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Parex LA Repair Concrete
LA Repair Concrete complies with the requirements of BS EN 1504-3 Class R4.
Parex LA Repair Concrete is a blend of special Portland cements, ground granulated blast furnace slag plus high quality continuously graded non ASR reactive aggregates. The product, when mixed with water, produces a homogenous concrete which will not segregate or bleed and has a dual shrinkage compensating system giving volume stability in both the plastic and hardened states. The mix has high flow characteristics and will not rapidly stiffen.
Parex LA Repair Concrete may be used for all concrete repairs wherever a flowing concrete is required. The product is easily mixed and placed under gravity or by pumping. The placed material is self compacting and will displace air from the repair area ensuring a strong bond between the placed material and the repair substrate.
The use of the Portland blast furnace type of cement gives a mix design with less than 3kg of equivalent sodium oxide per m3 thus minimising the risk of alkali aggregate reaction even in the parent concrete. In addition, the midrange resistivity enables cathodic protection to be undertaken in conjunction with Parex LA Repair Concrete.
Parex LA Concrete is suitable for the following repair methods as defined in BS EN 1504.
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.
Uses include:
- Motorway bridge repairs.
- Repairs to large structural concrete elements.
- Protection of corroded and damaged reinforced concrete.
- Refurbishment of soffits to bridge beams and crossheads.
- Grouting under baseplates.
Specification Outline
Concrete repairs and replacement shall be carried out using LA Repair Concrete as manufactured by Parex Ltd. The product must be stored, handled and used strictly in accordance with the manufacturer’s instructions.
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