澳大利亚路面技术进展.pdfVIP

Current and future developments in asphalt technology Erik Denneman For presentation at AAPA and QTMR Workshop 5 April 2013, Eagle Farm Structure of short presentation • Conventional asphalt mix design • Current directions in asphalt technology • Current Austroads related work – Improved design procedures for asphalt pavements – High modulus asphalt – Maximising the re-use of Reclaimed Asphalt Pavement 2 .au Trusted advisor to road authorities for technical input and solutions Conventional mix design • Differs per road authority, bot nationally and internationally but typically: – Focus on volumetrics and specification of components (grading, binder) • Advantages: – Straightforward – Decades of experience – Fairly reliable determination of optimum binder content  Disadvantages: – No direct link to pavement design methods – Empirical, reactive specifications 3 .au Trusted advisor to road authorities for technical input and solutions Directions in asphalt technology • Strong international trend towards performance related design • Concept of performance specifications: – Evaluate mix properties based on field loading conditions (climate, traffic) relevant to site. – Describe required performance, rather than prescribing mix composition. – Testing mostly mix and binder type blind. – Simplification: fewer, but more reliable tests, only one test per performance parameter. – Reduces barriers to innovation and promotes efficient use of natural resources, without sacrificing performance. 4 .au Trusted advisor to road authorities for technical input and solutions Directions in asphalt technology • SUPERPAVE in the US – Pe