Sika SikaCem Gunite 133F

Sika SikaCem Gunite 133F is a cement based, fast setting, polymer modified one component repair mortar meeting the requirements of Class R4 of BS EN 1504-3.

Best Uses

Sika SikaCem Gunite 133F is formulated for machine application using the dry process without set accelerators. Repairs may be profiled and trowel finished where necessary.

Sika SikaCem Gunite 133F is ideal for large volume repairs to bridges, marine structures, tunnels and façades. Suitable for both interior and exterior use in place of R1, R2 and R3 mortars.

• One component, ready to use micro concrete
• Non silica aggregates
• Low rebound losses and dust formation during the spraying process
• Layer thickness's in one application overhead up to 150mm are possible without any additional mesh reinforcement
• Rapid strength gain without set accelerators
• Very low shrinkage
• Can be finished to a good standard
• Fibre Technology reduces shrinkage cracking and improves toughness
• Fast setting properties & fibres reduces the effect of tidal wash out in coastal or rising water situations

Application

Concrete:
The concrete shall be thoroughly clean, free from dust, loose material, surface contamination and materials which reduce bond or prevent suction or wetting by repair materials. De-laminated, weak, damaged and deteriorated concrete and where necessary sound concrete shall be removed by suitable mechanical or very high pressure water blasting techniques. Tying wire fragments, nails and other metal debris embedded in the concrete should be removed where possible. The edges where concrete is removed should be cut at a minimum angle of 90o to avoid undercutting and a maximum angle of 135° to reduce the possibility of de-bonding with the top surface of the adjacent sound concrete and should be roughened sufficiently to provide a mechanical key between the original material and Sika® Repair material.

Ensure sufficient concrete is removed from around the full circumference of the reinforcement to allow application of the reinforcement corrosion protection coating (If required) and compaction of the repair material.

Steel Reinforcement:
Rust, scale, mortar, concrete, dust and other loose and deleterious material which reduces bond or contributes to corrosion shall be removed. Surfaces shall be prepared using abrasive blast cleaning or high pressure water-blasting techniques to a minimum standard of SA 2 (ISO 8501-1) If these types of techniques are not permissible contact our technical team for alternative options using hand preparation techniques and Galvanic Anodes. Where exposed reinforcement is contaminated with chloride or other material which may cause corrosion, the reinforcement shall be cleaned by low pressure water blasting.

SikaCem® -133F Gunite is fed into the dry process spraying machine which should be of suitable size for the repair areas to reduce wastage and rebound. The amount of water added is controlled by the nozzleman at the nozzle and should be sufficient to prevent slump and dust. Rebound will be increased with unsuitably sized spraying machine, compressor, nozzle type, dry mixture and thin layers.

Reinforcement Corrosion Protection:
Where a reinforcement coating is required the application of the repair mortar shall be applied when the reinforcement coating has cured (Minm finger nail hard). Refer to the System Information above for compatible Sika products and refer to the relevant Product Data Sheet for more detailed information about the reinforcement corrosion product.

The sprayed repair mortar shall be placed onto the pre-wetted substrate between the minimum and maximum layer thickness's without the formation of voids and loose rebound material. Where layers are to be built up to prevent sagging or slumping, each layer should be allowed to stiffen before applying subsequent layers “wet on wet”. When layers cannot be applied “wet on wet”, pre-wet the surface and allow to surface dry to a dark matt appearance.

SikaCem® -133F Gunite is finished by leaving ‘as shot’ or striking off with a straight edge and closing the surface with a wooden/plastic float or damp sponge to achieve the desired surface texture. Fibres will be exposed on the final finish. For a smooth fibre free surface use SikaCem® -133S Gunite as final layer (see separate Product Data Sheet).