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COST 347Improvements in Pavement Research with Accelerated Load Testing

European Union Action COST 347

Improvements in Pavement Researchwith Accelerated Load Testing

Andrew Dawson(Nottingham Center for Pavement Engineering)

Vice-chairman

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Overall Objective is to ....

develop a European code of good practiceto optimise the use of ALT facilitiesto improve the application of their resultsto improve the efficiency & quality of ALT useto make research results available and useable

to the benefit of owners of ALT facilities to the benefit non-owner organisations

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Structure ..... 1/2

1 InventoryCharacteristics, Instrumentation, Pavement condition

evaluation

2 Previous and current research in the field of ALTMaterials, ALT, Performance models, Pavement design, Socio-

economic considerations

3 ALT versus RLT

4 Common code of good practiceExisting facilities & Future facilities

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Structure ..... 2/2

5 Future use of ALTAlternative and new materialsNew measurement techniquesMaintenance worksEnvironmental issues

6 Dissemination

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COST 347Improvements 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

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COST 347Improvements 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

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COST 347Improvements in Pavement Research with Accelerated Load Testing

following on from PARIS

11 countries provided:720 test sections

615 flexible105 semi-rigid

4 countries provided:196 sections available for detailed study

165 flexible31 semi-rigid

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COST 347Improvements in Pavement Research with Accelerated Load Testing

in 1995

Running costs:RLT = 2 million Euro / annumALT = 1.5 million Euro / annum (8 countries)

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COST 347Improvements in Pavement Research with Accelerated Load Testing

RLT - benefits

Economic

Real (!)rate of loadingtrafficclimatesubgrade

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COST 347Improvements 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 possibleNon-severe deterioration only

Uncontrolledclimatic effects (temperature, moisture ... )traffic irregularities

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Analysis

Analysis differs for ALT / RLT / AST

CrackingS-curve response in ALT ... logistic modelRLT early response affected by agingRLT response stops earlyso linear model for middle distress

traffic / time

Ruttinglinear (or power) for RLTlinear for ALT unless greater

rut depths

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Specific ALT & AST contributions … 1/2

comparing alternatives novel materialsenvironmentally desirability

recycled components surface noise generation of surface wear debris clogging of porous surfacings

maintenance techniques

supporting legislative decisions on traffice.g. 115kN axle in Accession Countries

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Specific ALT & AST contributions … 2/2

supporting asset managementunderstanding initiation of distressderiving distress propagation modelsdefining key performance indicatorsdefining performance based specifications

studying surface sign wear

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COST 347Improvements in Pavement Research with Accelerated Load Testing

COST347’s input

COST 347 will propose how best to address theseusing ALT and AST (alongside RLT)using best historic approachesby defining future best-practicetargetted to the present issues listed above

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COST 347Improvements in Pavement Research with Accelerated Load Testing

Find out more !

Visit

www.pave-test.org

Home to COST347 and A2B09