Concrete Overlay Performance on Iowa's Roadways

Project status

In progress

Start date: 11/01/15
End date: 04/30/19


Principal investigators:

Co-principal investigators:

About the research

The objective of this study is to develop a report on the performance of concrete overlays in Iowa. Concrete overlays have been constructed on Iowa roadways since 1960. The performance of concrete overlays on the state system is well documented based on Iowa Department of Transportation (DOT) data collected using automated approaches from the 1990s. In addition, the Iowa DOT began collecting automated distress and condition data for all public roads including local streets in 2013. The Iowa Concrete Paving Association (ICPA) maintains a comprehensive list of all of the concrete overlays constructed in Iowa.

By combining the information from the Iowa DOT and the ICPA, it is now possible to assess the performance of concrete overlays on the whole system. Plans are to develop a database of the existing overlays and their performance and make the database available to agencies in the state. The research report developed will include causes of failure and reasons for success, along with lessons learned. This will provide cities, counties, and the Iowa DOT with easy access to information on the type of overlay they are considering and help them in reviewing the particulars on each type of overlay prior to deciding which fits their needs.



  • Iowa Department of Transportation
  • Iowa Highway Research Board

Partner(s): Iowa Concrete Paving Association