The polypropylene mesh fiber is specially designed for concrete

The polypropylene mesh fiber is specially designed for concrete. It is a bunch of interwoven fiber-like mesh threads. When polypropylene fiber is mixed into concrete at a weight of 0.9 kg per cubic meter, the bundles of network wires will spread out after being impacted by sand, cement, and aggregates as they are stirred, and become countless individual fibers that are evenly mixed in the concrete. .
●Structural design: Although the incorporation of polypropylene fiber can significantly improve the performance of concrete, under normal circumstances, polypropylene fiber is still used as a "secondary reinforcement" of concrete to prevent shrinkage and cracking of concrete and extend the service life of concrete. Rather than "main reinforcing ribs" bear the main load of the structure. A large number of experiments have also confirmed that although the number of fiber monofilaments obtained after the polypropylene network fiber is dispersed is large, the volume ratio of 0.9kg-1.8kg polypropylene network fiber per cubic meter of concrete is only 0.1%-0.2 %, so it has no significant effect on the compressive strength and elastic modulus of concrete. It is recommended to not change the reinforcement ratio of the main force bars in the original design after the polypropylene mesh fiber is incorporated.
●Length selection: In general engineering, the length of polypropylene fiber is 20mm.
●Proportioning design: Under normal circumstances, in unilateral concrete, the appropriate content of polypropylene mesh fiber is 0.9kg, and the content of bridge deck waterproof layer is 1.8kg, and there is no need to change the amount of other materials. When there is a special purpose, the content of polypropylene mesh fiber and the proportion of concrete can be determined through experiments. For concrete mixed with active mixed materials such as silica fume, fly ash, ground slag, zeolite powder, etc., the net fiber has a better effect.
●Mixer selection: compulsory mixer must be used.
●Feeding process: first put in the crushed stone, then put in the fiber, then put in the sand and stir for two minutes to fully open the fiber, then put in the cement and water and mix well. The construction can also be carried out in the order of conventional process input, but the mixing time should be appropriately extended to make the fibers dispersed evenly.
●Mixing time: The goal of stirring is that the fiber network can be fully dispersed into monofilament or network structure is opened. Generally, after adding polypropylene mesh fiber, force mixing for 2-3 minutes.
●Forming process: No special requirements, but the concrete should be fully vibrated.
●Cure process: There is no special requirement, it can be carried out as normal concrete curing process. The early curing of concrete cannot be relaxed due to the incorporation of mesh fibers.
●Durability of polypropylene mesh fiber: any organic material will gradually age under the combined action of heat, light, oxygen and other factors, and lose its excellent performance. However, there is no such problem with the use of mesh fiber because the fiber is placed It is completely protected in concrete.