Performance-based specifications Work Package 5

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Performance-based specificationsWork Package 5

• Modelling of permanent deformation in unbound
  granular and bituminous materials

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Partners in Work Package 5

• Danish Road Institute, DRI, DK
• (subcontractor Asfaltindustrien),
  AI, DK
• Laboratoire Central des Pont et Chaussées, LCPC,
  F
• Instituto Superior Tèchnico, IST, P
• Institut für Strassenbau und Strassenunterhaltung,
  Technishes Universität, Wien, ISTU, A
• Shell Global Solutions S.A., SHELL, F
• Transport Research Laboratory, TRL, UK

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Key personal in Work Package 5

• Erik Nielsen, DRI/AI, leader of WP and task 5.1
• Pierre Hornych, LCPC, leader of task 5.2
• Absamad El Abd, LCPC
• Antonio Gomez Correia, IST
• Sandra M. R. Ferreira, IST
• Ronald Blab, ISTU, leader of task 5.3
• Barbara Gagliano, ISTU
• Karl Franz Kappl, ISTU
• Michael Wistuba, ISTU, liason to COST 347
• Richard C. Koole, SHELL
• Laurent Porot, SHELL
• Cliff Nicholls, TRL

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Objectives

• prepare and facilitate the production of a new
  set of performance-based specifications for
  pavement materials
• focus on permanent deformation in unbound
  granular and bituminous layers
• assess and develop predictive models for
  permanent deformation
• make the models independent on the nature of the
  materials (both traditional and alternative)

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Tasks defined to reach the objectives

• Task 5.1 collect a database of well-docu-mented
  real loading tests (RLT) and accele-rated loading
  tests (ALT) to fit the need of other activities
  in Work Package 5
• (this task is clearly a supportive activity to
  facilitate the calibration and validation of the
  main objective of Work Package 5)

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Tasks defined to reach the objective

• Main activity is to assess and develop models of
  predictive nature together with associated test
  protocols to provide the necessary input for the
  models describing permanent defor-mation.
• Task 5.2 concerns unbound granular materials
• Task 5.3 concerns bituminous materials

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Achievements so far in the project

• Two reports (Deliverable D10 and D11) for
  unbound granular and bituminous materials
  respectively describe the assessment /
  development of the possible candidate models and
  associated test methods needed to model permanent
  deformation of the material in question.
• The reports have been through a review process
  and are now approved for publication on the
  public part of the SAMARIS project website.

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Achievements so far in the project

• The reports divide the models in two levels
• Routine level models which include mixed models
  combining empirical and visco-elastic-plastic
  models
• Advanced level models have - compared to
  routine levels models - increased complexity
  and have higher demands on the input parameters
  (Subsequently these models will be used for
  larger projects)
• You could argue that in complexity research level
  models were the highest level with stringent
  requirements for amount and degree of detail in
  input parameters, but this level is considered
  outside the scope of SAMARIS.

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Routine level model candidates

• Unbound granular materials
• Empirical relationship for unbound materials
  (Gidel et al.)
• Bituminous materials
• Belgian Road Research Centre method for
  predicting the permanent deformation under
  simplified stress conditions
• Rutting prediction by Shell Pavement Design
  Manual
• Permanent deformation response SHRP level I

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Advanced level model candidates

• Unbound granular materials
• Incremental elasto-plastic models (Chazallon et
  al.)
• Bituminous materials
• Permanent deformation response SHRP level II
• The DBN model (Di Benedetto Neifar)
• The Asphalt Concrete Response (ACRe) model (S.
  Erkens)

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Data for the models

• A database report (Deliverable D6) describes the
  strategy for search for well-documented RLT/ALTs
  that can facilitate the next step in the work
  which is calibration and validation of selected
  models from the initial work (Deliverables
  D10/D11).
• The report tries to explain how some of the
  constraints or requirements from the models to
  the input data have influenced the selection of
  RLT/ALTs.
• This report has been through a review process and
  is approved for publication on the public part of
  the SAMARIS project website.

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Origin of selected data
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Extra laboratory works

• Both for unbound granular and bituminous
  materials extra information or more detailed
  input is needed
• Laboratory works are in progress in order to
  provide this additional information

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Extra laboratory works(unbound granular
materials)

• LCPC and IST have planned a test programme which
  includes
• common part for both laboratories
• loading for resilient behaviour
• loading for multi-stages permanent deformation
  tests
• loading for single-stage permanent deformation
  tests
• complimentary test programme for IST
• 1 loading for resilient behaviour
• 2 loading for multi-stages permanent deformation
  tests
• 1 loading for single-stage permanent deformation
  test
• complimentary test programme for LCPC
• 4 monotonic triaxial shear test and
• then at two different water content
• 1 loading for resilient behaviour
• 3 loading for multi-stages permanent deformation
  tests

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Extra laboratory works(bituminous materials)

• Laboratory plan for material samples for LAVOC

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Extra laboratory works(bituminous materials)

• Large scale Wheel Tracking with Danish Asphalt
  Rut Tester
• When all the ALT testing for other projects are
  finished at LAVOC a detailed assessment can be
  made for sampling large pavement slabs for Danish
  Asphalt Rut Tester (will it be possible to cut
  representative, virgin samples for the pavement
  at LAVOC ? )
• Planning of bituminous test pavement with
  alternative materials (incorporated in both
  surface layer and binder course) has started and
  a potential site has been chosen. Length of
  pavement and number of samples for Danish Asphalt
  Rut Tester will depend on the outcome from LAVOC.
• Production of test pavement is expected in last
  part of August 2004 and apart from samples for
  Danish Asphalt Rut Tester additional tests will
  be planned (e.g. comparison between some of the
  different equipments for wheel tracking test in
  accordance with EN 12697-22).

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Extra laboratory works

• Unbound granular materials
• LCPC and IST have estimated that approx. 25 of
  their laboratory activity on the unbound
  materials.
• Bituminous materials
• Samples for small size tests will be cut and
  distributed from ISTU this month for laboratories
  at SHELL and TRL.
• The majority of laboratory work is expected to be
  finished before the end of this year.

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Calibration and validation

• The second part of the SAMARIS project with
  respect to Work Package 5 is the
• calibration and
• validation of selected models
• When the models are verified, WP 5 will be able
  to give recommendations for a new set of
  performance-based specification.

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Work Package 5 Gantt chart