Concrete Pavement

2017 UpdateGreg Mulder

John Cunningham

Iowa Concrete Paving Association

2016 Highlights

• Performance Engineered Mixes (PEMs)

• Record-setting Concrete Events

• Overlay Performance Review

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

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

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

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

MOVING FORWARD

DOT Materials IM 529: C-SUD/CV-SUD mix

C-QMC

AASHTO draft standard will

be published this spring

NEW CP TECH CENTER GUIDE

Published Dec. 2016

Guide to the Prevention and

Restoration of Early Joint

Deterioration in Concrete

Pavements

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

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

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)

Student Involvement

U of I scholarship winner Keegan Parizek ISU scholarship winner Scott Dillavou

ICPA/ASCE/AGC Reception

Overlay Performance

• Dan King, ICPA/IRMCA

• Iowa Highway Research Board

• Project TR-689

• Performance of Iowa’s Concrete Overlays

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

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

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)

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

RESULTS AND ANALYSIS

Data set as a whole:

Figures: Chen and Ceylan

~34 years to PCI = 60

RESULTS AND ANALYSIS

Data set as a whole:

Figures: Chen and Ceylan

~40 years to IRI = 170

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

Thank You!