Geocells Comparision with Geogrids

Geocells Technology, geocell technology
What are the relevant tests to determine geocells performance for the entire design life?
June 22, 2017
geocell reinforcement sustainabilty
Geocells
January 7, 2018

Neoloy Geocells stabilize soft subgrade, reinforce the road base and reduces degradation of the surface layer. Neoloy Geocells are an example of an innovative technology that improves road and rail construction, makes them sustainable and reduces costs – particularly in problematic soils, difficult locations and where aggregate is expensive.

NEOLOY ADVANTAGES OVER GEOGRIDS:

  • 3D larger fully and partially confined zones of influence – more reinforcement
  • External confinement better minimizes movement of soil in 3 directions
  • Neoloy creates a beam effect that greatly increases bearing capacity
  • Enables use of inferior and recycled infill materials
  • Save infill costs by utilizing less-expensive, available granular infill
  • More sustainable solution than geogrids

Neoloy Geocells

PRS Neoloy Geocells are a 3D honeycomb matrix infilled with soil for soil stabilization. Neoloy Geocells confine infill materials, improve layer strength and enhance stabilization.

The high stiffness, creep resistance and tensile strength of Neoloy®, a novel polymeric alloy (NPA) provide Neoloy Geocells with engineering performance to do more with less. The 3D Neoloy Geocells reinforced mattress with a beam effect gives a much higher reinforcement factor while using any type of locally available granular infill.

Compared to 2D geosynthetic products, such as geogrids and geotextiles, Neoloy Geocell confinement minimizes the lateral movement of soil particles in three dimensions. This results in a more confinement, more stiffness and a higher modulus improvement factor. 

Neoloy Geocells Comparison with Geogrids

PARAMETER+C11:H20  NEOLOY GEOCELLS GEOGRIDS
  HYBRID SOLUTION  V Proven effective – Neoloy Geocells in upper layers with geogrid working platform on subgrade layer V Proven effective – Neoloy Geocells in upper layers with geogrid working platform on subgrade layer
  AGGREGATE INFILL V Uses wide range of infill, e.g., ungraded, low-strength, locally-available granular soils, sand, recycled materials (low cost) X Requires high-quality, well-graded, engineered fill to achieve interlock (requires hauling)
  CONFINEMENT ZONE
(particle movement and stress distribution)
V 3D large vertical confined zone and very wide stress distribution, high reinforcement factor X 2D grid – limited vertical confined zones and stress distribution – moderate reinforcement factor
  BEAM (SLAB) EFFECT V Verified Beam (Slab) Effect increases bearing capacity and reduces differential settlements X No Beam Effect
  MODULUS IMPROVEMENT FACTOR V Substantial improvement factor at low & high subgrade settlements – up to 5.0x X Negligible improvement factor at low subgrade settlements – 2x
  THICKNESS REDUCTION FACTOR V Up to 70% and more
(KIWI testing institute, Netherlands)
X Less than 45%
(KIWI testing institute, Netherlands)
  EXTEND LIFE-SPAN, REDUCE MAINTENANCE V Extends pavement lifespan by up to 10%, reduces maintenance X Not available
  COST-EFFECTIVENESS V Higher unit cost/m2 offset by higher performance and reinforcement factor;
Save infill costs by utilizing marginal quality, but locally available materials
X Lower unit cost/m2 but lower performance – but lower reinforcement factor;
Cannot use marginal quality soil infill – requires hauling
  SUSTAINABILITY V High – use locally-available marginal soils, sand, and recycled infill materials;
Reduces layer thickness up to 70%;
Reduces quarrying, hauling, fuel, pollution, carbon footprint;
X Low – requires specific size, quality, graded aggregate;
Less reduction of pavement layers’ thickness:
Limited reduction in quarrying, hauling, fuel, pollution, carbon footprint
  INSTALLATION V Moderate, but easy to install on soft soil, effective immediately without deformation V 1 layer is fast but may require 2-3 layers equivalency to geocell, hard to stretch on soft ground, requires high deformation to activate
  EFFECTIVENESS ON SOFT SOILS SOILS V Sand – effective, use sand for infill;
Expansive clay – highly effective
Peat – effective
X Sand –  partially effective, but cannot use sand for infill
Expansive clay – partially effective
Peat – effective

ENGINEERING, ENVIRONMENTAL & ECONOMIC BENEFITS

Engineering – Neoloy 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

Environmental – Neoloy Geocells can utilize locally available, ungraded, low-strength granular soils, sand and recycled asphalt (RAP) or construction waste.

Economic – geogrid road reinforcement requires specific and expensive granular materials (ballast, crushed stone and gravel), as fine grain, ungraded materials do not provide the required interlocking.

 

TESTED, CERTIFIED AND ACCREDITED

Comparative field trials vs. geogrids at the KIWA Institute, (Holland) proved that Neoloy Geocell thickness reduction factors (0.72) were literally off the charts compared to geogrids, exceeding the highest known values for geogrids

ABOUT PRS

PRS Geo-Technologies is the world’s leading supplier of cost-effective soil stabilization solutions. Combining unique, proprietary technology with specialized engineering expertise, PRS delivers proven solutions for load support, slope and channel protection, earth retention and reservoir and landfill applications. With a global network of fully owned subsidiaries and independent local distributors, PRS provides a full range of end-to-end support services. Since its establishment in 1996, PRS has implemented thousands of successful projects in over 70 countries worldwide.
Visit our website:  www.prs-med.com