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Abstract—In New Zealand the Austroads Pavement Design Guide is used to design pavement rehabilitation treatments. Often a range of designs are possible which theoretically give the same design life as the only design check is cover or strain at the subgrade soil level. Often the lowest cost treatment is chosen which is stabilisation with 1.5% cement as the check on the subgrade strain (i.e. pavement depth) shows it will meet the 25 year design life. Authors: Dr Greg Arnold and Anthony Stubbs

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A laboratory derived, asphalt performance criteria has been accepted for use in the pavement design of a New Zealand State Highway road for the first time. An alternative asphalt fatigue performance criterion was researched, tested and applied to the Memorial Park Alliance. This paper illustrates an example of how research can drive efficiency. Authors: Anthony Stubbs, Road Science, NZ. Dr. Greg Arnold, Road Science, NZ. John Vercoe, Road Science, NZ. Dave Gedney, URS & Memorial Park Alliance, NZ. Dr. John Donbavand, NZ Transport Agency, NZ Date: November 2014

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Pavements at intersections often show shoved and rutted asphalt. A main reason for this is the static and slow loading on the asphalt while heavy vehicles stop at limit lines and traffic lights. Traditional asphalt becomes very soft under static loads and for this reason aircraft stopping areas are often concrete slabs rather than asphalt.

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PowerPoint presentation showing process of RLTT Beam Polymer Asphalt Design.

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Presentation about NZ moisture detection monitoring.

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The benefits of using bitumen emulsion over hotcut cutback bitumen are social, technical and environmental, this paper explores the topic of new generation bitumen emulsions. Author: Phillip Muir

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What is a Bitumen Emulsion? A bitumen emulsion is a suspension of bitumen droplets in water which reduces viscosity to enable spraying at low temperatures.

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Bitumen emulsions have been used successfully in New Zealand roadworks since early 1900’s, offering a safer, more sustainable alternative to hot cutback bitumen. Their warm application reduces health and environmental risks, eliminates hazardous solvents, and significantly lowers emissions. With proven durability, better workability, and strong industry backing, including from Waka Kotahi NZ Transport Agency, the shift to emulsions is no longer just innovative — it’s essential for modern, responsible road maintenance. Road Science has been advocates for this transition for years based on robust technical evidence and industry-wide support. This document provides an overview of all frequently asked questions in relation to Road Science emulsion products used for chip seal projects.