Subject to the provisions for alternative reinstatement materials (ARMs) and alternative technologies (ATs) in A9, an undertaker may adopt an alternative specification for materials and/or the installation process to take advantage of new or local materials and alternative compaction equipment, subject to the agreement of the authority. Agreement from the authority must not be unreasonably withheld (see A9, There can be no departure from the performance requirements during the guarantee period.
Recycled or primary materials, or any combination thereof, are permitted by this Code provided they meet the performance requirements and any compositional requirements for the relevant material layer.
Bound materials are permitted for use as surround to apparatus and at backfill and sub-base layers provided they meet the relevant performance requirements of this Code (see S4). This includes an upper limit on strength.