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Durability test method for bitumen

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

Test method to assess the long-term field durability (resistance to oxidative hardening) of NZTA M1 penetration grade bitumens.

P25 Pilot specification for calcined bauxite

Published: | Category: Skid resistance & texture , Surfacing , Specifications | Audience: Roading contractors

The NZ Transport Agency has released a pilot version of the P25 Specification for calcined bauxite for trial and comment. This is a performance-based specification for calcined bauxite applied with non-bituminous binder on an appropriate substrate. The expectation is that the surfacing (including the substrate) will have a life of 6 to 8 years with zero or minimal maintenance. This specification applies where the substrate is provided by the principal or the contractor.

Improvement of macro-texture by use of high pressure water and grooving

Published: | Category: Skid resistance & texture , Surfacing , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

This specification and guidance notes set out requirements for improving the macrotexture (texture) of a pavement surface using high-pressure water or grooving treatments.

A prioritisation scheme for the safety management of curves

Published: | Category: Skid resistance & texture , Surfacing , Specifications | Audience: General

This paper is for skid resistance practitioners to assist them with background to the T10 policy on curves.

Texture by the sand circle method measurements

Published: | Category: Skid resistance & texture , Surfacing , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

This test procedure covers the determination of the average texture depth of a paved surface using sand to give the volume of voids. The method is suitable for the measurement of surfaces with average texture depths greater than 0. 45 mm (less than 350 mm sand circle diameter).

Skid resistance investigation and treatment selection

Published: | Category: Skid resistance & texture , Surfacing , Specifications | Audience: Road traffic engineers & consultants

This specification (2013) and guidance notes outline the process for identifying sites where treatment to improve skid resistance may be justified and the process to be followed. In addition, previous versions of the T10 specification (1997, 1998, 1999, 2002, 2010, 2012) and notes (1997, 1998, 1999, 2002 and 2012) are listed as historical references. The 2013 specification includes prioritisation process for both investigation and programming of treatments at the exception report stage and once seasonally corrected data is available. These provide for optimum use of funds rather than setting a standard that may not be able to be achieved. In T10 2013 table 3 Minimum macrotexture requirements has been updated and a new section on the strategy for treatment of unstable chipseals has been included.

Roading bitumens

Published: | Category: Materials , Surfacing , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

This specification and guidance notes set out the physical characteristics required to be met by all bitumen used in New Zealand. All of the products supplied as grades listed in table 1 require approval by the NZ Transport Agency, which includes the approval of a quality assurance plan for the manufacture and supply of an M/1 approved bitumen. Although only 5 grades are listed in Table 1, to avoid presenting an obstacle to innovation note 1 to the table specifically allows other grades (eg ‘multigrade’ bitumens) to be used if approved by the Operations Manager, NZ Transport Agency National Office. Approvals are for a period of 5 years after which time resubmission is required.
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