world of asphalt pavements feedback sydney stephen emery
TRANSCRIPT
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World of Asphalt Pavements Feedback
Sydney
Stephen Emery
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Year 2000 'World of Asphalt Pavements' International
Conference
‘The Flexible Path for the 21st Century’
February 20-24, 2000 — Sydney, Australia
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Session 1: Australasian Overview of World Issues
• Innovation in Specifications and
Contractual Arrangements - towards
performance contracting, Australia
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Session 2A: Design Concepts
• Compass to design functional mixes,
Netherlands
• Design and vacuum creep on SMA,
Australia
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Session 2B: Innovative Surfaces 1
• Microsurfacing for heavily trafficked
roads, Australia
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Session 2C: Binders – Cold
• Emulsion Priming of Road Bases, Australia
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Session 3A: Performance Testing
• Evaluation of field and laboratory
fatigue properties of asphalt mixes, Australia
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Session 3B: Aggregate/Binder Properties
• Detecting and measuring segregation,
USA
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Session 3C: Binders – Hot
• Specialty binders with improved fuel
resistance, Australia
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Session 4: Working Together: achieving better & safer outcomes
• Keynote: Asphalt paving health
effects research and development in
the United States, Asphalt Institute, USA
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Session 5: European Overview of World Issues
• Use of innovative contracts in Sweden
• LCI (Life Cycle Inventory) for asphalt in Green Procurement, Denmark
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Session 6A: Innovative Surfaces 2
• Porous asphalt, NZ
• Stone mastic asphalt: performance
related material specification and
experience, NZ
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Session 6B: Application Innovation
• MultiPaver - road maintenance, Australia
• Reduced thickness bitumen rubber
asphalt leads to cost effective
pavement rehabilitation, USA
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Session 6C: Environmental Aspects
• Low noise asphalt concrete
containing tyre rubber, France
• Use of PG asphalt cement in recycled
Hot Mix, USA/Canada
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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
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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
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Session 7C: Costing/Statistical Control
• Asphalt Mixture Proportioning: Mix
Design and Production Compared, USA
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Session 8: Performance Outcomes – more than just a
good idea
• Partnering in Road Construction, RSA
• Simple Performance Test - AASHTO
2002 Design Guide, USA
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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
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Session 10: An International Potpourri
• Australian Asphalt Mix Design Procedure, Australia
• Experience with thin and ultra-thin HMA pavements in the United States, USA
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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
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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
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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
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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?
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