Fiber Additives in Asphalt Mixtures

The report documents the current state of the practice regarding the use of fiber additives in asphalt mixtures. It outlines the many types of fibers that have been used, their properties and how they are tested, mix design tests for fiber mixes, the types of applications in which fibers have been used, and lab and performance of fiber mixes. This synthesis can aid state asphalt engineers and researchers on the use of fibers. A literature review and detailed survey responses from 48 of 50 state agencies, yielding a response rate of 96%, are provided. Also, six case examples offer more detailed information on the use of fibers.