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By TRUNNANO | 02 January 2024 | 0 Comments

What role does adding polypropylene fiber to concrete play?

Concrete is a brittle material with high compressive and relatively low tensile strength. With the continuous development of modern construction technology, higher requirements have been put forward for cement concrete. Therefore, it is developing in the direction of high strength, toughness, crack resistance, durability, and volume stability. Organic synthetic fibers are often used to modify concrete, which can significantly increase or improve the crack resistance of concrete, reduce the occurrence and development of cracks, and improve the overall performance of concrete. Polypropylene fibers are often used to reinforce concrete.
1 Enhance the crack resistance of concrete
In the construction of concrete, due to excess water, a large amount of hydration heat is generated during the mixing process. Plastic shrinkage cracks are prone to occur during the pouring and molding process. Dry cracks occur when water is lost and dried. During the hardening stage, due to temperature changes, Temperature shrinkage cracks, etc., appear. Adding a small amount of polypropylene fiber to concrete can significantly increase or improve the crack resistance of concrete. It prevents the occurrence of cracks during the concrete pouring and molding process and improves crack resistance.
2 Enhance the impermeability of concrete
Concrete is a heterogeneous composite material. There are many micropores between aggregates, which have many capillary effects. As well as cracks produced when concrete dries and hardens, the impermeability of concrete is reduced. Adding a small amount of organic fibers to concrete can distribute them evenly and have good adhesion to concrete, reducing or preventing the formation, growth and development of cracks in concrete, especially greatly reducing the occurrence of connected cracks. Reduces water seepage channels.
3 Improvement of impact resistance of concrete
After organic fibers are mixed into concrete, concrete's compressive strength and flexural strength are increased to varying degrees, thereby increasing the concrete's maximum instantaneous impact resistance. In addition, because the fiber is mixed into concrete, the toughness of the concrete increases, which can better store the energy caused by impact and release the energy slowly, avoiding damage caused by energy release that is too fast.
4 Effects on the freeze-thaw resistance and chemical attack resistance of concrete
Under freeze-thaw conditions, due to temperature changes, large temperature stress is generated inside the concrete, causing the concrete to crack. A small amount of organic fibers are mixed into concrete. Since the fibers are thin and can be evenly distributed in the concrete, the number of fibers per unit area is large. The fibers can play a good constraining role and resist freezing. Expansion pressure during melt chemical attack. At the same time, the incorporation of fibers greatly improves the impermeability of concrete, which hinders the penetration of chemical substances and greatly improves the chemical resistance of concrete.
High-quality polypropylene fiber supplier
TRUNNANO is a globally recognized manufacturer and supplier of chemical compounds with over 12 years of expertise in the highest quality nanomaterials and other materials. The company develops various chemicals. Provide OEM services. If you need
polypropylene fiber, please feel free to contact us.

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