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Sikacrete® UW-10

Shrinkage compensated cementitious microconcrete for underwater application

Sikacrete® UW-10 is a ready to use, cementitious microconcrete that can be used for applications under water. The microconcrete, when properly mixed, will have no significant 'wash out' of the cement phase.
Sikacrete® UW-10 is a blend of portland cement, carefully selected and graded aggregates, and Sika admixtures, enabling it to achieve excellent flow, non washout characteristics and high compressive strength. Suitable for use in hot and tropical climatic conditions.

  • No significant 'wash-out' of cement phase when placed underwater.
  • Effectively displaces water
  • Shrinkage compensated
  • Does not segregate or bleed
  • Good impact, vibration & thermal resistance
  • Non-corrosive to steel and iron
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Usage

Sikacrete® UW-10 can be used for applications underwater, for reinstating concrete:
  • Bridge columns
  • Pillars
  • Piles
  • Slipways
  • Dams
 

Advantages

  • No significant 'wash-out' of cement phase when placed underwater.
  • Effectively displaces water
  • Shrinkage compensated
  • Does not segregate or bleed
  • Good impact, vibration & thermal resistance
  • Non-corrosive to steel and iron

Packaging

40 kg bag

Colour

Grey powder

Product Details

Product Information

Composition

Portland cement, selected fillers and aggregates, special additives.

Shelf life

12 months minimum from date of production.

Storage conditions

Store in original unopened packaging in cool and dry condition between 5 °C and 35 °C. Protect from direct sunlight, heat and moisture.

Maximum Grain Size

10 mm

 
Technical Information

Compressive Strength

4.1 L water per bag

1 Day

7 Day

28 Day

w/p ratio = 0.1025

~35 N/mm2

~48 N/mm2

~65 N/mm2

Tensile Adhesion Strength

≥ 1.5 N/mm2 (28 d)

Application

Application Information

Mixing Ratio

4.0 - 4.2 L of water per 40 kg bag

Fresh Mortar Density

~2.4 kg/l

Layer Thickness

under water

above water

Min. 50 mm

Min. 50 mm

Max. 1000 mm

Max. 500 mm

Pot Life

~3 h (25 °C)
Consumption

Yield

~18.5 L per 40 kg bag
Application steps

MIXING

Mixing Equipment:
Sikacrete® UW-10 must be mechanically mixed using force action mixer.
It is essential that mixing is carried out in a manner so that the grouting operation may continue without interruption.

 
Mixing:

Always empty the full contents of the bag into a suitable mixer.
Do not mix by hand or mix part bags!
For best results, first add 3.4 to 3.5 litre of water and mix for at least 3 minutes or until the larger aggregate has thoroughly dispersed and a uniform, free flowing consistency is obtained. Then add remaining water and mix for additional 2 minutes.

Leave Sikacrete® UW-10 to stand in the normal mixing vessel until the majority of entrained air bubbles have dispersed. Do not add more water to increase flow of grout if a mix has stiffened due to time delays. If grout is unworkable, discard.

APPLICATION

Placement:
Sikacrete® UW-10 can be poured or pumped through a flexible tube (minimum diameter of 250mm) to the lowest section of the formwork. The grout flow must be restricted during the pour so that water is not entrapped. The flexible tube can be raised to reduce back pressure, however, it should never be raised above the surface level of the grout.

Curing:
Curing will not be required in submerged situations. However, grout cast above the water should be cured using suitable methods such as plastic sheeting, wet hessian, or Sika Antisol WB curing agent.

CLEANING OF EQUIPMENT

Clean equipment and mixer after application with water. Hardened material can only be removed mechanically.

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