Polypropylene fibers for mortar or Concrete
Polypropylene fibers are designed as a new engineering material specially used to reinforce mortar/concrete and prevent them from cracking and water penetration. They are manufactured by unique processes, and have very good performances such as high chemical stability, high corrosion resistance. They can form structures in three dimensional distributions after being put into mortar/concrete, and enhance bond with mortar or concrete, therefore, they can effectively reduce and prevent mortar or concrete from early plastic cracking and greatly improve the frost resistance, plastic shrinkage resistance, reduce water penetration etc.
I. Typical properties of Polypropylene fibers
Diameter of fiber (μm)	20、30、48	Length of fiber (mm)	（3）、5、8、15、19、（12）
Strength of fracture (Mpa)	≥400	Density (g/cm^3)	0.91
Initial Modulus (Gpa)	≥3.5	Elongation at breaking (%)	15-35
Melting point (℃)	About 165	Igniting point (℃)	About 580
Acid resistance	Excellent	Security	Innocuity
Alkali resistance	Excellent	Heat conduction	Very low
Thermal conductivity	Low	Electrical conductivity	Low
Performances at low temperature	Excellent	Anti-magnetic	Excellent
II. Performances of mortar or concrete reinforced by polypropylene fiber
The PP polypropylene fibers with trifoliate cross section are manufactured by special technology, and the surface is also handled by special chemical treatment, therefore, the fibers can be dispersed homogeneously and the bond strength with mortar or concrete is greatly increased。Thus, the performances of mortar or concrete are improved. As a kind of secondary reinforced engineering material, the PP polypropylene fiber play an important part in improving permeability and minimizing cracks as plastic concrete shrinks.
III. Applications
The polypropylene fibers are widely used in mortar or concrete. PP polypropylene fiber are ideal for applications where a tough，crack-resistant，corrosion-resistant concrete is required，as in： commercial、industrial、residential buildings and floorings，highways, bridge deck overlays； airport runways, taxiways，water conservancy and hydropower, municipal road and bridge construction，parking lot, driveway, cast-in-place retaining wall，sea walls, port or marine structures；linings and pavements for mines and tunnels，blast-resistant structures。
IV. Standard dosage rate and Mixing process
Standard dosage rate is 0.9Kg per/cubic meter of concrete for the fiber that its diameter is 30、48μm ,For certain applications, the fiber dosage can be decreased to 0.45-06Kg per cubic meter of concrete for the fiber with diameter of 20μm.The mixing process is the same as common cement concrete, no special requirements. But if PP fibers are added after mixing conventional concrete materials, you had better continue to mix the materials for 30-60 more seconds in order to make fibers disperse homogeneously.
V. Package
Bag of fiber for concrete weights 0.9 Kg, bag of fiber for cement weights 1.0Kg. In addition, we can supply proper specs of package according to the customers’ requirements.

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