Flexcrete Steel Reinforcement Protector 841 is a two component, polymer modified, cementitious coating which is supplied with a convenient mixing kit. The advanced formulation contains corrosion inhibitors to passivate and protect steel reinforcement. It forms a highly alkaline coating with a degree of elasticity which defends against the effects of from acid gases, moisture and chlorides.

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• Features & Benefits
• Preparation
• Mixing
• Application
• Application Top Tips
• Technical Data

Features & Benefits

• UKCA & CE marked in accordance with EN 1504-7
• BBA Approved, Certificate No. 05/4276
• Listed under Regulation 31 - England and Wales: Regulation 33 - Scotland: Regulation 30 - NI: for use with potable water

Preparation

Reinforcement should be cleaned, preferably by the use of wet grit blasting to remove any loose rust or scale, back to a bright metal surface finish such as to Sa 2½, as defined in BS 7079: Part A1/ISO 8501 (SSPC.SP10) where possible. Alternatively, shot, water or equivalent blast cleaning techniques may be used.

If chlorides are absent from the concrete or environmental constraints preclude the use of blast cleaning, hand held power tools capable of achieving the necessary preparation can be used. Metal prepared in this way should be to St 2 or St 3 as defined in BS 7079: Part A1/ISO 8501 (SSPC.SP2 or SSPC.SP3).

Mixing

Mix as much material to apply within the working life. Place sufficient Component A (liquid) into a suitable mixing container and add the corresponding quantity of Component B (Powder).

Initial Mixing Ratio:

• Component B:A - 3:1 by volume
• Component B:A - 4:1 by weight

Mix together thoroughly for 2-3 minutes to a lump free consistency. Smaller amounts are mixed by hand, and larger amounts with a low-speed electric mixer in order to entrap as little air as possible. The mixed materials should have a brushable, barely dripping consistency. If necessary, the consistency can be adjusted by the addition of one or other of the two components. Do not add water or other materials.

• Note - These instructions must be adhered to as we will not be responsible for failure due to incorrect mixing.

All tools should be cleaned with water immediately after use. Materials can be stored in sealed buckets for 12 months in dry, frost free conditions at +20°C.

Application

Apply the first coat, by brush, onto the reinforcement as soon as possible, but no longer than 24 hours after preparation. Apply to a thickness of approximately 1mm and ensure freedom from pin-holes, voids and misses.

To give total protection a second coat is applied when the first is stable but not fully cured, typically 30-90 minutes (maximum 7 days). Inspect on completion and if necessary spot repair to ensure the reinforcement is fully protected. Avoid overpainting onto the adjacent concrete.

Ideally within 2-6 hours of completion (dependent upon ambient temperature), make good any areas of missing, spalled or removed concrete with the appropriate Flexcrete repair mortar.

• Note: Do not use Steel Reinforcement Protector 841 when the temperature is below 5°C and falling.

Application Top Tips

• Regularly check the coating thickness during application
• Hold a piece of cardboard behind the reinforcement to prevent excess application onto the parent concrete
• Take care during application to ensure that air is not entrapped into the surface
• Ideal for the corrosion protection of steel reinforcement subjected to long term exposure on interrupted construction programmes
• Cold Weather Working - ≥3°C on a rising thermometer, ≥5°C on a falling thermometer. Do not use any Part A which has been frozen
• Hot Weather Working - Store material in cool conditions to maximise working life. Shade applied material from strong sunlight. If possible, avoid extreme temperatures by working at night

Technical Data