Spray Applied - SikaRepair®-224

One component, cementitious, structural repair mortar applied by hand trowel or spray methods

SikaRepair®-224 is a one component, cementitious, ready-to-use, silica fume enhanced, fiber reinforced, high strength, shrinkage compensated repair mortar. SikaRepair®-224 is formulated for hand trowel or low-pressure spray application methods. Designed for horizontal (i.e. flat), vertical and overhead installations.

• Ready-to-use, one component material
• Easy to mix, just add clean water
• Can be installed by hand trowel
• Sprayable system
• Superior workability
• Superior abrasion resistance
• Sulfate resistant
• Great adhesion
• Increased resistance to deicing salts
• High early strengths
• Good freeze/thaw resistance
• Silica fume enhanced
• Fiber reinforced

Usage

• On grade, above grade, and below grade concrete
• On horizontal surfaces (e.g. for spall repairs on flat work, or as an overlay)
• On vertical and/or overhead surface repairs when either hand trowel or spray applied
• As a structural repair material for water and wastewater treatment plants, manholes, parking facilities, industrial plants, walkways, bridges, tunnels, dams, abutments, balconies, etc.
• As a filler for voids and cavities
• For the repair of substrates such as concrete, mortars and masonry
• SikaRepair®-224 may only be used by experienced professionals.

Advantages

• Ready-to-use, one component material
• Easy to mix, just add clean water
• Can be installed by hand trowel
• Sprayable system
• Superior workability
• Superior abrasion resistance
• Sulfate resistant
• Great adhesion
• Increased resistance to deicing salts
• High early strengths
• Good freeze/thaw resistance
• Silica fume enhanced
• Fiber reinforced

Packaging

50 lb (22.7 kg) bags; 48 bags per pallet

Color

Powder / Dark Gray

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

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

Product Information

Shelf Life

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

Storage Conditions

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.

Application

Application Information

Mixing Ratio

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

Product Temperature

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

Ambient Air Temperature

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

Substrate Temperature

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

Application Time

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

Waiting / Recoat Times

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

Consumption

Coverage

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.)

Application Steps

MIXING

• 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.

APPLICATION

• 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.
• 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.
• 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.

CURING TREATMENT

• 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.

See More

See Less