Geosynthetic Soil Stabilization Confinement Neoloy Geocells and Geogrids

Leading researchers in Holland, USA and India have conducted field trials for geosynthetics reinforcement of road bases. Test data based on deformation, stiffness and reinforcement factors for Neoloy Geocells consistently show higher results for Neoloy Geocells vs. geogrids, in addition to their ability to utilize marginal materials for infill. Hybrid solutions combining geogrids on the subgrade layer and Neoloy Geocells in the base layer have also proven highly effective.

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Bearing Capacity Improvement of Gravel Base Layers in Road Constructions Using Geocells

Comparative testing demonstrated that Neoloy® Geocells can improve layer modulus by up to 10 per cent. Studies by Meyer and Emersleben evaluated how the geocell reinforcement mechanisms work, and describe the improved geotechnical engineering forces provided by the soil-cell composite structure. Results from full- scale field testing validated the results achieved in plate box test testing. Neoloy Geocells increased load bearing capacity by 5x, reduced differential settlement by up to 80% and decreased vertical stresses by more than 40%; in addition the performance of a 40 cm Neoloy Geocell reinforced base layer equaled a 70 cm unreinforced layer with high quality aggregate.

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The Use of Geocells in Road Constructions Over Soft Soil: Vertical Stress and Falling Weight Deflectometer Measurements

Large-scale tests demonstrated that Neoloy® Geocells increase bearing capacity, reduce vertical stress over soft soils. Neoloy Geocells provide a stiffer layer which distributes the loads over a wider area and reduce the stress on the subgrade layer. The increased soil modulus allows you to save ~30% of the asphalt layer and greatly reduce the overall pavement thickness.

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Amtrak rail stabilization project with Neoloy Geocells

Studies of Neoloy Geocell Stabilization of Railway Tracks, Ballast and Embankments Extensive technical papers include Palese, Zarembski (et al) published results of extensive monitoring of an Amtrak rail stabilization project with Neoloy Geocells that showed a 7x reduction in track maintenance; Kief’s published results of hybrid reinforcement projects showing how Neoloy Geocells reduce heaving of expansive clay soils; and B. Leshchinsky and Ling’s published research on loading tests and numerical analyses of model rail embankments that demonstrated Neoloy Geocells cut vertical deformation and lateral displacement by >50% and increase track stiffness by >160%.

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Geocell and Geogrid Performance

Geocells were originally used to reinforce base layers over soft cells. But this study, published in Geosynthetics India, provides academic proof that NPA Geocells are also highly effective in upper base layers. Building on studies by Han, Pokharel and others, which demonstrate that NPA Geocell-reinforced bases have a significantly higher performance than unreinforced bases, this study shows that an NPA-Geocell reinforced layer has a modulus improvement factor of 2.75. Field plate load tests and a demonstration project, revealed that NPA Geocells significantly reduce construction and maintenance costs.

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Geogrid Trial Road Base

NPA Geocell Reduction Factor (RF) Compared to Geogrids NPA geocell pavement reduction factor exceeded the test values for geogrids by 30-40% in a controlled field trial of stiffness and deformation for road bases with 7 leading geogrids. Leading researchers in Holland, USA and India have conducted field trials for geosynthetics reinforcement of road bases. Test data based on deformation, stiffness and reinforcement factors for Neoloy Geocells consistently show higher results for Neoloy Geocells vs. geogrids, in addition to their ability to utilize marginal materials for infill. Hybrid solutions combining geogrids on the subgrade layer and Neoloy Geocells in the base layer have also proven highly effective.

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Geocells Improve Seismic Reduction Factors of Retention Walls

Leshchinsky (et al) testing of PRS geocell earth retention walls at the National Seismic Research Institute in Japan concluded that geocells can be used successfully for walls even under very high seismic loads (reduction factor of 0.3 – 0.4). The studies noted that geocells made from HDPE are unsuitable for long-term applications, and guidelines were given to PRS to further its development of its Neoloy based Geocell for demanding applications requiring long-term performance.

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