Title: APPLICATION OF ASPHALT RUBBER ON NEW HIGHWAY PAVEMENT CONSTRUCTION
Abstract: Asphalt rubber has been used for many years as a stress-absorbing membrane (SAM) or stress-absorbing membrane interlayer (SAMI) for both rigid and flexible pavement overlay systems in Arizona with satisfactory performance. In 1977, a new experimental application of asphalt rubber was used to build a low-volume highway pavement between Dewey and I-17 on AZ-169. Several experimental pavement sections were placed. After four years of service, only two sections are still in excellent condition with no cracks or ruts observed to date. One section consisted of a cement-treated base and the other a lime-fly ash-treated base. Each section received a SAMI and a 1-in. wearing course. Other test sections failed, and constant patching is required to maintain a minimal level of service. Generally, cement-treated bases will always have shrinkage cracks that easily reflect through any asphalt concrete surface layer if without special treatment to retard crack propagation. A finite-element procedure was used as an aid in explaining why a SAMI can be used effectively to eliminate reflective cracks. It was found that SAMIs can significantly reduce crack tip stresses due to thermal and traffic loads and provide longer service life of the asphalt concrete surface layer. (Author)
Publication Year: 1982
Publication Date: 1982-01-01
Language: en
Type: article
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Cited By Count: 2
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