Continuous Permeability Measurements Record Healing Inside the
Use of Continuous Deflection Measurements for Network ... - Use of Continuous Deflection...Use of...
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Use of Continuous Deflection Measurements
for Network Level Pavement Analysis
SHRP 2 R06(F)
Gerardo Flintsch, VTTI
Brian Ferne, TRL
Brian Diefenderfer, VTRC
Virginia Sustainable Pavement Research Consortium (VA-SPARC)
October 24, 2010
Pavement Evaluation 2010October 24-26, Roanoke, VA
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Contents
� Introduction
� Background & SHRP 2 Project Objectives
� Survey of Practice & Expectations
� Follow-up Interviews
� Available Equipment
� Example Applications
� Final Remarks
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Background
� Existing pavement structural capacity is a critical input for structural analysis of in service pavements
Project-level:
� Design of pavement renewal/ rehabilitationtreatments
Network-level:
� Identification of sections with structural capacity deficiencies
� Support preservation vs. Renewal decisions
0%
20%
40%
60%
80%
100%
Surface
Distress
Smoothness Structural
Capacity
Frictional
Properties
Network Level
Project Level
What pavement condition data
does your agency collect?
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Background (cont.)
� FWD technology only allow stationary measurements at discrete points along the pavement sections
�Disturbs traffic and requires traffic control ⇒⇒⇒⇒ limits productivity
� Continuous deflection measuring devices --that in some cases operate at traffic speed-- allows a better spatial coverage with less negative impact on mobility.
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
SHRP 2 R06(F) Project Objectives
� Critical and unbiased assessment of the potential of existing continuous deflection devices as practical and cost-effective tools for use in the development of optimum pavement rehabilitation strategies on rapid renewal projects
� Explore their capability for screening structural deficient sections and scoping their needs at the network level
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Proposed Outcomes/ Products
� Catalogue of existing technologies and equipment for continuously measuring pavement deflections
� Survey of the user needs in terms of pavement deflection measurement at the project and network level
� Evaluation of the identified current and emerging technologies presented in a practical and easy to use format
� Dissemination and implementation plan
� Training materials
Co
mp
lete
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Contents
� Introduction
� Background & SHRP 2 Project Objectives
� Survey of Practice & Expectations
� Follow-up Interviews
� Available Equipment
� Example Applications
� Final Remarks
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
User Need Survey
� Stage I – Web survey
� Practices and uses of deflection testing
� Pavement rehabilitation design applications
� Pavement management applications
� Stage II – Follow up Interviews
� Desired uses and capabilities
� Current PMS uses
� Experience with existing continuous deflection measuring equipment
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
User Need Survey Results
� 37 survey respondents (84%) use pavement deflection testing.
� 5 agencies (of 38 resp.) use deflections in their PMS
� Average current cost for network-level data ~ $167/mile (estimate)
� 34 agencies (85%) incorporate deflection testing into their pavement rehabilitation design procedure
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Follow-up Interviews:
� Arizona (AZ)
� Florida (FL)
� Indiana (IN)
� Kansas (KS)
� Virginia (VA)
� Montana (MT)
� New Hampshire (NH)
� New Mexico (NM)
� Oregon (OR)
States that use network-level deflection testing in their PMS
States that have some experience with a continuous deflection device, mainly the RWD
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Follow-up Interviews
Primary desired applications:
� Help identify “weak” (or structurally deficient) areas that can be then investigated further at the project-level
� Differentiate sections that may be good candidates for preservation from those that would likely require a heavier treatment
� Provide network-level data to calculate a “structural health index” that can be incorporated into a PMS
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Contents
� Introduction
� Background & SHRP 2 Project Objectives
� Survey of Practice & Expectations
� Follow-up Interviews
� Available Equipment
� Example Applications
� Final Remarks
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Deflection Measurement
� Static Measurement Devices
� Moving Measurement Vehicles with Stationary Measurement Apparatus
� Moving Measurement Vehicles with Non-Stationary Measurement Apparatus
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Continuous Deflection Measurement
Static
Measurement
Devices
Moving
Measurement
Vehicles with
Stationary
Measurement
Apparatus
Moving
Measurement
Vehicles with
Non-Stationary
Measurement
Apparatus
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Devices that met (or were close to meet) the
network-level operational requirements:
RDD
TSDs
“T
raff
ic” S
pe
ed
Slo
wer S
pe
ed
RWD
Definition: “deflection
measuring device constantly
moving that can collect data at
intervals of approximately 300
mm (1 ft) or smaller using load
levels typical of truck loading
(i.e., 40-50 kN (9-11 kips) per
wheel or load assembly).”
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
RWD
0
2
4
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14
105 110 115 120 125 130 135 140
RW
D D
efl
ecti
on
(m
ils)
Mile Marker
RWD Deflection (0.1 mile avegrage) Moving Average
Sectioning (based on last resurfacing)
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
TSD
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000
0 500 1000 1500 2000 2500 3000 3500 4000
De
fle
ctio
n S
lop
e [
mm
/m]
Chainage [m]
10m averages
100m averages
vh
vv
Slope
Slope = Vv/Vh
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
0
0.1
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0.3
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0 500 1000 1500 2000 2500 3000
De
fle
ctio
n s
lop
e (
mm
/m)
Chainage (m)
Example Network-level Application
� Detection of structurally weak sections
� Calculation of a structural “health index”?
P300 Slope 100303
P300 Slope 100303
P300 Slope 091210
Exceeds threshold
Exceeds threshold
Exceeds threshold
Rehabilitation Candidates
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Example Analysis – RWD Repeatability
0
2
4
6
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10
105 110 115 120 125 130 135 140
De
fle
cti
on
(m
ils
)
Mile Marker
Eastbound I-64- Exit 107, Crozet to Exit 136, Palmyra
Pass 1 (P1)
Pass 2 (P2)
Pass 3 (P3)
Std Deviation (0.1 mi)
Correlation Matrix
P1 P2 P3
P1 1.00 0.69 0.63
P2 0.69 1.00 0.65
P3 0.63 0.65 1.00
Old System
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
TSD Repeatability
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 500 1000 1500 2000 2500 3000 3500
De
fle
ctio
n S
lop
e [
mm
/m]
Chainage [m]
Slope Vs. Chainage, UK_F5 (NEO-W), P100 10m Averages
T120100917004 T120100917006 T120100917008 T120100917010 T120100917012 S.D.
10 m Averaging
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 500 1000 1500 2000 2500 3000 3500
De
fle
ctio
n S
lop
e [
mm
/m]
Chainage [m]
Slope Vs. Chainage, UK_F5 (NEO-W), P100 100m Averages
T120100917004 T120100917006 T120100917008 T120100917010 T120100917012 S.D.
100 m Averaging
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Comparisons
with FWD (NM Data)
Individual 0.1 mi segment comparisons Homogeneous section comparisons
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Contents
� Introduction
� Background & SHRP 2 Project Objectives
� Survey of Practice & Expectations
� Follow-up Interviews
� Available Equipment
� Example Applications
� Final Remarks
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Use of Continuous Deflection Measurements for Network Level Pavement Analysis
Final Remarks
� There seems to be a need for network-level pavement deflection data
� Identify weak sections
� Compute health indices (related to RSL?)
� Support preservation vs. renewal decisions
� Preliminary analysis suggest that:
� Continuous Deflection measurements may be able to provide level of “accuracy” and repeatability necessary for this level of analysis
� Despite of the high acquisition cost, available technology appear to be cost effective
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Use of Continuous Deflection Measurements
for Network Level Pavement Analysis
SHRP 2 R06(F)
Gerardo Flintsch
[email protected] 540-231-9748
Virginia Sustainable Pavement Research Consortium (VA-SPARC)
October 24, 2010
Pavement Evaluation 2010October 24-26, Roanoke, VA