To select, build, and study 12 lanes of pavement and test using the FHWA Accelerated Loading Facility (ALF) machines. Experiment is focused on developing field performance data on hot-mix asphalt mixtures wiht modified binders. This is an important step in a larger program to refine the Superpave brinder specification for the modified materials. Secondary goals include: 1) early trial of the proposed 2002 Pavement Design Guide; 2) evaluation of crumb-rubber modified asphalt pavements; 3) correlation of field performance withi results of laboratory tests, e.g., the Superpave Simple Performance Test.

Additional Study Partners: CT, FL, IL, IN, KS, MD, MI, MS, MT, NE, NV, NJ, NM, NY, TX. Total Commitments Received: $1,259,000 TPF-5(019) is the full-scale accelerated performance testing for Superpave and structural validation study in which 12 asphalt test lanes containing various modified binders were constructed at FHWAs Accelerated Loading Facility. SPR-2(174) was originally written as a project to conduct accelerated pavement testing of crumb rubber modified asphalt pavements. The objectives of SPR-2(174) have been folded into the broader scope of TPF-5(019), and two of the test lanes contain rubber. The agencies and industry representing contributors to TPF-5(019) and SPR-2(174) form one technical advisory committee (TAC). The most recent meeting of the TAC was held on February 3-4, 2004 at Turner-Fairbank Highway Research Center. Recent project activities and results were discussed. Each of the 12 lanes has been trafficked for rutting. The trafficking for fatigue has just started. Laboratory binder and mixture tests to assess rutting performance have been conducted. Also discussed was an approach to use the performance data and the materials testing data from this study to validate the mechanistic-empirical models developed under NCHRP 1-37A. (updated: 2/23/04).