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Noise classification for tendering quiet asphalt wearing courses

Noise classification for tendering quiet asphalt wearing courses. Hans Bendtsen, Danish Road Directorate. International Partnership Meeting Washington January 26, 2012. The road administration noise challenge. Large focus on noise annoyance in the population

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Noise classification for tendering quiet asphalt wearing courses

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  1. Noise classification for tendering quiet asphalt wearing courses Hans Bendtsen, Danish Road Directorate International PartnershipMeeting Washington January 26, 2012

  2. The road administration noise challenge • Large focus on noise annoyance in the population • 30 % of households in Denmark exposed to over 58 dB (Lden) Environmental Protection Agency guideline • Effects: • Real estate prices (around 1 % per dB) • Annoyance, impacts sleep and health • Society economy 1 billion USD annually • Often main issue in public hearing on new road and infrastructure projects

  3. Propulsion Road Tyres Components of noise

  4. Propulsion

  5. Rolling - default

  6. Total

  7. DRD Noise action plan and policy • Danish Road Directorate wants good relations to the neighbors of the roads • The resources available are limited • Noise Action Plan 2008 – 2013 for state roads • Road Directorate policy for management of road noise December 2009: • Ensure the best cost effectiveness in noise abatement

  8. The state road noise action plan State road noise mapping highways over 16.000 vehicles/day • Five year goal to reduce the noise annoyance for as • many dwellings as possible along the highway sections with the highest noise levels: • Noise barriers • Noise reducing windows • 75 mill US$ over 6 years • Noise reducing pavements when pavements are renewed -over 58 dB

  9. Application of noise reducing pavements • Pavement renewal on highways • Noise reducing pavements are used: • Highways near residential areas noise over 58 dB • Highways near recreational urban areas over 58 dB • The same for construction of new highways

  10. Noise reducing pavementscommonly used in Denmark • Thin layers: • Small aggregate size • Open surface texture • Cost normally like ”ordinary” pavements: • Less material • Stronger binder • Special requirements: • Even base layer to be applied on • No need for extra baring capacity in road construction • Take care when milling • Estimated one year shorter lifetime

  11. Research and development ongoing • We started to use noise reducing thin layers • Knowledge on long time acoustical and structural lifetime • Need for types with optimized noise reduction and durability • Integration of noise in Pavement Management Systems

  12. 1st Generation System forInviting Tenders and Documenting Noise Reductionof Wearing Courses

  13. Background and aim Developed by: • Road authorities • Contractors • Consultants • The “SRS group” part of the Danish road norm organization created consensus • Uniform system: • Noise measurement • Interpretation of products • Documentation

  14. System components • Demands on test section • Reference values / Noise classes • Measurement method • Field calibration of equipment • Declaration form • Paradigm for filling form http://www.vejdirektoratet.dk/ publikationer/VInot061/index.htm

  15. Principle • Producer: Build section; measure CPXDK • Compare with reference declare / label • Classes of noise reduction: • Particularly noise reducing • Very noise reducing • Noise reducing

  16. Indsæt foto fra G:\........ • CPX • (ISO/CD 11819-2 – Draft) • Trailers: DRD and • a Dutch form M+P Measurement method: ”deciBellA”

  17. Reference values • Reference values CPXDK • 80 km/h: 102.0 dB • 50 km/h: 94.0 dB • Dense Asphalt concrete: • 11 mm aggregate • 8 years old (+2 dB) • Noise prediction method Nord2000 reference

  18. Noise Classes Noise class Noise reductionx [dB] A: Particularly noise reducing x> 7.0 B: Very noise reducing 5.0 <x < 7.0 C: Noise reducing 3.0 <x < 5.0

  19. Field Calibration • Committee (SRS-Group) • Appoint well defined calibration test sections • Equipment run (once every spring) • Results to Committee • Approval Correction K: May 2007: 50 km/h 80 km/hDRD 0.0 dB -0.4 dB Carl Bro -0.2 dB 0.0 dB

  20.   25 SRS-produkter

  21. Conclusion • Politics for noise reducing pavements in place and active • Noise reducing pavements are now used on state roads and in municipalities • Because: • There is a need for ”low cost” noise reduction • Noise reducing pavement solutions are on the marked ready for use • Road engineers and politicians know the concept • The SRS system facilitates noise as a functional request in tendering process • Cheap solution to be implemented in noise action plans • Research ongoing for improvements

  22. Thank you!

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