TIRE / PAVEMENT NOISE CHARACTERISTICS OF WEARING COURSE ASPHALT MIXTURES
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Transcript of TIRE / PAVEMENT NOISE CHARACTERISTICS OF WEARING COURSE ASPHALT MIXTURES
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TIRE / PAVEMENT NOISE CHARACTERISTICS OF WEARING COURSE ASPHALT MIXTURES
•Douglas D. Carlson
•Rubber Pavements AssociationRubber Pavements Association
•Executive DirectorExecutive Director
•[email protected]@rubberpavements.org
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Portorož, Slovenia
Special Thanks to Co-Authors
George B. Way - Recycled Tire Engineering Research Foundation
Ali Zareh - Arizona DOT
Kamil E. Kaloush - Arizona State University
Krishna Prapoorna Biligiri - Arizona State University
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PRESENTATION OUTLINEo Research Objective
o Discussion on Asphalt-Rubber
o Interstate – 10 Wearing Course Test Sections• Background
• Pavement Types
• Pavement Mix Design
o Field Noise Studies • Scofield, 2002
• Carlson et al, 2007
• Dynatest Inc. 2008
o Conclusions & Future Research
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OBJECTIVE
o Evaluate tire / pavement noise characteristics of five different pavement wearing courses placed as test sections on the Interstate-10, Arizona, by means of field noise measurements.
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Asphalt-Rubber (binder/bitumen)
o ComponentsComponents• 80 % Asphalt (Bitumen)80 % Asphalt (Bitumen)• 20 % Ground Tire Rubber20 % Ground Tire Rubber
o Common Surface in Arizona Common Surface in Arizona • A-R Asphalt Concrete Friction CourseA-R Asphalt Concrete Friction Course
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Scrap tires are collected for processing
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Scrap Tires are Shredded and Granulated
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Steel and Fiber are Removed
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Minus No. 10 mesh is used; free of wire and other
contaminants; up to 0.5%
fiber.
Crumb Rubber
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Asphalt-Rubber Blending Equipment
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Rubber is loaded into Weigh Hopper
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By Adding Rubber to the Bitumen, The Rubber is Able to Absorb and Retain the Aromatic Oils in Asphalt
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Asphalt-Rubber and Polymer Modified Bitumen
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A-R Can Be Used Anywhere Asphalt Is Used
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I-10 WEARING COURSE EXPERIMENT Arizona DOT Preventive
Maintenance Pavement Preservation Experiment – 1999
Mile Post 186.2 to 195.3 East Bound
Annual Daily Traffic (ADT) ~ 60,000 with 25% trucks
Total Equivalent Single Axle Loads (ESALs) ~ 26 Million
5 Asphalt Concrete Pavement Types as Test Sections
32 Replicate Test Cells
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99-099-31 99-099-31
SCHEMATIC OF I-10 TEST
SECTIONS
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Picture of Dense Gradation and ARFC
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WEARING COURSE PAVEMENT TYPES
Asphalt Rubber Open Graded Friction Course (AR-ACFC) ADOT Standard Open Graded Friction Course (ACFC) Polymer Modified Open Graded Friction Course (P-ACFC) Permeable European Mixture (PEM) Stone Matrix Asphalt (SMA)
Size AR-ACFC ACFC P-ACFC PEM SMA3/4 100 100 100 100 1001/2 100 100 100 80-90 1003/8 100 100 100 35-60 70-90
No. 4 30-45 35-55 35-55 10-25 30-50No. 8 4-8 9-14 9-14 5-10 20-30
No. 200 0-2.5 0-2.5 0-2.5 0-2.5 8-13AC (%) 9.2 6.0 6.0 6.0 6.5
Binder Grade PG 76-22+ PG 64-16 PG 76-22+ PG 76-22+ PG 76-22+
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Materials and Air Voids (2008)
17.7% 9.65% 20.96% 17.14% 16.6%
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AR-ACFC ¾” (19 mm)
December 2007
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SMA ¾” (19 mm)
December 2007
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P-ACFC ¾” (19 mm)
December 2007
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PEM 1 ¼” (32 mm)
December 2007
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ACFC ¾” (19 mm)
December 2007
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TIRE / PAVEMENT NOISE STUDIES
OBSI NOISE MEASUREMENTS Scofield, 2002:
Fall 2002 Arizona’s QPP AR-ACFC Quietest
Dynatest, Inc. 2008: March 2008 CA – AZ Noise Study AR-ACFC Quietest P-ACFC Loudest
Pavement Type Sound Intensity at 60 MPHAR-ACFC 98.90
ACFC 99.80P-ACFC 100.60
PEM 101.00SMA 99.80
Pavement Type Sound Intensity at 60 MPHAR-ACFC 99.94
ACFC 102.84P-ACFC 104.68
PEM 101.56SMA 102.17
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ADOT CPX Trailer (Scofield 2002)
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Dynatest OBSI Configuration 2008
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SPOT CHECK TIRE / PAVEMENT NOISE STUDY
CARLSON ET AL, 2007: Fall (December) 2007; ADOT ↔ RPA ↔ ASU OBSI technique was not used A hand held noise meter attached to the running
board of a van Noise meter in close proximity to the tire /
pavement interface A similar technique used historically in AZ (early
1990’s)
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SPOT CHECK TIRE / PAVEMENT NOISE STUDY CONT’D…
AzDOT Method 1995
Spot Check 2007
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SPOT CHECK TIRE / PAVEMENT NOISE STUDY CONT’D…
Sound meter calibrated to measure sound intensity in the range of 80 to 130 decibels (dB)
A computer connected to the sound meter to store the data Stored data transferred to a PC via an RS-232 interface and
analyzed using the system software 4 runs performed at three different speeds
60 MPH (100 Km/h) 72 MPH (120 Km/h) 75 MPH (135 Km/h)
Pavement Type Sound Intensity at 60 MPHAR-ACFC 102.40
ACFC 104.77P-ACFC 104.98
PEM 102.69SMA 104.48
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TIRE / PAVEMENT NOISE COMPARISONS BETWEEN 2002, 2007 & 2008
102.40
104.77 104.98
102.69
104.48
102.17101.56
104.68
99.94
102.84
98.9
99.8
100.6
101.0
99.8
96
97
98
99
100
101
102
103
104
105
106
AR-ACFC ACFC P-ACFC PEM SMA
Tir
e / P
avem
ent
Noi
se (
dB
)
2007 Measured at 60 MPH Dynatest 2008 at 60 MPHScofield-Donovan 2002 at 60 MPH
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2% 5%
7%
11%
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35%
65%
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Percent Cracking Guide
2%
5%
65%
35%
11%
7%
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Portorož, Slovenia
Raveling a Scale from 1 (best) to 5 (worst)
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Surface Distress
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Distress Index (Cracking and Raveling) Ranking
Section Distress
1. AR ACFC 3.2
2. SMA 10.5
3. PEM 14.2
4. ACFC 14.7
5. Polymer ACFC 19.5
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Noise (OBSI 2008) and Distress
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CONCLUSIONS
OBSI Noise data for 2002 & 2008 and Distress 2008>>
1. AR-ACFC 1. AR-ACFC 1. AR-ACFC
2. ACFC & SMA 2. PEM 2. SMA
3. SMA 3. PEM
4. P-ACFC 4. ACFC 4. ACFC
5. PEM 5. P-ACFC 5. PACFC
2007 spot check technique agrees with 2008 OBSI measurements, in terms of rank. Difference ~1.5 dB
Noise level of each test section appeared related to the degree of surface deterioration AR-ACFC experienced the least cracking and wear after 8 years of service
Future Work: Field Cores collected will be used for laboratory Noise Evaluation
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Questions & Comments