Chip Seal Design and Specifications

Project status

In progress

Start date: 07/18/14
End date: 11/28/18


Principal investigator:

Co-principal investigators:

About the research

With the high price of asphalt products and the strong commitment by the Oregon Department of Transportation (ODOT) to provide sustainable design solutions to the state's construction and maintenance projects, chip seals will replace thin asphalt overlays in much of the state's pavement preservation program. The result is a more cost-effective treatment that minimizes the amount of virgin material required and greatly reduces the carbon footprint of the typical resurfacing job. In many cases, the chip seal's increased surface macrotexture will also enhance safety by providing enhanced surface drainage to remove more water from the traveled way faster than hot-mix asphalt surfaces.
The objective of this research is to document methods and report the performance of chip seals designed using different methodologies. Once quantified, the research will identify best practices that can be implemented.
Implementation Phase (Phase II): 06/29/2017-11/28/2018



  • Federal Highway Administration State Planning and Research Funding
  • Oregon Department of Transportation