SikaGrout®-428 FS CA

12 months in original, unopened packaging.

Store dry at temperatures between +4 and +35 °C (+40 and +95 °F) ensuring that product is not exposed to rain, condensation or high humidity. For best results, condition product between +18 and +24 °C (between +65 and +75 °F)

Consult Sika Canada

Compressive Strength at +23 °C (+73 °F)

Compressive Strength at +10 °C (+50 °F)

Consult Sika Canada

For applications exceeding the prescribed maximum thickness, contact Sika Canada.

Minimum +10 °C (+50 °F)

3.0 - 3.2 L (0.79 - 0.84 US gal.)* per bag of 25 kg (55 lb) (flowable consistency)
* Refer to Mixing instructions for consistency adjustments

Minimum +10 °C (+50 °F)

10 minutes (extendable to 25 minutes - see Mixing Section)

10 minutes (extendable to 25 minutes - see Mixing Section)

12 L (0.43 ft³) approx. flowable grout per bag

Formwork

Where using formwork to contain the grout, it shall be constructed in a workmanlike manner and to the satisfaction of the engineer. It should be sufficiently high to accommodate a head of grout and provisions shall be made at the high points for air to be vented as it is displaced by grout. Forms should be caulked with a Sikaflex® sealant or sealed with SikaBoom® low expansion foam to prevent leakage and lined or coated with a release agent or bond inhibiting material for ease of removal.

    
Note: concrete should be roughened and free from all dirt, oil, grease, and other contaminants either before the formwork is placed into position or where possible after, and anchor bolts to be grouted must be de-greased with suitable solvent. Concrete must be sound and roughened to promote mechanical adhesion. Prior to pouring, the concrete surface should be brought to a SSD (saturated surface-dry) condition before grouting.

Set-Up

Ensure all formwork is properly secured, mixing and placing equipment is functioning and clean-up materials are on hand before proceeding to prepare the grout. Also ensure that sufficient manpower, in the form of trained or experienced personnel are available to avoid interruptions in the grouting process. All temporary works and equipment must be clean in order to prevent contamination of the grout or prevent mixing and placing being delayed. Condition product to room temperature. For warmer temperatures, use cold mixing water and for colder temperatures, use warm mixing water taking into consideration the works to be undertaken, the time required for mixing and that for placing before final setting occurs.

All grease, oil laitance, ice, snow, loose friable material, foreign deposits or any bond inhibiting materials shall be removed from all surfaces with which the grout will come into contact. Concrete shall be roughened with appropriate mechanical means to the extent that it does not present a smooth surface, which would impede the bond of the grout. All dust and loose particles shall be removed by sandblasting, high pressure water-blasting or other suitable means.

Concrete less than 28 days old shall be kept wet for at least 12 hours, and older concrete for a minimum of 24 hours before placing grout. All free-standing water shall be removed from concrete surfaces but the concrete kept to an SSD (saturated surface dry condition) at the time of grouting.

All items to be grouted into place, such as anchor bolts, dowels and pins, shall be degreased with a suitable solvent and properly positioned and anchored prior to grouting. Such items being placed into the fresh grout, where job conditions permit and at the discretion of the engineer in charge, must also be degreased accordingly.

Add 3 L (0.79 US gal.) of water to a mixing vessel (appropriately sized to the volume of grout required) and progressively pour all the content of the bag (proceed over a period of 1 minute). Mix at medium-speed (400 - 600 rpm) with a heavyduty drill fitted with a Mud Mixer type paddle, or in a grout mixer. After all dry product has been added to the water, continue mixing for at least three (3) minutes until an homogenous consistency is achieved. Do not over mix and ensure to minimize air entrapment during the process.

    
Note: If required, 200 mL of additional water may be added to the mix once it has reached an homogeneous consistency

    
The product will start to gel approximately ten (10) minutes after initial mixing. If the product has not been placed within the initial 10 minutes, it may be remixed for 30 seconds to make the product flowable again. This process may be repeated to extend product workability up to a maximum of 25 minutes after completion of the initial mixing.

Within no more than ten (10) minutes after the beginning of mixing, the prepared grout must be pumped or transported (in buckets or wheelbarrows) and placed in the normal manner. This will assist working time and also further avoid the entrapment of air. Grout having been prepared but not placed within ten (10) minutes shall be discarded (where the conditions and consistency of the grout dictate). Grout mixed in mass will result in faster than expected setting times. Plan jobs accordingly so that the grout can be placed right after mixing.

Where necessary and dependent upon consistency being used, ram or ‘chain’ the grout or externally vibrate the formwork to achieve the required flow and compaction. The grout must be confined, leaving the minimum exposed surface so as to contain the material and avoid uncontrolled expansion. After the grout has achieved final set, formwork can be removed and exposed surfaces trimmed or shaped to the desired profile.

As per ACI 308 recommendations for cement concrete, curing is required. To achieve performance consistent with Technical Data, curing must be provided by recognized curing methods, such as wet burlap covered with white polyethylene film. Curing must commence immediately after placing and finishing. Protect freshly applied grout from direct sunlight, wind rain and frost.

Clean all tools and equipment immediately after use with water. Once hardened, material can only be removed manually or mechanically. Wash soiled hands and skin thoroughly in hot soapy water or use Sika® Hand Cleaner towels.