concrete pavement 2017 update -...
TRANSCRIPT
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Concrete Pavement
2017 UpdateGreg Mulder
John Cunningham
Iowa Concrete Paving Association
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2016 Highlights
• Performance Engineered Mixes (PEMs)
• Record-setting Concrete Events
• Overlay Performance Review
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Performance Engineered
Mixes (PEMs)
• Iowa in the national spotlight (again)
• High Durability
• Engineered for urban environment
• Low water/cement ratio
• Low permeability
• Higher substitution rate of Portland cement
• Over 30% SCMs
• Dan King, ICPA/IRMCA
*Photo courtesy of Jeremy Huntsman, HR Green
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PERFORMANCE ENGINEERED MIXTURES (PEM)
Concrete pavement mixtures engineered to enhance
long-term durability in the environment in which they
serve
Cold climates/freeze-thaw
Local materials
Urban environment
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IMPLEMENTATION IN IOWA
2016 Performance Notes
Set time concerns in Johnston and Council Bluffs
Extended time to reach opening strength
Upwards of 10-14 days in Johnston
Narrowing of sawing window—some instances of raveling
Not as significant a concern
with higher cement mixes?
No issues currently with long-
term strength
Image: CP Tech Center
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MOVING FORWARD
For any community seeing durability issues: these
mixes are a potential solution
Can implement as- or where-needed
A variety of different options are available
Agencies can choose what works best for them
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MOVING FORWARD
DOT Materials IM 529: C-SUD/CV-SUD mix
C-QMC
AASHTO draft standard will
be published this spring
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NEW CP TECH CENTER GUIDE
Published Dec. 2016
Guide to the Prevention and
Restoration of Early Joint
Deterioration in Concrete
Pavements
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Concrete Events
• 745 attendees at the 2017 Workshop!
• Record for Iowa and U.S.
• Featured speakers
• Coach Carter
• Jake Sullivan
• Concrete sundaes
• Basics of concrete
• Project reviews
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Concrete Events• Expanded locations for Concrete Forums
• Cedar Rapids
• Iowa City
• Dubuque
• Waterloo
• Mason City
• Ankeny
• Sioux City
• Council Bluffs
• Ottumwa
Current Topic:
Subgrade and Subbase Support
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Concrete Events
• Student involvement
• ISU reception with student chapters of AGC and ASCE
• Concrete sundaes/donation to ISU student chapter of APWA
• Student Hiring and Internship Portal (SHIP) at the Workshop
• Basketball game and reception for engineering students
• Iowa State vs. Kansas State on January 24
• 69 registrants (44 students)
• Iowa vs. Illinois on February 18
• 36 registrants (24 students)
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Student Involvement
U of I scholarship winner Keegan Parizek ISU scholarship winner Scott Dillavou
ICPA/ASCE/AGC Reception
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Overlay Performance
• Dan King, ICPA/IRMCA
• Iowa Highway Research Board
• Project TR-689
• Performance of Iowa’s Concrete Overlays
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CONCRETE OVERLAYS IN IOWA
Iowa: over 2,000 centerline miles of concrete overlays have
been constructed since the late ‘70s
Over half constructed since 2005
Mostly on rural county highway system
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PROJECT BACKGROUND
How well have Iowa’s overlays
performed?
Approximately 470/506 overlay
projects are still in service today
Includes 68/96 constructed before
1990
Dallas County, IA, Constructed 1977
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PERFORMANCE METRICS
Performance characterized by PCI (Pavement Condition Index) & IRI
IPMP PCI equation incorporates:
IRI (accounts for 40% of PCI)
Transverse Cracking
Joint Spalling
D-cracking
(no faulting)
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PERFORMANCE METRICS
Performance charts:
PCI scale:
Excellent: 81-100
Good: 61-80
Fair: 41-60
Poor: 21-40
Very Poor: 0-20
Image: Pavement Interactive
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RESULTS AND ANALYSIS
Data set as a whole:
Figures: Chen and Ceylan
~34 years to PCI = 60
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RESULTS AND ANALYSIS
Data set as a whole:
Figures: Chen and Ceylan
~40 years to IRI = 170
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CONCLUSIONS
Overall performance of Iowa’s concrete overlays has
been excellent
30-40+ year performance life
Overlays very well-suited to county highways
Good success to date on interstate, state highways, and city
streets as well
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Thank You!