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Density
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The density of finished geofoam is controlled during manufacture. The generic specification provided in this web page identifies EPS and XPS geofoam by a number that represents the commonly manufactured density as provided in ASTM-C-578. Geofoam density is a primary parameter for design and a useful index for correlation of physical properties and field experience. |
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Commonly used geofoam densities are in the range of 15 to 22 kg/m3 for light weight fill applications. For settlement and stability analysis, a nominal density of 100 kg/m3 can be used. This higher design value maintains a built margin to accommodate possible density increases due to moisture absorption over time. For buoyancy considerations, the geofoam weight may be ignored and a safety factor against uplift should be allowed for the design water level. In some cases, additional resistance to uplift under extreme flood conditions may be provided by foundation anchors. Higher densities are preferred for insulation purposes to obtain higher R-values, lower deformation and better resistance to R-value degradation by in service moisture absorption. |
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References |
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Aaboe, R., (2000). "Evidence of EPS Long Term Performance and Durability as a Light Weight Fill." Transportation Research Board, Washington, January, 2000. |
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Van Dorp, T., (1988). "Expanded Polystyrene Foam as Light Weight Fill and Foundation Material in Road Structures." Chemical Research Centre, Shell Louvain-la-Neuve, Belgium. |
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