A key difference between the PRS-Neoweb™ geocell and geogrid reinforcement in road construction is the thickness of the confined layer. The PRS-Neoweb 3D vertical zones of influence (full confinement) is at least 20 mm, whereas the geogrid reinforcement zone (interlock, not full confinement) is limited to 1-2 times the size of the granular material. PRS-Neoweb 3D confinement also minimizes lateral movement of soil better than geogrids.
Moreover, geogrid road reinforcement require specific and relatively expensive granular materials (ballast, crushed stone and gravel). They cannot reinforce fine grain “inferior” non-cohesive materials as there is no interlocking. PRS-Neoweb 3D confinement transforms the modulus of inferior (fine grained) fill to that of higher quality granular fill, such that they can be used for structural infill. This includes lower cost native soil, quarry waste, sand, and recycled construction waste.
PRS-Neoweb also creates a reinforced mattress with a beam effect with unbounded base material. Comparative tests of PRS-Neoweb vs. geogrids in road construction demonstrated that the PRS-Neoweb improvement factor was higher than any of the seven leading geogrids tested.
PRS-Neoweb’s dramatic impact on the thickness of structural pavements was demonstrated in field trials conducted by KOAC–NPC (Netherlands). PRS-Neoweb was the only geocell tested against 7 leading geogrids) and the only product tested with inferior aggregate infill.
Benefits of PRS-Neoweb vs. Geogrid Reinforcement
- 3D larger fully and partially confined zones of influence – more reinforcement
- 3D confinement better minimizes movement of soil in 3 directions
- PRS-Neoweb creates a beam effect that greatly increases bearing capactiy
- PRS-Neoweb confinement enables use of range of inferior and recycled infill materials
- Can utilize granular materials with average particle size from less than 20 to10 mm or less
- Save infill costs by utilizing less-expensive, available granular infill
- More sustainable solution than geogrids
- Economically advantageous
The mean road-base thickness reduction factor (CBR =1.5) for PRS-Neoweb was 0.73, using the CROW design methodology (see chart). This value exceeded all previously known values for geogrid reinforcement. Even after truncating the test limits to 0.5 (the highest known values for geogrids) PRS-Neoweb achieved the highest reduction factors of all tested geogrids.