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#20-06 State Highway Construction Contract Proforma Manual (SM031) Issue 16

Published: | Category: Technical advice note | Audiences: Road traffic engineers & consultants, Roading contractors

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.

#20-05 Contract Procedures Manual (SM021)

Published: | Category: Technical advice note | Audiences: Road traffic engineers & consultants, Roading contractors

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.  

#20-07 State Highway Maintenance Contract Proforma Manual (SM032) Issue 11

Published: | Category: Technical advice note | Audiences: Road traffic engineers & consultants, Roading contractors

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.  

#20-08 Use of GAP65 as a drainage medium to retaining and geotechnical structures

Published: | Category: Technical advice note | Audiences: Road traffic engineers & consultants, Roading contractors

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.

#20-09 Use of sonic drilling in ground investigations

Published: | Category: Technical advice note | Audiences: Road traffic engineers & consultants, Roading contractors

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.

Quantitative Extraction of Bitumen from Asphalt Mixes

Published: | Category: Materials , Surfacing , Testing , Specifications | Audience: Roading contractors

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

Quality assurance level contracts

Published: | Category: Construction , Maintenance , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

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.

Vegetation control

Published: | Category: Vegetation , Maintenance , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

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

Christchurch Southern Motorway – environmental, urban design and landscape masterplan

Published: | Category: Urban design , Planning, design, funding, building, maintenance of the transport network , Guidance for specialists | Audiences: Road traffic engineers & consultants, Roading contractors

The Environmental, urban design and landscape masterplan for the Christchurch Southern Motorway brings together a range of disciplines including: landscape architecture, urban design, architecture, art, ecology, various design engineering disciplines, planning and roading contractors. The Christchurch Southern Motorway occupies a mixed greenfield and brownfield sites that will connect urban with peri-urban and rural areas. The masterplan vision is developed through appraisals, workshops, consultation and creative thinking to provide an over-arching direction for the Christchurch Southern Motorway.

Research Report 574 Geosynthetics in basecourse stablisation

Published: | Category: Activity management , Research programme , Research & reports | Audiences: Road controlling authorities, Road traffic engineers & consultants, Roading contractors

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.