improving qc of asphalt paving using intelligent...
TRANSCRIPT
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Improving QC of Asphalt Paving
using Intelligent Compaction
APA of Indiana
Winter Conference
January 9 2014
Indianapolis IN
Robert Horan, PE
Regional Engineer
Asphalt Institute
Richmond VA
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Video
• Report on IC project in Utah from Salt Lake
City TV station
• Project was FHWA IC research project in
Lehi UT with two different IC rollers
• What to watch for:
• What two IC rollers were being used?
• Pronunciation of name of UDOT representative?
• What current test did reporter say could be
eliminated?
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Discussion Items
• Intelligent Compaction Usage Trends
• Importance of Compaction
• Why Do We Need Intelligent Compaction
(IC)?
• What is IC and What Are the Benefits?
• Practical Uses of IC to Improve QC of Asphalt
Paving Projects
• Preview of Session 2 – Implementation and
Logistics
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IC Usage Trends
• The number of projects nationwide which
include the use of IC has been increasing
• 2012 – less than 20 projects
• 2013 – approximately 50 projects
• 2014 – projected 150 projects
• Reasons for the increase:
• Improvement and availability of IC technology
• EDC 2 – 33 states committed to implement IC
in the next two years
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EDC2 States - IC
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Importance of Compaction
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• Compaction is the important last step in
constructing a quality asphalt pavement
• The goal of compaction is to consistently
and uniformly obtain optimum density
• Proper in-place density is essential for
good performance of asphalt pavements
• Density is directly related to the air void
content in the compacted asphalt
pavement
How Important is Compaction?
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Importance of Compaction
• Numerous research and field studies
have verified that obtaining optimum air
voids through good compaction
practices is vital to achieve expected
service life
• Therefore, we must always be looking
for innovative ways to improve
• Equipment
• QC (process control procedures)
• QA (acceptance testing and criteria)
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Question: Why Do We Need
Intelligent Compaction?
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Comparison of
Conventional Compaction
versus
Intelligent Compaction?
Why Do We Need IC?
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Compaction Technology Has
come a Long Way!
Buffalo Springfield Steam Roller
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Comparison of Conventional
Compaction and IC
• Conventional compaction equipment
and processes have shortcomings
• These shortcomings can possibly result
in poor and inconsistent densities
• IC technology addresses many of these
shortcomings
• By using IC, it is more likely that good
compaction practices will be used and
target density will be achieved.
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Shortcomings in Compaction
Process
Limited “On The Fly” Feedback Over or Under-Compaction
Can Occur
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Shortcomings in Density
Acceptance Process
Limited Number of Locations After Compaction is
Complete
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What is
Intelligent Compaction?
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What is Intelligent Compaction?
An Innovation in Compaction
and Quality Control Processes
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What is Intelligent Compaction?
Vibratory Single Drum
Soil Roller
Vibratory Tandem Drum
Asphalt Roller
Current IC technology is accelerometer-based.
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What is Intelligent Compaction?
• IC Roller Requirements (FHWA)
• IC Measurement Value (ICMV)
• GPS-Based documentation system
• On-Board, Color-coded display
• Surface temperature measurement
system
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Tandem Drum IC Roller
Suppliers Bomag
Caterpillar Sakai
HAMM-Wirtgen
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IC Measurement Value (ICMV)
• IC suppliers have various “stiffness” (or
measurement) values
• Bomag – Evib (MN/m²)
• Caterpillar/Trimble – CMV
• Hamm/Wirtgen – HMV
• Sakai - CCV
• ICMV is a generic term used to describe all
suppliers’ measurement value
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Global Positioning System (GPS)
GPS Base Station GPS Radio & Receiver GPS Rover
Real Time Kinematic (RTK) GPS Precision
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OmniStar HP on Hamm IC Roller
OmniStar is being evaluated
against land-based GPS
systems on FHWA research
projects at this time.
2-4 inch precision?
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Components of IC Roller GPS Components
On-Board,
Color-Coded Display
Accelerometer
Infrared Temperature Documentation
System Courtesy: Sakai America
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Sakai IC Onboard Display Unit
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Hamm IC Onboard Display Unit
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Color-Coded On Board Display
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Benefits of IC for HMA
• Improve density….better performance
• Improve efficiency….cost savings
• Increase information…better QC/QA
• Overall Benefit:
Improved Pavement Performance!
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Practical Uses of IC to
Improve Quality Control
• Mapping of underlying layers prior to
asphalt pavement placement
• Improved roller patterns
• 100% coverage of asphalt pavement
with roller passes/ICMV
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Mapping of Underlying Layers
Prior to Asphalt Pavement
Placement
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Mapping of the subgrade / agg. base layer
Minnesota ICPF Project
IC Mapping of Underling Layers
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Compaction/mapping of HMA base course layer
Minnesota ICPF Project
IC Mapping of Underling Layers
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HMA non-wearing course layer mapa = 0.6 mm,
f = 3000 vpm
Class 5 aggregate subbase layer map, a = 0.6 mm,
f = 2500 vpm
Reflection of hard spots onthe HMA layer
Reflection of hard spots onthe HMA layer
Reflection of
soft spots onthe HMA layer
HMA Map Subbase Map
CCVSubbase
(a = 0.6 mm, f = 2500)
0 5 10 15 20 25
CC
VS
ub
ba
se (
a =
0.3
mm
, f
= 3
00
0)
0
5
10
15
20
25
CCVSubbase
(a = 0.6 mm, f = 2500)
0 5 10 15 20 25
CC
VH
MA (
a =
0.6
mm
, f
= 3
00
0)
0
5
10
15
20
25
CCVSubbase
(a = 0.3 mm, f = 3000)
0 5 10 15 20 25
CC
VS
ub
ba
se (
a =
0.3
mm
, f
= 3
00
0)
0
5
10
15
20
25y = 2.45 ln(x) + 2.3
R2 = 0.69
y = 0.41x + 2.7
R2 = 0.33
y = 0.27x + 8.0
R2 = 0.30
MN ICPF Project
Mapping Aggr. Base
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Test bed 02 Mapping
Bomag Evib Sakai CCV
Bomag Sakai
MD ICPF Project
Mapping Milled HMA
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Summary – IC Mapping
• All mapping was done with tandem drum IC
roller
• Typical settings were low amplitude and
2500 vpm frequency
• No damage to roller or material was noted
• IC mapping seemed to be effective in
identifying soft spots in all underlying
materials except rubblized PCC
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Improved Roller Patterns
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• Roller Passes
Longitudinal Joint
Shoulder (Supported) Paving Direction
Inconsistent Roller Passes
Courtesy Sakai America
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Improved Rolling Patterns
Before
After
Sakai IC roller
Indiana ICPF Project
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100% Coverage of Compaction
Area with Roller Passes/ICMV
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Concept of “100% Coverage”
• During IC, data is collected continuously during
the compaction process:
• Roller passes
• Temperature
• ICMV
• When data is analyzed, color-coded maps are
produced that show these results for the entire
roadway
• This capability provides much more information
than current method of spot testing
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© BOMAG GmbH Slide 42
ICMV Maps Provide 100% Coverage
Documentation of Evib
and roller position
ICMV Map Display
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TB 01A Intermediate HMA Layer
Sakai CCV
Surface
temperature (oC)
Roller pass
100 % Coverage
Georgia ICPF Project
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USE AND ACCEPTANCE BY
ROLLER OPERATORS
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Acceptance by Roller Operators
Georgia HMA Demo
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What’s Next?
• Improvement and further innovation
in IC technology
• More suppliers
• More research and validation
• Increase in education/training
• Accelerated implementation
• Increased interest from contractors
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Summary – IC for Asphalt
• IC technology is available from multiple
suppliers in the United States
• IC offers many advantages over
conventional compaction equipment
• IC offers valuable new tools to the
contractor to improve Quality Control
• IC offers a way for owner/agencies to
specify innovative technology that can
improve pavement life
![Page 47: Improving QC of Asphalt Paving using Intelligent Compactionasphaltindiana.org/docs/APAIN_IC_Part_One.pdfImproving QC of Asphalt Paving using Intelligent Compaction APA of Indiana Winter](https://reader036.vdocuments.mx/reader036/viewer/2022070109/60428dbb6befb6728f757881/html5/thumbnails/47.jpg)
Bottom Line
• IC technology is an exciting innovation
that can provide many benefits to both
the agency and contractors,
• However, there are challenges that
need to be understood and addressed
to accomplish a successful construction
project using IC technology.
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www.intelligentcompaction.com
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IC is a Beautiful Thing!
Courtesy of Bruce Christianson
Questions?
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Preview of Session 2
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HOW CAN YOU SPECIFY
INTELLIGENT COMPACTION
ON YOUR ASPHALT PAVING
PROJECT?
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Specifying IC
• Read up on IC:
www.intelligentcompaction.com
• Get some training: Contact FHWA about
IC Workshops
• Generic Specifications on IC Website
• Click on “Specifications” link
• Select Materials Type
• Soils and Subbase
• Asphalt Pavement
![Page 53: Improving QC of Asphalt Paving using Intelligent Compactionasphaltindiana.org/docs/APAIN_IC_Part_One.pdfImproving QC of Asphalt Paving using Intelligent Compaction APA of Indiana Winter](https://reader036.vdocuments.mx/reader036/viewer/2022070109/60428dbb6befb6728f757881/html5/thumbnails/53.jpg)
Generic IC Specifications
• Equipment
• Rollers
• GPS
• Equipment Setup and Verification
• Technical Support
• Quality Control Plan
• Establishment of Target Value
• IC Construction
![Page 54: Improving QC of Asphalt Paving using Intelligent Compactionasphaltindiana.org/docs/APAIN_IC_Part_One.pdfImproving QC of Asphalt Paving using Intelligent Compaction APA of Indiana Winter](https://reader036.vdocuments.mx/reader036/viewer/2022070109/60428dbb6befb6728f757881/html5/thumbnails/54.jpg)
IC Analysis with Veda
FHWA Specs Require Use of
Veda
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IC for Asphalt