Polypropylene reticular fibers are designed for concrete and are a bundle of interconnected woven fibrous threads. When the polypropylene fiber is mixed into the concrete at a rate of 0.9 kg per cubic meter, the bundled wire will be opened by the impact of sand, cement and aggregate with the stirring, and become a myriad of individual fibers, which are uniformly mixed in the concrete. . Medium Style,Brief Mesh Lining Short,Man Swim Suits,Mens Long Swim Shorts shaoxing junjia textile co.,ltd , https://www.junswim.com
â—Structural design: Although the incorporation of polypropylene fiber can significantly improve the performance of concrete, in general, polypropylene fiber is still used as a "secondary reinforcing rib" for concrete to prevent concrete from shrinking and cracking and prolonging the service life of concrete. Instead of the “main reinforcing ribsâ€, the main loads of the structure are assumed. A large number of tests have also confirmed that although the number of fiber monofilaments obtained after dispersion of polypropylene reticular fibers is large, the volume fraction of 0.9-1.8 kg of polypropylene reticular fibers per cubic meter of concrete is converted into a volume fraction of only 0.1%-0.2. %, so there is no significant influence on the compressive strength, elastic modulus and other parameters of concrete. It is recommended that the blending of polypropylene mesh fibers does not change the reinforcement ratio of the main force ribs in the original design.
â— Length selection: The length of polypropylene fiber in general engineering is 20mm.
â— Proportion design: Under normal circumstances, in the concrete, the polypropylene mesh fiber content is 0.9kg, the bridge deck waterproof layer is 1.8kg, and the amount of other materials does not need to be changed. When there is a special purpose, the polypropylene mesh fiber content and the concrete ratio can be determined through experiments. For concrete mixed with silica fume, fly ash, ground slag, zeolite powder and other active mixed materials, the use of reticular fibers is better.
â— Mixer selection: Forced mixer must be used.
â— Feeding process: first put the gravel, then put the fiber, then put it into the sand and stir for two minutes, so that the fiber is fully opened, then put the cement and water and mix well. It can also be applied in the order of conventional process input, but the mixing time should be extended appropriately to make the fibers evenly dispersed.
â— Stirring time: The purpose of the stirring is that the fiber web can be sufficiently dispersed into a monofilament or a mesh structure to be opened. Under normal circumstances, after the polypropylene mesh fiber is put into the fiber, it can be stirred for 2 - 3 minutes.
â— Molding process: There are no special requirements, but the concrete should be fully ground.
â— Maintenance process: no special requirements, can be carried out according to the maintenance process of normal concrete. The early curing of concrete cannot be relaxed by the incorporation of reticular fibers.
â— Durability of polypropylene reticular fiber: Any organic material will gradually age under the combined action of heat, light, oxygen and other factors, losing excellent performance, but the use of reticular fiber does not have such problems, because the fiber is placed It is completely protected in concrete.