6th International DUT Workshop on Fundamental Modelling of Design and Performance of Concrete Paveme

1
6th International DUT Workshop on Fundamental
Modelling of Design and Performance of Concrete
Pavements
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History

• 1st International Workshop
• Epen,
• The Netherlands,
• 5-6 June 1986
• 31 participants
• 29 papers

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History
2nd International Workshop Sigüenza, Spain, 4-5
October 1990 37 participants 36 papers
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History
3rd International Workshop Krumbach, Austria, 29
-30 September 1994 49 participants 39 papers
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History
4th International Workshop Buçaco, Portugal, 10-1
1 September 1998 33 participants 36 papers
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History
5th International Workshop Istanbul, Turkey, 1-2
April 2004 33 participants 25 papers
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History
6th International Workshop Priorij Corsendonk,
Old-Turnhout Belgium, 15-16 September 2006 31
participants 23 papers
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6th International Workshop - Overview
Participants from 10 countries 3 Belgium 2 Japan
1 Denmark 1 Taiwan 2 Germany 6 The
Netherlands 2 South Africa 2 Sweden 1 Spain 11 USA

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6th International Workshop - Overview
Keynote speech Main themes I Fundamental
modelling of material properties II Theoretical
models for concrete pavements III Theoretical
models related to pavement performance IV Theoret
ical design of innovative pavement structures
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6th International Workshop -Keynote speech

• Prof. dr.ir. F. van Cauwelaert (Belgium)
• Title
• A bit of fifty years pavement engineering
• From practice to theory and why not from theory
  back to practice.

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6th International Workshop Theme IFundamental
modelling of material properties

• 6 papers
• Main topics
• early age behaviour of concrete (the Netherlands,
  USA)
• fatigue behaviour of (lean) concrete (Belgium,
  Sweden, USA)

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6th International Workshop - Theme IFundamental
modelling of material properties
Conclusions of Theme I

• Sophisticated mathematical tools and laboratory
  equipment are available for in-depth analysis of
  early age behaviour of concrete (critical phase)
• Tendency for (in-situ or laboratory) fatigue
  testing of full-scale slabs instead of laboratory
  testing of beams,
• Measured fatigue resistance is specimen property,
  not a material property

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6th International Workshop - Theme
IITheoretical models for concrete pavements
6 papers All papers dealt with different aspect
of structural design of concrete pavements

• curling of corners (USA)
• dowel misalignment (USA)
• concrete overlay on asphalt pavement (Belgium)
• reinforcement of CRCP (the Netherlands)
• probabilistic (Germany)
• equivalency method for pavement analysis (USA)

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6th International Workshop - Theme
IITheoretical models for concrete pavements
Conclusions of Theme II In analytical design of
concrete pavements emphasis on

• details such as reinforcement
• Material-related matters (variation in concrete
  strength, built in curling)
• Construction-related matters (variation in
  concrete thickness, misalignment of dowels)

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6th International Workshop - Theme
IIITheoretical models related to pavement
performance
9 papers Main topics Effect early age behaviour
of concrete on pavement performance
(USA) Application of modern mathematical
techniques (Taiwan, USA) Pavement performance as
affected by special loadings, gap/voids below
slab, variation and uncertainty (Belgium/the
Netherlands, Japan, USA)
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6th International Workshop - Theme
IIITheoretical models related to pavement
performance

• Conclusions of Theme III
• in USA much attention for early age concrete
  pavement behaviour (curling is built-in-damage)
• substantial attention for in-depth analyses of
  special cases, such as extreme (aircraft)
  loadings and lack of support
• modern mathematical tools, such as ANN, will
  improve quality of pavement evaluations and
  pavement performance predictions
• attention to pavement performance variability

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6th International Workshop - Theme
IVTheoretical design of innovative pavement
structures
2 papers both addressing HRUTWT (Heavily
Reinforced Ultra Thin White Topping)

• general aspects and application on orthotropic
  steel deck bridge (Denmark/the Netherlands)
• modelling, APT testing and field applications for
  roads (South Africa)

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6th International WorkshopConclusions

• Excellent papers describing exciting developments
• Specialised technical papers have high value for
  practice
• Results can and must be implemented in practice
• However too often our clients seem to be
  hostile, they dont want to listen, know and
  accept technical matters
• Road Authorities interested in road user related
  matters (traffic capacity, safety, noise, air
  pollution) and contractual matters (contracts,
  money, warrantee, risks) and are not technically
  quality driven

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6th International WorkshopConclusions

• Platform needed to present the practical
  implications of technical work to upper road
  management (client, contractor)
• Topics
• money
• risks
• contracts
• good practice / examples

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• THANK YOU