Colas HSC6

Colas HSC6 is a single pre-mixed cement based non-shrink concrete suitable for thick section placing where rapid early strength gain is required.

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Colas HSC6 may be used for the support of road ironwork and highway furniture, barriers and stanchion posts. The mixed concrete, when placed, will harden in approximately 10 minutes. The compressive strength gain will reach 20N/mm² within 2 hours allowing early opening of roads to vehicular traffic.

The self-contained product only needs to be mixed with water on site and the rapid setting assists the re-bedding of road ironwork and the setting in of new systems.

The product is chloride free and can be safely used with cast iron and steel units.

The concrete can be placed in sections of 20 to 200mm. Greater thicknesses can be built up in layers. After placement no special curing is required in moderate ambient conditions.

Where to use?

  • Installation of road ironwork.
  • Support of road furniture.
  • Placing of stanchion posts.
  • Roadway rapid repairs.


Laitance and all loose material including dust, oil and grease should be removed in order to produce a sound substrate. The work area should be pre-wetted taking care to remove any standing water before placing the Colas HSC6.


To achieve the most consistent concrete mix, mechanical mixing is recommended. If hand mixing care should be taken to ensure that the mix is fully wetted out without the use of excess water. Mechanical mixing may be carried out in a suitable vessel using a slow speed high torque drill and Concrete Stirrer. Thorough hand mixing may be carried out using a clean spot board or wheelbarrow. Each 25kg bag of Colas HSC6 requires 2.5 to 3.0 litres of water to give a medium workability concrete consistency. Excess water should not be added. Once setting of the concrete has commenced, further mixing should not be used to re-work the mix. The concrete should be placed within approximately 10 minutes of mixing. The working time may be extended in cold ambient conditions and may be slightly shortened in hot ambient conditions.

Mixed Colas HSC6 should be placed onto the dampened prepared surface as soon as mixing is complete. Once placed fully compact the concrete to obtain maximum strength development. The bed thickness applied in a single application should be between 20 to 200mm. Thicker support beds can be achieved by applying further material as soon as the lower bed has hardened sufficiently not to distort under the additional work. The placed concrete will have hardened sufficiently to carry out further work within 20 minutes depending on the surrounding ambient conditions and the grade being applied.

Curing: No special curing is required at temperatures between 5°C and 35°C. For placing at temperatures outside this range contact the Technical Service Department.


The volume yield of each 25kg bag/tub of Colas HSC6 is approximately 12 litres.


Colas HSC6 is supplied in 25kg bags (50 x 25kg bags per pallet) and 25kg buckets (40 x 25kg per pallet).


Colas HSC6 will have a shelf life of 6 months when kept unopened, clear of the ground, in dry conditions, protected from excessive draught, between temperatures of 5°C and 35°C. Storage at higher temperatures and high humidity may reduce the shelf life.


Colas HSC6 has been tested in accordance with appropriate pats of EN 12390.


Variations in water content and ambient temperature for particular applications may alter concrete consistency and compressive strength achieved.


For full safety information, please request the Colas HSC6 Safety Data Sheet 123 using the contact information on this webpage.