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• Features & Benefits
• Application Notes
• Limitations

Features & Benefits

• Supplied as a ready to use blend of dry powders requiring only the site addition of clean water to produce a highly consistent, lightweight repair mortar
• Based on Portland cements, graded aggregates and chemical additives which provide a mortar with good handling characteristics while minimising water demand
• Compatibility with non-structural concrete of compressive strength 15 - 25 N/mm²
• Lightweight formulation enables extra high-build — fewer cold joints
• Frequently obviates the need for formwork
• Polymer-modification provides extremely low permeability to water, carbon dioxide and chlorides
• Exceptional system of shrinkage compensation provides long-term dimensional stability
• One component, pre-bagged to overcome site-batched variations
• Contains no chloride admixtures

Uses

• Specifically engineered for vertical repair work
• Can be applied in sections up to 100mm thickness in vertical locations and up to 60mm thickness in overhead locations in a single application and without the use of formwork
• Thicker sections can be achieved by the use of formwork or can be built up in layers
• Deep pockets can sometimes be filled in a single application dependent on the configuration of the pocket and the volume of exposed reinforcing steel
• Can be quickly and efficiently applied by the wet spray technique

Application Notes

• Reinforcing steel can be primed with one full coat of Nitoprime Zincrich Plus prior to application
• Concrete can be primed by scrubbing Nitobond HAR into the surface
• In exceptional circumstances, e.g. where a substrate/repair barrier is required or where the substrate is wet or likely to remain permanently damp, Nitobond EP bonding aid should be used
• A forced-action mixer is essential. 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 for the occasional one-bag mix
• Apply by gloved hand or trowel
• Additional build-up can be achieved by application of multiple layers. The surface of the intermediate layers should be comb scratchkeyed and cured with Nitobond AR
• Renderoc HB can be quickly and efficiently applied by the wet spray technique. In circumstances where large areas of repair are required, the rapid placement and higher build attainable by this method offer economic advantages over hand-trowelling. The resultant repair also offers a generally more dense compound with enhanced mortar/substrate bond characteristics
• In cold conditions down to 3°C, the use of warm mixing water (up to 30°C) is advisable to accelerate strength development. At ambient temperatures above 35°C, the material should be stored in the shade and cool water used for mixing
• The use of Nitobond AR, sprayed on to the surface of the finished mortar in a continuous film, is recommended. A low pressure atomising sprayer is essential for applying the Nitobond AR
• Large areas should be cured as trowelling progresses (0.5 m2 at a time) without waiting for completion of the entire area
• The Dekguard range of protective, anti-carbonation coatings products may be applied over the repair area without prior removal of the Nitobond AR curing membrane
• Should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically
• Yield: Approximately 14.5 -15.0 litres / 18 kg bag (approx. 1.5 m² at 10mm thickness)
• The material should not be applied at less than 10 mm thickness

Note: the actual yield per bag will depend on the consistency used. The yield will be reduced if the material is applied by a spray technique.

Limitations

• Should not be used when the temperature is below 3°C and falling
• Free-fall mixers must not be used. Mixing of part bags should never be attempted
• Due to the nature of Renderoc HB, the product should not be used in areas subjected to traffic (in these circumstances, Renderoc S should be considered)
• Should not be exposed to moving water during application
• Exposure to heavy rainfall prior to the final set may result in surface scour
• Renderoc HB is non-flammable
• As with other ‘one pack’ repair mortars, Renderoc HB 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