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European Union Action COST 347 Improvements in Pavement Research with Accelerated Load Testing

European Union Action COST 347 Improvements in Pavement Research with Accelerated Load Testing. Andrew Dawson (Nottingham Center for Pavement Engineering) Vice-chairman. Overall Objective is to. develop a European code of good practice to optimise the use of ALT facilities

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European Union Action COST 347 Improvements in Pavement Research with Accelerated Load Testing

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  1. European Union ActionCOST 347Improvements in Pavement Researchwith Accelerated Load Testing Andrew Dawson(Nottingham Center for Pavement Engineering)Vice-chairman

  2. Overall Objective is to .... • develop a European code of good practice • to optimise the use of ALT facilities • to improve the application of their results • to improve the efficiency & quality of ALT use • to make research results available and useable • to the benefit of owners of ALT facilities • to the benefit non-owner organisations

  3. Structure ..... 1/2 1 Inventory Characteristics, Instrumentation, Pavement condition evaluation 2 Previous and current research in the field of ALT Materials, ALT, Performance models, Pavement design, Socio-economic considerations 3 ALT versus RLT 4 Common code of good practice Existing facilities & Future facilities

  4. Structure ..... 2/2 5 Future use of ALT Alternative and new materials New measurement techniques Maintenance works Environmental issues 6 Dissemination

  5. Austria Belgium Switzerland Czech Republic Denmark Spain Germany France Finland Greece Hungary Iceland the Netherlands Romania Sweden Slovenia United Kingdom

  6. APT, ALT, AST & RLT ! • APT = Accelerated Pavement Testing • ALT = Accelerated Load Testing • AST = Accelerated Scale Testing • RLT = Real-time Load Testing COST 347 is addressing each of these

  7. following on from PARIS • 11 countries provided:720 test sections • 615 flexible • 105 semi-rigid • 4 countries provided:196 sections available for detailed study • 165 flexible • 31 semi-rigid

  8. in 1995 • Running costs: • RLT = 2 million Euro / annum • ALT = 1.5 million Euro / annum (8 countries)

  9. RLT - benefits • Economic • Real (!) • rate of loading • traffic • climate • subgrade

  10. RLT - drawbacks • Slow to deliver results • Can be victims of political/funding changes • For reasons of safety: • Limited distress possible • Non-severe deterioration only • Uncontrolled • climatic effects (temperature, moisture ... ) • traffic irregularities

  11. distress traffic / time Analysis • Analysis differs for ALT / RLT / AST • Cracking • S-curve response in ALT ... logistic model • RLT early response affected by aging • RLT response stops early • so linear model for middle • Rutting • linear (or power) for RLT • linear for ALT unless greater rut depths

  12. Specific ALT & AST contributions … 1/2 • comparing alternatives • novel materials • environmentally desirability • recycled components • surface noise • generation of surface wear debris • clogging of porous surfacings • maintenance techniques • supporting legislative decisions on traffic • e.g. 115kN axle in Accession Countries

  13. Specific ALT & AST contributions … 2/2 • supporting asset management • understanding initiation of distress • deriving distress propagation models • defining key performance indicators • defining performance based specifications • studying surface sign wear

  14. COST347’s input • COST 347 will propose how best to address these • using ALT and AST (alongside RLT) • using best historic approaches • by defining future best-practice • targetted to the present issues listed above

  15. Find out more ! • Visit www.pave-test.org • Home to COST347 and A2B09

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