State of the art. II: Permanent strain response of unbound aggregates

The permanent strain behavior of unbound aggregates under repeated loading has been studied by many researchers over the years. A summarized review of the research into this area is given based on the literature available to date. Different views from various sources are outlined and discussed. A st ate of the art is presented regarding the factors affecting the permanent s train development in these materials and the modeling techniques available. This paper is the second of two companion papers discussing the current st ate of knowledge on the structural behavior of unbound aggregates. The resi lient properties of these materials Ne reviewed in detail in the first pape r.