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3/10/13
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MASTER CLASS IN FLEXIBLE PAVEMENTS
Brisbane 26th September 2013
MASTER CLASS –
FUNDAMENTALS OF PAVEMENT DESIGN
FACILITATOR: Geoff Youdale AM
Position: Consultant Organisation: AAPA
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Objectives Scrutinise Australian flexible pavement research initiatives in the light of the experience of the international experts
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Objectives Scrutinise Australian flexible pavement research initiatives in the light of the experience of the international experts Obtain guidance on the directions of Australian flexible pavement research
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Strategies Make the most of the generous contribution of time and intellect provided by our visiting experts
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Strategies Make the most of the generous contribution of time and intellect provided by our visiting experts Review current overseas research findings on key issues driving improvements in flexible pavement design, construction and performance
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Strategies Build and strengthen alliances with international research agencies with the goal of sharing research effort to mutual benefit
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Strategies Build and strengthen alliances with international research agencies with the goal of sharing research effort to mutual benefit Ensure broad dissemination of the state of the art among Australian pavement practitioners
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Achievable Benefits
Increased durability of asphalt pavements with enhanced design reliability Improved sustainability and reduced
environmental impact of asphalt pavements Reduced life cycle costs for stakeholder benefit Reduced community disturbance
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Rules of Engagement Presenters assume participants are familiar with concepts from pre-reading Presenters are asked to identify key issues within their area of expertise – Issues where there is confidence – Issues yet to be fully resolved
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Summary of 2011 Master Class Outcomes
The principles of Long Life Asphalt Pavements are firmly established globally.
The means of structural design, including materials characterisation and transfer functions are available but require harmonisation to suit local conditions.
Software can be readily developed to align with currently used Austroads methodology.
Strong links were forged with overseas experts in this field.
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Issues for 2013 Master Class § Materials Characterisation
§ Validation against field measurements
§ Developing Modeling Parameters § Setting Performance Criteria
§ Implementation
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcome (Hopefully!)
Greater understanding of issues facing the design and performance of flexible pavements.
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Outcome (Hopefully!)
Greater understanding of issues facing the design and performance of flexible pavements. Critical review of the progress in achieving improved Australian flexible pavement design procedures.
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2013 Master Class Attendees
§ Road agencies § Materials suppliers § Contractors § Consultants § Academics § Researchers
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From material fundamentals to field modeling of performance
Key material characteristics impacting
on pavement performance Martin van de Ven
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MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Materials Characterisation
– Sample selection and preparation 28 production mixes from all over Australia characterised
(14 x AC14: 14 x AC20 Binders: C 320; C 450; C 600; A15E; Multigrade)
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Materials Characterisation
– Sample selection and preparation 28 production mixes from all over Australia characterised (14
x AC14: 14 x AC20 Binders: C 320; C 450; C 600; A15E; Multigrade)
– Dynamic modulus testing Dynamic modulus test preferred as it characterises material over the full
range of temperature and loading conditions Compatible with overseas practice
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Materials Characterisation
– Sample selection and preparation 28 production mixes from all over Australia characterised
(14 x AC14: 14 x AC20 Binders: C 320; C 450; C 600; A15E; Multigrade)
– Dynamic modulus testing Dynamic modulus test preferred as it characterises material over the full
range of temperature and loading conditions Compatible with overseas practice
– Development of Dynamic Modulus Master Curves Master curves have been developed but need to be recalculated to take into
confining stresses to better model behaviour at high temperatures. A database of Master Curves has been developed that can be utilised for
input to pavement design and can be expanded for new materials
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MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Materials Characterisation (cont’d)
– Relationships between Dynamic, Resilient and Beam moduli Relationships have been developed Enables existing data to be utilised for design and simpler tests to be used
for quality control during construction
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Validation against field measurements
– Relationship between Dynamic Modulus and Field Modulus Strong relationship established between laboratory dynamic modulus values
and field values of modulus back calculated from FWD testing. Provides confidence that laboratory test results accurately reflect field values
– Validation of strain prediction Strains predicted from linear elastic analysis correlate strongly with field
measurements of strain Provides confidence that mechanistic analysis results accurately reflect field
performance
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Outcomes from 2013 Master Class Developing of Modeling Parameters
– Facilitation of modeling of multi-layered pavements A technique for calculating an equivalent modulus to represent a multi-
layered asphalt pavement has been developed and trialed Temperature modeling techniques are in the early stages of development in
collaboration with ARRB
MASTER CLASS IN FLEXIBLE PAVEMENTS
MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class Developing of Modeling Parameters
– Facilitation of modeling of multi-layered pavements A technique for calculating an equivalent modulus to represent a multi-
layered asphalt pavement has been developed and trialed Temperature modeling techniques are in the early stages of development in
collaboration with ARRB
Setting Performance Criteria – Setting limiting strain criteria to ensure long life
Development of cumulative strain criteria using NCAT performance data is being examined.
The compatibility of this with yield strain values from other studies also needs to be considered (such as the French risk allocation techniques)
Need to examine European practice regarding autogenous healing
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MASTER CLASS IN FLEXIBLE PAVEMENTS
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Outcomes from 2013 Master Class
Implementation – Determining the optimum means of implementation
Need to get agreement of design methodology from stakeholders Opportunity for national agreement.
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MASTER CLASS IN FLEXIBLE PAVEMENTS
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Costly Side Effects
COMPLETION CONCEPTION PRODUCT KNOWLEDGE
Complex Ambiguous Results
New Surprising Interesting
Effective Economic Reliable Practical