Asphalt Rubber Technology Information Center
Discarded Tires in Highway Construction - Construction Report
Author(s):
Mellott, Dale, Pennsylvania DOT  
Origin:
Pennsylvania  
Date:
May, 1981  
Categories:
Performance  
Key Words:
SAMI, stress-absorbing, membrane interlayer, rubber-asphalt  
Summary:
This report covers the construction of two stress-absorbing membrane interlayer (SAMI) projects in Pennsylvania.  The
SAMI material consisted of either an AC-20 or H-1 class asphalt with 33 percent granulated, reclaim rubber added.  
Different contractors, using slightly different processes, applied the SAMI at the two sites.  Both project an additional two
inch layer of ID-2 binder course material was placed directly on the SAMI and beneath theID-2 wearing surface 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.
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