weber.cempyratop  

weber.cem pyratop is a prepacked hydraulic cement-based product with specially graded aggregates. It exhibits high early strength, is dimensionally stable and has excellent abrasion resistance.
When mixed with clean water weber.cem pyratop produces an early strength concrete suitable for thin bonded toppings or full depth repairs up to 15 m2. Complies with Highways Agency deck repairs specification.

Uses :

• Thin-bonded repairs25 mm to 75 mm depth
• Repairs to steps and joints
• Industrial floors or failed floor slabsBridge deck repairs
• High strength repairs to pavement concrete both thin bed and full depth
• Parking decks and ramps
• Loading bays
• Jetty decks and slipways to coastal areas
• Airport hardstandings

All concrete to be repaired should have a minimum characteristic strength of 25 N/mm2 and a bond strength of 1 N/mm2. Surface preparation method should be carefully chosen so as to minimise the risk of micro-cracking in the parent concrete thus affecting the bond with the repair. For full depth repairs all exposed reinforcement steel should be cleaned to Swedish Standard SA2 1/2.

Scabble or break out spalled area to a depth sufficient to remove all deteriorated concrete providing an even, open texture. Avoid micro cracking to the parent concrete.

It is essential that edges be cut square to a minimum depth of 10 mm and are lightly scabbled. Feather edging is not recommended. Further breaking out is required at the saw-cut edges to achieve a minimum 25 mm depth of repair.

Clean and remove all oil, grease, dirt and loose debris from the area to be repaired. Thoroughly wet the prepared surface with clean water for at least 30 minutes prior to the start of mixing. Remove surplus water to achieve saturated surface-dry concrete substrate.

Use only freshly opened weber.cem pyratop bags and a clean forced action mixer such as a Creteangle. The mixer capacity should be at least 30% greater than the quantity to be mixed.

Locate the mixer close to the area to be repaired. Working time at 20°C is approximately 30 minutes. At lower temperatures, working time is increased, so it is advisable to keep material warm and use warm water in cold weather conditions.

Charge the mixer with 1·85 litres of water followed by a gradual addition of weber.cem pyratop. Mix for 3 minutes.

An additional 0.1 litres of water may be added if necessary and mix for 5 minutes.

NB: do not exceed maximum water addition of 1·95 litres water per 25 kg bag.

For repairs over 75 mm thick, bulk out the repair concrete with 10 mm crushed granite aggregate (25 kg of aggregate per 3 bag mix) and mix for 5 minutes to a uniform consistency.

weber.cem pyratop may be trowelled or poured into the prepared area. The use of a stiff brush is recommended to work the material onto the pre-dampened substrate to enhance the bond.

Screed and level up to existing concrete. Finish by steel trowel to seal the surface edges, and saw cuts.

Setting time
Setting time at 20°C is approximately 45 minutes.

Winter working
Pyratop can be used down to 5°C provided cold weather working precautions are carried out.

For applications below 5°C please contact weber's Technical Services Department

Curing
Cure within 30 minutes of laying using an appropriate method such as wet hessian, polythene or a sprayed-on curing membrane.

Protect from frost.

Unbulked: yield per 25 kg weber.cem pyratop is approximately 12 litres.

Bulked: yield per 75 kg weber.cem pyratop and 25 kg of aggregate is approximately 45 litres.

Store in a cool, dry place above 5°C. Shelf life of unopened bags in correct storage conditions is at least 6 months.

Essentially not hazardous.
Not harmful during normal use.
After contact with skin, wash immediately with plenty of water.
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

Keep out of the reach of children. For further information, please request the Material Safety Data Sheet for this product.