STRUX® 90/40

Advanced synthetic macro fibre reinforcement that controls shrinkage cracking in concrete

Product Description

STRUX® 90/40 is a unique, high strength, high modulus synthetic macro fibre reinforcement that is added to ready-mix and precast concrete at the batching stage. STRUX® 90/40 controls drying shrinkage cracking, so can be used as an alternative to steel fabric and steel fibre reinforcement. STRUX® 90/40 conforms to EN 14889-2, Fibres for concrete - Part 2: Polymer fibres - Definitions, specifications and conformity.

Advantages

  • Controls drying shrinkage cracking by controlling the propagation of micro-cracking - improves toughness and durability of concrete.
  • Can be used as an alternative to steel fabric reinforcement and steel fibre reinforcement.
  • Uniformly distributed throughout the concrete matrix - no risk of incorrect steel fabric reinforcement placement.
  • Improves residual flexural strength, impact and fatigue resistance of concrete - Re,3 values in excess of 30% can be reliably achieved (see Concrete Society Technical Report 34, 3rd Edition).
  • Removes a site process so saves time on construction programme.
  • No steel fabric storage, movement or crane costs.
  • No risk of injuries from moving and installing steel fabric reinforcement.
  • Ready-mix concrete truck can back up and freely discharge concrete, could remove/ reduce pumping costs.

Applications

  • Ground bearing floor slabs
  • External pavements
  • Composite steel deck flooring
  • Precast concrete

Note: STRUX® 90/40 is not intended as a substitute for steel reinforcement in any application other than those listed. Always consult relevant national and European codes

    Addition Rates

    STRUX® 90/40 addition rates are dependent on the specific application. Addition rates are also dependant on the desired hardened concrete properties and will vary between 2.3 to 7.0 kg/m3. Please see STRUX® 90/40 engineering bulletin for detailed information.

    Comparison of STRUX® 90/40 and Other Types of Reinforcement

    Reinforcement Type Reduces Provides
    Plastic shrinkage cracking Drying shrinkage cracking Corrosion risk Freeze/thaw damage Safe easy handling Quick, well controlled installation Post– crack load carrying capacity
    Polypropylene
    “Micro” fibres
    + - + +/- + + -
    Steel fibres - + - - - + +
    Steel fabric - + - - - - +
    STRUX® 90/40 + + + - + + +
    + = positive effect         (1) Only if positioned in top third of floor slab
    – = no effect                  (2) Only if positioned in bottom third of floor slab

    Mix Design and Mixing Requirements

    STRUX® 90/40 may require the use of a superplasticiser such as ADVA® to achieve the required workability. In addition, slight increases in fine aggregate contents may be needed. At dry batch ready-mix plants, add the STRUX® 90/40 bags to the truck before the concrete constituents. STRUX® 90/40 bags are water degradable and will degrade when wetted. At wet batch ready-mix plants, add the STRUX® 90/40 bags to the truck before the concrete constituents. Add the first batch of concrete constituents to the truck SEMIDRY. This will break up the STRUX® 90/40 bags and evenly disperse the fibres. Remember to make up the water content on subsequent batches. After fibre addition, the concrete must be mixed in a drum at the recommended mixing speed for a minimum of 70 revolutions to ensure adequate dispersion. Please contact GCP for further information.

    Compatibility

    STRUX® 90/40 is compatible with all GCP admixtures. The action of STRUX® 90/40 in concrete is mechanical and will not affect the hydration process of the cement. Each liquid admixture should be added separately to the concrete mix.

    Packaging

    STRUX® 90/40 is available in 2.3 kg concrete-ready bags.

    Technical Data

    STRUX® 90/40
    Specific Gravity (20°C) 0.92
    Absorption None
    Modulus of Elasticity 9.5GPa
    Tensile Strength 620 MPa.
    Melting Point 160°C
    Ignition Point 590°C
    Alkali, Acid & Salt Resistance High

    Effect of STRUX® 90/40 Dosage on Residual Strength

    Note: These curves are based on averages of several beam tests. The toughness performance will depend on the concrete mix design used

    STRUX® 90/40 dosage rate (kg/m3) fe,3 (MPa) Re,3 (%)
    3.8 1.95 38%
    4.6 2.40 46%
    5.4 2.75 54%

    Note:
    These figures (fe,3 and Re,3) are indicative of the performance of concrete mixes containing STRUX® 90/40 but they will vary depending on the hardened properties of the concrete. It is reasonable to expect higher figures when tested in other concrete mixes

    Note:
    The addition of STRUX® 90/40 fibres, to control plastic shrinkage cracking, does not negate the need for appropriate and efficient curing techniques.

    + = positive effect         (1) Only if positioned in top third of floor slab
    – = no effect                  (2) Only if positioned in bottom third of floor slab

    Mix Design and Mixing Requirements

    STRUX® 90/40 may require the use of a superplasticiser such as ADVA® to achieve the required workability. In addition, slight increases in fine aggregate contents may be needed.

    At dry batch ready-mix plants, add the STRUX® 90/40 bags to the truck before the concrete constituents. STRUX® 90/40 bags are water degradable and will degrade when wetted. At wet batch ready-mix plants, add the STRUX® 90/40 bags to the truck before the concrete constituents.

    Add the first batch of concrete constituents to the truck SEMIDRY. This will break up the STRUX® 90/40 bags and evenly disperse the fibres. Remember to make up the water content on subsequent batches. After fibre addition, the concrete must be mixed in a drum at the recommended mixing speed for a minimum of 70 revolutions to ensure adequate dispersion. Please contact GCP for further information.

    Compatibility

    STRUX® 90/40 is compatible with all GCP admixtures. The action of STRUX® 90/40 in concrete is mechanical and will not affect the hydration process of the cement. Each liquid admixture should be added separately to the concrete mix.

    Packaging

    STRUX® 90/40 is available in 2.3 kg concrete-ready bags.

    Technical Data

    Specific Gravity 0.92
    Absorption None
    Modulus of Elasticity 9.5 GPa
    Tensile Strength 620 MPa.
    Melting Point 160°C
    Ignition Point 590°C
    Alkali, Acid & Salt Resistance High

    Effect of STRUX® 90/40 Dosage on Residual Strength

    Note: These curves are based on averages of several beam tests. The toughness performance will depend on the concrete mix design used.
    STRUX® 90/40 DOSAGE RATE (KG/M3) FE,3 (MPA) RE,3 (%)
    3.8 1.95 38%
    4.6 2.40 46%
    5.4 2.75 54%

    Note: These figures (fe,3 and Re,3) are indicative of the performance of concrete mixes containing STRUX® 90/40 but they will vary depending on the hardened properties of the concrete. It is reasonable to expect higher figures when tested in other concrete mixes.

    Note: The addition of STRUX® 90/40 fibres, to control plastic shrinkage cracking, does not negate the need for appropriate and efficient curing techniques

     

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    Last Updated: 2022-11-24

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