weber.cemmortar  

weber.cem mortar is a general purpose mortar for the repair of concrete, to both horizontal and vertical surfaces.

This product has been formulated to comply with the requirements of BS EN 1504-3:R4 mortar.

• Resistant to water penetration.
• Excellent adhesion.
• Faster strength development than ordinary sand-cement mortar
• Agrément approved as part of the weber.cem concrete repair system.

• Formulated to comply with the requirements of BS EN 1504-3: R4 mortar

Constraints
For deep repairs in excess of 100 mm, weber has other products available. Please consult the Technical Department.

Do not add water above quoted recommendations. Use only clean water; do not use water which has a dissolved salt content.

Do not place when substrate temperature is below 5°C or when ambient temperature is below 5°C. Protect from frost.

weber.cem mortar has greater chemical resistance to mild acid attack than normal sand/cement mixes, but in situations liable to chemical spillage weber.tec resin-based systems are more suitable. Please contact our Technical Department for details.

weber.cem mortar has greater chemical resistance to mild acid attack than normal sand/cement mixes, but in situations liable to chemical spillage the weber.tec resin based systems are more suitable. Please contact our Technical Department for details.

Concrete
Concrete substrates must be adequately prepared either by use of a suitable mechanical method such as scabbling, grit blasting, needle gunning, or other appropriate means.

Old concrete surfaces contaminated with oil or grease require suitable preparation, such as steam cleaning in conjunction with a suitable detergent. Care must be taken to ensure that the oil or grease is removed from the surface and not simply spread over a large area.

New concrete should be cured for at least 14 days using an approved curing technique e.g. polythene film. Spray-on curing membranes are unsuitable for use on substrates where weber.cem mixes are to be applied.

Where repairs are carried out, feather edging is not recommended; therefore, the perimeter of area to be repaired should be cut back to provide a square edge, minimum 10 mm.

Before application of weber.cem keycoat, the concrete should be thoroughly wetted but all surface water must be removed.

Steel
Steel reinforcement which has been exposed during preparation should be completely uncovered to the full circumference of the bar. Rust scale, corrosion products and other deposits shall be removed from reinforcement by grit blasting or other approved methods to achieve first quality to BS 7079-A1 (equivalent to Swedish Standard SA 2 1/2).

Steel cleaning shall include hidden faces at the back of bars and at intersections, and the bonding agent/holding primer applied immediately after. In many instances where chloride-induced corrosion is absent, and where grit blasting is not practical, wire brushing or other techniques may be acceptable to the engineer, provided that care is taken not to polish the surfaces of the rust on the steel. weber.cem keycoat bonding slurry
Mix in the ratio of 3 volumes of weber.cem keycoat to 1 volume of clean water. Slowly add powder to water mixing continuously to a smooth creamy consistency.

Apply the slurry by a stiff brush and scrub well in. The slurry must be tacky when applying weber.cem mortar.

In hot weather the slurry dries quickly and, therefore, it is advisable that weber.cem mortar is mixed ready for application before the bonding slurry is applied. lf weber.cem keycoat does dry, it must be removed mechanically and a further coat applied.

In certain circumstances, especially in warmer conditions, it is more appropriate to use an epoxy primer such as weber.tec EP bonding aid.

weber.cem mortar must be mixed in a forced-action mixer such as a Mixal or Creteangle.

Slowly add the contents of a 25 kg bag of weber.cem mortar to 2·5 litres of clean water until a uniform colour and consistency is attained.

When fully cured weber.cem keycoat and weber.cem mortar are stable to freeze thaw conditions but should not be applied when conditions are not suitable for good concreting practice.

Apply the mortar to the tacky weber.cem keycoat or weber.tec EP bonding aid, compact into position and finish with a steel float. For vertical or soffit repairs, carefully tamp the mortar into position in layers of about 10 - 12 mm, and allow to reach initial set before applying the next layers of weber.cem keycoat or weber.tec EP bonding aid and weber.cem mortar.

When replacing cover on steel reinforcement, the minimum cover should be 12 mm. However, where this is not practical, for long term reinforcement protection where low cover replacement is undertaken (this must be a minimum of 6 mm thickness), we would recommend that all repairs are overcoated with a protective coating appropriate for the service conditions: please contact weber's Technical Department. On small floor repairs, cut out the damaged concrete to ensure the repair is 'toed' into the surrounding concrete. It is recommended that the surrounding concrete is sealed with weber acrylic sealer, which is a low-viscosity insurface sealer, to reduce the problems of degradation of concrete adjacent to the repair. After carrying out vertical and soffit repairs, clean the surface, apply one coat of weber.cote primer to stabilise and then two coats of an anticarbonation coating such as weber.cote smooth or weber.cote EC.

Good curing is essential. Immediately after the finishing operation, spray with water and cover with closely-fitting polythene sheeting or spray with weber.cote primer and cover with close contact polythene sheet.

When stored unopened in a dry place at temperatures above 5°C, shelf life is 12 months from date of manufacture.

Contains cement (Contains chromium (VI). May produce an allergic reaction). Harmful by inhalation. Irritating to eyes and skin.
Keep out of the reach of children. In case of contact with eyes, rinse immediately with plenty of water and seek medical help. After contact with skin, wash immediately with plenty of soap and water.
Wear suitable protective clothing, gloves and eye/face protection.
For further information, please request the Material Safety Data Sheet for this product.

Weber's Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Technical helpline
Tel: (01525) 722110
Fax: (01525) 718988

Weber products are distributed throughout the UK through selected stockists and distributors. For UK sales enquiries and overseas projects, contact Weber's Sales office.

Sales office
Tel: (01525) 722100
Fax: (01525) 718988