Compression and Density
POLYROCK® is a thermoplastic material that under compressive loads acts in a viscoelastic manner. This means that above certain levels of compressive loads, POLYROCK® will not recover all of its original thickness when the load is removed. Typically, POLYROCK®'s compressive stress at 10% strain is the quoted performance characteristic, even though this is well into the region of permanent deformation.
To select the correct POLYROCK® density, the elastic region of the compressive strength versus stress curve is of interest. The designer must ensure that the short term design load combination (e.g dynamic traffic loadings) is less than 1% of the initial compressive strain indicated for the chosen density.
POLYROCK®'s most important characteristic is its very low density. Typically densities range from 15/kgm³ to 28kg/m³ although these densities can be customised for specific applications. Selecting the correct POLYROCK® density is primarily based on the compressive loads that will be applied during its service life.
For more information and technical assistance please contact Aimee Marsh 0274 783 616
Brochures
Uses in Construction
Abutment Backfill
To reduce lateral pressure and differential settlements at bridge abutments
Hillside Roading
Construction of hillside roading embankments in steep terrain.
Lightweight Fill
For the protection of existing services such as stormwater or sewerage pipe systems
Road Embarkments
Reduce loads on subsoil compared to conventional embankments. This is the most common application in New Zealand for POLYROCK® so far.
