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SpecChem Duo Patch

SpecChem Duo Patch

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Two-Component Polymer-Modified Concrete Repair Mortar with Corrosion Inhibitor

Duo Patch is a two-component, polymer-modified concrete repair mortar, enriched with an integral corrosion inhibitor. It’s designed for a variety of applications including horizontal, form and pour, and vertical and overhead when mixed to a stiffer consistency. Duo Patch is particularly effective in industrial settings such as warehouses, parking decks, and roadways, offering superior durability under heavy loads and abrasion.

  • Integrates corrosion inhibitor for added durability.
  • Suitable for repairs ranging from feather edge to 2 inches.
  • Can be used for interior and exterior overlay applications.
  • Provides excellent durability, adhesion, and freeze-thaw resistance.
  • Features an easy-to-trowel high slump consistency.
  • Cures to a natural concrete gray color, blending seamlessly with existing structures.
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Application

Surface Preparation

  • Ensure Cleanliness:Concrete must be clean and free from oil, grease, dust, laitance, or other contaminants. Mechanically abrade to a minimum CSP 3 as per ICRI 310.2.
  • Create Notched Edges:Saw cut a ¼” recess around the patch perimeter to form a thickened edge for added durability in high traffic or load areas.
  • Moisture Condition:Surface must be SSD (saturated surface dry) with no standing water.
  • Steel Reinforcement Cleaning:Clean all exposed reinforcing steel of rust and coat with SpecPrep SB.
  • Priming:Apply SpecPrep SB to SSD concrete with a spray or brush.Apply repair mortar wet on wet or within the open time of the primer (refer to SpecPrep SB datasheet).Alternatively, apply a scrub coat of mixed mortar, placing the patch before it dries.

Mixing and Application

  • Use 7.0 to 7.5 pints of Duo Patch Admix per 50 lb bag, adjusting for desired consistency.
  • Use a low-speed drill to mix. Add powder gradually to liquid and mix for 23 minutes until homogeneous.
  • For repairs ≤1” thick:Apply directly (do not exceed 7 pints admix if over ½” deep).
  • For repairs >1” thick:Extend with up to 60% by weight (30 lbs) of clean, SSD ⅜” aggregate and mix 2 more minutes. Place within 1520 minutes.

Placement Procedure

  • Place with trowel, screed, or pour, ensuring full contact with the substrate.
  • Screed flush with surrounding surface for a smooth, level finish.

Finishing/Curing

  • After initial set, hand trowel to match surrounding concrete texture.
  • Use SpecChem IntraFilm as a finishing aid if needed.
  • Duo Patch is typically self-curing; in harsh environments, apply a water-based curing compound (ASTM C309 compliant).

Packaging

DUO PATCHis available in the following packaging options:

  • Bag and Jug:50 lb bag of DUO PATCH with a 1-gallon jug of DUO PATCH Admix.
  • Pail Unit:60 lb pail containing a 50 lb bag of DUO PATCH and a 1-gallon jug of DUO PATCH Admix.

Shelf Life

Unopened bags of DUO PATCH have a shelf life of 12 months when stored in a dry area. Store in a cool, dry location away from direct sunlight to maximize shelf life. Ensure the DUO PATCH Admix does not freeze.

Test Data

  • Set Time at 70°F (ASTM C266):Initial Set: ~40 minutesFinal Set: ~50 minutes
  • Compressive Strength (ASTM C109):1 Day: 2,500 psi7 Days: 4,000 psi28 Days: 6,000 psi
  • Bond Strength (ASTM C882, Modified):1,800 psi at 7 days
  • Length Change (ASTM C157):Wet Cure @ 28 Days: +0.04%Air Cure @ 28 Days: -0.02%
  • Flexural Strength (ASTM C348):7 Days: 650 psi28 Days: 1,300 psi
  • Yield:~0.42 cubic feet per 50 lb bag