world of asphalt pavements feedback sydney stephen emery
TRANSCRIPT
World of Asphalt Pavements Feedback
Sydney
Stephen Emery
Year 2000 'World of Asphalt Pavements' International
Conference
‘The Flexible Path for the 21st Century’
February 20-24, 2000 — Sydney, Australia
Session 1: Australasian Overview of World Issues
• Innovation in Specifications and
Contractual Arrangements - towards
performance contracting, Australia
Session 2A: Design Concepts
• Compass to design functional mixes,
Netherlands
• Design and vacuum creep on SMA,
Australia
Session 2B: Innovative Surfaces 1
• Microsurfacing for heavily trafficked
roads, Australia
Session 2C: Binders – Cold
• Emulsion Priming of Road Bases, Australia
Session 3A: Performance Testing
• Evaluation of field and laboratory
fatigue properties of asphalt mixes, Australia
Session 3B: Aggregate/Binder Properties
• Detecting and measuring segregation,
USA
Session 3C: Binders – Hot
• Specialty binders with improved fuel
resistance, Australia
Session 4: Working Together: achieving better & safer outcomes
• Keynote: Asphalt paving health
effects research and development in
the United States, Asphalt Institute, USA
Session 5: European Overview of World Issues
• Use of innovative contracts in Sweden
• LCI (Life Cycle Inventory) for asphalt in Green Procurement, Denmark
Session 6A: Innovative Surfaces 2
• Porous asphalt, NZ
• Stone mastic asphalt: performance
related material specification and
experience, NZ
Session 6B: Application Innovation
• MultiPaver - road maintenance, Australia
• Reduced thickness bitumen rubber
asphalt leads to cost effective
pavement rehabilitation, USA
Session 6C: Environmental Aspects
• Low noise asphalt concrete
containing tyre rubber, France
• Use of PG asphalt cement in recycled
Hot Mix, USA/Canada
Session 7A: Binder Specification/Development
• Australian Performance Based Binder Specifications
• Multi purpose (multigrade) high performance binder, Mobil
• Multibit–a new high performance (multigrade) bitumen, BP
Session 7B: Aggregate/Surface Texture
• Evaluation of Superpave fine aggregate specification, USA
• Aggregate suitability (stripping potential) for asphalt using methylene blue test, Australia
• Hardness testing of pavement surfaces, NZ
• Comparison of methods to measure road surface macrotexture, NZ
Session 7C: Costing/Statistical Control
• Asphalt Mixture Proportioning: Mix
Design and Production Compared, USA
Session 8: Performance Outcomes – more than just a
good idea
• Partnering in Road Construction, RSA
• Simple Performance Test - AASHTO
2002 Design Guide, USA
Session 9: North American Overview of World Issues
• Innovations in Materials and Mix Design
• Developments in Specifications and Contract
• Construction Equipment Developments,
• HMA Work Force Issues for the 21st Century
Session 10: An International Potpourri
• Australian Asphalt Mix Design Procedure, Australia
• Experience with thin and ultra-thin HMA pavements in the United States, USA
Australian Asphalt Mix Design Procedure
Gyratory compaction is used in designFlexural modulus, not resilient modulusCreep slope is sensitive to air voids; not
good assessment of rutting. Wheel-tracking test to be used in future.
Rutting controlled byAir voids of 2.5% at refusal density
(350 gyrations)Wheel tracking results
Session 11: Southern African Overview of World Issues
• Procurement protocol for modified binders
• New hotmix design method for southern Africa
• Development of a product certification system
• Pavement performance evaluation as input to stochastic asset management
Session 12: Progress along the World Highway of the 21st
Century
• Technological developments under long term road maintenance, Australia
• Implications of long term road maintenance contracts for the asphalt industry, South Africa
Closure
• Opportunity to benchmark South Africa internationally
• We saw that South African issues parallel world issues– we are living in a global society
• Next WOAP conference– Jointly with CAPSA?– 2004?– Held in South Africa?