Machine placed (slip formed or extruded) concrete: Grade S32, minimum cementitious content of the concrete is 320 kg/m3 for all roads.
Surface finish: A mortar surfacing is required on extruded work and a comparable finish required for other placing methods.
Placing and curing: The provisions of S200 Concrete Work Clause 6.0 do not apply. Provide kerbs and channels with no cracks greater than 0.3 mm wide (other than at control joints) and without impairment of slip resistance.
Excavation limit: When excavating the existing pavement to construct the kerb and channel, limit excavation to the minimum required for a mechanical compactor and kerb machine. Excavate at least 75 mm past the back of the kerb.
Pre-wetting: Wet the bedding material immediately before laying concrete without resulting in free water remaining on the surface.
Bedding. Construct bedding from the same pavement material or approved free draining non-plastic material with permeability not less than the adjoining pavement material. Continue pavement at least 75 mm past the extremities of the kerb to ensure stability of the pavement edge. Extend bedding to the bottom of the pavement box, but the minimum bedding thickness must not be less than 75 mm.
