Resources

This note is to advise that issue 16 of the Waka Kotahi NZ Transport Agency State Highway Construction Contract Proforma Manual (SM031) has been released to be used for all future procurement of infrastructure projects and is available for download from the Waka Kotahi website.

This note is to advise that the third edition of the Waka Kotahi NZ Transport Agency Contract Procedures Manual (SM021) has been released to be used for all future procurement of infrastructure projects and is available for download from the Waka Kotahi website.  

This note is to advise that issue 11 of the Waka Kotahi NZ Transport Agency State Highway Maintenance Contract Proforma Manual (SM032) has been released to be used for all future procurement of infrastructure projects and is available for download from the Waka Kotahi website.  

This note is to advise that there is an issue with the use of GAP65 as a drainage material and, as a result, this material must not be used unless its suitability for the works as designed is demonstrated. The new requirement applies from the date of this notice.

This note is to advise that there is an issue with the use of sonic drilling as an investigation technique in the North Island and, as a result, this methodology must not be used unless its suitability for the works as designed is agreed with the road controlling authority. The new requirement applies from the date of this notice.

Test method to determine the bitumen content of asphalt mixes for the purposes of assessing compliance with specified requirements.

Q/3 Normal QA level contract specification covers the quality assurance requirements for contracts which have been assessed at the normal quality assurance level. Q/4 High QA level contract covers the quality assurance requirements for contracts which have been assessed at the high quality assurance level. Both specifications should be applied to all contracts on state highways which involve road construction, road maintenance, and structures. The guideline notes covers the roles of the client, consultant and contractor in the application of quality assurance provisions in roading contracts.

This specification sets out the requirements and standards for the control of roadside vegetation on state highways.

The application of geosynthetics (ie geogrids) for the stabilisation of basecourses prepared with a River Run rounded gravel aggregate was investigated. Reductions in the rate of rut formation by over 50% were observed when geogrids were included either at the basecourse/sub-base interface or at half-height of the basecourse. The rate of rut formation was reduced further if a square type geogrid was used in place of a triaxial type geogrid. It was found that the basecourse rutted rapidly if the surface was not confined, due to the lack of particle interlock and surface confining stress. If the surface was confined with a thin (ie < 40mm) asphalt layer to bind together the particles in the surface, then the aggregate provided significant support and reduced rutting by over 90%, even without the addition of geosynthetic stabilisation.