Asphalt rubber interplayer benefits on reflective crack retardation of flexible pavement overlays
Shatnawi, Shakir; Pais, Jorge; Minhoto, Manuel; Southern African Transport Conference (30th : 2011 : Pretoria, South Africa); Transportation Research Board of the National Academies (TRB); Minister of Transport, South Africa
Paper presented at the 30th Annual Southern African Transport Conference 11-14 July 2011 "Africa on the Move", CSIR International Convention Centre, Pretoria, South Africa.
This paper provides an overview of the asphalt rubber interlayer benefits on reflective
crack retardation in flexible pavement preservation and rehabilitation strategies. These
interlayers are known in California as asphalt rubber absorbing membrane interlayers
(SAMI-R) or as asphalt rubber aggregate membrane interlayers (ARAM-I) chip seals.
These interlayers have been used successfully as part of cape seals and as part of an
overlay system. The paper focuses on the performance in terms of field project reviews,
laboratory performance tests and finite element analysis. The paper concluded that SAMIR are effective in minimizing reflective cracking distress and in extending pavement life.
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