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Neoweb
PRS-Neoweb is a cellular confinement system (geocell) developed and manufactured by PRS Mediterranean Ltd. Composed of ultrasonically welded strips, the Neoweb geocell is opened up on-site to a form a 3D honeycomb-like matrix, and then infilled with soil material to stabilize and reinforce soil. In addition to the reinforcement of the subgrade, subbase or base layer of roads and railways, cellular confinement is also used for soil stabilization and erosion control in slopes, channels, retention walls, reservoirs and landfills.
Neoweb is manufactured from Neoloy, a novel polymeric alloy (NPA), which provides a higher modulus, creep resistance and tensile strength to geocells than commonly available HDPE (High-density polyethylene)(Pokharel, et al., 2009).〔Pokharel, S.K. , Han J., Leshchinsky, D., Parsons, R.L., Halahmi, I. (2009). "Experimental Evaluation of Influence Factors for Single Geocell-Reinforced Sand," Transportation Research Board (TRB) Annual Meeting, Washington, D.C., January 11–15〕 Research has shown a stiffer geocell wall retains the cell geometry (dimensional stability) better and therefore confinement and reinforcement.〔Pokharel, S.K., Han, J., Manandhar, C., Yang, X.M., Leshchinsky, D., Halahmi, I., and Parsons, R.L. (2011). "Accelerated Pavement Testing of Geocell-Reinforced Unpaved Roads over Weak Subgrade," Journal of Transportation Research Board, the 10th International Conference on Low-Volume Roads, July 24–27, Lake Buena Vista, Florida, USA"〕 Neoweb is a sustainable solution for road construction as it enables the use of locally available but marginal soils for infill, thereby saving virgin aggregate; reduces the pavement layer thicknesses; and extends the service life of pavements, and thereby lowers operating and maintenance costs.〔Thakur, J.K., Han, J., Leshchinsky D., Halahmi, I., and Parsons, R.L. (2010), "Creep Deformation of Unreinforced and Geocell-reinforced Recycled Asphalt Pavements." Advances in Geotechnical Engineering, Geotechnical Special Publication No. 211, Proceedings of GeoFrontiers 2011, Han J. and Alzomora, D.E. (editors), Dallas, Texas, March 13–16, 4723-4732〕
==History==
The geocell concept was originally developed by the US Army Corps of Engineers in the 1970s as "sand-grids" to improve the soft subgrades of unpaved roads for short-term use by heavy military vehicles (Webster and Alford, 1977).〔Webster, S.L. & Watkins J.E. 1977, Investigation of Construction Techniques for Tactical Bridge Approach Roads Across Soft Ground. Soils and Pavements Laboratory, U.S. Army Corps of Engineers Waterways Experiment Station, Vicksburg, MS, Technical Report S771, September 1977.〕 Subsequent production of geocells for civilian use began several years later, using HDPE, for slope stabilization and erosion control and in temporary and low volume roads. PRS Mediterranean (est. 1996) began manufacture of the Neoweb brand of geocells. However, in order to improve the stiffness and long-term durability suitable to long-term use〔Leshchinsky, D. (2009) "Research and Innovation: Seismic Performance of Various Geocell Earth-retention Systems," Geosysnthetics, No. 27, No. 4, 46-52〕 PRS developed Neoloy, a novel polymeric alloy (NPA), based on a polyolefin matrix reinforced by polyamide nano-fibers. This NPA, as is it is termed in the research literature〔Han, J., Pokharel, S.K., Yang, X. and Thakur, J. (2011). "Unpaved Roads: Tough Cell – Geosynthetic Reinforcement Shows Strong Promise." Roads and Bridges. July, 49 (7), 40-43〕〔Yang, X., Han, J., Pokharel, S.K., Manandhar, C., Parsons, R.L., Leshchinsky, D., and Halahmi, I. (2011)." Accelerated Pavement Testing of Unpaved Roads with Geocell-Reinforced Sand Bases", Transportation Research Board (TRB) Annual Meeting, Washington, D.C., January 23–27〕〔Pokharel, S.K., J. Han, R.L. Parsons, Qian, Y., D. Leshchinsky, and I. Halahmi (2009). "Experimental Study on Bearing Capacity of Geocell-Reinforced Bases," 8th International Conference on Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, June 29 - July 2,〕 is used to create a multi-layered geocell featuring durable outer layers in between a high strength inner core layer for optimal performance. Geocells made from Neoloy are suitable for long-term structural reinforcement in critical applications such as the structural pavements, embankments and high retention walls.
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