CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Page 2 41 Fosroc® Patchroc C Reinforcing steel priming Apply one full coat of Nitoprime Zincrich to all exposed reinforcing steel and allow to dry before continuing. If any doubt exists about having achieved an unbroken coating, a second application should be made and, again, allowed to dry before continuing. Substrate priming The substrate should be thoroughly soaked with clean water and any excess removed prior to applying one coat of Nitobond AR or diluted Durafloor Level Prime (4:1 with water) and scrubbing it well into the surface. Patchroc C should be applied to the primed concrete as soon as the primer has become tacky. If the primer dries out, a fresh coat of primer should be applied, allowed to become tacky, then the Patchroc C applied immediately. Mixing Care should be taken to ensure that Patchroc C is thoroughly mixed. A forced-action mixer is essential. Mixing in a suitably sized drum using an approved spiral paddle in a slow speed (400/500 rpm) heavy duty drill is acceptable for the occasional one bag mix. Free fall mixers must not be used. Mixing of part bags should never be attempted. It is recommended that only one bag of Patchroc C is mixed at any one time to ensure that all the mortar can be placed within its working life. Place correct amount of drinking quality water into the mixer and, with the machine in operation, add one full 20 kg bag of Patchroc C and mix for 3 minutes until fully homogeneous. Do not mix for longer than this time to ensure that the available working life is not reduced. Note that powder must always be added to water. Application Apply the mixed Patchroc C on to the primed substrate as soon as possible after mixing. The mortar should be applied evenly by trowel and tamped in place with a wood float to ensure full compaction. Thoroughly compact the mortar around any exposed steel reinforcement. Patchroc C can be applied up to 200 mm thickness in single applications. Note: the minimum applied thickness of Patchroc C is 25 mm. Build-up Repair sections greater than 200 mm thickness can be achieved by application of multiple layers. In this instance, the surface of the intermediate layers should be scratchkeyed and allowed to set for a minimum of 2 hours before continuing. Repriming with Nitobond AR or Durafloor Level Prime and a further application of Patchroc C may proceed at this time. Finishing Patchroc C should be struck off to the correct level and finished with a steel trowel to fully close the surface. If a textured surface is required, this can be achieved using a suitable roller or brush. The completed surface should not be overworked. Low temperature working In cold conditions down to 5°C, the use of warm water (up to 30°C) is advisable to accelerate strength development. Normal precautions for winter working with cementitious materials should then be adopted. The material should not be applied when the substrate and/or air temperature is 5°C and falling. At 5°C static temperature or at 5°C and rising, the application may proceed. High temperature working At ambient temperatures above 35°C, the material should not be used as premature setting may occur. Curing Patchroc C is a cement-based repair mortar. In common with all cementitious materials, Patchroc C must be cured immediately after finishing in accordance with good concrete practice. The use of Nitobond AR or one of Fosroc’s Concure curing compounds, sprayed on to the surface of the finished mortar in a continuous film, is recommended. In fast drying conditions, supplementary curing with polythene sheeting taped down at the edges must be used. In cold conditions, the finished repair must be protected from freezing. Overcoating with protective finishes Patchroc C is extremely durable and will provide an excellent hard wearing surface to the repaired locations. Surrounding floor areas may benefit from the application of an abrasion or chemical-resistant protective coating. For internal locations, Parchem recommend the use of the Durafloor FC range of floor coatings. These products provide a decorative and uniform appearance as well as protecting areas of the floor which might otherwise be at risk. Durafloor FC products may be applied over the repair area after prior removal of the curing membrane generally after 3 days. Your local Parchem sales office should be contacted for advice about external protective overlayments. Cleaning Nitobond AR, Durafloor Level Prime and Patchroc C should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically. Equipment used with Nitoprime Zincrich should be cleaned with Solvent 10.
Technical Dayta Sheet Compedium
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