Effectiveness of Pavement Preservation Techniques

Project status

In progress

Start date: 08/17/16
End date: 07/31/18


Principal investigator:

Co-principal investigators:

About the research

Pavement preservation has shown to improve pavement performance and the desire to maximize Iowa’s infrastructure investment has augmented the need to better document and understand the effectiveness of pavement preservation techniques on Iowa roadways. Pavement preservation research requires immediately implementable results that can move activities like chip sealing or dowel bar retrofits from stop-gap categories and clearly demonstrate their effectiveness in enhancing a pavement’s ride quality, delaying deterioration, and being cost-effective strategies.

Pavement preservation performance extends beyond research to a movement that seeks to cost-effectively delay pavement deterioration through proactively addressing pavement imperfections before a substantial decrease in serviceability. Iowa has actively used pavement preservation methods as a way to extend pavement service life on both PCC and HMA pavements. Improved understanding of pavement preservation techniques for both portland cement concrete (PCC) and hot-mix asphalt (HMA) is needed with a focus on pavement performance over time, the cost-effectiveness of preservation strategies, and an effectiveness index that can be used to objectively evaluate preservation strategies.

This research aims to improve the understanding of pavement preservation strategies by focusing on three key areas:

  • Documenting the effectiveness using both qualitative and quantitative metrics
  • Understanding the important factors that influence the performance of pavement preservation strategies
  • Developing guidance for selecting pavement preservation techniques considering cost, roadway characteristics such as traffic, and roadway condition


Sponsor(s): Iowa Department of Transportation