Product Data Sheet
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SikaGrout® UW-MY

Shrinkage compensated cementitious grout for underwater applications

SikaGrout® UW-MY is a ready to use, cementitious grout that can be used for applications underwater. The grout, when properly mixed, will have no significant ‘wash out’ of the cement phase. SikaGrout® UW-MY 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.

  • There is no significant ‘wash-out’ of cement paste when placed underwater
  • Effectively displaces water
  • Shrinkage compensating properties
  • High early & 28-day strengths
  • Does not segregate or bleed
  • Good impact, vibration and thermal resistance
  • Non-corrosive to steel or iron
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Product Data Sheet
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Usage

SikaGrout® UW-MY can be used for free flowing or pumped grout applications underwater, for reinstating concrete, such as:
  • Bridge columns
  • Pillars
  • Piles
  • Spilways
  • Dams
 

Advantages

  • There is no significant ‘wash-out’ of cement paste when placed underwater
  • Effectively displaces water
  • Shrinkage compensating properties
  • High early & 28-day strengths
  • Does not segregate or bleed
  • Good impact, vibration and thermal resistance
  • Non-corrosive to steel or iron

Packaging

25 kg bag

Colour

Grey powder

Product Details

Product Information

Shelf Life

6 months from date of production

Storage Conditions

Store properly in undamaged and unopened, original sealed packaging, in dry conditions between +10 °C to +30 °C. Protect from direct sunlight, rain and water.
Technical Information

Compressive Strength

1 day

15 MPa

7 days

40 MPa

28 days

60 MPa

Application

Application Information

Mixing Ratio

Add 4.3–4.7 litres of water per 25 kg bag

Fresh Mortar Density

~2 200 kg/m³ (depending on consistency and temperature)

Setting Time

Initial

~4 hours

Final

~5 hours
Consumption

Yield

13.3 L per 25 kg bag
Application steps

MIXING

SikaGrout® UW-MY must be mechanically mixed using a mechanical forced action grout mixer (maximum speed: 500 rpm). It is essential that mixing is carried out in a manner so that the grouting operation may continue without interruption.

SikaGrout® UW-MY shall be mixed using clean water. Add the powder to approximately 80 % of the total water content while mixing. The remaining 20 % of the water component is to be added while continuing to mix. The total water content is 4.3–4.7 l for each 25 kg bag of powder. Mix the grout until it appears homogenous. Allow to stand so any entrapped air can escape. 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

SikaGrout® UW-MY can be poured or pumped through a flexible tube (minimum diameter of 50 mm) to the lowest section of the form. The grout flow must be restricted during the pour so that the water is not entrapped. The outlet of the flexible tube can be raised to reduce pressure; however, it should never be raised above the surface level of the grout. SikaGrout® UW-MY can be placed in thickness of up to 50 mm above water, and 100 mm underwater. Any grout pour that exceeds this thickness should be done in stages, or have stone aggregate added to it, to reduce the exothermic heat.
When adding aggregate, use smooth rounded aggregate, ranging from 2 mm to 10 mm.

 

CURING TREATMENT

Curing will not be required in submerged situations. Grout cast above the water should be cured using suitable methods such as plastic sheeting, wet hessian, or Antisol® liquid membranes.

CLEANING OF TOOLS

Clean all tools and application equipment with hot water immediately after use. Hardened or cured material can only be mechanically removed.

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