·         The variation of density within the block decreases with decreasing the overall block density.

·         The variation of density between specimens is less for large specimens.

·         The loading rates affect the stresses reached on a specimen in a displacement control mode.

·         The lower the loading rate, the lower the stresses will be on the specimen at equivalent strain levels.

·         In displacement control mode the initial modulus value will change by changing the loading rate because of relaxation effects.

·         The post yield modulus will change by changing the loading rate because of relaxation effects.

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  Results from conventional 0.05m cube samples significantly underestimate Young's modulus values for EPS geofoam.

·         Commonly assumed Poisson's ratio values are lower than indicated by results from large samples and localized deformation measurement.

·         The main cause for the underestimation of both Young's moduli and Poisson's ratios is attributed to crushing and damage near the geofoam and rigid platen loading interfaces.

·         Detrimental crushing and damage was not indicated to occur at geofoam to geofoam interface boundaries.

·         Young's modulus and Poisson's ratio values determined by deformation observation over the middle third of a 0.6m test block provide improved estimates of parameters for better agreement between model prediction and actual geofoam fill performance.

·         EPS geofoam will stiffen slightly under repeated loading as long as the applied stress is around 30% of the strength at 5% strain.

·         EPS geofoam will soften under repeated loading under large applied stress values.

·         The deterioration of the stiffness of the EPS geofoam under repeated loading depends on the loading history of the specimen.

·         The strength of the material will not change at the 5% and the 10% strain when subjected to repeated loading.

·         The strength at 1% strain will change after pre loading if the previous loading exceeded a certain value.

·         EPS geofoam shows an anisotropic behavior if it is heavily preloaded in any direction.

·         EPS geofoam creep will be in the primary stage as long as it is subjected to stresses equal to the strength at 5% strain or less.