Resources

The objective of this project was to develop and test an apparatus and procedure for determining natural frequency and damping ratio for heavy vehicle suspension systems. A test has been developed that involves supporting an axle group on collapsible…

A new mix design system for porous asphalt based on maximising the effective void content, but maintaining sufficient strength through the use of polymer-modified bitumen, was developed and trialled.

The measurement of traffic volumes on an extensive nationwide network is a very large task.

This report describes a New Zealand study of the effect of different binders on the rate of chipseal texture loss under traffic.

The road transport industry in New Zealand has been lobbying for increases in the allowable mass limits for heavy vehicles on the basis that this would give increased efficiency and benefits to the economy.

This report details the progress made in tests in Oklahoma, USA ,and Christchurch, New Zealand, during the period August 2004 to June 2005, exploring digital imaging technology to measure chipseal surface texture.

To improve the efficiency of the road transport industry, a range of mass limit increases for heavy vehicles has been proposed.

The accumulation of chipseal layers following repeated road resurfacing frequently results in an unstable surface that can flush quickly, sometimes within twelve months.

Accelerated pavement testing at CAPTIF (Canterbury Accelerated Pavement Testing Indoor Facility, Christchurch, New Zealand) was conducted between 2000 and 2004 on a standard two-coat chipseal that is typically used on New Zealand roads.

Rut depths are permanent deformations of the pavement structure, and an important indicator of the structural integrity of the pavement as well as having an impact on road user safety.