Description

Two component, polymer modified cementitious blow hole filler

Uses

Renderoc BF2 is designed for application to imperfections in concrete and masonry surfaces.

It is suitable for application in the range 0 to 6 mm, and can be used in the following situations:

• Filling blow holes prior to overcoating
• General reprofiling over large areas
• Reprofiling, in association with other Renderoc mortars

Advantages

• Cost effective/time saving – no independent primer or curing agents required
• High performance – excellent bond to substrate
• User friendly – gauging liquid supplied to overcome mixing problems, ideal for remote locations
• Cost effective – allows part mixing

Description

Renderoc BF2 is supplied as a ready to use blend of dry powders which requires only the site addition of the liquid component to produce a highly consistent cementitious mortar, with good handling characteristics.

Renderoc BF exhibits excellent thermal compatibility with concrete and is fully compatible with other Renderoc* mortars and Dekguard* protective coatings.

Properties

The following results were obtained at a powder:liquid ratio of 1:0.3 by weight (or 3:1 by volume).

Note: Working life and setting time will vary dependent on ambient, substrate temperatures and wind speed.

Design criteria

Renderoc BF2 is designed for vertical and overhead use to infill surface imperfections of concrete in the range 0 to 6 mm.

Instructions for use

Preparation

Clean the surface and remove any dust, unsound material, plaster, oil, paint, grease, corrosion deposits or algae.

Roughen the surface to remove any laitance and expose the fine aggregate by light scabbling or sweep blasting.

Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser.

The effectiveness of decontamination should then be assessed by a pull-off test.

The cleaned areas should be blown clean with oil-free compressed air before continuing.

All prepared areas should be thoroughly soaked with clean water immediately prior to the application of Renderoc BF2.

Any residual surface water should be removed prior to commencement.

Mixing

Care should be taken to ensure that Renderoc BF2 is thoroughly mixed. In all cases the powder component should be added to the liquid component.

Mixing should be carried out in a suitably sized mixing vessel, using a slow speed (400/500 rpm), heavy duty drill and Fosroc mortar paddle.

Place the 3.0 litres liquid component into the mixer and, with the machine in operation, add one full 10 kg bag of powder, then mix for 3 – 5 minutes, again until fully homogeneous.

Part mixing may be adopted ensuring that the components are mixed in a 3:1 ratio, by volume of powder to liquid. Powder should be loose-filled to excess, than struck off level with the top of the measuring container.

Measure out one part of the single part liquid component into the mixing vessel and slowly add the 3 parts of powder, with the mixing paddle in operation. Mix for 3 to 5 minutes, paying close attention to the bottom and sides of the mixing vessel, until a fully homogenous paste is achieved.

Renderoc BF2Ö

Application

Apply the mixed Renderoc BF2 to the blow holes by steel trowel. It should be applied with the minimum of working and be allowed to partly set before finally troweling to a smooth finish. If a very smooth finish is required, a small amount of water may be flicked on to the surface of the Renderoc BF2 with a paint brush prior to final troweling.

Curing

Curing is not generally required. However, under extreme conditions – high temperatures and drying winds – use Nitobond AR*h as a curing agent, or cover the surface with polythene sheeting, taped down at the edges.

Nitobond AR does not require mechanical removal prior to overcoating with Dekguard system.

Cleaning

Renderoc BF2 should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically.

Overcoating with protective/decorative finishes

Renderoc BF2 may be overcoated after 48 hours, in ambient conditions of up to 75% relative humidity dependant on the type of coating. For further information consult the local Fosroc office before proceeding.

Limitations

• Renderoc BF2 should not be used when the temperature is below 5°C and falling
• Do not proceed with the application when rainfall is imminent unless in a sheltered or protected situation

If any doubts arise concerning temperature or substrate conditions, consult the local Fosroc office

High temperature working

At ambient temperatures above 35°C, the components should be placed in air-conditioned storage of less than 25°C, for special application procedures, refer to your local Fosroc office.

Estimating

Supply                                                                   

Renderoc BF2                    : 10 kg powder + 3 litre liquid

Yield                                                                      

Renderoc BF2                    : 7.4 litres per pack

Actual coverage of Renderoc BF2 will be wholly dependent upon the general substrate condition. It is recommended, therefore, that site trials over a typical area are carried out to determine actual usage.

Storage

All products have a shelf life of 12 months if kept in a dry store in the original, unopened bags or packs @ 25°C. If stored at high temperatures and/or high humidity conditions the shelf life may be considerably reduced to 4 to 6 months.

Precautions

Health and safety

Renderoc BF2 contains cement powders which, when mixed or become damp, release alkalis which can be harmful to the skin. During use, avoid inhalation of dust and contact with skin and eyes. Wear suitable protective clothing, gloves, eye protection and respiratory protective equipment.

The use of barrier creams provides additional skin protection. In case of contact with skin, rinse with plenty of clean water, then cleanse with soap and water.

In case of contact with eyes, rinse immediately with plenty of clean water and seek medical advice. If swallowed, seek medical attention immediately – do not induce vomiting.

For further information, refer to the Product Material Safety Data Sheet.

Fire

Renderoc BF2 is a non-flammable product.