Where to use:Fast repairs to vertical, overhead, and horizontal concrete above or below grade.
How to apply:Trowel and Sponge Float. Additional Information
Performance CharacteristicsFast setting
- Formulated to set quickly to increase productivity.
- Superior hang for overhead vertical applications.
- Maintains integrity of repair, resists cracking.
- Prevents delamination due to temperature change.
- Resistant to weathering action, excellent freeze/thaw stability and abrasion resistance.
- Resistant to deicing salts, carbonation, chloride, and chemical attack.
- Easy to batch in less than full bag quantities.
- Remove loose and deteriorated material, laitance, dirt, dust, oil and any surface contaminants that will inhibit proper bond.
- Saw cut edges with a diamond blade at a 90° angle to eliminate feather edging. Avoid polishing the edges as this will inhibit bond.
- Avoid bruising or micro cracking during surface preparation. Refer to ICRI Surface Preparation Guide 03732.
- Repair zone must be a minimum of 1/2 inch deep, of simple geometry, with no complex edge conditions.
- Avoid long narrow repairs; these have a tendency to crack.
- Saturate substrate with clean water, (saturated surface dry/SSD), with no standing water during Priming or Application.
- Remove concrete from corroded steel and several inches beyond to expose non-corroded steel.
- Provide a 3/4 inch clearance between the concrete and steel.
- Damaged reinforcing steel should be inspected by a qualified engineer and appropriate action taken.
- Prime the prepared substrate including all edges with a slurry coat of the repair mortar. Work the slurry into the substrate to ensure intimate contact and establish bond. The repair material must be applied while slurry is wet. If the slurry dries, remove and recoat.
- Alternatively, use Conpro Primer or ECB as a bonding primer. Refer to the individual product technical data bulletin for information.
- Remove all scaling rust from reinforcing steel. Apply ECB anti-corrosion coating.
- Mix only as much material as can be placed in 10-15 minutes.
- Mechanically mix using a low speed drill (400-600 rpm) and mixing paddle or mortar mixer.
- Pour slightly less than 1 gallon of potable water into a clean mixing vessel and slowly add all 50 lbs. of material.
- Substitute 1 quart of K-88 Admix for water for a polymer modified repair mortar.
- Mix continuously for 3 minutes to a uniform, lump-free consistency.
- Add up to 1 cup of additional water if needed.
- Do not overmix, as this will entrain excess air.
- For smaller batches, proper mix ratio is 4 ¼ parts powder per 1 part water.
- At the time of application, surfaces should be saturated surface dry (SSD) but hold no standing water.
- Follow instructions for Priming.
- Force the material against the edges of the repair, working toward the center.
- Material may be applied in multiple lifts of not less than 3/8 inch and up to 4 inches.
- Consolidate each lift and allow to stiffen to thumb-print hard before continuing.
- Scratch (cross-hatch) each lift to prepare surface for subsequent lift.
- Finish with a sponge float or trowel.
- Do not overwork the finish.
- For horizontal or supported applications over 2 inches, a maximum of 30 lbs of 3/8 inch aggregate per 50 lb bag may be added to reduce shrinkage and improve yield. Aggregate must be non-reactive, low absorption, graded and high density.
- Dampen the repair with a fine mist of water for 24 hours or moist cure with wet burlap and polyethylene.
- Protect repair from direct sunlight, wind, rain and frost during curing period.
- Clean tools and equipment with water immediately after use.
- Cured material must be removed mechanically.
- 0.44 ft³/50 lbs.
- 0.67 ft³ when extended with 30 lbs. of 3/8 inch aggregate.
- 50 lbs. multi-wall, poly lined bags.
- Bag – 12 months when properly stored.
- Transport and store in cool, clean, dry conditions in unopened containers.
- High temperature or high humidity will reduce shelf life.
- Do not apply unless substrate and ambient temperature can be maintained at a minimum of 40°F for 24 hours. Refer to ACI Cold Weather Application Guidelines.
- Cold mixing water and low temperature will retard set. Hot water and high temperature will accelerate set.
- Protect application from precipitation and high wind for at least 8 hours.
- Do not add more water than specified, this will lower strengths and cause shrinkage cracking.
- Avoid overworking material during placement and finishing – this will produce surface (map) cracking.
- Surface whitening can occur when polyethylene is in contact with the material during the first 24 hours of curing.
Health and Safety
- Product is alkaline.
- Do not ingest.
- Avoid breathing dust.
- Avoid contact with skin and eyes.
- Refer to Safety Data Sheet (SDS) for additional information.
- In case of skin contact, wash thoroughly with soap and water.
- For eye contact, flush immediately with a high volume of water for at least 15 minutes and contact a medical professional.
- For respiratory problems, remove person to fresh air.
- Dispose of material in accordance with local, state and federal regulations.