For further information contact pavements@nzta.govt.nz
This specification and guidance notes sets out design, maintenance and performance requirements of the surfacing and unbound flexible pavement layers for the construction of new pavements and re-construction of existing pavements.
Structural design and construction of flexible unbound pavements (B3)
Published: 2011
Stabilisation of pavement layers has a long history in New Zealand. Stabilisation is becoming more common as increasing traffic volumes and higher axle load limits are driving the need for pavements that are more robust than traditional unbound pavements. Equally in areas where top quality aggregates are hard to justify/find – these processes can provide economically viable alternatives. This specification applies to the in-situ stabilisation of granular pavement layers to produce a bound sub-base layer using cement or a blend of cement and lime.
Specification for in-situ stabilisation of bound sub-base layers (B6)
Published: 2012
This specification applies to the manufacture and construction of plant mixed aggregates to produce grader or paver laid pavement layers using cement, lime, bitumen emulsion or foamed bitumen. This specification shall apply to the construction of modified sub-base or basecourse layers.
Specification for the manufacture and construction of plant mixed modified pavement layers (B7)
Published: 2012
This specification applies to the manufacture and construction of plant-mixed aggregates to produce grader or paver laid bound sub-base layers using cement.
Specification for the manufacture and construction of plant mixed bound sub-base pavement layers (B8)
Specification and guidance notes for the supply of aggregate by weight. These conditions apply when the supply of aggregate is a separate contract item and the quantity for payment purposes is specified as the loose volume in delivery trucks.
Supply of aggregate by weight (G2)
Published: 2025
M3 specification accompanying notes set out requirements for sub-base aggregate for use on state highways and other heavily trafficked roadways.
M3 is the reference or standard specification for sub-base aggregate for heavy duty use in flexible pavements.
This update to M3 provides for a range of material quality, or class, depending on pavement loadings. It also introduces a statistical process control approach for determining compliance with M3 particle size distribution requirements.
These notes provide guidance for engineers to aid in their decision to reject or accept a material proposed for use as basecourse or sub-bases used on state highways and other roadways constructed in accordance with TNZ B/3 Performance based specification for structural design and construction of flexible unbound pavements (provisional) (2000).
Unbound road base and sub-base aggregates evaluation (M22)
This test procedure covers the determination of the rebound deflection of a pavement under a standard wheel load and tyre pressure, with or without temperature measurements.
Benkelman beam deflection measurements (T1)
T19 specification sets out procedures for determining an optimised blend of aggregate and binders for the stabilisation of pavements.
Procedures for design and indirect tensile strength testing of modified and bound pavement materials (T19)
