King® HC-D1
ENHANCED SHRINKAGE AND CRACKING RESISTANT SHOTCRETE MATERIAL FOR DRY-MIX PROCESS APPLICATIONS
King® HC-D1 is a pre-packaged, pre-blended shotcrete mix, specially designed for dry-process applications, formulated with Portland cement and other carefully selected components. King® HC-D1 is a highly crack-resistant repair material, compatible 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)
Usage
Rehabilitation of concrete bridges, dams, reservoirs, subway, 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
- 30 kg (66 lb) bag
- 1000 kg (2205 lb) bag
*Custom packaging is available to suit specific project requirements
Product Details
Shelf Life
12 months in original, unopened packaging
Storage Conditions
Material should be stored above ground, in a dry, covered area, protected from the elements.
Compressive Strength
| 1 day | 15 MPa (2175 psi) |
| 3 days | 21 MPa (3000 psi) |
| 7 days | 25 MPa (3625 psi) |
| 28 days | 35 MPa (5075 psi) |
Modulus of Elasticity in Compression
| MODULUS OF ELASTICITY | ASTM C469 |
| 7 days | 25.9 GPa (3.8 x 106 psi) |
| 28 days | 30.8 GPa (4.5 x 106 psi) |
Tensile Strength in Flexure
| FLEXURAL STRENGTH | ASTM C78 |
| 7 days | 5.0 MPa (725 psi) |
| 28 days | 7.0 MPa (1015 psi) |
Splitting Tensile Strength
| 7 days | 3.2 MPa (465 psi) |
| 28 days | 3.8 MPa (550 psi) |
Pull-Off Strength
| TENSILE BOND STRENGTH | ASTM C1583 |
| 28 days | 2.0 MPa (290 psi) |
Shear Adhesion Strength
| BOND STRENGTH BY SLANT SHEAR(MODIFIED) | ASTM C882 |
| 7 days | 14.8 MPa (2145 psi) |
| 28 days | 19.2 MPa (2785 psi) |
Shrinkage
| UNIAXIAL DRYING SHRINKAGE* | ASTM C157 |
| 28 days | 220 µm/m |
| 56 days | 290 µm/m |
| 180 days | 360 µm/m |
Restrained Shrinkage / Expansion
| ESTIMATION OF CRACKING POTENTIAL *,** | AASHTO T 334 |
| Age at cracking | No cracks after 100 days |
| Maximum strain | -98.8 µm/m |
| Stress rate | 0.026 MPa (3.77 psi)/day (low cracking potential) |
Coefficient of Thermal Expansion
| 28 days | 11.0 x 10-6/ºC (6.1 x 10-6/ºF) |
Porosity
| AIR CONTENT | ASTM C457 |
6 % ± 2 %
| MAXIMUM AIR VOID SPACING FACTOR | ASTM C457 |
300 μm
| BOILED ABSORPTION | ASTM C642 |
| 28 days | 6.0 % |
| VOLUME OF PERMEABLE VOIDS | ASTM C642 |
| 28 days | 15.0 % |
Freeze thaw resistance
| 28 days | 99 % |
Salt Resistance
| SALT-SCALING RESISTANCE | ASTM C672 |
0.46 kg/m2 (0.09 lb/ft2)
Application
Curing Time
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 1 m2 (9 ft2), 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.
Yield
- Approx. 0.014 m3 (0.5 ft3) / 30 kg (66 lb) bag
- Approx. 0.45 m3 (16.5 ft3) / 1000 kg (2205 lb) bag
SURFACE PREPARATION
REPAIR OR REHABILITATION
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 25 mm (1 in) clearance behind any corroded reinforcing steel. The perimeter of the repair area should be saw-cut a minimum of 20 mm (¾ in). Clean the area to be repaired with potable water, leaving the concrete saturated but free of standing water (SSD).
APPLICATION
Apply King® HC-D1 in accordance with the ACI 506 “Guide to Shotcrete” publication.
CLEAN UP
Remove King® HC-D1 from tools and equipment with water. Cured product can only be removed mechanically.
