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Technical Dayta Sheet Compedium

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING ROOFING WATERSTOPS WATERPROOFING JOINT FILLERS TIMBER FLOORING ALPHABETICAL Fosroc® Renderoc BB Application Instructions Preparation Mark out the mortar pad perimeter ensuring that the mortar pad extends beyond the edge of the bearing by a minimum of 50 mm, as per the requirements of RTA B284 for elastomeric bearings held in place by friction alone. Saw cut the marked out mortar pad perimeter to a depth of 5-10 mm into the substrate and lightly scabble or needle gun the substrate within the perimeter. The prepared surface should then be cleaned by way of a high pressure water jet to remove any dust from the surface. Substrate priming Following the installation of water tight form work, pre-soak the substrate with clean water for as long as practical but not less than 3 hours. When ready to apply the mortar, removed excess pre-soaking water to leave a saturated surface dry substrate to which the Renderoc BB should be applied before the substrate dries substantially. No primer is required providing the above pre-wetting is carried out. 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. Contact your local Parchem sales office for further information. Mixing Care should be taken to ensure that Renderoc BB is thoroughly mixed. A forced-action mixer is essential. Mixing in a suitably sized drum using an appropriate spiral paddle such the Protool HS2 140 x 600 M14 Helical mixing paddle (product code: TT-614217) or equivalent at a slow speed (400/500 rpm) using a heavy-duty mixer, 1500W such as Protool MXP 1602 E (product code: TT-621941) or equivalent is acceptable for the occasional one-bag mix. Free-fall mixers must not be used. Mixing of part bags should never be attempted. For normal applications, place drinking quality water into the mixer and, with the machine in operation, add 1 full 20 kg bag of Renderoc BB and mix for 3 - 5 minutes until fully homogeneous. Never exceed the maximum water addition. Note that the powder must always be added to the water. Mixing Water Required per 20 kg bag Dry pack: 1.58 – 1.86 litres Trowelable: 1.86 – 2.46 litres Flowable: 2.46 – 2.66 litres Application Apply the mixed Renderoc BB to the prepared substrate by gloved hand, trowel or pouring into formwork. In the case of an elastomeric bearing held in position by friction alone, extend the mortar pad beyond the edge of the bearing a minimum of 50mm outside the edge of the bearing. In the areas outside these minimum extents, the mortar pad top surface must slope away from the bearing. Finishing Renderoc BB is finished by striking off with a straight edge and then finishing with a wooden float. 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 be stored in the shade and cool water used for mixing. Curing Renderoc BB is a cement based mortar and as such it should be cured immediately after finishing in accordance with good concrete practice. Good curing can be achieved by applying Concure A99 to the mortar pad immediately after finishing at a rate of 5m² per litre. Concure A99 meets the curing requirements of AS3799. Note that curing compounds that could reduce the friction between the mortar pad and bearing or materials that may react with the bearing should not be used (eg., wax or hydrocarbon based curing compounds). Cleaning Nitobond HAR, Concure A99 and Renderoc BB should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically. Equipment used with Nitobond EP should be cleaned with Solvent 10. Limitations Renderoc BB should not be used when the temperature is below 5°C and falling. Do not mix part bags. If any doubts arise concerning temperature or substrate conditions, consult your local Parchem sales office. The size of the Renderoc BB mortar pad should be as small as practical but not less than the requirements of RTA B284 for elastomeric bearings held in place by friction alone. That is, the mortar pad should extend beyond the edge of the bearing by a minimum of 50 mm. With this in mind it is recommended that individual Renderoc BB mortar pads are placed for each elastomeric bearing. The Renderoc BB should not be applied in dimensions larger than 1m². If any doubts arise concerning the size of the mortar pads consult your local Parchem sales office. INDEX 136 Page 2


Technical Dayta Sheet Compedium
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