SikaRepair®-225
SikaRepair®-225 is a 1-component, pre-packaged, ready-to-use, cementitious, silica fume, fibre-reinforced, high strength, shrinkage-compensated mortar. Formulated for application by low pressure spray. It is designed especially for repair of overhead and vertical surfaces.
- Ready-to-use, one-component material
- Easy to prepare, just add water
- Sprayable system
- Superior workability. Can be troweled and screeded after application
- Labour-saving system
- Superior abrasion resistance over conventional cement mortar
- Bond strength ensures superior adhesion.
- Not a vapour barrier
- Compatible with coefficient of thermal expansion of concrete
- Increased resistance to de-icing salts
- Good freeze/thaw resistance
- Very low shrinkage
- Silica fume enhanced
- Fibre-reinforced
- Formulated with inert, non-reactive aggregates to eliminate potential Alkali-Aggregate Reactivity (AAR)
- Compatible modulus of elasticity to concrete generally used for building/facade construction
Usage
- High performance repair mortar for wet spray application. Suitable for new construction, repairs and maintenance work
- Above and below grade on concrete and mortar.
- Vertical and overhead surfaces
- Structural repair material for parking structures, industrial plants, walkways, bridges, tunnels, ramps, and dams etc.
Advantages
- Ready-to-use, one-component material
- Easy to prepare, just add water
- Sprayable system
- Superior workability. Can be troweled and screeded after application
- Labour-saving system
- Superior abrasion resistance over conventional cement mortar
- Bond strength ensures superior adhesion.
- Not a vapour barrier
- Compatible with coefficient of thermal expansion of concrete
- Increased resistance to de-icing salts
- Good freeze/thaw resistance
- Very low shrinkage
- Silica fume enhanced
- Fibre-reinforced
- Formulated with inert, non-reactive aggregates to eliminate potential Alkali-Aggregate Reactivity (AAR)
- Compatible modulus of elasticity to concrete generally used for building/facade construction
Packaging
25 kg (55 lb) bag
Colour
Powder / Concrete Grey
Product Details
Shelf Life
12 months
Storage Conditions
Store (unopened) in a dry place at temperatures between +5 °C and +32 °C (41 °F and 89 °F). For best results, condition product at temperatures between +18 °C and +29 °C (65 °F and 84 °F) before using.
Compressive Strength
| 1 day | 23 MPa (3 335 ) |
| 7 days | 35 MPa (5 076 ) |
| 28 days | 55 MPa (7 977 ) |
| Temperature | +23 °C (73 °F) | +23 °C (73 °F) |
| Dosage | 1 bottle (150 mL) | 2 bottles (300 mL) |
| 12 hours | 3 (435) | 5 (728) |
| 1 day | 24 (3 480) | 29 (4 205) |
| 3 days | 28 (4 060) | 31 (4 495) |
| 28 days | 54(7 830) | 56 (8 208) |
Note: All moulds, mixing tools and powder components were pre-conditioned to the test temperatures. Prepared test specimens were cast and then cured at the indicated test temperatures until the time of testing.
Sikacem® Accelerator added to mix water (water content = 3.32 L (0.87 US gal.) + 1 bottle of Sikacem® Accelerator; water content = 3.14 L (0.82 US gal.) + 2 bottles of Sikacem® Accelerator).
Splitting Tensile Strength
| ~5.2 MPa (~754 psi) | (ASTM C496) 28 days |
Application
Mixing Ratio
Mix mortar with approx. 3.5 - 3.9 L (0.9 - 1.0 US gal.) of water per 25 kg (55 lb) bag.
Initial Set Time
| 2 - 3 h | (ASTM C266) |
Final Set Time
| 5 h - 6 h 30 min | (ASTM C266) |
Yield
Approx. 13 L (0.459 ft3)
General guidance: Allow 22 - 25 kg/m2 (4.5 - 5 lb/ft2) per 12 mm (1/2 in) applied thickness.
MIXING
Conventional wet-process shotcreting equipment such as the low-pressure Moyno spray or screw type machine should be used. Set up wet-process shotcrete equipment; then add the water directly into mixer. Start the mixer in motion and add SikaRepair-225 mortar while continuing to mix. Mix to uniform consistency (approx. three (3) minutes after all ingredients are added).
APPLICATION
At time of application, surfaces should be saturated surface dry (SSD) but hold no standing water. Apply SikaRepair®-225 powder by low pressure spraying to repair vertical or overhead surfaces. Shoot SikaRepair®-225 perpendicular to the surface. This minimizes rebound, creates the smoothest pattern (reduces “bumps”) and properly encases the rebars. The velocity of SikaRepair®-225 is sufficient if, at a distance of 450 - 600 mm (18 - 24 in), SikaRepair®-225 pattern flattens out on contact with the surface and the rebars are encased. After applying SikaRepair®-225, allow it to stiffen sufficiently before shaving or finishing. Before applying the next layer, allow SikaRepair®-225 to set sufficiently so as not to disturb the preceding layer. This will take anywhere from 45 minutes to several hours, depending on mix consistency, and ambient temperature, wind conditions and humidity. Begin and finish a given patch on the same day.
CURING TREATMENT
As per ACI 308 recommendations for cement concrete, curing is required. To achieve performance consistent with Technical Data, curing must be provided by recognized curing methods, such as wet burlap covered with white polyethylene film or approved water-based curing compound, such as Sika® Florseal WB-18 & -25. Alternatively, the use of Sika® Ultracure DOTTM or NCFTM wet curing blankets is strongly recommended. Curing must commence immediately after placing and finishing. Moist-curing must be maintained for the first 24 hours only. Protect freshly applied mortar from direct sunlight, wind, rain and frost.
CLEAN UP
Clean all tools and equipment after use with water. Once hardened, the product can only be removed manually or mechanically.
