noooo soooooo omopo oopfc oo aoooooo toooo trb13.pdf · 105.3 105.6 105.6 105.6 102.0 101.8 103.0...
TRANSCRIPT
![Page 1: Noooo Soooooo oMoPo ooPFC oo Aoooooo Toooo TRB13.pdf · 105.3 105.6 105.6 105.6 102.0 101.8 103.0 102.2 102.0 102.2 100 101 102 103 104 105 106 107 108 A B C D E Avg Overall Level](https://reader033.vdocuments.mx/reader033/viewer/2022060603/60585228eec94806c573b50c/html5/thumbnails/1.jpg)
Noooo Soooooo oo MoPoo PFC oo
Aoooooo Toooo
ADC40 2013 Summer Meeting
Manuel Trevino
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Introduction • MoPac
– Busy urban highway – Pavement: dense-graded AC – Section in central Austin: PFC overlay to mitigate noise
– OBSI – SPL measurements
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Project Location MoPac PFC
Austin, Texas
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Project Location MoPac PFC
Austin, Texas Town Lake
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Population and Traffic
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Source: TxDOT
MoPac
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MoPac (aka Loop 1)
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PFC • Permeable Friction Course overlay constructed
summer 2010 – From RM 2222 to Town Lake – 1 ½ in.-thick – Southbound: PG 76-22 binder (PG-PFC) – Northbound: Asphalt-Rubber binder (AR-PFC)
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OBSI Measurements • Noise measurements taken regularly
• Outside, middle, and inside lanes
• Three 440-ft subsections in each direction
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OBSI Measurements
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Before-After Comparison (Outside Lanes)
105.3
101.7
100
101
102
103
104
105
106
107
108
A B C D E H I J K L Avg
Ove
rall L
evel
(dB
A)
Southbound (PG Binder) Northbound (AR-PFC)
Before (DGAC), July 2010 After (PFC), September 2010
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Southbound PFC
105.8 105.7 105.3
105.6 105.6 105.6
102.0 101.8
103.0
102.2 102.0
102.2
100
101
102
103
104
105
106
107
108
A B C D E Avg
Ove
rall L
evel
(dB
A)
PG-PFC
Before (DGAC) July 2010 After (PFC) September 2010
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Northbound PFC
105.1 105.1 104.7
104.5
105.1 104.9
102.1
101.4 101.0
101.6 101.3 101.5
100
101
102
103
104
105
106
107
108
H I J K L Avg
Ove
rall L
evel
(dB
A)
AR-PFC
Before (DGAC) After (PFC)
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Southbound PFC
65
70
75
80
85
90
95
100
105
400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000
Ove
rall L
evel
(dB
A)
1/3-Octave Band Center Frequency (Hz)
Before (DGAC) After (PFC)
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Northbound PFC
65
70
75
80
85
90
95
100
105
400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000
Ove
rall L
evel
(dB
A)
1/3-Octave Band Center Frequency (Hz)
Before (DGAC) After (PFC)
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98
99
100
101
102
103
104
105
106
1-SB 2-SB 3-SB SB - Avg 1-NB 2-NB 3-NB NB - Avg
Ove
rall L
evel
(dB
A)
Section Number
Southbound: PFC with PG76-22 binder Northbound: PFC with asphalt rubber binder
Outside Lane Middle Lane Inside Lane
Lane Comparison
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96
98
100
102
104
106
108
Ove
rall
Leve
l (dB
A)
PG-PFC AR-PFC Dense-Graded
MoPac vs. Other Pavements (2012 Measurements)
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• PFC provided an average reduction of 3.4 dBA, compared to DGAC
• NB (AR-PFC) significantly and consistently quieter than SB (PG-PFC)
• Middle lanes appear to be slightly louder, but differences are minimal
• PFC seems to have got quieter with time, but the slight decrease in noise levels could be attributed to 2012 tests being performed with a brand-new tire
Conclusions
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• Compared to other sections, SB PFC is average among other PG PFCs in the state
• NB PFC is the quietest in the state, even quieter than the US 281 PFC in San Antonio, which for years had been the quietest PFC in Texas
Conclusions
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SPL Measurements
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• Continuous flow traffic time-integrated method (CTIM)
Normalizes for traffic variations using FHWA TNM (allows for comparison of data collected at different times)
Roadside Measurements
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• Noise sources included: – Engine noise, exhaust noise – Aerodynamic sources – Adjacent vehicles – Non-traffic noise
– Railroad noise – Reflections
SPL Measurements
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• Two SPL meters
• Video camera
• Speed radar
SPL Measurements
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SPL Measurements
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SPL Measurements
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SPL Measurements
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SPL Measurements • Summer testing
• Nine locations
• Two simultaneous measurements at each location – One next to highway (A) – One close to the residential
area (B)
• During non-peak hours
• Before and after PFC
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Example: Sites 1 (SB) and 2 (NB)
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Roadside Measurements (A)
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Residential Measurements (B)
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50
55
60
65
70
75
80
85
1A 1B 2A 2B 3A 3B 4A 4B 5A 5B 6A 6B 7A 7B 8A 8B 9A 9B
Soun
d Pr
essu
re L
evel
(dB
A)
Site
Before PFC (April-May 2010)
PFC (September-October 2010)
PFC (August 2011)
SPL Measurements
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• PFC provided significant noise reduction at all sites compared to dense-graded AC
• PFC resulted in 6 to 7 dBA noise reduction, on average
• PFC continues to perform well acoustically
Conclusions
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Acknowledgement • TxDOT, Austin District
• Mike Arellano, TxDOT Austin District Pavement Engineer
• John Wirth, TxDOT Construction Division/Materials & Pavements