A4 - Unbound Aggregates

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Aggregates used in road construction are specified using the BS EN Standards in combination with the Specification for Highway Works (SHW). This Topic page gives details of aggregates used in:

Drainage trenches (SHW Series 500)
Earthworks and capping (SHW Series 600)
Subbase (SHW Series 600).

Full details are given in:

Standard: BS EN 13242, Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction
BS Guidance: PD6682-6
Standard: BS EN 13285, Unbound mixtures - specification
Guidance: Notes for guidance to the SHW, Series NG600 and NG800

BS EN 13242 defines aggregates that can be used in unbound mixtures for capping layers and subbase. BS EN 13285 defines the grading of the unbound mixtures.