Application of Polypropylene Fiber in Special Purpose Concrete

Application of Polypropylene Fiber in Special Purpose Concrete

Key words
Polypropylene fiber, concrete, rubber concrete, sewage concrete

Polypropylene fiber is a kind of artificial synthetic fiber with low elastic modulus, which has the characteristics of high strength, good ductility, excellent durability and low price, and is widely used in the field of concrete products.

Polypropylene fibers are hydrophobic, preventing them from being affected by grout. Polypropylene fibers can improve the tensile properties of plastic concrete, significantly reduce its plastic shrinkage microcracks, and enable the concrete to obtain the best long-term integrity. Adding polypropylene fibers can effectively improve the tensile strength of concrete and improve its anti-cracking and anti-shrinkage properties.

Rubber concrete has the characteristics of light weight and high elasticity, sound absorption and heat insulation, impermeability and impact resistance, shock absorption and wear resistance, and has been successfully used in intercity highways, urban trails and other projects. However, in the cold regions of our country, the rubber concrete pavement is often in a low temperature environment, and the freezing and thawing effect makes the rubber concrete crack, peel off, and fall off, which seriously affects its service life.
Polypropylene fiber can improve the frost resistance of rubber concrete; the improvement effect of fiber on tensile strength is higher than that of compressive strength;

Concrete is prone to cracks due to plastic shrinkage and dry shrinkage, which greatly reduces the impermeability of concrete. Under the harsh conditions of sewage erosion, the existence of cracks will allow some harmful substances to enter the interior of reinforced concrete and chemically react with steel bars. Concave, easy to cause accelerated corrosion of concrete and internal steel bars. In the construction of sewage treatment system, in order to achieve the overall design effect and meet the requirements of no seepage, no leakage and no cracking, polypropylene fibers are often used to improve the crack resistance of concrete.