June 2006 - Vol.13 No.1

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CONTENTS

  • Editorial
  • The Use of Accelerated Pavement Testing to Support the Introduction of Performance Based Specifications in Japan
  • Measuring Chip Seal Surface Texture with Digital Imagery
  • LTPP Study for Six Local Government Authorities In Southeast Queensland
  • Privatisation of Road Facilities
  • Traffic Operations in Europe: Summary of Young Engineers Tour 1


Editorial

Journa13 jun06.pdf
This first issue of the REAAA Journal for 2006 contains five papers.

Specifications and contract documents for pavement construction in Japan have been revised to take account of the move away from empirical pavement design procedures towards mechanistic, or structural, procedures. The introduction of performance-based specifications has led to an increase in the demand for full-scale accelerated pavement (APT) testing for both proof testing of proposed designs and the evaluation of new pavement materials and/or technologies. The Public Works Research Institute of Japan has recently commissioned a reciprocal (linear) APT device and updated its circular facility. This paper provides some background into the development of performance based specifications in Japan and presents details of its two APT facilities. The need for on-site testing may also increase as the trend toward performance-based specifications increases. The next step, therefore, should be the development of a mobile facility.

Surface texture is the single most important physical characteristic in the management of chip seal surfacings because it is directly related to skid resistance. The development of a method that allows road owners and contractors to enhance the accuracy, reproducibility, and speed of texture measurement task will therefore accrue a large number of benefits, not only to road managers but also to the community. The purpose of the research described in this paper from New Zealand was to evaluate whether a practical method of road surface texture measurement using digital image processing, incorporating information theory and fast Fourier transform analysis, could be developed. The results of trials in the USA and New Zealand clearly demonstrated that the merger of digital image processing and physical texture measurements was possible and had the potential to successfully replace the sand circle (sand patch) test currently used. It was also possible to standardise the experimental set-up and calibrate the software and hardware necessary to achieve a high correlation using non-linear regression analysis with a sorted sample population. It is also proposed that the results of this research could be extended beyond texture measurement to the characterisation of skid resistance.

This paper won the New Zealand Road Innovation Award 2005. The prize is awarded annually by Transit New Zealand and Works Infrastructure Ltd for most innovative paper.

The third paper describes a collaborative research and development project between Griffith University, SMEC Australia and six Local Government Authorities in Southeast Queensland. The main purpose of the project is to calibrate the pavement deterioration factors that are required by the HDM-III deterioration models that have been integrated within the SMEC pavement management system. This paper presents an overview of the research conducted to date, including the procedure for the selection of the Southeast Queensland long term pavement performance (LTPP) sites and the rationale behind the design of the site selection matrix. The pavement distress progression generated by the HDM-4 deterioration models will be compared with those predicted by the calibrated HDM-III models in the next phase of the study. Details of the modelling of pavement deterioration using HDM-III at two selected sites are also presented in this paper.

At the 4th meeting of the Heads of Road Authorities (HORA) held in Bangkok, Thailand, in June 2005, each participating country was invited to give a short presentation on their local experiences with the privatisation of road facilities and problems they were facing. This paper presents a summary of these presentations, including the types of schemes operating and problems associated with their use. Many countries expressed the hope that, through REAAA, all countries will benefit from an exchange of information between member countries as a means of improving their knowledge and experience in the privatisation of road facilities.

During October 2005, young professionals representing State Road Authorities in Australia and New Zealand toured several European countries to discuss and inspect the latest traffic management techniques and systems in these countries. The focus of the trip was the task of operating the road system and the initiatives that are being used to maximise the efficiency of the network. This paper presents a summary of the findings of the tour. It is suggested that a number of initiatives could be considered for adoption in the region if not already implemented. This paper is based on a report prepared for, and presented to, Austroads Council in March 2006.

The Editorial Panel continues to seek papers and technical notes for publication in the Journal. The membership of the Editorial Panel follows. REAAA members interested in submitting a paper should seek advice from the appropriate member(s) of the Editorial Panel. The Panel is striving to publish at least one paper from each Chapter or region each year.


Kieran Sharp 

Chairman REAAA Technical Committee


for the full journal, please download Pdf icon2.png here