This is the material specified by the Highways Agency as the vital load bearing foundation in road construction, which is laid prior to the bituminous pavement.
Specification compliance and consistency are monitored regularly, from product import through to customer despatch.
Rock Based Type 1
This is Limestone or Granite graded material produced and supplied to Clause 803 of the specification for highway works.
Slag Based Type 1
Produced to comply with the same specification as Rock Based Type 1, this recycled product is sourced from the blast furnace process of steel production.
Opti-Blend™/Opti-Mix™ Type 1
Opti-Blend™ and Opti-Mix™ Sub-base is a Brett Aggregates recycled Type 1 product. It is made up of 100% recycled material and is fully compliant with the Specification of Highways Works, Clause 803. Opti-Blend™ provides a construction platform for further work to be carried out: trafficking and subsequent layers. It also aids the distribution of load-bearing forces throughout the full layer into the sub-grade. 100,000t of Opti-Blend™ was used exclusively as the sub-base on the A249 Iwade Sheppey Crossing Project.