Crumb Rubber Modified Asphalt Concrete in Oregon, Summary Report Author(s): Hunt, Elizabeth and Peters, Wendy Origin: Oregon Date: July, 1995 Categories: Performance Key Words: Pavement, asphalt, admixtures, rubber, ground tires Summary: Over the last nine years, the Oregon DOT has constructed 13 projects using crumb rubber modifiers in asphalt concrete pavements using both the wet and dry process. Three of the projects included more than one type of crumb rubber modifier. All projects included a control section. Research data has been collected on the majority of projects and five construction reports have been written detailing the results. State and federal legislation may require the use of recycled rubber in asphalt concrete; therefore, the Oregon DOT is interested in determining the most cost-effective rubber modified asphalt concrete. This report includes a literature review on the use of crumb rubber modifiers in asphalt concrete pavement; a review on non-ODOT CRM paving projects constructed by Oregon counties and cities; and the Washington DOT. In addition, the report summarizes the date collected on all CRM hot mix asphalt concrete pavement projects constructed by ODOT.