Discarded Tires in Highway Construction (Demonstration Project No. 37)

摘要

The report covers the performance of two stress-absorbing membrane interlayer (SAMI) projects in Pennsylvania. The SAMI material consists of either an AC-20 or H-1 class asphalt with 33% granulated, reclaimed rubber added. Different contractors, using slightly different processes, applied SAMI at the two sites. Both projects consisted of base repair, a leveling course, SAMI, and one and one-half inches of ID-2 wearing surface course material. However, on one project an additional two-inch layer of ID-2 binder course material was placed directly on the SAMI and beneath the ID-2 wearing course material. These projects had control sections that were constructed without SAMI for comparison purposes. These control sections were selected and placed randomly throughout the project. Because of the increased cost of the materials and the insignificantly increased service life, the use of SAMI is not economically justified.