Polypropylene fibers for increasing concrete performances

1. CRACKSTOP – Monofilament polypropylene fibers for preventing cracking of concrete 

Classic steel reinforcement, even properly designed, does not prevent or significantly reduce the cracking tendency of concrete, it just maintain the crack opening after they have already formed. Also, steel reinforcement can get rusted if the pH value of concrete decrease for some reason under the critical value thus affecting the structural integrity.

Crackstop is a patented range of monofilament polypropylene fibers that reduce the occurrence of plastic shrinkage and plastic settlement cracking, whilst enhancing the surface properties and the durability of hardened cementitious products. The fibers are extremely fine, single filaments, measuring 18 microns in diameter, cut to lengths of 3 and 19 mm, in accordance with maximum aggregate size considerations and surface appearance requirements. The fibers are coated with a surfactant to improve initial dispersion and bonding. Crackstop fibers are extremely fine and, although slightly visible in the plastic state, are not readily seen on the hardened surface.

 

Advantages and Benefits

  • Reduced plastic shrinkage cracks
  • Reduced plastic settlements
  • Reduced bleeding
  • Alternative to crack control mesh
  • Increased abrasion properties
  • Increased impact resistance
  • Improved freeze/thaw resistance
  • Reduced water & chemical permeability

 

Applications

  • Internal floor slabs
  • External hard standings
  • Bridges
  • Precast concrete
  • Agricultural areas
  • Shtocrete/Gunite
  • Water retaining structures
  • Piling concrete
  • Repair materials
  • Pattern imprinted concrete
  • Road pavements
  • Extruded concrete
  • Runway aprons
  • Sea defense
  • Renders and plasters

 

Download TDS Crackstop

 

Technical Data

Characteristics

Performances

Material

Pure polypropylene

Surface

Coated for dispersion

Design

Monofilament

Length

3, 6, 12, 18 mm

Density

0.91 gm nominal

Color

natural

Absorption

NIL

Specific area of fibers

250m2 / kg

Melting point

1600 C

Ignition point

3650 C

Thermal conductivity

low

Electric conductivity

low

Acid resistance

high

Alkali resistance

high

Minimum dosage

0.6 kg/m3

Tenacity Cn/dtex

34.0 min

 

2. DURUS S400 – Embossed polypropylene macro fibers for concrete reinforcement

Durus S400 is a range of embossed macro synthetic fibers, cut to the length of 45 mm and 55 mm, for a wide range of concrete applications. Durus S400 can be used for fresh concrete, prefabricated concrete and shotcrete applications, for underground or above grade constructions. Fibers’ embossing improves the adherence to concrete and the overall concrete performances.

 

Advantages and benefits

  • The product will enhance the toughness of the concrete and alleviate the need for steel mesh.
  • When used with the appropriate design and at the recommended dosage.
  • Can be used as an alternative to steel reinforcement.
  • Easier and safer to handle than steel reinforcement.
  • Construction time is decreased.
  • No risk of being misplaced.
  • No need for cutting, fixing and placing steel mesh.
  • Reduced wear on concrete pumps.
  • Does not rust or corroded.
  • Offers a 3-Dimensional reinforcement system.

 

Applications

  • Internal floor slabs
  • External hardstandings and pavements
  • Precast concrete elements
  • Agricultural areas
  • Marine / coastal defense concrete
  • Sprayed concrete

  

 

Download Durus S400 – 45 mm TDS

Download Durus S400 – 55 mm TDS

 

Technical details

Durus S400

(45 and 55 mm)

Density

Melting point

Ignition temperature

Polypropylene

0.905 kg/dm³

165 °C

>360°C

 

Physical and Mechanical Properties

Standard

Performance

Tolerance

Durus 45

Durus 55

Durus 45

Durus 55

Equivalent Diameter

EN14889-2

0.9 mm

0.9 mm

+/-0,05 mm

+/-0,05 mm

Length

EN14889-2

45 mm

55 mm

+/-2 mm

+/-3 mm

Aspect ratio

EN14889-2

50

61

+/- 5

+/- 6

Number of fibers / kg

 

38600

31600

 

 

Elastic modulus

EN14889-2

3350 MPa

3350 MPa

-335 MPa

-335 MPa

Tensile strength

EN14889-2

465 MPa

465 MPa

-35 MPa

-35 MPa

 

 

 

 

 

 

Effect on consistency and strenght of concrete

Standard

Performance

Dosage

 

 

Durus 45

Durus 55

Durus 45

Durus 55

Vebe time

EN14889-2

2 s

2 s

5 kg

5 kg

Control concrete

EN14889-2

1 s

1 s

 

 

Strength @CMOD- 0.5mm

EN14889-2

1,5 N/mm²

1,7 N/mm²

5 kg

5 kg

Strength @CMOD- 3.5mm

EN14889-2

1.7 N/mm²

2.1 N/mm²