King® MS-W1
SHOTCRETE MATERIAL FOR WET-MIX PROCESS APPLICATIONS
King® MS-W1 is a pre-blended, prepackaged, wet-process shotcrete material containing Portland cement, silica fume, blended aggregates and other carefully selected components. It has greatly enhanced shooting characteristics and physical properties.
- Air-entrainment provides superior resistance to freeze-thaw cycling and salt-scaling resistance
- Improved pumpability and shootability
- Improved adhesive and cohesive plastic properties
Usage
- Rehabilitation of concrete bridges, dams, reservoirs, subway tunnels and parking ramps
- Lining and rehabilitation of sewers and watermains
- New construction including slope stabilization, soil-nailing, shaft and tunnel linings, pools and other concrete structures
Advantages
- Air-entrainment provides superior resistance to freeze-thaw cycling and salt-scaling resistance
- Improved pumpability and shootability
- Improved adhesive and cohesive plastic properties
- Significantly reduced rebound, resulting in lower material usage
- Improved ability to build greater thicknesses in a single pass in both vertical and overhead orientations
- Improved resistance to water wash-out
- Improved resistance to sulphate attack
- Very low permeability
- Low dust levels
- Low shrinkage
- Compatible with integral, pre-applied and/or post-applied corrosion inhibitors*
- Designed with natural normal-density non-reactive aggregates to eliminate potential alkali-aggregate reactivity (AAR)
SET-TIME/STRENGTH GAIN
Liquid accelerator can be added at the nozzle to reduce set time and increase early age strength gain. Contact your Sika Technical Representative for more information.
MICRO-SYNTHETIC FIBRE (SY)
- Synthetic fibres reduce cracking caused by intrinsic stresses
- Type III synthetic fibre in accordance with ASTM C 1116
- Grade FR Class I shotcrete in accordance with ASTM C 1480
• Corrosion inhibitor protects steel reinforcing and other metals embedded in concrete from corrosion induced by carbonation or chlorides
• Pre-blended corrosion inhibitor provides the correct dosage to enhance corrosion protection *For more information regarding the use of a corrosion inhibitor in conjunction with King® MS-W1, please contact your Sika Technical Representative.
EXAMPLE:
For King® MS-W1 with synthetic fibres and Gradation No. 2, the name of the product would be King® MS-W1 SY G2.
Packaging
- 30 kg (66 lb) triple-lined bags
- 1000 kg (2 205 lb) FIBC
- Products containing macro-synthetic fibres (MF) or steel fibres (ST) can only be packaged in bulk bags (FIBC).
*Custom packaging is available to suit specific project requirements
Product Details
APPROVALS / CERTIFICATES
GRADATION
• By default King® MS-W1 is blended to meet ACI 506 “Guide to Shotcrete”, Table 1.1, Gradation No. 1
• King® MS-W1 G2 is blended to meet ACI 506 “Guide to Shotcrete”, Table 1.1, Gradation No. 2.
Shelf Life
12 months in original, unopened packaging
Storage Conditions
Material should be stored in a dry, covered area, protected from the elements.
Compressive Strength
| ASTM C 1604 |
| 1 day | 15 MPa (2175 psi) |
| 3 days | 28 MPa (4060 psi) |
| 7 days | 32 MPa (4640 psi) |
| 28 days | 42 MPa (6000 psi) |
Tensile Strength in Flexure
| ASTM C 78 |
Splitting Tensile Strength
| 7 Days | 4.5 MPa (650 psi) |
| 28 Days | 5.8 MPa (840 psi) |
**Data was obtained under laboratory conditions using specimens cast in accordance with the indicated test method.
Shrinkage
UNIAXIAL DRYING SHRINKAGE
| 650 µm/m | ASTM C 157 |
Porosity
AIR CONTENT
| 6% ± 2% | ASTM C 457 |
BOILED ABSORPTION
| 6.0% | ASTM C 642 |
MAXIMUM AIR VOID SPACING FACTOR
| 230µm | ASTM C 457 |
MAXIMUM VOLUME OF PERMEABLE VOIDS
| 15.0% | ASTM C 642 |
Freeze thaw resistance
| 100% (Excellent durability factor) | ASTM C 666 |
Salt Resistance
SALT-SCALING RESISTANCE
| 0.2 kg/m2 (0.04 lb/ft2) | ASTM C 672 |
Application
Curing Time
Curing is essential to optimize physical properties of the shotcrete and minimize plastic shrinkage. King® MS-W1 should be cured immediately
after material has reached initial set in accordance with ACI 308 “Guide to Curing Concrete”. Continuously moist cure for a minimum period of 7 days. Alternatively, moist cure for a minimum period of 24 hours and apply a curing compound that complies with ASTM C 309. Curing is particularly critical in rapid moisture loss conditions such as high temperatures, high winds and low humidity.
Setting Time
| Initial | 4 Hours |
| Final | 6 Hours |
Yield
Approx. 0.014 m3 (0.5 ft3) / 30 kg (66 lb)bag
* Yield in service may slightly vary according to projects conditions
SURFACE PREPARATION
Rock Surfaces:All surfaces to be in contact with King® MS-W1 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).
Repair or Rehabilitation:All surfaces to be in contact with King® MS-W1 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 20 mm (¾ inch) clearance behind any corroded reinforcing steel. The perimeter of the repair area should be saw-cut a minimum of 20 mm (¾ inch). Clean the area to be repaired with potable water, leaving the concrete saturated but free of standing water (SSD).
MIXING
Place 75% of required water into mixer and slowly introduce entire bag of King® MS-W1 while the mixer is running. Allow King® MS-W1 to mix for a minimum of five minutes. Slowly add balance of required water until desired slump has been obtained, not exceeding maximum recommended volume of water.
Maximum recommended volume of water is 3.4 L (0.9 US gallon) per 30 KG (66 lb) bag. Continue mixing and stop only after material has reached a consistent, homogeneous mix.
APPLICATION
Apply in accordance with the ACI 506 “Guide to Shotcrete” publication.
| OPTIMUM PERFORMANCE |
- King® MS-W1 should not be applied when ambient, substrate and material temperatures are below 5 °C (40 °F) or above 35 °C (95 °F).
- For adverse temperatures, follow ACI recommendations for Cold/ Hot Weather Concreting.
CLEAN UP
Clean all tools and equipment after use with water. Once hardened, the product can only be removed mechanically.
