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PE 2019
Assessment of Jointed Concrete Pavement Using
Continuous DeflectionJerry Daleiden, P.E.
ARRB Group, Inc.
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PE 2019
Evolution of PCC Structural Assessments
Three goals:
1. Review challenges/pitfalls of A. Traditional assessments
B. Original TSD on PCC
2. Share recent findings
3. Review case studies and potential implications
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PE 2019
“Rigid Pavements”
• By definition are intended to be VERY stiff.
• Should (by design) have very little deflection.
• We are seeking the exceptions.
– “The needles in the haystack”
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PE 2019
Continuous vs. Sampled
Pavement Assessment historically “Sample" based
Pavement conditions, vary along roadways
• Ride
• Density (Intelligent Compaction, Infrared, GPR)
• Segregation (Texture)
• Structural Integrity (TSD, GPR)
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PE 2019
Traditional Strength Measurement
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PE 2019
Structural Assessment - Evolved
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PE 2019
Continuous Deflection Measurement
Load
Deflection Slope = VV/VH
VH
VV
*not to scale
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PE 2019
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PE 2019
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PE 2019
Filters:• IRI > 120• Rutting > 0.3 in• WP Cracking > 50%• D0 > 21 mils
Significant visible cracking
High maximum deflection (D0)
Moderate outer
deflections
0 7260483624128
Def
lect
ion
(m
il)
Structurally Deficient+ (Case 1)
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PE 2019
Case #2 – Structurally Deficient, but?20 ft
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PE 2019
https://us.hawkeyeinsight.com/app#/dataviewer?lat=39.329796055&lon=-101.618245504&zoom=15&maptypeid=roadmap&projectid=222&roadid=0070W&direction=Reverse&chainage=23.074&datasourceid=1200&selectedproject=222
Case #2 – Structurally Deficient, but?
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PE 2019
15 ft 15 ft
High deflection at (assumed) joint location
High deflections near moisture on shoulder
Case #2A – Structurally Deficient, but?
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PE 2019
• Availability of Continuous Structural Capacity:
• Facilitates detection of structural deficiencies,
• In spite of Good Surface Condition.
• Enables Agencies to be more proactive:
• Plan for future,
• Rather than reacting to deterioration.
Structurally Deficient But…? (Case 2)
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PE 2019
https://us.hawkeyeinsight.com/app#/dataviewer?lat=41.211990778&lon=-73.185464105&zoom=14&maptypeid=roadmap&projectid=229&roadid=CT-8&direction=Reverse&chainage=2.781&datasourceid=1398&selectedproject=229
Structurally Adequate, But? (Case 3)
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PE 2019
Low deflection at deteriorated
longitudinal jointLow deflections over
joint and cracked area
Structurally Adequate, But? (Case 3)
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PE 2019
All Good (Case 4 …Celebration )
No visible cracking
Filters:• IRI < 120• Rutting < 0.3 in• WP Cracking < 25%• D0 < 6 mils
Low maximum deflection (D0)
Low outer deflections
0 7260483624128
Def
lect
ion
(m
il)
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PE 2019
Net Result
Collecting Continuous Structural Capacity Data,
as part of an overall assessment provides:
• Better understanding of overall pavement condition
• Less traffic disruption
• Opportunity for better project and treatment selection
• More Cost Effective
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PE 2019
Comprehensive Assessment Opportunities
Network Level Evaluations:Which roads require treatment.
What treatments should be planned.
More Comprehensive Assessment of Network.
Project Level EvaluationsLocalized areas requiring unique treatment.
Additional Structure Needed.
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PE 2019
Questions?Is load transfer efficiency still the best metric
for evaluating JCP structural capacity?
?What metric(s) are needed?
?What are the perceived limitations and/or potential approaches for mitigation?
?What additional applications merit consideration?