*Sika SikaCem 133 CP Gunite

Please note this product is now discontinued. Please see Sikacem 133F as a possible alternative, or contact our Technical Team on 01462 421333 for further advice.

Sika SikaCem 133 CP Gunite is a cement based one component repair mortar containing limestone aggregate and meeting the requirements of Class R4 of BS EN 1504-3. Formerly Sikacrete CP.

Best Uses

Sika SikaCem 133 CP Gunite is formulated for machine applications using the dry process without set accelerators. Repairs and overlay may be profiled and trowel finished where necessary. Ideal for the large volume repair of bridges, marine structures, tunnels, conductive overlay for anode and mesh cathodic protection application.

SIka SikaCem 133 CP Gunite is suitable for external and internal 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
• Rapid strength gain without caustic set accelerators
• Can be finished to a high standard
• Overcoatable with Sika reprofiling / levelling mortars and coatings

Application

Concrete
The concrete shall be free from dust, loose material, surface contamination and materials which reduce bond or prevent suction or wetting by repair materials.

Steel reinforcement
Rust, scale, mortar, concrete, dust and other loose and deleterious material which reduces bond or contributes to corrosion shall be removed to a minimum standard of SA2½. Reference should also be made to BS EN1504-10:2003 for specific requirements.

Concrete
Delaminated, weak, damaged and deteriorated concrete and where necessary sound concrete shall be removed by suitable mechanical or very high pressure water blasting [up to 110 mPa (16500 psi)] 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 90 degrees to avoid undercutting and a maximum angle of 135o to reduce the possibility of debonding with the top surface of the adjacent sound concrete and should be roughened sufficiently to provide a mechanical key between the original materia and SikaCem® -133CP Gunite repair mortar.

Ensure sufficient concrete is removed from around reinforcement to allow coating and compaction of the repair material.

Steel reinforcement:
Surfaces should be prepared using abrasive blast cleaning techniques or high pressure water blasting [up to 60 mPa (9000 psi)] techniques. Where exposed reinforcement is contaminated with chloride or other material which may cause corrosion, the reinforcement shall be cleaned by low pressure water blasting [up to 18 mPa (2700 psi)].

Reinforcement corrosion protection coating:
Where a coating is required as a barrier, apply to the whole exposed circumference two coats of SikaTop® Armatec-110 EpoCem®. (Refer to the relevant Product Data Sheet). Reference should also be made to BS EN1504-10:2003 for specific requirements.

SikaCem® -133CP Gunite is fed into the dry process spraying machine. The amount of water added is controlled by the nozzleman and should be sufficient to prevent slump and dust. Rebound will be increased with a dry mixture and thin layers. The 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 surface and allow to surface dry to a dark matt appearance.

SikaCem® -133CP 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. Reference shall be made to BS EN1504-10:2003 for specific requirements, the Code of Practice for sprayed concrete issued by the Concrete Society and any other guidelines that are specific to the structure.