Kevin McGhee Associate Principal Scientist - Virginia Tech Kevin Mc… · Kevin McGhee Associate...
Transcript of Kevin McGhee Associate Principal Scientist - Virginia Tech Kevin Mc… · Kevin McGhee Associate...
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Kevin McGhee
Associate Principal Scientist
SURF 2012
Norfolk, VA
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Code of Virginia § 33.1-223.2:21 (2011)
Directs VDOT to:
Expedite the development of quiet pavement (QP)
technologies such that applicable contract solicitations
include specs for QP technology if sound mitigation is
a consideration.
To that end, VDOT will:
Construct demonstration projects to assess QP
technologies.
Evaluate functionality/ safety in Virginia's climate
over two full winters.
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Quiet Pavement Technologies Asphalt:
• Open-graded with 9.5mm top-size stone and rubberized AC (AR-PFC 9.5)/25mm
• Open-graded with 9.5mm top-size stone and polymer-mod. AC (PFC 9.5)/25mm
• Open-graded with 12.5mm top-size stone and polymer-mod. AC (PFC 12.5)/50mm
Concrete:
• Conventional Diamond Grind (CDG)
• Next Generation Conc. Surf. (NGCS)
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Project Selection Criteria
• Four-lane divided, high-speed corridor
• Good overall pavement structure
• Good geometrics
• Limited at-grade intersections
• 1-mile per asphalt technology/ ½-mile for
concrete
• No curb/gutter or existing sound
mitigation measures
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10/26/2012 5
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Demonstration Projects (Asphalt)
SMA 9.5 (40mm) AR-PFC 9.5
(25mm)
PFC 9.5
(25mm)
PFC 12.5 (50mm)
Plan View
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PFC 12.5 AR-PFC 9.5
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Demonstration Projects (Conc)
8
Exist. Finish
Conv. Grind (CDG)
Next Gen. Concrete
Surface (NGCS)
Exist. Finish
Plan View
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NGCS
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Conventional Grind
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Preliminary Findings – functional assessment of “new” materials and treatments
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Noise Measurement
Tire-Pavement (i.e. OBSI) Wayside
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Wayside Noise (“Reduction”)
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
AA
SH
TO
TP
99-1
2,
dB
(A)
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Locked-Wheel
System (LWS) GripTester (GT)
Tire-Pavement Friction
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Tire-Pavement Friction
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
SMA9.5
AR PFC9.5
PFC 9.5 PFC12.5
NGCS CDG Control
LWT
GT
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Macrotexture
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
SMA9.5
ARPFC9.5
PFC9.5
PFC12.5
NGCS CDG Control
MP
D (
mm
)
RWP
BWP
ASTM E2157
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Ride Quality
0.0
0.2
0.4
0.6
0.8
1.0
1.2
SMA-9.5 AR-PFC9.5 PFC 9.5 PFC 12.5
IRI (m
/km
) Inertial
Profiler
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Pay Adjustment for Evenness
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
SMA-9.5 AR-PFC9.5 PFC 9.5 PFC 12.5
Incen
tive (
$/t
on
)
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Technology Costs
Pavement
Description
Average Costs
Per Ton ($) Square Meter ($)
SMA 9.5 (Control) 108.50 11.00
AR-PFC 9.5 125.81 6.90
PFC 9.5 116.00 6.36
PFC 12.5 110.33 12.09
Diamond Grind N/A 8.20
NGCS N/A 12.96
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Effectiveness (Noise Reduction)
0.00
1.00
2.00
3.00
4.00
5.00
Co
st
($/d
B/S
M)
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Summary (Tire-Pavement Noise)
• Quiet asphalt technologies measurably less noisy on average than control (note: control technology NOT noisy)
• Next Generation Concrete Surface (NGCS) noticeably less noisy than control
• None of the surfaces became louder over the winter (note: milder than normal winter)
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Summary (Other Properties) • Ride quality is critical to quiet pavements
and excellent ride quality was achieved in the projects.
• The QP technologies exhibit good resistance to skidding
• The QP technologies have reduced splash and spray with improved wet-weather visibility
• There were no reports of compromised safety during winter weather with QP
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Next Steps
• More demonstration projects and test section installs in 2012 • AR-PFC 12.5 and AR-SMA 9.5 – NOVA and
Culpeper Districts
• National Center for Asphalt Technology (NCAT) – AR-PFC and PFC
• Noise (and other) testing continues
• Costs will continue to be evaluated Life-Cycle Assessment (LCA)
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Cost Components for LCA
• Allowable substitution – will FHWA permit QP strategy in lieu of noise barriers?
• “Acoustic longevity” – QP replacement cycle?
• Additional maintenance costs – winter and periodic cleaning/vacuuming
• Value of other functional benefits – e.g., reduced rolling resistance, improved safety & comfort, etc.
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