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?