About this Product
webercem pyrapatch is a prepacked product based on hydraulic cements with specially graded non-reactive aggregates. The product is polymer modified which, when mixed with clean water, produces a fast setting repair concrete, suitable for patch or full-depth repairs up to 2 m2. Typical patch repairs up to 100 mm depth and extended with aggregate for full depth repairs. Complies with Highways Agency Specification for Highway Works.
Features and Benefits
- 15 - 20 minute working time at 20°C
- Trafficable within 3 hours
- Shrinkage compensated
- Sulphate resistant
- Resistant to freeze/thaw action
- Can be used for winter work down to 5°C
- Contains non-reactive aggregates
- May be extended with non-reactive 10 mm granite aggregate for full depth repairs over 100 mm depth
- Excellent strength gain at low temperatures
- Self priming
- Good compatibility with parent concrete
- Requires only the addition of water
- Independently tested by NAMAS approved laboratory
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.
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.
Tel: (01525) 722100
Fax: (01525) 718988
Material Safety Datasheet
Declaration of Performance (DoP)
Preparation & Application
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 SA 21/2.
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 edge to achieve a minimum of 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 a saturated, surface-dry concrete substrate.
Use only freshly opened webercem pyrapatch bags and a clean, forced-action mixer such as a Creteangle or Mixal mixer. 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 15 - 20 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 2 litres of water per 25 kg bag. Gradually add the powder and mix for 3 minutes. Add up to 0·5 litres of additional water if required to achieve the desired consistency.
NB: do not exceed maximum water addition of 2.5 litres water per 25 kg bag. For repairs over 100 mm thick, bulk out the repair concrete with 10 mm single-sized crushed granite aggregate (25 kg of aggregate per 2 bag mix) and mix for 5 minutes to a uniform consistency.
Place the material in the dampened and prepared area. To ensure satisfactory bonding, place from one side to the other and work the material into the sides and bottom of the repair area.
The use of a stiff brush is recommended to work the webercem pyrapatch onto the predampened substrate to enhance the bond.
Screed and level up to existing concrete. Finish by float and texture as required to seal the surface edges and saw cuts.
webercem pyrapatch is designed to have a thixotropic consistency to reduce slump in a repair on a camber. Compact by tamping the surface with a float to fluidise the material.
Setting time at 20°C is approximately 25 - 30 minutes.
webercem pyrapatch 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.
Packaging, Health & Safety
webercem pyrapatch is supplied in 25 kg bags.
Coverage / Yield
Unbulked: yield per 25 kg webercem pyrapatch is approximately 12 litres. Bulked: yield per 50 kg webercem pyrapatch and 25 kg of aggregate is approximately 31 litres.
Storage and Shelf Life
When stored unopened in a dry place at temperatures above 5°C, shelf life is 6 months from date of manufacture.
Health and Safety
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.
Other products in the range
General-purpose, rapid-setting, cement-based bedding concrete
Shrinkage-compensated, rapid setting bedding mortar for the reinstament of road iron work and highway furniture
Polyester-based mortar for bedding and fixing manhole frames, kerb stones, airport lighting bases, ducting, drains and highway fixtures
Rapid strength-gain repair concrete for thin bonded pavement repairs