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SpecChem RepCon 928

SpecChem RepCon 928

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Contractor Overview

RepCon 928 is a single-component, polymer-modified, fiber-reinforced rapid-setting repair mortar with corrosion inhibitor. 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.

Best For

  • Concrete floors requiring early return to service
  • Highway pavements and bridge decks
  • Industrial and commercial concrete repair
  • DOT-style repair work requiring ASTM C928/AASHTO T260 performance

Key Features

  • Rapid-setting repair mortar
  • Fiber reinforced with integral corrosion inhibitor
  • Meets ASTM C928 and AASHTO T260 requirements
  • Single-component repair mortar
  • Designed for early resumption of traffic or use

Material & Application Notes

Prepare concrete by removing unsound material and contaminants. Follow SSD substrate practices and place according to repair geometry and exposure conditions.

Why Contractors Choose It

Contractors choose RepCon 928 when downtime matters and the repair needs strength, durability, and specification confidence for traffic-bearing concrete.

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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

  • Setting Time (ASTM C266):Initial set at 40 minutes, final set at 45 minutes (at 70°F).
  • Compressive Strength:3 Hours: 3,200 psi28 Days: 9,625 psi
  • Bond Strength (ASTM C882 Modified):2,245 psi at 7 days.
  • Flexural Strength (ASTM C348):7 Days: 1,250 psi28 Days: 1,350 psi
  • Freeze-Thaw Durability (ASTM C666):Nearly 100% durability after 300 cycles.
  • Chloride Ion Permeability:866 coulombs at 28 days (Low permeability).
  • Modulus of Elasticity:5.5 x 106psi.