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SpecChem SpecShot

SpecChem SpecShot

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High-Performance Shotcrete Repair Mortar

SpecShot is a single-component, high-performance shotcrete mortar formulated for demanding vertical and overhead concrete repair projects. It provides exceptional durability, low rebound, and low shrinkage, ensuring long-lasting repairs in industrial, commercial, and infrastructure settings, including Department of Transportation (D.O.T.) applications.

Designed for application via dry shotcrete (gunite) or wet mix methods, SpecShot delivers a strong bond to existing concrete, making it a reliable solution for restoring deteriorated structures. Its built-in corrosion inhibitor enhances durability, while its concrete-gray color ensures a seamless finish.

  • One-component formulation just add water
  • Low permeability enhances durability and resistance to moisture intrusion
  • Low rebound minimizes material waste during application
  • Low shrinkage reduces cracking and enhances longevity
  • Integral corrosion inhibitor protects against reinforcement corrosion
  • Designed for vertical and overhead repairs ideal for structural restoration
  • Concrete-gray color blends with existing concrete for a natural appearance
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Application

Surface Preparation

  • Ensure the concrete substrate is sound, clean, and free from oil, grease, dust, laitance, or other contaminants.
  • Best practice: Saw-cut the perimeter of the repair area and use abrasive blasting to achieve a uniform depth and high surface profile for optimal adhesion.
  • The surface should be saturated-surface-dry (SSD) with no standing water before application.

Mixing

  • Add potable water at a maximum rate of 10% (7.6 pints per 80 lb. bag).
  • Mix thoroughly using standard dry process shotcrete methods.

Placement

  • Apply in accordance with ACI 506-R05 “Guide to Shotcrete” for best results.
  • Recommended application depth: ½ inch to 6 inches per pass.
  • For repairs exceeding 6 inches, apply in multiple layers, cross-hatching the initial layer and allowing it to harden before applying additional layers.

Finishing & Curing

  • Finish the repair material to match the surrounding concrete texture.
  • Self-curing under most conditions; however, in extreme drying conditions, use an ASTM C309-compliant water-based curing compound.

Packaging

  • 80 lb. bags yields approximately 0.62 cubic feet per bag
  • 3,000 lb. bulk bags available upon request

Cured Unit Weight:135 lbs. per cubic foot

Shelf Life

  • Shelf life: 12 months in unopened bags, stored in a dry facility.
  • Avoid exposure to excessive temperature fluctuations and high humidity, which may shorten shelf life.
  • Store in a cool, dry area, away from direct sunlight.

Uses

  • Bridge and tunnel repairs
  • Parking structure restoration
  • Industrial facility maintenance
  • D.O.T. infrastructure rehabilitation
  • Concrete wall and column repairs

Standards

  • Setting Time (ASTM C-266)Initial Set: ~3 hoursFinal Set: ~5 hours
  • Compressive Strength (ASTM C-109)3 days: 2,000 psi7 days: 3,500 psi28 days: 5,500 psi
  • Bond Strength (ASTM C-882)7 days: 1,600 psi
  • Flexural Strength (ASTM C-348)7 days: 500 psi28 days: 700 psi
  • Scaling Resistance (ASTM C-672, 50 cycles)Result: No scaling

Cleaning

Tools and equipment can be cleaned with water before SpecShot hardens.