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Rapid Technologies to Enhance Quality Control on Asphalt Pavements Infrared (IR) Scanner Showcase
Hosted by:Missouri DOTJune 1, 2016
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Welcome & Introductions
2
1. Missouri DOT
2. AASHTO
3. FHWA
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Our Focus for Today
3
Showcase Objective …
1. Describe the Infrared Scanner Technology (Equipment and Software)
2. Understand how to install and use the IR Equipment & Software
3. Discuss the results from the Missouri DOT Project
4. Understand the Contractor’s and Agency’s Opinions and/or Perspective as a QC or QA Tool
5. Know the Implementation Strategies of Lead Agencies
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IR Showcase Agenda
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Time Topic
8:00 Welcome and Introductions • Missouri DOT • AASHTO • FHWA
8:15 Overview of Infrared Technology:
• Equipment • Software
8:45 Overview of MODOT Demonstration Project: • Project Summary: plant, delivery, paving, compaction operations • Data Summary: density, IR-data
9:30 Points of View and Perspective: • Contractor QC Requirements and Perspective • MODOT QA Requirements and Perspective
9:45 Break
10:00
[Re-group for short presentation and overview on following items; then board buses and travel to paving site and plant.]
Field Visit/Demonstration: Field Trip Overview and Logistics; divide into groups (paver/roadway and plant)
• Logistics overview • Safety requirements; paver/roadway and plant • Traffic control
10:15 Field Visit/Demonstration: Four groups: 2 groups initially go to plant and 2 groups to roadway.
• Paver: Equipment and Data Collection – on site. • Plant: Monitoring Data and Decision Making – at plant.
Time Topic
12:15 Lunch on own
1:30
Summary of Results from IR Field Demonstration Projects
• Mat Uniformity • Incentives/disincentives • Lessons learned • Specifications
2:00 Implementation of IR Technology; An Overview and Introduction to Lead Agency Practice
2:10 Agency Implementation Efforts and Successes (Panel; 20 min. each)
Panel Question/Answer and Discussion from field visit and SHRP 2 Products; Topics of discussion (Panel consists of Turgeon, Carrasco, Giessel, Wells, and Stone):
• Specifications: Control and/or Acceptance Tool • Incentives/disincentives • Best Practices/Trouble Shooting Guide • Etc.
3:45 Showcase Wrap Up • Showcase Assessment Questionnaire • Photo Release Form
4:00 GPR Scanner Presentation/Demonstration (optional)
4:30 Adjourn Showcase
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Infrared Technology Showcase
Overview of Infrared Technology
June 1, 2016
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Overview of IR Technology
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1. Brief History of IR Use2. IR Equipment and Installation3. IR Software and Data Analyses
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Brief History of IR Use
Infrared Thermography Defined:• The mapping of temperature contours (equal
temperature) over the surface of a material. • Contours are used to evaluate materials by
measurement of their surface temperature and its variation.
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Brief History of IR Use
Temperature Segregation (Differential) Defined:• More than 25 ºF difference in mat temperature behind
screed.
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Brief History of IR Use
History; Mat Temperature Measurements• Temperature guns
– Point readings• Temperature cameras
– Time specific to identify areas with cold spots or thermal streaks
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Brief History of IR Use
History; Mat Temperature Measurements• IR sensors, IR-Bar; first device for continuous readings• Pave-IR Scanner; second generation device for
continuous readings
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Brief History of IR Use
Application & use of IR-Bar and Scanner• Continuous readings to
evaluate mat uniformity through temperature uniformity.
• Non-uniform temperatures usually mean, non-uniform densities.
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Brief History of IR Use
Types of Temperature Differentials: 1. Cold spots
– Truck to truck temperature differences
– Improper loading and unloading of trucks
2. Thermal streaks – Longitudinal segregation– Inadequate or non-uniform
amount of material across the mat
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Brief History of IR Use
• Aggregate segregation in mat = temperature differentials• Non-uniform temperatures = non-uniform densities
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Segregation – A difficult issue to resolve, when it is difficult to identify or confirm.
Brief History of IR Use
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Brief History of IR Use
Background• 1996 through 2000s – field
work concluded temperature differences could be accurately detected and quantified:– Low temperatures result
in low density zones in mat
– A few States adopt temperature uniformity specification
.
Temperature profile criteria based on desired density
uniformity.
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Brief History of IR Use
• Effect of cold spots, low mat temperatures on percent compaction; densities are:– Lower– More variable
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Outlier?
TTI Study: ∆25 ºF ~ ∆6 pcf
Maine DOT: ∆20 ºF ~ ∆4 pcf
Maine DOT IR Demonstration Project
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Impact of temperature differences or areas with low temperatures.
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Research and Development
Brief History of IR Use
Loss of service life or increase in maintenance costs.
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Brief History of IR Use
Cold spots; areas with increased potential for:• Fatigue cracks• Raveling• Pot holes
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Brief History of IR Use
Thermal streaks; longitudinal areas with increased potential for:• Longitudinal cracking
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Brief History of IR Use
• Effect of reduced compaction because of lower mat temperatures or inadequate rolling.
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Infrared Technology Showcase
Overview of Infrared Technology
June 1, 2016
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Overview of IR Technology
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1. Brief History of IR2. IR Equipment and Installation3. IR Software and Data Analyses
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IR Equipment
Equipment• Mast Base• Mast Extension• Mast Arm• IR Scanner• DMI• GPS Unit• Wiring• Connection bolts
& materials
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IR Equipment
IR mast base and extension attached to paver.
24Mounted Directly to Screed
Mounted to a Steel Plate Attached to Work Platform
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IR Equipment
• IR Scanner attached to paver; scans mat behind screed in one direction.
• GPS attached to the mast arm.
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IR Equipment
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IR scan screen used to see/monitor mat temperatures in real time; attached to the mast post or extension.
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IR Equipment
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DMI placed on wheel hub to measure distance during paving operation.
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IR Equipment
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Two models of data transfer and extraction
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Overview of IR Technology
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1. Brief History2. Equipment and Installation3. Software and Data Analyses
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IR Software and Data Analyses
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• Online Web App: https://eroutes.info/paveappweb/• Login is user specific
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IR Software and Data Analyses
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Explore Data: MOBA Pave Project Manager Main Screen
Color Map
Thermal Profile
Diagrams and project information
Properties
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IR Software and Data Analyses
Color Map and Properties for Screen
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IR Software and Data Analyses
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Thermal Profile Properties Screen
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IR Software and Data Analyses
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Project Properties Screen
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IR Software and Data Analyses
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Time Diagram Screen
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IR Software and Data Analyses
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Speed Diagram Screen
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IR Software and Data Analyses
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Temperature Class Diagram Screen
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IR Software and Data Analyses
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Generates PDF Report
Generating Reports
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IR Software and Data Analyses
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Generating Reports
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IR Software and Data Analyses
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Generating Reports
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IR Software and Data Analyses
Exporting Data• Export to .txt (semicolon separated) • Save as .paveproj
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Questions?
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NEXT:
• Overview of the Missouri I-29 Demonstration
Project, I-29 St. Joseph, MO
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Infrared Technology Showcase
Overview of Missouri Demonstration Project: I-29 Rehabilitation; St. Joseph, MO
June 1, 2016
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MODOT I-29 Demonstration Project
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1. Project Overview2. Data Collection3. Data Processing4. Data Summary
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MODOT I-29 Demonstration Project
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I 29; Northbound and Southbound Lanes
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MODOT I-29 Demonstration Project
Mixture delivered to site with end dump and horizontal discharge discharge trucks.
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MODOT I-29 Demonstration Project
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Mixture delivered to the Terex paver with a Roadtec MTV.
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MODOT I-29 Demonstration ProjectCompaction train included two steel wheel rollers and a rubber tired roller.
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MODOT I-29 Demonstration Project
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Non-nuclear density gauge used to measure mat density and superimposed on temperature profiles.
y = 0.0529x + 135.56R² = 0.4531
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150
155
160
260 280 300 320 340 360 380
PQI D
ensit
y(lb
/ft3 )
HMA Mat Tempterature (°F)
PQI D
ensit
y(lb
/ft3 )
HMA Mat Tempterature (°F)
TTI Study: ∆25 ºF ~ ∆6 pcf
Maine DOT: ∆20 ºF ~ ∆4 pcf
Missouri DOT:∆25 ºF ~ ∆5 pcf
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Data Analyses & Findings
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1. Project Overview2. Data Collection3. Data Processing4. Data Summary
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MODOT I-29 Demonstration Project
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Raw Temperature Profile for first part of the first lot.
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MODOT I-29 Demonstration Project
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Not mat temperatures
Summary of Raw Data for One Lot
Avg. Temp. = 296.2 ºF
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MODOT I-29 Demonstration Project
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Data diagrams reviewed during production:1. Paver speed diagram2. Time plot3. Average temperature plot
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MODOT I-29 Demonstration Project
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0 2000 4000 6000 8000 10000 12000 14000 16000
Pave
r Spe
ed (i
n/m
in)
Distance (ft)
Paver Speed Diagram
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MODOT I-29 Demonstration Project
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MODOT I-29 Demonstration Project
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1. Project Overview2. Data Collection3. Data Processing4. Data Summary
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MODOT I-29 Demonstration Project
Data Processing—eliminate invalid temperature measurements:1. Eliminate measurement locations within 2 feet of the
mat’s edge.
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MODOT I-29 Demonstration Project
Data Processing—eliminate invalid temperature measurements:2. Eliminate data with paver stops greater than 10 seconds,
between locations:– 2 feet behind measurement location of stop– 8 feet in front of measurement location of stop
3. Eliminate temperature readings < 170 ºF and > 400 ºF.
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MODOT I-29 Demonstration Project
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T1.0 T98.5
• Temperature Differential, each 150 foot segment
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MODOT I-29 Demonstration Project
• Temperature Differential Criteria, each 150 foot segment:
• Tdiff < 25 ºF No temperature difference• 25 ºF < Tdiff < 50 ºF Moderate temperature difference• Tdiff > 50 ºF Severe temperature difference
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0.15.98 TTTDiff −=
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MODOT I-29 Demonstration Project
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Temperature Bins (degree F)
Summary of Processed Data for one day of paving
Raw IR data: Tavg. = 296.2 ºFProcessed data: Tavg. = 305 ºF
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MODOT I-29 Demonstration Project
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1. Project Overview2. Data Collection3. Data Processing4. Data Summary
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MODOT I-29 Demonstration Project
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Processed Data
To include or exclude paver stops?If paver stop cause severe temperature differences:
they should be included. However:
PaverStops
Total Number of Increments
Number of Increments within Temp. Difference Regimes Thermal
StreakingMinor Moderate Severe
Excluded 816 648 135 33 None
Included 816 440 170 206 None
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Required paver stops due to sampling should be eliminated from temperature difference profiles.
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MODOT I-29 Demonstration Project
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PaverStops
Total Number of Increments
Number of Increments within Temp. Difference Regimes Thermal
StreakingMinor Moderate Severe
Excluded 816 648 135 33 NoneIncluded 816 440 170 206 None
Processed Data
Minnesota DOT’s specification:• Minor Temperature Difference: +$20 per Increment• Moderate Temperature Difference: $0 per Increment• Severe Temperature Difference: -$20 per Increment
Total Incentive to Contractor:$4,860 for the project segment [Including paver stops].
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In summary: infrared scanner data suggest overall uniform mat temperatures.
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MODOT I-29 Demonstration Project
Contact Information:• Bill Stone: [email protected]• Bob Wills: [email protected]• Mike McGee: [email protected]• Paul Angerhofer: [email protected]• Joe Reiter: [email protected]• Harold Von Quintus: [email protected]
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Questions?
69
NEXT:
• Deployment: Missouri DOT and Contractor
Points of View and Perspective
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Infrared Technology Showcase
Deployment: Missouri DOT and Contractor Points of View and Perspective
June 1, 2016
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Agency/Contractor Deployment
1. MODOT Presentation; Bill Stone:– Reasons for deploying IR Technology– Benefits – Agency points of view– Plans to implement IR Technology; short-term plans– Schedule for deployment
2. Contractor Herzog Presentation; Bob Wills: – Reasons for using IR Technology– Benefits – Contractor points of view– Making decisions in real time to minimize penalties– Use on future projects
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Questions?
72
NEXT:
• Field Visit Project; City of St. Joseph, MO
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Field Visit/Demonstration
1. Overview of Field Visit2. Safety Comments and Requirements3. Field Visit Stages and Groups 4. Buses5. Lunch
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Infrared Technology Showcase
Summary of R06C-IR Demonstration Projects
June 1, 2016
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Summary of Demonstration Projects
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1. R06C-IR Demonstration Projects2. Application and Use: Examples
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CA
AZ
CO
NM
TX
OK AR
LA
MO KY
AL GA
FL
VA
OH
MI
VTAK
MT
NV
MEWA
OR
UTKS
IDWY
ND
SD
MN
NE
WI
IAIL IN
MS
TNSC
NC
WV
PA
NY
CTNJDEMD
MANH
PR
RI
R06C-IR Demonstration Projects
DC
HI
NorthernMarianaIslands /Guam
AmericanSoma
V.I.
EFL
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R06C-IR Demonstration Projects
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Paver Stops
Total Number of Increments
Number of Increments within Temp. Regimes Thermal
StreakingMinor Moderate SevereAlaska DOT Project
Excluded 36 27 9 0 NoneIncluded 36 22 8 6 None
Maine DOT ProjectExcluded 579 546 25 8 NoneIncluded 579 494 56 29 None
Virginia DOT ProjectExcluded 84 72 10 2 NoneIncluded 84 71 9 4 None
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R06C-IR Demonstration Projects
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Paver Stops
Total Number of Increments
Number of Increments within Temp. Regimes Thermal
StreakingMinor Moderate SevereEastern Federal Lands
Excluded 108 2 24 82 NoneIncluded 108 2 16 90 None
New Jersey DOT ProjectExcluded 262 188 49 25 NoneIncluded 262 163 43 56 None
Missouri DOT ProjectExcluded 816 648 135 33 NoneIncluded 816 440 170 206 None
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R06C-IR Demonstration Projects
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Project Delivery Truck TypeMTV
IncludedPercent Severe
Temp. DifferentialsThermal
StreakingAlaska Bottom-Dump Windrows 17 None
EFL End Dump No 83 NoneIllinois End Dump No 40 NoneMaine End Dump Yes 5 None
Missouri End Dump & Flow Boys Yes 25 None
New Jersey End Dump Yes 21 None
Virginia End Dump Yes 5 None
Percentage of Segments with Severe Temperature Differentials
Above include paver stops.
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R06C-IR Demonstration Projects
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Raw Temperature Profile showing continuous improvement or more uniform mat temperatures as paving progresses.
Example from Maine demonstration project.
Near Start of
Lot
Near Center of Lot
Near End of
Lot
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R06C-IR Demonstration Projects
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Raw Temperature Profile showing continuous improvement or more uniform mat temperatures as paving progresses.
Example from Missouri demonstration project.
Near the beginning
Near Center of Lot
Near End of
Lot
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Summary of Demonstration Projects
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1. Field Demonstration Projects and Products2. Application and Use: Examples
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Application and Use: Examples
Application & Use, WHY:• Continuous readings to evaluate
mat uniformity through temperature uniformity.
• Non-uniform temperatures imply non-uniform densities, which usually mean higher maintenance.
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Application and Use: Examples
Role of IR in Quality Assurance Programs1. Quality control plan; contractor
– Improve communication between personnel– Reduce risk of being penalized– Forensic tool to trouble shoot low or non-uniform
densities2. Acceptance plan; agency
– Reduce future distress and maintenance costs – Dispute resolution
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Application and Use: Examples
IR Role in Quality Control Plan; 4 examples1. Missouri demonstration project2. Maine demonstration project3. Virginia demonstration project4. Federal Lands demonstration project
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Application and Use: Examples
1. Missouri demonstration project– Increased communication between plant and paver to minimize
temperature differentials of mat.
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Application and Use: Examples
2. Maine demonstration project– Monitor average temperature differential on a lot by lot basis for
identifying need to take action.– 85 percent of segments exhibited < 25 ºF.– If average temperature differential exceeds 15 ºF, risk for penalty
increases.
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Maine DOT: ∆20 ºF ~ ∆4 pcf
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Application and Use: Examples
3. Virginia demonstration project– Identify reason for severe temperature differentials
and take action.• Avg. temperature differential at start of paving
project; about 30 ºF.• Avg. temperature differential after adding two
trucks; about 15 ºF.
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Application and Use: Examples
4. Federal Lands demonstration project– Identify reason for severe temperature differentials and
take action; loading of trucks.• One dump of mix in truck bed – severe temp.
differential• Two dump, no stockpile – reduced temp. differential.
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Application and Use: Examples
IR Role in Acceptance Plan; examples:1. Identify cold spots
– Colorado, Michigan, Minnesota, Quebec, Texas, Washington
2. Identify thermal streaks– Quebec
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Application and Use: Examples
Specification Guide; AASHTO PP 80-14
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1. Scope2. Referenced Document3. Terminology4. General Thermal Profile Requirements5. Hardware6. Data File Format7. Calibration8. Profiler Accuracy9. References10.Appendices (Non-mandatory)
1. Example Acceptance Criteria2. Terminology3. Criteria4. Monetary Adjustment
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Application and Use: Examples
IR Role in Acceptance Plan• Determine biased areas for
sampling and testing– Washington DOT
• Determine pay factors– Minnesota DOT– Quebec
• Minnesota pay factors for each 150 foot segment:– $20 bonus; <25ºF– $20 penalty; >50ºF
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Summary of Demonstration Projects
Conclusion from demonstration projects, to-date:• Pave-IR scanner is one tool to confirm a uniform, high-
quality mat.• Lessons learned
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Questions?
94
NEXT:
• Implementation of IR Technology
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Infrared Technology Showcase
Implementation of IR Technology
June 1, 2016
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Implementation of IR Technology
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1. Some Common Steps for Deployment2. Texas DOT: Gisel Carrasco3. Minnesota DOT: Curt Turgeon4. Alaska DOT: Richard Giessel
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Steps for Deployment
Deployment Strategy, Common Steps/Tasks:1. Define temperature differences that cause significant distress,
increasing maintenance cost & reducing service life (Minnesota, Ontario, Texas, Washington). a) Many published reports that document the importance of
temperature2. Identify mat property changes between areas with severe temperature
differentials (Ontario, Texas).a) Many research reports that identify how density affects the mat’s
properties related to performance3. Draft IR specification (Minnesota, Ontario, Texas, Washington)4. Obtain comments from industry for revising specification; getting input
from other partners (Ontario, Minnesota, Texas)5. Host/sponsor training sessions with equipment/software
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Steps for Deployment
Deployment Strategy, Common Steps/Tasks:6. Execute pilot projects over 1 to 2 years (Minnesota, Ontario)7. Educate industry/agency personnel on results (Ontario)8. Update/revise specification (Minnesota, Ontario, Texas, Washington)9. Establish actions based on temperature profile differences (all)
a) Increased density testing (Texas) b) Biased testing (Washington)c) Incentives/disincentives based temperature differentials
(Minnesota, Ontario)10. Confirm appropriateness of acceptance plan (Ontario)11. Full deployment
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Steps for Deployment
Some Questions for Deployment:1. How many projects has Pave-IR ScanTM been used on?2. How many projects were for quality assurance?3. What percent of profiles exhibited medium & severe temperature
differences?4. How easy is it to set up the project in Pave-IR ScanTM?5. Any problems experienced with the equipment?6. Has the Pave-IR system changed daily practice?7. Has use of the Pave-IR system changed interaction between the
owner & contractor?8. How easy is the IR data to extract and process?9. Do you review the Pave-IR reports at the end of the day?10. Do you think you are getting a higher quality mat at the end of the
day using the Pave-IR system?11. How have agencies/contractors used the IR products? 99
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Implementation of IR Technology
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1. Some Common Steps for Deployment2. Texas DOT: Gisel Carrasco3. Minnesota DOT: Curt Turgeon4. Alaska DOT: Richard Giessel
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Infrared Technology Showcase
Panel Discussion on IR Deployment and Use
June 1, 2016
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Panel Discussion
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• Moderator: Mike McGee, FHWA• Participants: Missouri DOT: Bill Stone Herzog: Bob Wills Texas DOT: Gisel Carrasco Minnesota DOT: Curt Turgeon Alaska DOT: Richard Giessel
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Some Questions
1. Is the type of project a consideration for IR use?2. How easy is it to set up the project in Pave-IR ScanTM?3. Any problems experienced with the equipment or software?4. Has the Pave-IR system changed daily practice?5. Has use of the Pave-IR system changed interaction between
the owner & contractor?6. How easy is the IR data to extract and process?7. Do you review the Pave-IR reports at the end of the day?8. Do you think you are getting a higher quality mat at the end of
the day using the Pave-IR system?9. How have agencies/contractors used the IR products?10. What is value of IR to the Contractor and Agency?
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Workshop Wrap-Up
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• Complete workshop forms
• R06C: additional information on Infrared Tech.
AASHTO Site: http://shrp2.transportation.org
FHWA Site: www.fhwa.got.gov/goshrp2
• Next on the agenda:
Presentation and Demonstration of Ground
Penetrating Radar Equipment