The role of polypropylene fibers in concrete now

The role of polypropylene fibers in concrete is mainly reflected in the following aspects:

1. Prevent concrete shrinkage cracks

Polypropylene fibers can effectively prevent plastic shrinkage cracks caused by surface water loss during the setting and hardening process of concrete. During the setting and hardening process of concrete, if the surface moisture evaporates too quickly, it is prone to plastic shrinkage and cracks. However, concrete mixed with polypropylene fibers can significantly reduce the occurrence of such cracks.

2. Enhance the fire resistance of concrete

Under the effect of high temperature, polypropylene fibers will first soften and burn off, forming many channels in the concrete. The water vaporized by high temperature in the concrete can be discharged along these channels, preventing the formation of internal high pressure due to water vaporization and causing the concrete to burst, thereby significantly improving the fire resistance time and fire resistance grade of the concrete.

3. Enhance the toughness of concrete

Polypropylene fibers can enhance the toughness of concrete. Although the improvement in the crack resistance of concrete is limited, it does improve the toughness of concrete to a certain extent.

4. Thickening effect

The addition of polypropylene fibers can enhance the consistency of fresh concrete, reduce segregation and bleeding of concrete, but enhanced vibration is required to ensure the density of concrete.

5. Crack resistance effect and interface effect

Polypropylene fibers can enhance the performance of concrete, improving its performance from aspects such as crack resistance effect and interface effect, reducing the generation and expansion of cracks, and extending the service life of concrete.

In conclusion, the application of polypropylene fibers in concrete can significantly improve the performance of concrete, enhancing its fire resistance, toughness and crack resistance. At the same time, it can also increase the consistency of fresh concrete, reduce segregation and bleeding. These characteristics have enabled polypropylene fibers to be widely applied in concrete engineering.