SpecChem > Products > Repair Mortars > RepCon 928

RepCon 928 Green Conscious Product

Polymer-modified rapid-setting concrete repair mortar with corrosion inhibitor

RepCon 928 is a single-component, polymer-modified, fiber-reinforced, rapid-setting concrete repair mortar, formulated with a corrosion inhibitor. It’s specifically designed for use on concrete floors, highway pavements, bridge decks, and other scenarios requiring a quick return to service. Adhering to ASTM C928 and AASHTO T260 standards, RepCon 928 leverages advanced polymer technology for unparalleled durability and ease of application in horizontal and vertical form & pour applications without the need for liquid activators.

  • One-component system, simply add water to mix.
  • Incorporates dry polymer technology, offering exceptional freeze-thaw durability.
  • Suitable for both hand-applied and spray-applied techniques, ideal for large-scale projects.
  • Easy to apply with an optimal finishing consistency for up to 2-inch applications.
  • Naturally cures to a concrete-gray color.
  • Can be used for horizontal and vertical applications, accommodating foot traffic within 1 hour of final set.
  • Offers a long working time, especially beneficial for hot weather applications (fast-set version available as RepCon 928 FS).
Tech Sheet
Safety Sheet
Sell Sheet
Spanish Tech Sheet

Application

Surface Preparation

  • Clean the Surface: Ensure the concrete is sound, free from oil, grease, dust, laitance, or contaminants. Saw cut the perimeter of the repair area 1/8” deeper than the repair depth for a notched edge, enhancing durability.
  • Abrade the Surface: Mechanically abrade to a minimum Concrete Surface Profile (CSP) of 5, following ICRI 310.2 guidelines, ensuring a saturated-surface-damp (SSD) condition without standing water.
  • Steel Reinforcement: Clean exposed steel of rust and apply SpecPrep SB. Apply a spray or brush coat of SpecPrep SB to SSD concrete and proceed with the repair mortar application wet on wet or within the open time specified in the SpecPrep SB datasheet.

Mixing and Application

  • Mixing Instructions: Use 4.75 to 5.0 pints (up to 5.25 pints for non-DOT, more flowable applications) of clean water per 50-pound bag. Mix with a low-speed drill or mortar mixer, adding water to the container first, then gradually the RepCon® 928 powder. Mix for 2-3 minutes until homogenous.
  • Application Depth: Apply from 1” to 2” without aggregate extension. For deeper repairs in heavy traffic areas, extend with clean, SSD 3/8” aggregate up to 60% by weight for over 1” repairs or up to 100% for over 4” repairs, mixing for an additional 2 minutes. Pre-dampen the aggregate and adjust the mixing water accordingly.

Placement

Firmly trowel or screed RepCon® 928 into the area, ensuring full contact with the surface. Allow initial set before finishing with a hand trowel. Excessive troweling isn’t required.

Finishing and Curing

Match the texture with surrounding concrete without adding water during finishing. Use SpecFilm as a finishing aid if needed. In DOT applications or severe conditions, use an ASTM C309 compliant SpecChem curing compound.

Packaging

Available in 50 lb bags or 3,000 lb SuperSacks, offering approximately 20 sq-ft coverage at 1/4 inch per 50 lbs.

Test Data

  • Initial setting time of 40 minutes, with a final set at 45 minutes at 70°F, as per ASTM C266.
  • Achieves a compressive strength of 3200 psi in 3 hours, progressing to 9625 psi over 28 days.
  • Bond strength of 2245 psi after 7 days, in accordance with a modified ASTM C882.
  • Flexural strength measured at 1250 psi within 7 days, increasing to 1350 psi by 28 days.
  • Demonstrates nearly 100% durability after 300 freeze-thaw cycles according to ASTM C666.
  • Exhibits low chloride ion permeability at 866 coulombs within 28 days.
  • Modulus of elasticity stands at 5.5 x 10^6 psi, indicating significant resistance against deformation.

Documents

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RepCon 928 - Spec Component