Abstract
Studies on the use of expanded polystyrene (EPS) as a lightweight embankment sub-base material began in Germany in the 1980s. This paper describes full-scale model studies carried out with the testing facilities of the German Federal Highway Research Institute (Bundesanstalt für Straβenwesen, BASt) and the additional deformation studies carried out at BASF. The BASt studies allow a comparison of various pavement structures on top of the EPS layers, from which general recommendations for the thickness of the pavement layers as function of traffic load can be derived. EPS was first used in Germany in March 1995 in an abutment fill during construction of a freeway. The knowledge obtained will also be reported. In parallel to these studies, a working committee within the Highway and Traffic Research Society (Forschungsgesellschaft für Straβen- und Verkehrswesen, FGSV) has drawn up a code of practice on the use of rigid EPS foams in the construction of road embarkments. This paper also discusses the most important points in this code of practice concerning different cross-sections of structures using EPS, thickness guidelines and quality control methods.
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