Neoloy® Tough Cells- Unique and Proven Engineering

Neoloy® Tough Cells enable the highest performance and value

Although the runners in a marathon start together, their performances differ as the race goes on. The same is true for geocells.

Geocells must retain their performance over time, e.g., maintain their 3D geometry (dimensional stability), for the reinforcement mechanisms (wall stiffness, beam effect and elastic modulus) to function. Deviation in geocell geometry will weaken the pavement and cause fatigue failure. 

The unique Neoloy® polymer alloy provides the Neoloy Tough Cells with the optimal combination of strength, stiffness and durability. Neoloy maintains its stiffness and geometry for the geotechnical project lifespan under dynamic loading, thermal cycling and high temperatures. Pavement layers and subgrade reinforced by Neoloy Tough Cells improve the level of pavement stability and uniformity, thereby increasing the performance and life of the pavement. 

The result? Neoloy enable SIGNIFICANT SAVINGS IN CONSTRUCTION RESOURCES 

Significantly less road repairs and rehabilitation which lead to the lowest construction time, earth works, faster installation and making the road more sustainable and economical.  

The high modulus Neoloy Tough Cells have been calibrated for use with today’s mechanistic empirical models (MEPDG) for road design (e.g., AASHTO Roadside Design Guide). Neoloy’s long-term strength makes it a “perpetual geocell”, suitable for the base of perpetual pavements and perpetual railway superstructures. 

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Neoloy’s Unique Properties Lead to Key Performance Benefits

  • Stiff and Strong – very high tensile strength, up to 28 MPa, prevents fatigue 
  • Confinement – increases pavement layer strength (modulus) regardless of bearing capacity (CBR) 
  • Reinforcement – reduces layer thickness and wearing course by up to 50% 
  • Beam effect – improves load transfer and bearing capacity by up to 50% 
  • Improves elastic modulus – by factor of 2-5 for heavier traffic and longer pavement lifespan 
  • Simple logistics – and fast all-weather installation 
  • Lowest costs – of infill, compaction, construction 
  • Reduce maintenance – repairs, maintenance cycles and downtime 
  • Extended lifespan – lowers life cycle costs and suitable for perpetual pavements 
  • Lowest grade infill – Use locally available, ungraded or recycled materials for infill 
  • Reduce pollution – quarrying, hauling, fuel, pollution, carbon footprint 
  • Greenest – sustainable construction method
  • Patented technology – provides very high stiffness, dimensional stability, creep resistance 
  • Durable – long-term performance under heavy dynamic loading 
  • Unique engineering – suitable for very perpetual pavements 
  • Highest performance– outperforms any other HDPE geocell 

Neoloy Geocells® enable cost-effective drainage and containment solutions for airports to dispose of stormwater runoff safely and ecologically

Geotechnical Project Design

Proven Design Methodology Validated by Field Tests, Published Research, International Standards

Neoloy® is revolutionizing the use of geocells for engineers and contractors. How? Because the rigid Neoloy® Tough-Cells are manufactured in several different categories according to strength and other design factors. Now you can select the Neoloy type that fits the project requirements. The result is best suited performance at optimal cost, no matter which project type. PRS offers: 

  • Established design methods – Extensive R&D with Neoloy included calibration of design methods for use in unpaved roads (modified Giroud and Han method) and paved roads (layered elastic model method) integrating the Neoloy Tough-Cells factors (modulus improvement factor (MIF). 
  • New specifications and standards – PRS developed new performance based specs that align with the requirements of international standards and accurately reflect the performance of rigid geocells in the field than older methods. 
  • Engineering consulting – as an engineering and technology company, PRS provides geotechnical engineering and design services to you maximize the cost-effectiveness of Neoloy in each project. 
  • New Neoloy categories – PRS developed three categories of Tough-Cells according to the application type. This enables optimization of the geocell by matching the tensile strength and durability of Neoloy to the project requirements. 

Neoloy’s Unique Properties Lead to Key Performance Benefits

  • Highest elastic and dynamic performance, proven by ISO 
  • Lowest deformation levels for long-term, proven by ASTM 
  • Modulus Improvement Factor (MIF) allows more traffic and extended lifespan
  • Simple logistics and the fastest all-weather installation 
  • Lowest construction, infill costs 
  • Reduce repairs, maintenance and downtime 
  • Use locally available, ungraded or recycled materials for infill 
  • Reduce quarrying, hauling, fuel, pollution, carbon footprint 
  • The greenest sustainable construction method 
  • Provides the highest stiffness, dimensional stability, creep resistance 
  • The Longest -term performance under heavy dynamic loading 
  • Outperforms any other HDPE Soft-Cell 

Neoloy Geocells® enable cost-effective drainage and containment solutions for airports to dispose of stormwater runoff safely and ecologically

Beam Effect

Semi-Rigid Neoloy® Tough Cells Strengthen Soft Soils

Neoloy enables the use of local sand by making it stronger than gravel, and also allows the use of recycled asphalt and concrete – making them as strong as semi-bound materials. 

Vertical loading on Neoloy Geocells infilled with compacted granular material creates a semi-rigid slab or “beam effect” over soft soils, as shown in the figure below. Also known as the tensioned membrane effect, this refers to the tension developed in the curved geocell-reinforced mattress to resist the vertical load (Rajagopal, et al 1999). 

This effect, however, is dependent upon significant deformation of the pavement structure (Han 2004). As the geocell-reinforced section is stiffer than the surrounding soil, the curved surface exerts upward reaction and reduces the net stress to the subgrade (Pokharel 2010). The beam effect distributes the load evenly and effectively over a wider area, thereby increasing bearing capacity and decreasing differential settlement. 

The zone of influence created by the geocell is higher than the cell wall height. The beam effect on the PRS-Neoloy reinforced base was verified in lab studies and field tests by Han et al, 2011, and Kief and Rajagopal 2011. 

Neoloy’s Unique Properties Lead to Key Performance Benefits

  • Improve load transfer 
  • Reduces vertical stress to subgrade 
  • Reduces differential settlement 
  • Increases bearing capacity 
  • Improves dimensional stability of cells 
  • Allows the highest traffic and loads 
  • The highest pavement lifespan 
  • The lowest maintenance 

Neoloy Geocells® enable cost-effective drainage and containment solutions for airports to dispose of stormwater runoff safely and ecologically

Design Checklists

PRS engineers are here to support your project – ensuring the best results and the highest quality.

Unpaved Roads – Sand/Gravel Design Form

Neoloy® Tough Cells optimize project resources and costs of unpaved, gravel and sand roads while lowering maintenance costs (Get a Design). 

Paved Roads Design Form

Neoloy® Tough Cells mechanically stabilize the base and sub-base layers of a paved road to keep low deformation level with the high Neoloy stiffness (<2% permanent deformation, ASTM D6992) (Get a Design). 

Channel Protection Design Form

The high dynamic-modulus 3D Neoloy® Tough Cells protection absorbs dynamic energy while maintaining the stability of the surface cover. This achieves a reliable and durable solution that prevents erosion and slope failures and eliminates flood events (Get a Design). 

Retaining Walls Design Form

PRS Neoloy® Tough Cells walls are durable and green earth retention walls with low creep <3% for more than 75 years. Ideal for steep, unstable slopes and maximize site development (Get a design). 

Slope Protection Design Form

PRS Neoloy® Tough Cells hold the soil in place against soil sliding forces. The cells act as a 3D mechanical stabilizer, and the high Neoloy stiffness guarantees low permanent deformation (<2%, ASTM D6992) to keep the cells and infill material in place (Get a design). 

Your Success Starts Here. Contact Us to Evaluate Neoloy Tough-Cells Solution

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