Apply with ambient and surface temperatures ranging between –20°F (-29°C) to 130°F (54°C). Colder temperatures will slow cure. At 75°F (24°C) ready for traffic in 10 – 15 minutes.
EVALUATE / SET EXPECTATION
Establish if crack to be treated is structural or static.
- Structural Cracks
- Likely larger than 1/8” in width
- May be “spitting” aggregate
- Travel full length of slab
- Travel from control joint to control joint
- Backer rod or sand may be used to partially fill large deep cracks. Finished depth of epoxy must be at least 1” (2.5 cm).
- Treatment will minimize return of crack in overlay
- Static Cracks
- Less than 1/8” in width
- Do not travel full length of slab
- Do not travel from control joint to control joint
- Treatment likely to be successful
Large spalls or voids in slab, especially those that are full depth of concrete will likely have a structural crack at perimeter. Damp or wet cracks cannot be treated.
Clean area of debris and contaminants that would act to break the bond of SCT-22 to concrete (i.e. oil, loose materials, rubber, dirt, etc.) Do not apply to wet surfaces.
- With 4” hand-held electric grinder equipped with a flat diamond “turbo” blade grind the full length of the existing crack to a minimum depth of ¾” (10 cm).
- Be certain to engage the blade to the full depth of diamonds.
- Remove dust from the crack with brush and forced air (leaf blower or air compressor) or vacuum.
Following crack chasing, prior to application of any product, fill the dressed crack with clean, dry sand (grit size: 12-60) flush with the surface.
- Shake the cartridge thoroughly for at least 30 seconds.
- Remove cap and install flow restrictor on top of ports.
- Screw static auger tip in place.
- Insert assembled dual cartridge into “gun”.
- With tip pointed up, gently squeeze the gun’s trigger to bleed off air in the dual cartridge and have material flow into tip.
- Point the tip down over waste receptor and squeeze out a small amount of material to observe proper mixing in auger tip, observe uniformity of color (goes darker). [Note: do not tilt gun back up so that catalyzed material can flow from auger tip back into dual cartridge. This will cook the cartridge].
- Dispense product with constant even pressure and completely saturate the sand and fill completely with SCT-22
- Saturated sand may be manipulated into place with a margin trowel or putty knife as required.
- Additional sand may be “seeded” into product before curing to increase bonding capacity of subsequent overlay
- Allow product to set (approximately 15 mins.) Scrape with a sharp blade the excess material for disposal. Or alternatively use a handheld grinder equipped with an abrasive wheel designed to grind concrete to clear excess material flush with slab.
Following the treatment of the crack, just prior to the installation of an overlay (if used), a scratch coat must be installed over the treated crack.
- Allow SCT-22 to set and no longer be tacky (approximately 15 mins.)
- Dampen the slab area adjacent to both sides of the treated crack.
- Trowel a tight coat of SureBroom (see TDS) across the full length of the crack.
- Total width of the scratch coat should be approximately 12” (30 cm).
- Carefully feather the edge of the troweled material with trowel or damp sponge to leave no ridges.
SPALLS / LARGE REPAIRS
All of the above referenced directions apply by principle.
Clean area of debris and contaminants that would act to break the bond of SCT-22 to concrete (i.e. oil, loose materials, rubber, dirt, etc.) Expose clean rough concrete for best results in spall restoration. Do not apply to wet surfaces.
Although not required, damaged areas may be saw cut to create a neater patch. Utilize a diamond blade to cut perimeter of patch to a minimum depth of ¾” (10 cm).
Following saw-cutting, prior to application of any product, fill the dressed area with clean, dry sand (grit size: 12—60) flush with the surface. Spalls deeper than 2” (5 cm) may utilize pea gravel combined with sand.
Remains the same, see above description.
- Dispense product with constant even pressure and completely saturate the sand/pea gravel and fill completely with SCT-22
- Multiple lifts of sand/pea gravel and SCT-22 may be required for extremely large spalls
- Allow product to set (approximately 15 mins.) Scrape with a sharp blade the excess material for disposal. Or alternatively use a handheld grinder equipped with a “Zek” blade to clear excess material flush with slab