| Report No. | AKP14 (jot this number down to order) |
| Title | Fatigue Behavior of Rubber Modified Pavements |
| Authors | Raad, Lufti and Stephan Savounddjian |
| Publisher | |
| Pub. Date | May, 1997 |
| Pages | 95 pages |
| Keywords | fatigue, Asphalt-Rubber, PlusRide, stiffness |
| Description | Over the last 15 years, a number of rubberized pavement projects have been built in Alaska. Initial laboratory and field investigations sponsored by the Alaska Department of Transportation and Public Facilities (AKDOT & PF) and conducted by Raad er al. (1995) indicated improved fatigue performance of the rubberized sections in comparison with conventional asphalt concrete pavements. This report presents the results of a follow-up investigation to develop design equations for rubberized pavements in Alaska. Laboratory studies were conducted on field specimens using the flexural fatigue test in controlled-displacement mode. Specifically, the rubberized mixes included 1) Asphalt-Rubber concrete with AC-2.5 (wet process) and 2) PlusRide RUMAC with AC-5. Tests were performed for a range of temperatures varying between 22C and -29C. Fatigue relationships were developed in terms of repeated flexure strain, dynamic flexure stiffness of the mix, and repetitions to failure. In addition, relationships for the dynamic flexure stiffness as a function of temperature were also developed. The proposed fatigue equations were used ot compare the behavior of the rubberized mixes with conventional AC-5 mixes at 20C Asphalt-Rubber and AC-5 mixes exhibit essentially similar fatigue resistance, whereas PlusRide as the least fatigue life. However, at 0C, the fatigue resistance of PlusRide and Asphalt-Rubber exceed that of the conventional AC-5 mix. The fatigue equations were also used to compare the fatigue life of conventional and rubberized pavements for different surface layer temperatures and foundation support conditions. |
| Postage | $ 8.00 : U.S. $ 8.40 : Canada/Mexico $ 8.80 : Rest of the World |
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