1. n° 1 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

2. n° 2 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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. n° 3 COST 347 Improvements in Pavement Research with Accelerated Load Testing Secondary Objectives enable cost-sharing / co-operative research ventures (public / private) facilitate their setting-up improve the possibilities for non-owners to make use of existing ALT facilities. provide for co-operation with pavement research in the USA and elsewhere

4. n° 4 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

5. n° 5 COST 347 Improvements in Pavement Research with Accelerated Load Testing Structure..... 2/2 5 Future use of ALT Alternative and new materials New measurement techniques Maintenance works Environmental issues 6 Dissemination

6. n° 6 COST 347 Improvements in Pavement Research with Accelerated Load Testing Austria Belgium Switzerland Czech Republic Denmark Spain Germany France Finland Greece Hungary Iceland the Netherlands Romania Sweden Slovenia United Kingdom

7. n° 7 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

8. n° 8 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

9. n° 9 COST 347 Improvements in Pavement Research with Accelerated Load Testing in 1995 Running costs: RLT = 2 million Euro / annum ALT = 1.5 million Euro / annum (8 countries)

10. n° 10 COST 347 Improvements in Pavement Research with Accelerated Load Testing RLT - benefits Economic Real (!) rate of loading traffic climate subgrade

11. n° 11 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

12. n° 12 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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 distress traffic / time Rutting linear (or power) for RLT linear for ALT unless greater rut depths

13. n° 13 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

14. n° 14 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

15. n° 15 COST 347 Improvements in Pavement Research with Accelerated Load Testing 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

16. n° 16 COST 347 Improvements in Pavement Research with Accelerated Load Testing Find out more ! Visit www.pave-test.org Home to COST347 and A2B09