SikaCem®-900 Geo W
HIGH STRENGTH GEOPOLYMER SHOTCRETE MATERIAL FOR WET-MIX PROCESS APPLICATIONS
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SikaCem®-900 Geo W is a one-component, pre-packaged, ultrafine, fiber reinforced, high strength, and shrinkage-compensated geopolymer shotcrete material formulated for wet-process applications.
- Ready-for-use, one-component material; just add water
- Increased resistance to acids and other highly caustic environments
- Superior workability and shooting pumpability
- Superior abrasion resistance over conventional Portland cement mortar
- High bond strength ensures superior adhesion
- Compatible with coefficient of thermal expansion of concrete
- Good freeze/thaw resistance
- High early strengths
- Very low shrinkage
- Fiber reinforced
Usage
- Structural material for repair and reline surfaces for sewers, pipes, culverts, inverts, tunnels, manholes, water and wastewater treatment plants, and industrial plants
- Vertical and overhead surfaces
- Multiple application techniques including spraying and centrifugal casting
- On grade, above grade, and below grade on concrete and mortar
Advantages
- Ready-for-use, one-component material; just add water
- Increased resistance to acids and other highly caustic environments
- Superior workability and shooting pumpability
- Superior abrasion resistance over conventional Portland cement mortar
- High bond strength ensures superior adhesion
- Compatible with coefficient of thermal expansion of concrete
- Good freeze/thaw resistance
- High early strengths
- Very low shrinkage
- Fiber reinforced
Packaging
65 lb bag (29.5 kg)
2000 lb supersack (907 kg)
Product Details
Shelf Life
12 months in original, unopened packaging
Storage Conditions
Store in a dry, covered area, protected from the elements
For optimum performance it is recommended to store the material between 40°F - 95°F (5°C - 35°C)
Protect from moisture. If damp, discard material.
Abrasion Resistance
ASTM C1138 |
28 Days | 0.039 kg (0.26%) mass loss 1.22 in3 (0.28%) volume loss |
Compressive Strength
ASTM C39/ C109 |
1 day | 2,500 psi (17.25 MPa) |
28 days | 8,000 psi (55.0 MPa) |
Flexural Strength
ASTM C78 |
28 days | 1,200 psi (8.25 MPa) |
Modulus of Elasticity in Flexure
ASTM C469 |
28 days | 3.9 x 106 psi (26.8 GPa) |
Tensile Strength
ASTM C496 |
28 days | 520 psi (3.5 MPa) |
Shear Strength
Bond Strength | ASTM C882 |
28 days | 3000 psi (20.5 MPa) |
Shrinkage
ASTM C596 |
28 days | 0.02% |
Chemical Resistance
ASTM C267 |
Sulfuric Acid (pH 1.0) | Zero mass loss Zero volume loss |
Freeze-Thaw Stability
ASTM C666 |
300 Cycles | Zero mass loss |
No cracking or severe deterioration with light surface scaling
Application
Fresh mortar density
144.2 lb/ft3 (2.31 kg/L)
Ambient Air Temperature
40 °F - 95 °F (4 °C - 35 °C)
Mixing Ratio
7.8 - 8.3 pints per 65 lb bag (3.7 - 4.0 L per bag)
30 - 32 US gal per 2000 lb supersack (113.5 - 121.5 L per supersack)
0.120 - 0.128 pints of water per lb of product
Substrate Temperature
40 °F - 95 °F (4 °C - 35 °C)
Set Time
Initial | 20 - 30 min |
Final | 30 - 40 min |
Time begins when product is applied to substrate.
Coverage
0.51 ft³ (0.014 m³) per 65 lb bag
0.58 yrd3 (0.450 m³) per 2000 lb Supersack
Yield figures do not include allowance for surface profile and porosity, or material waste
SURFACE PREPARATION
- Surfaces must be clean and sound. Remove all deteriorated concrete, dirt, dust, oil, grease, contaminants and other bond-inhibiting materials from the area to be repaired
- To ensure optimum repair results, the effectiveness of decontamination and substrate preparation can be assessed by a Pull-Off test (i.e Tensile Adhesion test per ASTM C1583)
- Saw cutting the perimeter edges of the repair area is recommended, preferably cut at a dovetail angle
- Remove any and all protruding material i.e brick, concrete, mortar, etc.
- Ensure that any and all leaks are stopped prior to application
MIXING
- Pour 7.8 pints (3.7 liters) of clean water per 65 lb bag into a suitably sized mixing container
- Add product to the container while continuously mixing with a low-speed rotary drill (400 - 600 rpm), and paddle or a concrete mixer
- Add up to an additional maximum 0.5 pint (0.23 liter) of water, if needed, for the desired consistency
- Do not overwater. Excess water may cause segregation
- Mix to a uniform consistency, maximum 5 minutes. Thorough mixing and proper proportioning are necessary
APPLICATION
Apply 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
- Product should not be applied when ambient, substrate, and material termperatures are below 40 °F (5 °C) or above 95 °F (35 °C).
- For adverse temperatures, follow ACI recommendations for Cold/Hot Weather Concreting.
FINISH
- If needed, a troweling finish can be done following initial set of the surface in an upward direction. Do not over trowel the surface. For standard sewage repair, a smooth finish is not recommended, as it will decrease the water discreted from the product during final set and curing.
Contact your Sika STM Technical Representative for more information.