King® MS-W1 UG
SHOTCRETE MATERIAL FOR WET-MIX PROCESS FOR UNDERGROUND APPLICATIONS
King® MS-W1 UG is a pre-blended, pre-packaged, 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.
- Improved pumpability and shootability
- Improved adhesive and cohesive plastic properties
- Significantly reduced rebound, resulting in lower material usage
Usage
- Ground support applications for mining, tunneling and other underground openings
- Construction of underground bulkheads, backfill barricades, pillars, ventilation walls and other underground concrete structures
Advantages
- 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
- Low permeability
- Low shrinkage
- Liquid accelerator can be added at the nozzle to reduce set time and increase early-age strength gain. Contact your local Sika Technical Representative for more information.
- Significantly increased load-carrying capacity
- Significantly increased energy absorption capacity (toughness)
- Significantly increased impact resistance
- King® MS-W1 UG with Gradation No. 1, the name of the product would be King® MS-W1 UG G1
- King® MS-W1 UG with a high dosage of macro-synthetic fibre and Gradation No. 2, the name of the product would be King® MS-W1 UG MFB.
- King® MS-W1 UG with a medium dosage of steel fibre and Gradation No. 2, the name of the product would be King® MS-W1 UG STB.
Packaging
- 30 kg (66 lb) triple-lined bags
- 1 000 kg (2 205 lb) FIBC
*Custom packaging is available to suit specific project requirements
Product Details
APPROVALS / CERTIFICATES
GRADATION
- By default King® MS-W1 UG is blended to meet ACI 506 “Guide to Shotcrete”, Table 1.1, Gradation No. 2
- MS-W1 UG G1 is blended to meet ACI 506 “Guide to Shotcrete”, Table 1.1, Gradation No. 1
Shelf Life
12 months in original, unopened packaging
Storage Conditions
Material should be stored in a dry, covered area, protected from the elements. Physical properties of may be adversely aff ected if material is
stored in temperatures below 0 °C (32 °F). Material stored below these temperatures should be allowed to warm to ambient underground
temperatures before shooting.
Compressive Strength
| 8 Hours | 5 MPa (725 psi) |
| 12 Hours | 10 MPa (1500 psi) |
| 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 |
| King® MS-W1 UG | King® MS-W1 UG ST | |
| 28 days | 6.5 MPa (940 psi) | 8 MPa (1160 psi) |
Porosity
BOILED ABSORPTION
| 6.0% | ASTM C 642 |
MAXIMUM VOLUME OF PERMEABLE VOIDS
| 15.0% | ASTM C 642 |
Application
Flowability
SLUMP*
| 200 mm (8") ± 50 mm (2") | ASTM C 143 |
Pot Life
4 hours*
Curing Time
Good curing conditions are beneficial to optimizing the physical properties of King® MS-W1 UG. Although the high relative humidity commonly found in underground environments provides for good curing conditions, additional curing is often appropriate and should be performed in accordance with ACI 308 “Guide to Curing Concrete”.
Setting Time
| Initial | < 10 minutes |
| Final | < 45 minutes |
Yield
Approx. 0.465 m3 (16.5 ft3) / 1,000 KG (2,205 lb) bag
* Yield in service may slightly vary according to projects conditions
SURFACE PREPARATION
All surfaces to be in contact with King® MS-W1 UG 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).
MIXING
Mix material at a maximum water content of 92.6 L (24.5 US gallons) per 1,000 KG (2,205 lb) bag. For mixing instructions, follow recommendations of concrete mixer manufacturer. For custom mix designs developed to meet specific project requirements, contact your local Sika Technical Representative.
APPLICATION
Apply King® MS-W1 UG in accordance with the ACI 506 “Guide to Shotcrete” publication.
OPTIMUM PERFORMANCE
- Product should not be applied when ambient, substrate and material temperatures are below 5 °C (40 °F).
- Performance of in-place shotcrete relies heavily upon application techniques. To ensure optimum quality of in-place shotcrete, the material, equipment and key personnel should be pre-qualified prior to project start-up.
CLEAN UP
Clean all tools and equipment after use with water. Once hardened, the product can only be removed mechanically.