SikaRepair®-224

NSF/ANSI 61 compliant for potable water contact after cure (reference: UL FDNP.MH17464).

12 months from date of production if stored properly in original, unopened and undamaged, sealed packaging

Store in cool, dry, well ventilated conditions, out of direct sunlight at 40 - 95 °F (4 - 35 °C). Protect powder from moisture. If permitted to become damp, discard material.

* Mortar scrubbed into mechanically prepared, saturated surface dry (SSD) substrate.

6 to 7 pints (2.8 - 3.3 liters) of liquid (e.g. clean water or SikaLatex® R admixture) per 50 lb. (22.7 kg) bag of SikaRepair®-224

* If repair requires multiple lifts, each lift should be applied as soon as the previous lift develops enough initial strength to support it.

Condition 65 - 75 °F (18 - 24 °C) before use.

40 °F (4 °C) minimum / 95 °F (35° C) maximum

40 °F (4 °C) minimum / 95 °F (35° C) maximum

Approximately 30 minutes

Temperature will affect the Application Time:

Above 73 °F (23 °C) will reduce the Application Time and slump

Below 73 °F (23 °C) will extend the Application Time and slump

Refer to Sika Tech Brief # 18-01 for minimum cure times prior to overcoating.

0.40 ft³ (0.01 m³) per Neat mix

0.58 ft³ (0.02 m³) per Extended mix, containing 25 lbs (11.4 kg) of 3/8 inch (10 mm) coarse aggregate

(Yield figures do not include allowance for surface profile and porosity, or material waste.)

• With water: Pour 6 pints (2.8 liters) of clean water into a suitably sized mixing container.
• Add the entire bag's contents of SikaRepair®-224 to the container while continuously mixing with a low-speed rotary drill (400 - 600 rpm) and paddle or a concrete mixer.
• Add up to an additional maximum 1 pint (0.5 liter) of water, if needed, for the desired consistency.
• Do not overwater. Excess water may cause segregation.
• Mix to a uniform consistency, maximum 3 minutes. Thorough mixing and proper proportioning are necessary.
• With SikaLatex® R: Pour 6 pints (2.8 liters) of SikaLatex® R admixture into the mixing container. Slowly add SikaRepair®-224, mix and adjust as above.     
• With diluted SikaLatex® R: SikaLatex® R admixture may be diluted up to 5:1 (i.e. clean water : SikaLatex® R) by volume for projects requiring minimal polymer modification. Pour 6 pints (2.8 liters) of the mixture into the mixing container. Slowly add SikaRepair®-224, mix and adjust as above.

EXTENSION WITH AGGREGATES   

• For horizontal applications greater than 1" (25 mm) in depth, extend with 3/8" (10 mm) coarse aggregate. If placement is vertical or overhead, support the material with forms as required.
• Pour 6 pints (2.8 liters) of clean water, SikaLatex® R admixture or diluted SikaLatex® R mixture into a suitably sized mixing container or a concrete mixer.
• Add entire bag's contents of SikaRepair®-224 while mixing continuously, then introduce 3/8" (10 mm) coarse aggregate.
• Mix to uniform consistency, maximum 3 minutes. Thorough mixing and proper proportioning of all components is necessary.
• Add up to an additional maximum 1 pint (0.5 liter) of liquid, if needed, for the desired consistency. Do not exceed 7 pints (3.3 liters) of liquid.
• Ideally, the aggregate must be nonreactive (reference: ASTM C1260, ASTM C227 and ASTM C289), clean, well graded, saturated surface dry (SSD), have low absorption, high density, and comply with ASTM C33, size number 8 per Table 2.
• Variances in aggregate quality may result in different strengths and cured performance.
• The typical addition rate is 25 lbs (11.4 kg) of aggregate per mix. This is approximately 2 gallons (7.6 liters) of aggregate by loose volume.

• Apply SikaRepair®-224 mortar by hand trowel or spray methods for the repair of horizontal, vertical or overhead concrete surfaces.
• At the time of application, the substrate surfaces must be saturated surface dry (SSD) but hold no standing water.

Hand Trowel

• A neat mix of SikaRepair®-224 mortar must initially be scrubbed into the mechanically prepared, SSD substrate. Alternately an appropriate Sika bonding agent product can be used. Be sure to fill all pores and voids.
• Apply SikaRepair®-224 mortar by hand trowel while the scrub coat or bonding agent is still wet and uncured.
• Force material against edges of repair, working toward center. After filling repair area, screed off excess SikaRepair®-224 mortar.
• Allow SikaRepair®-224 to set to the desired stiffness. Finish with broom or with a burlap drag for a rough finish.  Finish with a wood float for a granular finish. Finish with a steel trowel or a magnesium float for a smooth finish.
• To assist in the finishing process, use SikaFilm® finishing aid. Please consult the current product data sheet for additional information.
• Mixing, placing and finishing typically should not exceed 2 to 3 hours maximum.

Wet Process Spraying

• Conventional wet process shotcrete spray equipment should be used. Consult directly with the equipment manufacturer for their recommendations.
• Set up wet process spray equipment. Add liquid [i.e. 6 - 7 pints (2.8 - 3.3 liters) per bag] directly into the mixer.
• Start the mixer in motion and add SikaRepair®-224 powder while continuing to mix.
• When spraying, shoot perpendicular (i.e. at a 90° angle) to vertical or overhead surfaces. This minimizes rebound, creates the smoothest pattern (i.e. reduces "bumps") and properly encases rebar.  Consult ACI 506R, the "Guide to Shotcrete" for additional information.
• The velocity of the material is sufficient, if at a distance of 18 to 24 inches (46 to 61 cm), the material pattern flattens out on contact with the surface and rebars are encased.
• After applying the material, allow it to stiffen before removing bumpy areas with a trowel.
• Before applying the next layer, allow the material to develop initial strengths. This may take anywhere from 2 - 4 hours, depending on mix consistency, ambient and substrate temperatures, wind conditions and humidity.
• Begin and finish multiple lift repairs on the same day. To assist in the finishing process of the final lift, use SikaFilm® finishing aid. Please consult the current product data sheet for additional information.
• Refer to ACI 305R the "Guide to Hot Weather Concreting" or ACI 306R the "Guide to Cold Weather Concreting" when there is a need to place this product while either hot or cold temperatures prevail. Thinner placements will be more sensitive to actual temperature conditions.

Natural Gun Finish

• If a gun-finish is too rough, special finishes may be applied.
• After sufficient stiffening and initial strength gain, excess material should be sliced off with a sharp-edged cutting screed. The surface may then be finished to the actual application's requirements:
  • Broom for a rough texture
  • Wood float for a granular texture
  • Steel trowel for a smooth finish
• To assist in the finishing process, use SikaFilm® finishing aid. Please consult the current Product Data Sheet for additional information.

• As per ACI recommendations for Portland-cement concrete, curing is required.
• Moist curing should commence immediately after finishing.
• Moist cure with wet burlap and/or polyethylene, a fine mist of water or a water-based,* compatible curing compound meeting ASTM C309.
• Curing compounds may adversely affect the adhesion of following layers of mortar, leveling mortars or protective coatings.
• Protect newly applied material from direct sunlight, wind, rain and frost.
• To prevent from freezing, cover with insulating material (e.g. curing blanket).

        * Pretesting of curing compound for compatibility is recommended.