Resources & manuals

• Reference: 508
• ISBN: 978-0-478-40705-1
• Author: NZ Transport Agency, Opus Central Laboratories

This research project had the objective of identifying areas where changes could be made in the use of thin layers of asphalt so that improvements in performance could be obtained. The project was not designed to investigate quality issues, but was to concentrate on materials and selection. The project was initiated because Transit New Zealand (now the NZ Transport Agency) had found that costs of...

• Reference: 523
• ISBN: 978-0-478-40748-8
• Author: University of Auckland, Clearway Consulting Ltd

This research investigated the effect of road roughness, macrotexture and testing speed on GripTester measurements.

Field tests were conducted by the GripTester at various test speeds on sites with varying road roughness in South Auckland. The variables – road roughness, texture and test speeds – were measured and plotted against each other along with grip number (GN)...

• Reference: 502
• ISBN: 978-0-478-39495-5
• Author: University of Auckland

Precast pre-tensioned concrete bridge construction became common in New Zealand in the 1950s and a large number of pre-tensioned concrete bridges were constructed between 1953 and 1980. These bridges do not meet today’s durability requirements and many are at risk of chloride-induced pre-tensioned reinforcement corrosion. This deterioration can be difficult to detect in visual inspections...

• Reference: 498
• ISBN: 978-0-478- 39487-0
• Author: NZ Transport Agency, Opus International Consultants Ltd, Universidad del Desarrollo, Santiago

Areas of New Zealand are running out of premium aggregates that meet the demanding specifications used in unbound granular road construction. Stabilising aggregate provides a viable alternative to using premium aggregates.

The objective of this project was to improve the sustainability of New Zealand roads via a combination of Accelerated Pavement Tests at the Canterbury Accelerated...

• Reference: 504
• ISBN: 978-0-478-40700-6
• Author: University of Auckland

Bridge damage, especially due to pounding and unseating at expansion joints has been observed in almost all major earthquakes. It is the result of large relative displacements of girders, in excess of the designed gap width and seating length. Research shows that relative displacements of neighbouring bridge segments depend on the fundamental frequencies of the adjacent structures, spatially...

• Reference: 501
• ISBN: 978-0-478-39494-8
• Author: University of Auckland

The design of concrete beams for shear loading is governed in New Zealand by the provisions of NZS 3101. The shear design provisions of NZS 3101 impose two limits on the permissible design shear capacity, including a maximum shear capacity of 8MPa. This 8MPa limit influences the efficiency of concrete beam design, and in particular the design of concrete bridge beams that have concrete...

• Reference: 499
• ISBN: 978-0-478-39488-7
• Author: Opus Central Laboratories

In New Zealand, premature failure of low volume, low strength state highways and local authority roads has sometimes occurred due to significant changes in heavy commercial vehicle traffic. Current New Zealand pavement deterioration models (eg NZ-dTIMS and HDM) were not designed to simulate these sudden increases in traffic loading and their effects over short distances.

The...

• Reference: 491
• ISBN: ISBN 978-0-478-39461-0 (electronic)
• Author: Opus Central Laboratories

The objective of this research, undertaken in 2008-2011, was the development of an improved method of modelling the decision to rehabilitate a typical New Zealand thin-surfaced unbound granular pavement. This was driven by previous research that had found a poor correlation between the recorded data and the decision to rehabilitate. It had been hoped that by talking to local engineers and...

• Reference: 475
• ISBN: ISBN 978-0-478-39414-6 (print); ISBN 978-0-478-39413-9 (electronic)
• Author: Opus International Consultants Ltd, University of Auckland

This research was undertaken between July 2008 and May 2011 and brings together findings from a review of literature and a survey of New Zealand bridge asset management practices. The review and the survey identified that the type of data that is collected for bridges have to be improved if advanced bridge asset management is to be adopted. Also, techniques of data collection have to change to...

• Reference: 470
• ISBN: ISBN 978-0-478-39400-9 (print); ISBN 978-0-478-38099-6 (electronic)
• Author: Opus Central Laboratories, Statistics Research Associates Limited

Statistical modelling was undertaken to develop a means for reliably predicting the expected in-service skid resistance of any rural section of the New Zealand state highway network surfaced with chip seal.

The measure of slow-speed skid resistance used was the sideways-force coefficient routine inspection machine (SCRIM) coefficients averaged over a 10m length. The statistical...

• Reference: 463
• ISBN: ISBN 978-0-478-38075-0 (print) ISBN 978-0-479-38074-3 (electronic)
• Author: Dr Greg Arnold - Pavespec Ltd, Clarence Morkel, Gerhard van der Westhuizen - New Zealand Institute of Highway Technology

Flexural beam breakage and fatigue tests were conducted in 2008-2011 to determine their relationships with pavement fatigue life and tensile strain for a range of New Zealand materials for use in pavement design of stabilised aggregates. The results showed that the tensile fatigue relationships from several fatigue tests under repetitive loading could be approximated by single flexural beam...

• Reference: 461
• ISBN: ISBN 978-0-478-38071-2 (print); ISBN 978-0-478-38070-5 (electronic)
• Author: Fulton Hogan Ltd, Opus International Consultants Ltd, Tonkin & Taylor Limited, Hiway Stabilizers NZ Ltd

The stabilisation of near-surface granular pavement materials is accepted practice in transportation maintenance and capital development projects in Australasia. Stabilisation in this context involves the mechanical introduction of reactive agents, including cement and foamed bitumen, into existing or manufactured granular materials, with or without existing seal inclusion.

Present-day...

• Reference: 466
• ISBN: ISBN 978-0-478-38088-0 (print); ISBN 978-0-478-38087-3 (electronic)
• Author: Opus Central Laboratories

A programme of research was undertaken to better understand chip loss on curves with the aim to improve chipseal design and selection practices. The research involved on-road measurements and computer simulation of tyre forces during cornering manoeuvres; correlation analysis using road surface, road geometry and traffic variables contained in the NZ Transport Agency's RAMM database; and...

• Reference: 460
• ISBN: ISBN 978-0-478-38068-2 (print); ISBN 978-0-478-38067-5 (electronic)
• Author: Opus International Consultants Ltd

Research was undertaken in 2009-2011 to evaluate the potential benefits of multigrade bitumens in chipsealing in New Zealand. A field trial demonstrated that multigrade bitumen seals could be constructed without significant modifications to existing practice except that higher spraying temperatures are required and adhesion agent choice is limited. Experimental measurements of...

• Reference: 459
• ISBN: ISBN 978-0-478-38064-4 (print); ISBN 978-0-478-38063-7 (electronic)
• Author: Tonkin & Taylor Limited

Premature distress in unbound basecourses has occurred regularly in New Zealand. In 2008, the New Zealand Transport Agency (NZTA) commissioned the assembly of an inventory of problem basecourses and subbases. Study of the inventory found that the long-term degree of saturation of basecourse was highly significant in the case histories of premature distress, ie the pavements failed through...

• Reference: 455
• ISBN: ISBN 978-0-478-38053-8 (print); ISBN 978-0-478-38052-1 (electronic)
• Author: E Fletcher and AJ Theron, MWH New Zealand Ltd, Hamilton

The objective of this research, which was carried out between 2006 and 2007, was to propose methods to disseminate and incorporate local as well as international knowledge of OGPA performance into the current New Zealand asset management systems.

Compared with asphalt overlay practices in Europe and the UK, the current New Zealand maintenance practice of multiple OGPA overlays is not...

• Reference: 448
• ISBN: ISBN 978-0-478-38007-1 (electronic)
• Author: Steer Davies Gleave

This paper develops a methodology and evidence to enable the assessment of wider economic impacts of transport. Quantifying these wider economic impacts is important as they are likely to be non-trivial in magnitude and they are currently excluded from the current appraisal methods. The paper derives New Zealand-based values of key parameters on imperfect competition benefits, increased...

• Reference: 454
• ISBN: ISBN 978-0-478-38049-1 (print); ISBN 978-0-478-38048-4 (electronic)
• Author: ARRB Group, Opus International Consultants Ltd

Alkali silica reaction (ASR) has, until recently, been considered to present a low risk to concrete in the South Island of New Zealand. The discovery in 2006 of evidence of ASR and delayed ettringite formation (DEF) associated with extensive deterioration of precast piles on two South Island structures prompted further investigation to identify the extent and severity of ASR and DEF in other...

• Reference: 447
• ISBN: ISBN 978-0-478-38005-7 (electronic)
• Author: Opus Central Laboratories, University of Auckland

Research undertaken between 2007 and 2009 examined the influence of binder rise in reducing tyre–road friction of chipseal surfaces. The emphasis was on the most extreme form of binder rise when the binder is level or above the sealing chip resulting in the formation of a black, slick surface. This condition is referred to as flushing.

The research involved performing texture...

• Reference: 445
• ISBN: ISBN 978-0-478-38000-0 (electronic)
• Author: Fulton Hogan Ltd

Chipsealing is the predominant resurfacing used on the state highway network in New Zealand. An important component of chipseals is the sealing chip layer that is applied to protect the binder layer and provide surface texture and surface friction. There are a number of specifications written to ensure that the sealing chip used is the correct size and shape, and that it has the appropriate...