Polypropylene fibers or PP fibers are one of the new chemical fibers. Polypropylenes are produced in large quantities in the world, and after polyesters, polyamides and acrylics, they are in the fourth place in terms of production. The production rate of polypropylene fibers in the world is about 4 million polypropylene fibers per year. These fibers were first used by the US Corps of Engineers in 1965 to make blast-resistant concrete.
These fibers were used more over time; To the extent that nowadays these fibers are used in the form of compression in concrete for its reinforcement. The use of these fibers in concrete increases tensile strength, increases bending strength, increases stiffness, increases resistance to impact and improves the rupture mode of concrete.
Polypropylene fibers can be used with a lower percentage than steel fibers. Also, during the production of PP fibers, their resistance can be increased with fans. The density of these fibers is about 0.9 grams per cubic centimeter. These fibers are very crystalline (they have many irregular molecules) and therefore their hardness is very high. Also, polypropylene fibers are very resistant to chemical attacks and bacteria. The crystallinity of PP fibers (polypropylene fibers irregularity) is around 70%.
If polypropylene fibers are combined with ethylene (which is a more rigid and flexible product), the resulting product is polypropylene, which is known as engineering plastic. If the polypropylene fibers do not have a specific color, they are somewhat transparent; But usually this product is made in a matte state and if needed, color is added to it for beauty purposes. The fatigue resistance of these fibers is very good.
Since PP fibers or polypropylene fibers are well compatible with concrete, its use in concrete makes concrete acquire the properties of fibers. Another advantage of polypropylene fibers is that they are chemically neutral. This advantage makes concretes that use PP fibers more resistant to chemical attacks. If there are very strong and large amounts of chemicals in the vicinity of concrete, the concrete will be damaged at first and these fibers will remain healthy. Another advantage of using polypropylene fibers (compared to other compressed fibers) is that they do not become pelletized when mixing concrete. The property of being hydrophobic of polypropylene (PP) fibers makes it not wet with cement paste when mixing concrete, and therefore, no amount of water will be added to concrete to consume polypropylene fibers. Also, these fibers (and any other fibers) do not need to be covered with concrete.
What are polypropylene fibers?
Polypropylene fibers or concrete PP fibers are fibers that are produced from the chain polymerization of propene monomers and by the melt spinning process. These fibers are especially hard and stable and resistant to heat. In addition, they are antistatic, non-magnetic and non-conductive. But the distinctive feature of these fibers is their long life. And due to the fact that these fibers are odorless and kind to the skin, it can be used in the food, pharmaceutical and health industries without any trade. PP fibers are environmentally friendly and completely harmless.
PP polypropylene fibers are the most ideal material for reinforcement and application in concrete and construction mortars. The use of these fibers in concrete delays the formation of shrinkage cracks and reduces the crack width, and at the same time, it increases the energy absorption and fire resistance properties of concrete. But one of the most wonderful characteristics of polypropylene fibers is the reduction or elimination of reinforcements and reinforcing steels and increasing the durability and stability of the structure.
Advantages of using polypropylene fibers in construction
The special characteristics of PP fibers (polypropylene fibers) and its properties in concrete have made this material an ideal supplement for use in concrete and construction works. Polypropylene composites used in construction mainly consist of continuous or discontinuous fibers in a plastic substrate. Here are some of the benefits of using propylene as a reinforcing material:
The sale price of polypropylene fibers and the price of fiber concrete made with it are affordable.
Versatility: PP fibers are compatible with most existing processes and techniques and can be used in various applications.
Since it has the lowest specific weight among plastic materials, less amount of PP fibers will be needed to reach the final product with the desired characteristics.
Determining the right amount of polypropylene fibers
After choosing the appropriate type of reinforcing fibers, the consumption of PP fibers should be determined. It is relatively easy to determine this value in filament microfibers. In most applications, the dosage amount of 0.3 to 0.45 kg per cubic meter of concrete gives good performance. But in mesh microfibers, the common dosage is between 0.45 and 0.89 kg/m3.
What is the method of using polypropylene fibers in concrete?
Add the PP fibers to the mixer containing concrete, mortar and water with a specific dose and amount. Stir this mixture for at least 3 to 4 minutes to obtain a uniform distribution of fibers in the concrete. Then use this combination according to normal work conditions.
The mixing plan of polypropylene fiber concrete is the same as other types of fibers used in concrete. First, spread the amounts of polypropylene fibers used in concrete on the dry concrete depot and stack and mortar materials. Then mix the dry mixture of concrete materials and fibers for 2 to 3 minutes so that the fibers are evenly distributed in the cement, aggregate and sand mixture. After that, proceed according to the conditions of the normal process.
The price of pp fibers and its market
In 2020, the market size of polypropylene fibers and sales of pp fibers is more than 3.5 billion dollars, and the price of polypropylene concrete fibers is about 945 dollars per ton. It is expected to grow significantly at a CAGR of more than 3% from 2021 to 2027, and the price of PP fiber per kilo will reach more than $130,000.
Increasing population, improving economic conditions, changing living standards, rapid growth of industrial activities, especially in emerging economies, demand for durable and long-lasting products, and at the same time light products in various industries such as automobile manufacturing and construction, are the main drivers of production growth. and sale of polypropylene fibers. Afzir Company is one of the companies selling polypropylene concrete fibers, which with several years of experience in the field of supply and sale of all kinds of concrete fibers, will be with you to help you buy concrete fibers online. To buy and receive the price list of concrete fibers and PP fibers, contact our experts or leave a message on WhatsApp; Our experts will guide you as soon as possible to buy suitable polypropylene fibers for your project.
- non magnetic
- No dust absorption
- Resistant to bases
- Safe and easy to use
- Cheap price of polypropylene fibers
- Reduction and removal of concrete surface cracks
- Increased wear resistance
- Increased resistance to thawing and freezing cycles
- Increased impact resistance
- Industrial concrete floors with high and low traffic
- Concrete exposed to dynamic loads and fire
- Motorized roads and pavements,
- Retaining walls and slope guarding structures
- machinery foundation
- Reservoirs, pools and marine structures
- Making cement or Iranite sheets
- Construction of concrete wall coverings (Romalin)
- 20 kgs bags
Black $ white
6 & 12 mm
The consumption of fibers in concrete is about 0.9 kg/m3 or 0.1% of the volume of concrete (of course, this amount can vary between 0.6 kg/m3 and 3 kg/m3). This amount of PP fiber consumption replaces the cement in concrete and therefore the concrete mixing plan should be modified again based on the amount of new cement.
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Frequently Asked Questions
What are the advantages of polypropylene fibers for concrete?
PP fibers or polypropylene fibers (PPF™ code) is one of the alternative materials for steel rebar for concrete reinforcement.
What are the advantages of using polypropylene fibers?
It is more economical than other fibers, it is easy and quick to implement, it is a good alternative to concrete reinforcement and it maintains the cohesion of the concrete mix by limiting the movement of solid particles.
What is the characteristic of polypropylene fibers?
Polypropylene fiber is a type of polymer material with light weight, high strength and corrosion resistance.
What colors are there in polypropylene fibers?
Polypropylene fibers are available in white and black.
What is the resistance of polypropylene fibers against chemical reactions?
Polypropylene fibers have very good chemical resistance.
How are polypropylene fibers obtained?
It is produced through chain growth polymerization of propylene monomer.