. There is no need to change the original concrete mortar ratio.
4. There is no limit on the minimum concrete coverage.
5. It is easy to use and can be directly mixed with concrete.
Precautions:
1. It can not be replaced or used as structural reinforcement material, and can only play an auxiliary role in reinforcement.
2. It cannot be used alone to solve settlement and crack resistance under strong external impact.
3. The size of the main structure shall not be reduced due to the use of crack resistant fibers.
4. It is not allowed to use crack resistant fiber without following the relevant national regulations and practices for construction and maintenance.