4034 Fast 15 Minute Ultra Low Viscosity Concrete Crack Repair

MIXING AND APPLICATION INSTRUCTIONS

Preparation
Concrete must have a minimum 28 day cure prior to application. The area must be dry. Clean the surface and remove all unsound concrete, dust and debris. Prepare surface using a dry diamond blade or a twisted wire wheel for spalls. Cut perimeter of damage with dry diamond blade to form a key- way. Cracks; open the crack to provide some depth to the crack to allow the product to penetrate deep into the crack.

APPLICATION METHODS

Application in Bulk
Mix 4034 at a 1:1 ratio (A&B). Use a Jiffy Mixer or other multi blade mechanical mixer. No paddle mixers. Mix part A and B mechanically at high speed for approximately 30-40 seconds.

Use mixed product as a primer for the bottom of the repair.

Improper mixing may result in product failure.

For best mixing results and proper blending of parts A and B, recommend a Jiffy Mixer style drill mixer.

Preplacing Method (typically smaller crack repairs)

Prepare the area and add mixed 4034 product to the sides and bottom of the repair area as a primer. Add #30 Grit select sand into the repair. If the repair is deep work in layers adding sand as product is added. As the product saturates the sand, add more sand and product.  Finish with a broadcast of sand slightly above grade and grind as needed for a completely smooth surface with surrounding area.

The preplace sand method can be done purchasing 4034 in both bulk 2 gallon and 10 gallon kits.

Grout Repair (typically larger repair areas)

Prepare the area and add mixed 4034 product to the sides and bottom of the repair area as a primer.  Then add one part of mixed (A&B) product to two parts select sand, i.e., 1 pint of A + 1 pint of B added to 2 quarts of sand. Blend mixed product into sand quickly. Mix product and sand for another 30 seconds and immediately pour into the prepared and primed application area. Work into the repair area quickly. Screed to finished grade and allow to set, top surface with product as needed, broadcast additional sand as needed.

For better finished repair surface, pour grout mix slightly high above the finished grade. Allow product to set and grind using a grinder fitted with a Zec wheel. Work in circular motion to grind/smooth to finished grade. Seal the surface using mixed product neat with no sand.

Injection
Vertical cracks may be repaired using 4034 from duplex cartridges, static mixers and ports for the static mixer to fit into. Set ports over the crack to be injected. Seal over the ports and over the crack using ASTC’s Bond Seal 830 for the vertical cap seal. Allow the Bond Seal 830 to set for about 30 to 40 minutes before injection. Use only ports that fit the static mixers as supplied with the duplex cartridges. Do not change static mixers or ports as the two items are designed to fit together. Place the end of the static mixer into the preplaced port. Slowly and evenly dispense the product using the duplex cartridge gun. Watch the product flow as the mixed product exits the static mixer and flows/travels into the repair area. Monitor the progress of the product as it moves up to the next port above. When the product reaches the next port above the one being injected, remove the static mixer from the port, seal the port with the provided plug and move up to the next port and begin the operation again.

Set time is predicated on the temperature of the substrate. Typically the product will gel in 4 to 5 minutes at about 70 degrees F. The product will harden in 10 to 15 minutes and the ports can be removed. Seal the blemish left by the port using the 830. Sand, sack or finish as needed prior to coating the surface.  Exterior applications should be ground and allowed to set for 1 to 2 days before coating.

Cleanup
Use xylene or equivalent solvent to clean up application tools

Set Time
Three to four minutes, hard for traffic in about fifteen minutes, final cure 24 hours. For more working time in cold conditions pre-condition the product in the freezer or cold area prior to use about 45 minutes.  Cold Conditions Pre-condition the product temperature for use at cold temperatures @ approximately 70F or to slow product set time keep product cool or cold. Call ASTC for additional information.

LIMITATIONS

• Do not use on wet surfaces or expose part A to moisture prior to application  This product is moisture sensitive and should not be applied to wet surfaces
• The 4034 is not intended as a joint filler.  If used as a joint filler, thermal cycles may cause a crack along the sides of the joint.   Likewise, reflective cracking may occur if used as a joint filler and the joint is over coated, showing a crack through the topcoat.
• Product may bond damaged slabs together and may stop movement.  Not intended for use where substrate movement is required
• Product will cure considerably faster in warm or hot conditions and slower in cold conditions.  Do not use a product that is hot.
• 4034 can be top coated with the ASTC 5500 Polyaspartic, however, in areas where the repair and top coat will be exposed to direct sunlight, shadowing or staining of top coat can occur In these areas allow the set product, after it has been ground, to be allowed additional cure time to avoid future staining.
• 4034 can be used outside but due to differences in the repair product density compared to that of the concrete, a small hairline fracture may develop along the bond line of the repair and the concrete. 4034 is an aromatic product and will discolor when exposed to UV but will not be physically changed.

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