WORK PACKAGE 5

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WORK PACKAGE 5

• FUTURE USE OF ALT

Andrew Dawson United Kingdom Jürgen
Hothan Germany Matti Huhtala Finland Leena
Korkiala-Tanttu Finland Andreas
Loizos Greece Niclas Odermatt Sweden Paulo
Pereira Portugal Wei Zhang Jacobsen Denmark Per
Ullidtz Denmark
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PRESENTATION

• Seven research areas of interest for this study
• Delivery of WP 5
• Problems to be solved, conclusions and
  recommendations

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SEVEN RESEARCH AREAS OF INTEREST

• Alternative and new road construction materials
• New techniques for monitoring
• How maintenance works can be investigated as part
  of ALT
• How to evaluate pavement environment related
  issues
• Pavement design methods and models
• Effect of vehicle variables on pavement
  performance
• How to deal with collaborative techniques,
  collaborative partnerships, harmonisation,
  reliability of results and scale factors

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DELIVERY OF WORK PACKAGE 5

• A catalogue of new pavement research topics where
  ALT could be used today and in the future was
  developed in Wp 5

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IDEA COLLECTION

• Brainstorming Session
• Information from other work packageswithin COST
  347
• Information from other sources
• Compile the information together with new ideas
  from WP 5 members

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CONCLUSIONS AND RECOMMENDATIONS

• As today, one of the main future purposes of ALT
  Provide accelerated evaluation of pavement
  performance
• ALT, a link between laboratory tests and
  Real-time Load Testing
• ALT, a fixed part of the acceptance testing
  procedure
• ALT as an element in a series of test methods at
  different levels in a pavement research program

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RESEARCH INTO ALTERNATIVE AND NEWROAD
CONSTRUCTION MATERIALS
Pavement designer and owner problems

• Satisfactory performance?? Gain experience of
  in-situ behaviour? Evaluate the key engineering
  properties in-situ? Determine the optimum
  mixture proportions? Determine the optimum mode
  or position of application
• Any problems using the material, like pollutions
  from the material to the surroundings, etc?

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RESEARCH INTO ALTERNATIVE AND NEWROAD
CONSTRUCTION MATERIALS

• In this research topic there can be a large
  contribution from ALT? ALT has an important
  role in defining the adequacy of a wide range of
  novel materials which currently fall outside the
  limits of experience of use
• ? ALT will help users to define the best means
  of using such materials
• ? Acceptance testing using ALT

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RESEARCH INTO ALTERNATIVE AND NEWROAD
CONSTRUCTION MATERIALS

• ALT is well suited to address some of the needs.
  The ability to be able to assess the behaviour of
  a new and a conventional material is a key
  strength of ALT? Response under
  trafficking - ALT is very suitable? Long-term
  behaviour - ALT as an assessment? Ageing of
  materials - ALT is not that suitable ? Easy to
  place and compact - No direct use of ALT
  (performance)? Bonding to existing pavement
  materials - ALT can be suitable? In-situ
  material properties - ALT is very
  suitable? Determine the optimum mixture
  proportion - ALT can be suitable ? Determine
  the optimum mode or position of application
  - ALT can be suitable ? Pollution from the
  alternative material of the surrounding
  environment - ALT not always best

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NEW TECHNIQUES - INSTRUMENTATION

• ? ALT instrumentation requires
  re-consideration. Different applications of ALT
  requires different instrumentation and/or
  deployment? Consideration should be given to
  collect data in a responsive manner and not only
  to some pre-defined schedule ? Smart
  instrumentation, capable of producing
  outputs which depend on input condition, and
  involving more than one sensor, needs to be
  developed

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NEW TECHNIQUES - INSTRUMENTATION

• ? Wireless data collection, data storage and
  data access issues all need addressing
• ? More comparative testing between instruments
  needed
• ? Investigation and determination of
  best-practice for instrumentation installation
  needed
• New techniques are important to ? Increase the
  efficiency and quality in ALT work ? Obtain
  reliable results ? Cause minimal disturbance in
  the material ? Save money on ALT work in the
  long run

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INVESTIGATION OF MAINTENANCE WORKS
Road owner problems

• Satisfactory performance?? Gain experience of
  in-situ behaviour? Evaluate the key engineering
  properties in-situ? Evaluate alternative
  maintenance strategies

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INVESTIGATION OF MAINTENANCE WORKS

• In this research topic there can be a large
  contribution from ALT
• ALT has a significant capability for assessing
  thesuitability of different pavement
  rehabilitations, repair anddeterioration-preventi
  on strategies? Response under trafficking - ALT
  is very suitable? Long-term behaviour - ALT as
  an assessment? Easy to place and compact - No
  direct use of ALT (performance)? Bonding to
  existing pavement layer - ALT can be
  suitable? In-situ material properties - ALT is
  very suitable? Climate effects (seasonal
  frost, high temp, precipitation) - ALT can be
  used, some cases

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EVALUATION OF PAVEMENTENVIRONMENT RELATED ISSUES
Road owner problems

• Pavements impact on the environment? Pollutions
  (leaching to ground, dust and particles to
  air, vehicle emissions, etc)? Noise, vibrations
  and visual impacts, etc
• The environments impact on the pavement? Water
  (precipitation and movements in pavement)? High
  and low temperatures? Frost-thaw, etc

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EVALUATION OF PAVEMENTENVIRONMENT RELATED ISSUES

• In this research topic there can be a
  contribution from ALT in some specific areas
  ? ALT will seldom be most suited for studies of
  the impact of the pavement on the environment?
  Despite this generalisation, tyre and pavement
  surface wear issues could be studied with ALT

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EVALUATION OF PAVEMENTENVIRONMENT RELATED ISSUES

• ? Water spray effects might also be studied in
  some higher speed ALT equipments? Despite ALT
  having limited applicability in aiding study of
  the pavements impact on the environment,
  the reverse is likely to be a prime ALT
  capability

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PAVEMENT DESIGN
Pavement designer problem

• Be able to estimate design life of a pavement and
  the deterioration process (design and performance
  models)
• Be able to define design parameters
• To get acceptance for designprocedures or design
  assumptions
• Estimation of failure mechanism
• Assess calculation methods

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PAVEMENT DESIGN

• In this research topic there can be a large
  contribution from ALT ? ALT continues to
  offer benefits to pavement design? Design
  methods, material models, failure
  mechanisms, loading effects and time-related
  effects (healing, etc.) are all assessable

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EFFECT OF VEHICLE VARIABLES ONPAVEMENT
PERFORMANCE
Road owner problem

• Be able to know how
• ? Different load levels ? Type of tyres ?
  Tyre pressures ? Suspensions ? Rest periods ?
  Speed ? Dynamic loads ? etc
• influence pavement performance

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EFFECT OF VEHICLE VARIABLESON PAVEMENT
PERFORMANCE

• In this research topic therecan be a large
  contributionfrom ALT
• ALT continous to contributeregarding the effect
  of differentvehicle variables on
  pavementperformance

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OTHER FACTORS

• ? There is a need for collaboration between
  different ALT owners and between different ALT
  funders ? This will open up the possibility
  of repeatability and reproducibility studies,
  speed of loading studies and of a greater range
  of material properties / pavement types /
  loading regimes
• ? Harmonisation of test procedures and analyses
  of test results are important

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OTHER FACTORS

• ? Studies of the relationships of different
  scale factors have to be performed more in the
  future
• ? There is no immediate need for more
  European ALT facilities, but rather a need for
  stronger co- operation among the existing
  facilities to complement each other

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Tekn. Lic. Niclas OdermattSwedish National Road
AdministrationE-mail niclas.odermatt_at_vv.seTel
46 243 757 69