Description

Water based concrete curing compound Uses

• As a spray applied membrane to retain moisture in concrete for effective curing
• Suitable for all general concreting Of particular benefit for large area concrete surfaces, such

as airport runways, roads and bridgeworks

Advantages

• Improved curing of concrete, enhances hydration process and provides a more durable concrete
• Control of moisture loss improves surface quality, reducing permeability, minimizing surface cracking and

shrinkage.

• Fugitive colour provides visual guide during
• Also available in white pigmented
• Water based, therefore, non-
• Spray application reduces labour costs, therefore eliminates the need for alternative curing systems.

Standards compliance

Concure WB gives 75% or greater curing efficiency when tested to BS 7542 and complies with BS 8110 Part 1, clause 6.6.3(c), ASTM C309 and AASHTO M148 as Type 1D.

Description

Concure WB water based concrete curing compound is based on a low viscosity wax emulsion. It is supplied as a white emulsion which forms a clear film on drying.

When first applied to a fresh cementitious surface the emulsion breaks to form a continuous, non-penetrating white coating. This dries to form a continuous clear film which provides a barrier to moisture loss, ensuring more efficient cement hydration, improved durability and reduced shrinkage.

Concure WB is also available in a white pigmented version. It contains a white pigment based on titanium dioxide to meet specifications requiring such pigmentation for reduction of solar temperature gain.

Technical support

Fosroc offers a comprehensive technical support service to specifiers, end users and contractors. It is also able to offer on-site technical assistance, an AutoCAD facility and dedicated specification assistance in locations all over the world.

Instructions for use

Application

Concure WB white should be stirred before use to ensure even dispersal of the pigment.

Concure WB should be spray applied to the surface of fresh concrete. Application should begin as soon as the concrete is free from surface water. Do not apply if bleed water is forming, or is present on the concrete surface.

The spray nozzle should be held approximately 450 mm from the concrete surface and passed back and forth to ensure complete coverage. The fugitive white colour during application provides a guide to the area covered. Pump pressure should be maintained to give an even, fine spray.

After spraying, no further application of water or other material is necessary to ensure continued curing. The concrete surface should not be disturbed until it has sufficient strength to bear surface loads. The applied film should not be trafficked until it is fully dry, care should also be taken to ensure that the film is not subsequently broken.

Concure WB may be applied to the surface of newly hardened concrete immediately after demoulding. In such cases the concrete surface must be damp and not dry. Dry surfaces may prevent correct film formation and cause absorption of the Concure WB which may lead to staining and difficulty in later removal.

Equipment

Spray equipment such as knapsack or motorized sprayers which produce a fine mist without damaging the emulsion may be used for Concure WB. The suitability of equipment should be assessed by an application trial.

Equipment cleaning

Spray equipment should be cleaned immediately after use by flushing through with water. If spray nozzles become blocked with wax particles these may be easily cleared with white spirit.

Overcoating and removal

Concure WB must be removed from concrete surfaces prior to the application of a coating, this is necessary to ensure adequate bond of the coating material to the concrete substrate.

Concure WB will slowly be removed by physical abrasion in normal trafficking conditions or exposure to UV light. To ensure complete removal use high pressure steam, water jet or light sand blasting.

Concure WBÖ

Limitations

• Concure WB should not be continuously recirculated in high shear pumps in concrete train or similar

applications, as this may cause a breakdown of the emulsion before spraying. If continuous recirculation is necessary, the sprayer should be fitted with a low shear diaphragm pump

• Minimum application temperature 5°C

Estimating

Supply

Concure WB                   :     20 & 210 litre drums

Coverage

Concure WB                   :     3.5 – 5.0 m²/litre

Storage

Concure WB has a shelf life of 12 months minimum if kept in a dry store between 4ºC and 35ºC in the original, unopened containers. Freezing or prolonged exposure to direct heat or direct sunlight must also be avoided. Should the temperature of the product fall outside this range then the Fosroc Technical Service Department should be contacted for advice. Containers should be kept sealed and airtight to prevent loss of moisture by evaporation.

Precautions

Health & safety

Concure WB does not fall into the hazard classifications of current regulations (see notes 1 and 2 below). However, it should not be swallowed or allowed to come into contact with skin and eyes either in bulk or spray form. Suitable protective gloves and goggles should be worn. Splashes on the skin should be removed with water. In case of contact with eyes rinse immediately with plenty of water and seek medical advice. If swallowed seek medical attention immediately – do not induce vomiting.

For further information consult the Safety Data Sheet available for this product.

Fire

Concure WB is water based and non-flammable.

Cleaning and disposal

Spillages of Concure WB should be absorbed onto sand, earth or vermiculite and transferred to suitable containers. Remnants should be hosed down with large quantities of water.

The disposal of excess or waste material should be carried out in accordance with local legislation under the guidance of the local waste regulatory authority.