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GeoVoid® compressible fill material, an expanded polystyrene (EPS) product, is designed to act as a compressible medium reducing potential forces on structural slabs in the event soil expansion occurs after construction is completed. It can be distinguished from other EPS materials, not designed for this application, by its brown earth tone colour.
Soil deposits which contain substantial proportions of clay mineral particles can have significant potential for expansion. A soils investigation will identify the extent of soil expansion to be expected.
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Soil expansion may affect the performance of structural members, even when pile foundations have been used. The magnitude of soil expansion experienced will depend upon factors such as soil moisture loss during construction and new conditions imposed on the soil as a result of construction (e.g. changes in soil stress/temperature induced by the new structure and additional sources of moisture due to landscaping or other factors). GeoVoid compressible fill material acts as a compressible medium between the expansive soil and the structure to reduce long-term stresses transferred to the structure. The structural slab wall must be restrained from movement in the direction of soil expansion and designed to withstand long-term compressive stresses transferred through the compressible medium. On the long term, the compressible medium is designed to collapse in the event of soil swell without exceeding the design uplift capacity of the slab (see the Design Criteria in the Application section below).
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To view the design manual document on GeoVoid Compressible Fill, Click Here
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