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You searched in: Activity management

1

Category: Activity management

Research Report 558 Epoxy modified bitumen chip seals

Published: Oct 2014
  • Also known as: 558
  • ISBN: ISBN: 978-0-478-41983-2
  • Author: Opus International Consultants Ltd

The research investigated aspects of the use of epoxy modified bitumen for construction of chip seals. Changes in the shear modulus, needle penetration and cohesive energy of the epoxy bitumen were used to monitor changes in the material as it cured at 35℃ and 45℃ and after accelerated ageing at 85℃ for 177 days. Wheel-tracking tests were used to determine the ability of the material to...

2

Category: Activity management

Research Report 555 Optimising drainage maintenance for pavement performance

Published: Sep 2014
  • Reference: 555
  • ISBN: 978-0-478-41974-0
  • Author: J Patrick and H Arampamoorthy, Opus Research | G Arnold, Road Science

This project was designed to investigate the importance of drainage maintenance for pavement performance and to recommend a maintenance strategy. With restrained funding for pavement renewals drainage maintenance is a cost-effective method to ensure optimum pavement performance.

A combination of repeated load triaxial testing and modelling of water movement has shown that once...

3

Category: Activity management

Research Report 547 Fatigue design criteria for road bridges in New Zealand

Published: 30 Jun 2014
  • Reference: 547
  • ISBN: 978-0-478-41936-8 (electronic)
  • Author: MJ Beamish, Beca Ltd

Road bridges are subjected to millions of cycles of heavy vehicle loading over their design lives, and the introduction of higher vehicle mass limits on New Zealand roads will significantly increase the rates of fatigue damage in bridge superstructures. The NZ Transport Agency's Bridge Manual has relied on British and Australian standards for fatigue design criteria, and the aim of this...

4

Category: Activity management

Research Report 543 Pavement design for specialist surfacings

Published: Jan 2014
  • Reference: 543
  • ISBN: 978-0-478-41905-4
  • Author: G Arnold, A Stubbs and J Vercoe - Road Science

Leutner shear tests to measure bond strength and flexural beam tests to measure flexibility were conducted on specialist surfacing resins used in New Zealand for coloured and high-friction surfacings. The flexural beam tests found the specialist surfacing resins, except for one, to be very flexible at 5 and 20 degree test temperatures. This flexibility showed that the specialist surfacing resins...

5

Category: Activity management

Research Report 525 Steel-concrete composite bridge design guide

Published: Sep 2013
  • ISBN: 978-0-478-40769-3
  • Author: HERA | SCI | AECOM

This report provides guidance on the design of steel-concrete composite bridges, which consist of steel girders and reinforced concrete slabs on top. Two common forms are considered: multi-girder and ladder deck bridges. Guidance is given on the general considerations for the preliminary and detailed design process, in addition to guidance on the verification of structural adequacy in...

6

Category: Activity management

Research Report 528 Improvement of visual road condition data

Published: Jun 2013
  • Reference: 528
  • ISBN: 978-0-478-40761-7
  • Author: MSP Tapper, Beca, Tauranga | TFP Henning, University of Auckland | KD Dunn, Beca, Tauranga

The objective of this research, which was carried out between 2010 and 2012, was to investigate the effectiveness of the current road condition rating system with a view to improving the accuracy and confidence in the data collected. This in turn will build confidence in key network performance indicators.

The use of visual road condition rating data in New Zealand has evolved from...

  • Reference: 529
  • ISBN: 978-0-478-40766-2
  • Author: TFP Henning, University of Auckland | SB Costello, University of Auckland | M Tapper, Beca, Tauranga

The NZTA has been using performance indicator analysis and levels of service reporting for some years to assist with funding allocation, monitoring the application of funds and ensuring these are spent appropriately. Undertaking performance reporting assists in the funding decision process by utilising:

- trend monitoring to show the network ‘health’ of an authority

  • 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: 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: 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...

11

Category: Activity management

Research Report 498 The design of stabilised pavements in New Zealand

Published: Feb 2013
  • 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...

14

Category: Activity management

Research Report 499 Modelling of extreme traffic loading effects

Published: Oct 2012
  • 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...

15

Category: Activity management

Research Report 491 Factors influencing the decision to rehabilitate a pavement

Published: Jun 2012
  • 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...

17

Category: Activity management

Research Report 463 Development of tensile fatigue criteria for bound materials

Published: Jan 2012
  • 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...

18

Category: Activity management

Research report 470 Selection of aggregates for skid resistance

Published: Jan 2012
  • 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: 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...

20

Category: Activity management

Research report 466 High-stress corners

Published: Dec 2011
  • 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...

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