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King® HC-D1

ENHANCED SHRINKAGE CRACKING RESISTANCE SHOTCRETE MATERIAL FOR DRY-MIX PROCESS APPLICATIONS

King® HC-D1 is a pre-packaged and pre-blended shotcrete material formulated for dry-mix applications, equiped with crack-resistant technology. It contains Portland cement along with other carefully selected components. It offers enhanced shooting characterisitics and physical properties, highly crack-resistant repair material, along with compatibility with existing concrete substrates that allows for durable repairs.

  • Low cracking potential (according to AASHTO T334)
  • Very low shrinkage
  • Physical properties similar to conventional concrete, thus offering excellent compatibility with existing concrete
  • Air-entrainment providing superior resistance to freeze-thaw cycling and salt-scaling resistance
  • Improved adhesive and cohesive plastic properties
  • Significantly reduced rebound, resulting in lower material usage
  • Very low permeability
  • Designed with natural, normal-density, non-reactive, fine and coarse aggregates to eliminate potential alkali-aggregate reactivity (AAR)
King® HC-D1
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Usage

Rehabilitation of concrete bridges, dams, reservoirs, tunnels, marine structures, parking ramps, and other concrete structures  

Advantages

  • Low cracking potential (according to AASHTO T334)
  • Very low shrinkage
  • Physical properties similar to conventional concrete, thus offering excellent compatibility with existing concrete
  • Air-entrainment providing superior resistance to freeze-thaw cycling and salt-scaling resistance
  • Improved adhesive and cohesive plastic properties
  • Significantly reduced rebound, resulting in lower material usage
  • Very low permeability
  • Designed with natural, normal-density, non-reactive, fine and coarse aggregates to eliminate potential alkali-aggregate reactivity (AAR)

Packaging

66 lb (30 kg) bag

2205 lb (1000 kg) FIBC*

Custom packaging is available to suit specific project requirements

*Flexible Intermediate Bulk Container

Product Details

Product Information

Shelf Life

12 months in original, unopened packaging

Storage Conditions

Stored in a dry, covered area, protected from the elements between

40°F - 95°F (5°C - 35°C)

 
Technical Information

Compressive Strength

ASTM C1604

1 day

2175 psi (15 MPa)

3 days

3000 psi (21 MPa)

7 days

3625 psi (25 MPa)

28 days5075 psi (35 MPa)

Modulus of Elasticity in Compression

MODULUS OF ELASTICITY

ASTM C469

7 days

3.8 x 106 psi (25.9 GPa)

28 days

4.5 x 106 psi (30.8 GPa)

Flexural Strength

FLEXURAL STRENGTH

ASTM C78

7 days

725 psi (5.0 MPa)

28 days

1015 psi (7.0 MPa)

Splitting tensile strength

SPLITTING TENSILE STRENGTH

ASTM C496

7 days

465 psi (3.2 MPa)

28 days

550 psi (3.8 MPa)

Tensile Adhesion Strength

TENSILE BOND STRENGTH

ASTM C1583

28 days

290 psi (2.0 MPa)

Slant Shear Strength

BOND STRENGTH BY SLANT SHEAR(MODIFIED)

ASTM C882

7 days

2145 psi (14.8 MPa)

28 days

2785 psi (19.2 MPa)

Shrinkage

UNIAXIAL DRYING SHRINKAGE*

ASTM C157

28 days

0.022%

56 days

0.029%

180 days

0.036%

Restrained Shrinkage / Expansion

ESTIMATION OF CRACKING POTENTIAL  *, **

AASHTO T 334

Age at cracking

No cracks after 100 days

Maximum strain

-0.0098.8%

Stress rate

3.77 psi (0.026 MPa) per day

(low cracking potential)

Coefficient of Thermal Expansion

CRD-C39

28 days

6.1 x 106/°F (11.0 x 106/°C)

Porosity

AIR CONTENT

ASTM C457

6 % ± 2 %

MAXIMUM AIR VOIDS SPACING FACTOR

ASTM C457

0.0118 in

BOILED ABSORPTION

ASTM C642

28 days

6.0 %

MAXIMUM VOLUME OF PERMEABLE VOIDS

ASTM C642

28 days

15.0 %

Freeze-Thaw Stability

ASTM C666

28 days

99 %

Salt resistance

SALT-SCALING RESISTANCE

ASTM C672

0.09 lb/ft2 (0.46 kg/m2)

Application

Consumption

Coverage

Approx. 0.5 ft3 per 66 lb bag (0.014 m3 per 30 kg bag)

Approx. 16.5 ft3 per 2205 lb FIBC (0.45 m3 per 1000 kg FIBC)
Application steps

EQUIPMENT

Special precautions needed when using predampeners with dry blended powdered accelerated shotcrete.

  

Contact your Sika STM Technical Representative for more information.

 

SURFACE PREPARATION

  • Repair or Rehibilation: All surfaces to be in contact with King® HC-D1 must be free from dust, oil, grease or any other foreign substances that may interfere with the bond of the material. Remove all loose or delaminated concrete providing a roughened surface and a minimum of 1 inch (25 mm) clearance behind any corroded reinforcing steel. The perimeter of the repair area should be saw-cut a minimum of ¾ inch (20 mm). Clean the area to be repaired with potable water, leaving the concrete saturated but free of standing water (SSD).
  • Rock surfaces: All surfaces to be in contact with product must be free from dust, oil, grease or any other foreign substances that may interfere with the bond of the material. Remove all loose or delaminated rock. Clean the area with potable water, leaving the substrate saturated but free of standing water (SSD).

APPLICATION

Apply King® HC-D1 in accordance with the ACI 506 “Guide to Shotcrete” publication.

  

Performance of in-place shotcrete relies heavily upon application techniques. The shotcrete material, equipment and key personnel should be pre-qualified prior to project start-up to ensure optimum quality of in-place shotcrete.

  

OPTIMUM PERFORMANCE

  

  • King® HC-D1 should not be applied when ambient substrate and material temperatures are below 40 °F (5 °C) or above 95 °F (35 °C).
  • For adverse temperatures, follow ACI recommendations for Cold / Hot Weather Concreting.

  

Contact your Sika STM Technical Representative for more information.

 

CURING TREATMENT

Curing is essential to optimize physical properties of the shotcrete and minimize shrinkage. King® HC-D1 should be cured immediately after
material has reached initial set in accordance with ACI 308 “Guide to Curing Concrete”. For optimum results, begin by continuously moist curing for a minimum period of three (3) days. Following the 3 day moist curing period, apply two (2) coats of a curing compond (ASTM C309 compliant). When the area of the repair area does not exceed 9 ft2 (1 m2), it is possible to directly apply two (2) coats of curing compound (ASTM C309 compliant). Curing is particularly critical in rapid moisture loss conditions such as high temperatures, high winds and low humidity.

CLEANING OF TOOLS

Remove King® HC-D1 from tools and equipment with water. Cured product can only be removed mechanically.

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