RepCon 928

RepCon 928

RepCon 928 is a single-component, polymer-modified, fiber-reinforced, rapid-setting concrete repair mortar with corrosion inhibitor for horizontal and formed vertical use on concrete floors, highway pavements, bridge decks, and other applications requiring early resumption of traffic or use.

  • One-component, dry-polymer modified. Just add water.
  • Fiber-reinforced for early integral strength
  • Air entrained for excellent freeze-thaw durability
  • Takes foot traffic in 1 hour after final set
  • Long work time for hot weather applications (available in fast-set version RepCon® 928 FS)

Coverage

approx 20 sq-ft @ 1/4” (.42 cu-ft per 50 lbs)

Packaging

50 lb bag
3,000 lb SuperSack

Shelf Life

Shelf life of unopened bags stored in a dry facility is 12 months. Excessive temperature differential and/or high humidity can shorten the shelf life expectancy. Store in a cool, dry area away from direct sunlight.

Standards

ASTM C 928 R3 (Rapid-hardening Mortar)
AASHTO T-260

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.

Modulus of Elasticity Test Data based on 5.0 pints water
Set Time at 70°F
ASTM C266
Initial Set 40 min
Final Set 45 min
Compressive Strength
ASTM C109
3 hour 3250 psi
1 day 5215 psi
7 days 7350 psi
28 days 9025 psi
Bond Strength
ASTM C882 modified
7 days 2245 psi
Flexural Strength
ASTM C348
7 days 1250 psi
28 days 1350 psi
Freeze-Thaw Resistance
ASTM C666
Procedure A (300 cycles) 99% Durability Factor
Rapid Chloride Permeability
ASTM C1202
28 days 866 coulombs
Length Change
ASTM C157
Air Cured -0.05%
Water Cured +0.03%
Modulus of Elasticity
ASTM C469		 5.5 × 106 psi
Data Sheets

Download Technical Data Sheet

Download Safety Data Sheet

Download Specifications Guide

Download Technical Data Sheet (Spanish)

Play

Coverage

approx 20 sq-ft @ 1/4” (.42 cu-ft per 50 lbs)

Packaging

50 lb bag
3,000 lb SuperSack

Shelf Life

Shelf life of unopened bags stored in a dry facility is 12 months. Excessive temperature differential and/or high humidity can shorten the shelf life expectancy. Store in a cool, dry area away from direct sunlight.

Standards

ASTM C 928 R3 (Rapid-hardening Mortar)
AASHTO T-260

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.

Modulus of Elasticity Test Data based on 5.0 pints water
Set Time at 70°F
ASTM C266
Initial Set 40 min
Final Set 45 min
Compressive Strength
ASTM C109
3 hour 3250 psi
1 day 5215 psi
7 days 7350 psi
28 days 9025 psi
Bond Strength
ASTM C882 modified
7 days 2245 psi
Flexural Strength
ASTM C348
7 days 1250 psi
28 days 1350 psi
Freeze-Thaw Resistance
ASTM C666
Procedure A (300 cycles) 99% Durability Factor
Rapid Chloride Permeability
ASTM C1202
28 days 866 coulombs
Length Change
ASTM C157
Air Cured -0.05%
Water Cured +0.03%
Modulus of Elasticity
ASTM C469		 5.5 × 106 psi
Data Sheets

Download Technical Data Sheet

Download Safety Data Sheet

Download Specifications Guide

Download Technical Data Sheet (Spanish)

Play