Noise classification for tendering quiet asphalt wearing courses Hans Bendtsen, Danish Road Directorate International Partnership MeetingWashington January 26, 2012

The road administration noise challenge  Large focus on noise annoyance in the population  30 % of households in Denmark exposed to over 58 dB (L den ) 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

Tyres Road Propulsion Components of noise

Propulsion

Rolling - default

Total

DRD Noise action plan and policy  Danish Road Directorate wants good relations to the neighbors of the roads  The resources available are limited 1.Noise Action Plan 2008 – 2013 for state roads 2.Road Directorate policy for management of road noise December 2009: Ensure the best cost effectiveness in noise abatement

The state road noise action plan L den dB63-68 dB68-73 dB>73 dBTotal Number dwellings 39,00015, ,500 State road noise mapping highways over 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

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

Noise reducing pavements commonly 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

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

1 st Generation System for Inviting Tenders and Documenting Noise Reduction of Wearing Courses

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

System components  Demands on test section  Reference values / Noise classes  Measurement method  Field calibration of equipment  Declaration form  Paradigm for filling form publikationer/VInot061/index.htm

Principle  Producer: Build section; measure CPX DK Compare with reference declare / label Classes of noise reduction: A. Particularly noise reducing B.Very noise reducing C.Noise reducing

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

Reference values  Reference values CPX DK 80 km/h: dB 50 km/h: 94.0 dB  Dense Asphalt concrete: 11 mm aggregate 8 years old (+2 dB) Noise prediction method Nord2000 reference

Noise Classes Noise class Noise reduction x [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

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/h DRD 0.0dB-0.4 dB Carl Bro-0.2dB 0.0 dB

  25 SRS- produkter

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

Thank you!