AAPA2013MC-08-Geoff-Youdale-Summary-and-conclusions · BDynamic modulus test preferred as it characterises material over the full range of temperature and loading conditions BCompatible

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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


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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


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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.



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Issues for 2013 Master Class §  Materials Characterisation

§  Validation against field measurements

§  Developing Modeling Parameters §  Setting Performance Criteria

§  Implementation



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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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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)



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–  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



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–  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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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



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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



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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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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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Costly Side Effects

COMPLETION CONCEPTION PRODUCT KNOWLEDGE

Complex Ambiguous Results

New Surprising Interesting

Effective Economic Reliable Practical

Documents

AAPA2013MC-08-Geoff-Youdale-Summary-and-conclusions · BDynamic modulus test preferred as it characterises material over the full range of temperature and loading conditions BCompatible