POLYMER MODIFIED DRY SPRAY REPAIR MORTAR

Preparation
It is essential that adequate preparation is carried out prior to the application of SpECbuild S10. This preparation should ensure the removal of all grease, oil and loose material.
The area to be reinstated using SpECbuild S10 should be cut back to a depth of at least 10mm. To avoid “feather edging”, it is advisable to neatly delineate the repair boundary by saw cutting to a depth of 10mm.

All corroded steel should be completely exposed including the rear of the bar to enable thorough cleaning. It is recommended that grit blasting be used to clean the reinforcing steel and particular attention should be paid to the rear of the bar to ensure all corrosion products have been removed.

Once the reinforcing steel has been cleaned it should be coated immediately with one coat of SpECcoat Zn25.

Substrate Priming
Normally, it will only be necessary to pre-soak the substrate with clean water for a period of at least one hour, prior to the application of the repair compound. Obviously all water should be drained from the formwork prior to commencing with the application of the repair material.

Application
Exposed steel reinforcing bars should be firmly secured to avoid movement during the application process as this will affect mortar compaction, build and bond.

SpECbuild S10 should be emptied from the bags directly into the hopper of the dry spray process machine. The amount of water added should be controlled by the nozzleman. too little water will increase rebound and dust emission, too wet a mix will slump.

If sagging occurs during application to vertical or overhead surfaces, the SpECbuild S10 should be completely removed and re-applied at a reduced thickness on to the correctly reprimed substrate.

Finishing
SpECbuild S10 is finished by striking off with a straight edge and closing with a steel float. Wooden or plastic floats, or damp sponges may be used to achieve the desired surface texture. The completed surface should not be overworked.

Curing
SpECbuild S10 must be cured immediately after finishing in accordance with good concrete practices using wet hessian or polyethylene sheet.