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• Features & Benefits
• Application Notes
• Limitations

Features & Benefits

• Supplied as a ready to use blend of dry powders which requires only the site addition of clean water to produce a highly consistent repair mortar
• Based on Portland cements, graded aggregates, and chemical additives providing a unique blend with good handling characteristics while minimising water demand
• Low water requirement ensures rapid strength gain and long-term durability
• Rapid strength gain — will generally accept traffic in 2 hours at 20°C reducing downtime
• Versatile - consistency can be adjusted to suit the application
• High strength, abrasion and weather resistance, making it ideal for external works
• May be left as a trafficable finish
• Suitable to be overlaid with compatible deck membranes and coatings when the moisture content is <6%, typically 3-4 hours after final setting
• One component, pre-bagged to overcome site- batched variations requires only the site addition of clean water
• Does not normally require a primer to achieve high bond strengths
• Shrinkage compensation ensures no cracking
• Controlled heat of hydration minimizes risk of thermal cracking, even in thick sections
• Contains no chloride admixtures
• Suitable for use with Cathodic Protection systems
• Alkaline in nature and will protect embedded steel reinforcement
• Low water requirement ensures rapid strength gain and long-term durability
• Please refer to the Product Data Sheet for full details of:
  • Properties
  • Specification Clause
  • Standards Compliance
  • Product Installation
  • Estimating
  • Storage
  • Health and Safety

Uses

• Rapid and permanent reinstatement of discrete thick section areas in concrete carriageways, pavements, airport aprons, access ramps, floors, columns and beams
• May be applied in depths between 25 and 250mm in bays of up to 4m2. Larger areas can be reinstated using a chequer-board “hit and miss” approach
• When used with a low water content, Patchroc 250 is designed for horizontal use, though it can be applied at gradients up to 2.5%
• When used with a high water content, Patchroc 250 becomes flowable and can be applied into shuttered areas of congested reinforcement such as beams and columns
• May be used internally and externally

Application Notes

• Prime reinforcing steel with one full coat of Nitoprime Zincrich Plus and allow this to dry before continuing
• For multiple bag batches a forced-action mixer is essential. For smaller volumes where single bag mixes are more appropriate, mixing in a suitably sized drum using an approved Renderoc Mixing Paddle (MR4) with a slow speed (400/500 rpm) heavy-duty drill is acceptable
• Can be applied between thicknesses of 25 - 250mm in a single application
• The material should not be applied when the substrate and/or air temperature is 5°C and falling
• Where the completed product application is to be overcoated with a resin based surfacing system, such as Nitodek FS, Nitoflor Coarse Anti-Slip Grains should be broadcast onto the finished surface immediately after application
• In fast drying conditions, curing with either Concure WB, Nitobond AR or polythene sheeting taped down at the edges must be used
• Patchroc 250 should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically
• Yeild: Approximately 12 litres / 25kg bag

Note: the actual yield per bag of Patchroc 250 will depend on the consistency used.

Limitations

• Should not be exposed to moving water during application
• Exposure to heavy rainfall prior to the final set may result in surface scour
• Free-fall mixers must not be used. Mixing of part bags should never be attempted
• As with other ‘one pack’ repair mortars, Patchroc 250 may exhibit satisfactory handling characteristics even though inadequately mixed. This will result in a significantly lower level of performance or possible failure. It is therefore essential that mixing instructions are strictly adhered to with particular emphasis on the quantity of water used and the time of the mixing operation