Crack-resistant and tensile fibers

Crack and tear-resistant fiber

A type is made from polypropylene, refined through a unique process and equipment involving melting, extrusion, drawing, and cutting. It is a crack-resistant fiber specifically designed to be added to mortar and cement concrete to provide crack resistance and water resistance. To ensure the fiber disperses well in mortar and cement concrete, a special surface treatment process is applied before cutting. Due to its primary use of polypropylene, it is also referred to as polypropylene fiber.

One type is the cellulose fiber, which is made from a special plant species in cold regions and processed through a series of unique chemical treatments and mechanical operations. It inherently possesses natural hydrophilicity and high strength and modulus. Being naturally grown through cell division of plant cells and not artificially made, it offers a strong gripping surface. During further processing, the fibers are shaped into sheet monomers using special non-polar materials, facilitating their transport and application. When immersed in water and subjected to the friction of a mixer, the sheet monomers easily disperse into fiber filaments, thereby providing anti-cracking effects. This effectively enhances the mechanical properties, frost resistance, and impermeability of concrete.

Fibers of other materials and forms not mentioned should be applicable for use in concrete fibers if they meet the following conditions: (1) uniformly dispersed when added to concrete; (2) not corroded or melted; (3) environmentally friendly and non-polluting; (4) good workability with concrete; and (5) capable of effectively improving certain properties of concrete.

Concrete and mortar include not only cement concrete and mortar but also asphalt concrete and its mortar, with the latter requiring a special heat resistance test for fiber selection. Fibers of any form and material used for purposes other than the exterior of concrete are not included.