world of asphalt pavements feedback sydney stephen emery

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?