Polypropylene fiber applications

Published on:

2019-05-18

Polypropylene fiber is a high-strength polypropylene bundle monofilament fiber with special surface treatment technology to ensure excellent fiber dispersion in the concrete and grip with the cement body. It is generally used in fine stone concrete. Concrete fiber (concrete recommended to use 12-19mm concrete special fiber strength and good anti-cracking effect.) Tensile strength of 500mpa or more Elongation at break 15-25% Modulus of elasticity > 3800mp
    1、Effectively improve the anti-cracking ability of mortar and concrete. Experimental evidence: compared with ordinary mortar/concrete, such as adding 0.1% by volume (about 0.9Kg/m3) of monofilament fiber, mortar/concrete crack resistance increased by 70%.
    2, greatly improve the seepage resistance of concrete. 0.9Kg/m3 dose of polypropylene bundle monofilament fiber concrete than the ordinary concrete seepage resistance increased by 60% to 70%.
    3, significantly improve the impact resistance and wear resistance of concrete. Polypropylene fiber, although the stiffness is low, the ability to transfer the load is poor, but can absorb impact energy, effectively reduce the gap, enhance the continuity of the medium material, reduce the impact wave is blocked caused by the local stress concentration phenomenon, and thus can greatly improve the impact resistance of concrete and toughness.
    4, improve the frost resistance of concrete. The addition of polypropylene fiber in the concrete, can relieve the role of temperature changes caused by the internal stress of concrete to prevent the expansion of temperature cracks; at the same time, the improvement of concrete impermeability is also conducive to its ability to improve frost resistance. Practice and research have shown that the addition of polypropylene fiber in concrete can be used as an effective means of concrete temperature compensation anti-cracking.
    5、Improve the quality of concrete products, effectively maintain the integrity of the edges, corners and surfaces of the products, so that the reinforcement within the products are not subject to corrosion. Mortar fiber (mortar recommended 3-12mm mortar special fiber dispersion performance good toughness can effectively prevent pilling mortar fiber performance than: mortar to add fiber is mainly, give mortar a certain toughness, improve the mortar crack resistance, inhibit the mortar early crack generation, mainly have the following role.
    (1) blocking crack, stop the expansion of the original defects in the mortar matrix and effectively delay the appearance of cracks.
    (2) Anti-seepage: improve the compactness of the mortar matrix and prevent the invasion of external water.
    (3) Durability: improve the performance of mortar matrix such as frost resistance and fatigue resistance, and improve its durability.
    (4) Impact resistance: improve the ability of mortar matrix to withstand deformation, thus improving its toughness and impact resistance.
    (5) Tensile: the use of fiber can play a role in improving the tensile strength of the matrix.
    (6) high toughness: mortar fiber has high toughness and strength, in the mortar mixing is not easy to bend into a ball, mesh polypropylene fibers whose appearance for multiple fiber monofilament interconnected mesh structure. When the polypropylene mesh fiber into the concrete, in the concrete mixing process, the lateral connection between the fiber monofilament by the concrete itself rubbing and friction and destruction, the formation of fiber monofilament or mesh structure fully open, so as to achieve the effect of a large number of polypropylene fibers evenly mixed into the concrete.