GeoFoam is manufactured from inert closed cell expanded polystyrene (EPS). GeoFoam is generally defined as a foam material used as lightweight fill in geotechnical applications to reduce settlement and/ or enhance soil stability. Using GeoFoam as a soil replacement can permit the construction of large volume earth structures like highway and railroad embankments over soils of low bearing capacity. GeoFoam can also be used as a compressible inclusion under concrete and earth structures. GeoFoam has excellent vibration damping and thermal insulation properties.
It is resistant to freeze/thaw and has low moisture absorption properties.
It is not biodegradable and has no pest or mould nutrient value.
Material arrives ready to place, no weather delays.
Material can be prefabricated or cut at the jobsite, no staging required.
Lightweight product, easy to handle. No heavy equipment for placing needed.
GeoFoam can be used as a lightweight substitution for soil fill in road or railway embankments, retaining wall, seating of sport stadiums and abutment backfill, slope stabilization and other areas where the subgrade is weak and cannot support anticipated loads using standard fill materials. Since GeoFoam is 50 to 100 times lighter than soils, its use can decrease overburden stress and excessive settlement, and prevent large earth structures such as bunt-up bridge ramps and highways built on side slopes from shifting, sliding or compressing underlying ground. In the rehabilitation of failed slopes and side hills, replacing some of the original soil with GeoFoam can significantly reduce vertical stresses and lateral forces on structures and retaining walls, eliminating additional settlement. GeoFoam can be also used to build vertically faced self-supporting walls in conjunction with weight reduction and relief of lateral earth pressures. GeoFoam can be used to reduce the weight on underground structures like pedestrian -, road - and rail underpasses, and tunnel systems for subway transportation and utility corridors.
Protection of Structures from Expansive Subgrades
Some clay-based soils and freeze-thaw activity can exert high levels of upward strain against on-grade structures. GeoFoam can be used to form voids under grade beams and pile caps to prevent lifting or fracturing of the structure. GeoFoam, like all solid foam products, does not collapse, and therefore exerts an ever-increasing level of force against concrete structures as soil expansion occurs.
Buried pipe, culverts, ducts, retaining walls and other belowgrade concrete structures can be protected from high levels of earth pressure through the use of the controlled yielding properties of GeoFoam. At-rest soil pressure can be reduced to the active state by installing a compressible inclusion between the structure and the earth fill. The controlled yielding ability of GeoFoam allows the retained soil to mobilize its shear strength sufficiently to achieve the active state. Excessive soil compaction induced stresses can also be reduced through the use of GeoFoam. GeoFoam is an excellent thermal insulation. Using GeoFoam as insulation may reduce depth requirements for protecting pipelines from frost.
In Construction of marinas or in many other marine applications, the buoyancy of EPS can support more weight than alternative materials. A cubic metre of EPS with a density of only 16 kg/M3 has a buoyancy of 984 kg!
Empty enclosures can be punctured and lose buoyancy; - a fill of EPS prevents sinking so long as the EPS stays in place.
Specification’s and Compliance’s
The density of GeoFoam should be carefully considered in order to assure appropriateness for the use intended.
Health and the Environment
EPS contains no CFCs, HCFCs, or other gases harmful to the atmosphere ozone level. It is non-fibrous, non-toxic, hypo-allergenic, and will not irritate sensitive skin on exposure.
Sizes and Densities available
GeoFoam is available in densities of: 13, 16, 19, 22, 25, 28, 31 kg/m3. It is produced in block form, with a standard size of 1.000 x 1.200 x 3.000mm. Sheet sizes are available within the standard size.
Laying the blocks
GeoFoam in each layer should be laid with broken joints; there should be no vertical or horizontal joints running through the construction.
GeoFoam which require trimming can be easily cut using a hot-wire cutter, handsaw or chain saw.
GeoFoam should be protected from possible accidental contact with petroleum or solvents using a suitable polymer barrier.
Fill or capping layer
The final fill should be placed over the GeoFoam , taking care not to puncture any membrane. No con-struction plant, other than compaction equipment, should be driven across, or placed on the GeoFoam until there is a minimum cover of 200mm of accept-able fill material, or until the capping layer has been placed.
The sides of the GeoFoam blocks should be covered with general fill and compacted in layers. The sides should be graded and covered with top soil. The minimum cover should be 300mm.