Noise classification for tendering quiet asphalt wearing coursesHans Bendtsen, Danish Road Directorate

International Partnership Meeting Washington 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 (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

Tyres

RoadPropulsion

Components of noise

60

65

70

75

80

85

90

20 30 40 50 60 70 80 90 100 110 120 130 140

Speed [km/h]

LAFmax [dB]

P_Prop

Propulsion

60

65

70

75

80

85

90

20 30 40 50 60 70 80 90 100 110 120 130 140

Speed [km/h]

LAFmax [dB]

P_RollP_Prop

Rolling - default

60

65

70

75

80

85

90

20 30 40 50 60 70 80 90 100 110 120 130 140

Speed [km/h]

LAFmax [dB]

P_TotP_RollP_Prop

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

Lden 58-63 dB 63-68 dB 68-73 dB >73 dB Total

Number dwellings

39,000 15,000 3000 1500 58,500

State road noise mapping highways over 16.000 vehicles/day

Five year goal to reduce the noise annoyance for asmany 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 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

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

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

Background and aimDeveloped 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

http://www.vejdirektoratet.dk/publikationer/VInot061/index.htm

Principle Producer: Build section; measure CPXDK

• 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 11819-2 – Draft)• Trailers: DRD and a Dutch form M+P

Measurement method:

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

Noise ClassesNoise 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/hDRD 0.0 dB -0.4 dBCarl Bro -0.2 dB 0.0 dB

5 1 3 4 2 2 1 15 4 4 3 6 285

90

95

100

105A

C 6

o

AC

8o

PA

6

PA

8

SM

A 4

SM

A 4

+

SM

A6

SM

A 6

+

SM

A 8

UTL

AC

6

UTL

AC

8

AC

11d

SM

A 1

1

CPXDK 80 km/h [dB]

C

B

A

7 3 4 3 3 3 20 12 5 2 7 185

90

95

100

105A

C 6

o

PA

6

PA

8

SM

A 4

SM

A 4

+

SM

A 6

SM

A6+

SM

A 8

UTL

AC

6

UTL

AC

8

AC

11d

SM

A 1

1

CPXDK 50 km/h [dB]

C

B

A

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!