Parex LA Repair Concrete

• Conforms to the requirements of EN 1504-3 R4 classification, and the following repair methods:
  • 3.2 Concrete restoration - Recasting with concrete or mortar.
  • 4.4 Structural strengthening – Adding mortar or concrete.
  • 5.3 Increasing physical resistance – Adding mortar or concrete.
  • 6.3 Resistance to chemicals – Adding mortar or concrete.
  • 7.1 Preserving or restoring passivity – Increasing cover with additional mortar or concrete.
  • 7.2 Preserving or restoring passivity – Replacing contaminated or carbonated concrete.

• Complies with the requirements of Design Manual for Roads and Bridges CS 462 Repair and management of deteriorated concrete highway structures (formerly BA 35/90 and BA 52/94). 

• Satisfies the requirements of Document: 9-514929-RP-0002: Area 9 Contract P25 - M6 Gravelly Hill Viaduct Concrete Repairs and Cathodic Protection Replacement (often termed 'Midlands Link Specification'). 

Portland cement, selected aggregates and additives.

12 Months

Store properly in original unopened, sealed and undamaged packaging in dry and cool conditions.

D_max: 4.0 mm

<0.003%

~5.7 kΩ·cm

Euroclass A1                                                                               (EN 1504-3 cl. 5.5)

20mm minimum / 500mm maximum

Flowing concrete

+5°C minimum / +30°C maximum

3.25 litres (13% by mass) per 25kg bag

+5°C minimum / +30°C maximum

This depends on the substrate roughness and thickness of layer applied. As a guide, one 25kg bag yields approximately 12.5 litres of concrete.

• Refer to recommendations provided in EN 1504-10.
• Avoid application in direct sun and / or strong wind and / or rain.
• Pour from one side only when using shutters / formwork.
• Do not use vibrating pokers.
• Do not add water over recommended dosage.
• Apply only to sound, prepared substrates.
• Do not add additional water during the surface finishing as this will cause discoloration and cracking.
• Protect freshly applied material from freezing.
• If pumping (recommended for large volume placement):

1. Ensure suitable equipment is used (e.g. Putzmeister SP 11 TMR with a 4-cylinder diesel engine). NOTE: Not all Putzmeister SP 11 models have the same power! 
2. Lubricate / prime all hoses with a cement slurry ('double cream' consistency) immediately prior to use.
3. Attach hoses one at a time after priming (pump Parex LA Repair Concrete to the end of each section before attaching a subsequent primed hose). 

NOTE: Always conduct equipment trials to confirm the product can be pumped satisfactorily before full project application. 

Place the required quantity of water into a suitable forced action mixer such as a Creteangle. Slowly add the powder to the water whilst continuously mixing. After all the powder is added, mix for a further minute to ensure a smooth lump-free consistency is achieved.

Ensure sufficient Parex LA Repair Concrete has been mixed and available so the placing operation can be carried out in one continuous pour. Place from one side of the formwork / shuttering until the area is full. When placing through a flexible tube to the bottom of the section, pour slowly and continuously to displace air upwards within the work piece. For cold weather working, consider using warm water to assist with achieving strength gain and other physical properties.

At temperatures between +5°C and +35°C, formwork should be left in place until the compressive strength of the Parex LA Repair Concrete has reached at least 10 N/mm². Once the formwork has been struck, any exposed concrete should be cured immediately to ensure full cement hydration and minimise cracking. Use polythene sheeting taped down at edges or other approved method. In cold ambient conditions protect recently placed concrete from freezing.

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be mechanically removed.