Product Data Sheet Show all documents
SikaGrout® UW

SikaGrout® UW

SHRINKAGE COMPENSATED CEMENTITIOUS GROUT FOR UNDERWATER APPLICATIONS

SikaGrout® UW is a ready to use, class A cement based grout for applications underwater.  The grout, when properly mixed, will have no significant ‘wash out’ of the cement phase.  SikaGrout® UW is a blend of Portland cement, carefully selected and graded aggregates and Sika admixtures enabling it to achieve excellent flow, non wash-out characteristics and high compressive strength.

  • Economical
  • Good resistance to ‘wash-out’ of cement phase when placed underwater.
  • Effectively displaces water.
  • Shrinkage compensating properties.
  • High early & 28 day strengths.
  • Good impact, vibration and thermal resistance.
  • Non-corrosive to steel or iron.
  • Used with Sika Pile Jacket and other pile jacket systems.
Product Data Sheet Show all documents

Usage

SikaGrout® UW can be used individually for underwater grouting or as a system in conjunction with Sika Pile Jacket systems or other confinement jacket repair systems for rehabilitation of concrete, steel and timber piles in marine applications.
  • Bridge Column repairs.
  • Piles repair.
  • Slipways.
  • Dams.
  • Underwater grouting.
 

Advantages

  • Economical
  • Good resistance to ‘wash-out’ of cement phase when placed underwater.
  • Effectively displaces water.
  • Shrinkage compensating properties.
  • High early & 28 day strengths.
  • Good impact, vibration and thermal resistance.
  • Non-corrosive to steel or iron.
  • Used with Sika Pile Jacket and other pile jacket systems.

Packaging

20kg bag, 1000kg Bulk bag to order

Colour

Grey Cement powder

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Department of Main Roads Qld (TMR) 2019, Product Index for Bridges and Other Structures, Section 5. Registered and Conforming Products, 5.33 Repair Materials (Concrete) – Grouts
Product Information

Composition

Cementitious powder

Shelf life

12 months when stored in original sealed packaging in dry conditions.

Storage conditions

Store SikaGrout UW in dry conditions in un-opened original packaging.

Maximum grain size

Maximum aggregate size approx. 2mm

Density

2,200 kg/m3 approx.(mixed)

 
Technical Information

Compressive strength

1 day

~ 20 MPa

7 days~ 50 MPa

28 days

~ 60 MPa

Material and curing conditions at 23°C / 50% r.h.

Above results based on 50x50mm cube specimens

Flexural-strength

28 days

8.0 MPa

Splitting tensile strength

28 days

6.0 MPa

Tensile adhesion strength

~ 2.0 MPa (submerged concrete)

Application

Application Information

Mixing ratio

3.5 - 3.7 litres of water per 20kg bag

Layer thickness

SikaGrout® UW can be placed in thicknesses of up to 100mm above water, and 200mm underwater.

Application exceeds above thicknesses should be done in stages or have aggregate added to it to reduce the exothermic heat.

When adding aggregate, use SikaGrout Aggregate or smooth rounded aggregate, ranging from 2mm to 10mm.

Maximum aggregate addition is 1:1 by weight to SikaGrout® UW.

Note: Aggregate addition will reduce the flow of the grout and site trials should be carried out before commencement.

Pot Life

20 minutes approx. @20oC

Setting time

Initial - 5 hrs 30 mins @ 20oC
Final - 6 hrs 15 mins @ 20oC
Consumption

Yield

~ 10.8 litres per 20kg bag
Application steps

EQUIPMENT

SikaGrout® UW must be mechanically mixed using a mechanical forced action grout mixer. It is essential that mixing is carried out in a manner so that the grouting operation may continue without interruption.

MIXING

Always add powder to the water. Place approximately 70% of the total water content into the bucket. Add powder slowly to the water while mixing till bag is empty. Then slowly add remaining 30% of the water component is to be added while continuing to mix. The total water required for each 20kg bag of powder is 3.7 litres. Mix the grout until it appears homogenous (3 to 5 minutes). 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 can be poured or pumped through a flexible tube (minimum diameter of 50mm) to the lowest section of the form. The grout flow must be restricted during the pour so that the 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. SikaGrout® UW can be placed in thicknesses of up to 100mm above water, and 200mm underwater. Any grout pour that exceeds this 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 2mm to 10mm. It is recommended that the maximum aggregate addition is 20kg of SikaGrout® UW.

CURING TREATMENT

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 Antisol liquid membranes.

CLEANING OF EQUIPMENT

Cleaning of uncured material with water.  Cured material can only be removed by mechanical means.

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