Crack-resistant fiber is a type made from 100% polypropylene, meticulously refined through a unique process and equipment, involving melting, extrusion, drawing, and cutting. It is a specialized fiber designed to be added to mortar and concrete to enhance crack resistance and prevent seepage.
To ensure that the crack-resistant fiber can disperse well in mortar and cement concrete, the fiber undergoes special surface treatment before cutting. As it primarily uses polypropylene as the raw material, it is also known as polypropylene fiber. The crack-resistant fiber, acting in mortar and cement concrete, prevents the formation and development of cracks in these materials through its unique tensile strength, dispersibility, melting ignition point, and resistance to acidity and alkalinity.
Crack-resistant fiber, a type of cellulose fiber, is derived from a special plant species in cold regions and produced through a series of unique chemical treatments and mechanical processing. It inherently possesses natural hydrophilicity and high strength and modulus. As it grows naturally through the splitting of plant cells without artificial manufacturing, it offers a strong grip on the surface. In the subsequent processing, the fibers are shaped into sheet monomers using special materials, facilitating transportation and application. When immersed in water and subjected to the friction of a blender, the sheet monomers easily disperse into fiber filaments, thereby providing crack resistance. This effectively enhances the mechanical properties, frost-thaw resistance, and impermeability of concrete.
Fibers of other materials and forms not mentioned should be applicable in concrete fibers if they meet the following conditions: (1) evenly dispersed when added to concrete; (2) not corroded or melted; (3) environmentally friendly and non-polluting; (4) good workability with concrete; (5) effectively improve certain properties of concrete.
Concrete and mortar include not only cement concrete and mortar but also asphalt concrete and its mortar, though the latter requires 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.
