Welcome Letter

The Illinois Chapter of the American Concrete Pavement Association has been at the forefront in providing service to the concrete pavement industry for many years.  I would like to take this opportunity to introduce myself as the new Executive Director of the ILACPA.  My predecessor, Mr. Randy Riley, made great contributions towards advancing concrete pavement technology both in Illinois and on the national level for many years and will be greatly missed. 

I have been actively involved in the industry for over 35 years and have served in academia as an Associate Professor at Oklahoma State University, as a pavement consultant specializing in design, materials, construction and pavement rehabilitation and finally as a Director at ACPA National.  My consulting business has provided me the opportunity to travel and work abroad as well as in the U.S. on a wide variety of projects including airports, high volume roadways and local roads.  I can say without reservation that the U.S. is considered the leader in concrete pavement technology and Illinois has, and will continue, to be one of the leaders in research and innovation.

We are in the process of re-engineering the ILACPA website and will use this platform to provide relevant and timely information of interest to both our partners and members.  Please feel free to contact myself or Jimie Wheeler regarding any and all aspects of concrete pavement utilization in the State of Illinois.  With the new funding levels on the horizon, it will be an exciting time.


Michael E. Ayers, Ph.D.

Executive Director

Illinois Chapter, American Concrete Pavement Association 

Pavement Rehabilitation with Unbonded Concrete Overlays

Article originally published in the Spring-Summer 2016 edition of the Colorado Public Works Journal

As noted in the May 2014 “Guide to Concrete Overlays” published by the National Concrete Pavement Technology Center (CP Tech Center), shrinking budgets and ever-increasing traffic volumes have necessitated the immediate need for engineering strategies to preserve and maintain the nation’s roadways. One such approach is an unbonded concrete overlay.

Unbonded concrete overlays are used to restore structural capacity to existing pavements ranging from moderately to significantly deteriorated. The term “unbonded” simply means that bonding between the overlay and the underlying pavement is not needed to achieve desired performance. Thus, the overlay performs as new pavement and the existing pavement provides a stable base.

Source: “Guide to Concrete Overlays: Sustainable Solutions for Resurfacing and Rehabilitating Existing Pavements” (www.cptechcenter.org)

There are several benefits of using unbonded concrete overlays, including the solution’s cost-effectiveness. According to the CP Tech Center, “dollar for dollar, they are one of the most effective long-term pavement preservation and major rehabilitation options for existing pavements.” Other benefits of unbonded concrete overlays include their quick construction, ease of maintenance, and sustainability assets.

In general, unbonded resurfacing is highly reliable, offering longer design life than road rehabilitation with asphalt. It has been used successfully by several states, providing on average more than 30 years of good-to-excellent performance, according to the CP Tech Center.

Innovative methods of construction are continuously being explored, and Route D south of Kansas City, MO was the first in the nation to use a fabric bond breaker in 2008. The 3.7 mile long unbonded overlay was constructed in 50 days with a 5” minimum concrete thickness and 6’ x 6’ jointing on a 24’ wide road carrying 9,300 ADT (5% trucks). The new surface has now been serving the traveling public for 8 years, and a 2015 visual distress survey demonstrated that it is performing extremely well.

The IL Chapter of ACPA can provide further education on material considerations for long-lasting concrete overlays, and will gladly review potential projects to identify which option(s) are best for your situation. For more information, please contact us.