These studies published in a number of papers have thoroughly evaluated the use of PRS-Neoweb™ geocells for reinforcement of flexible structural pavements. Extensive testing was carried out in the laboratory with plate loading of geocells in large scale test boxes, in addition to a number of large field installations in actual roadway constructions were carried with pressure cell instrumentation and monitoring. The studies evaluated how the geocell reinforcement mechanisms work, and describe the improved geotechnical engineering forces provided by the soil-cell composite structure. Results from comparative field tests – including full- scale field testing based cyclical dynamic loadings – validated the results achieved in laboratory plate box test testing. PRS-Neoweb increased the load bearing capacity of the soil by a factor of 5, reduced differential settlement by up to 80% and decreased vertical stresses in the soft subgrade by more than 40%. Additional plate loading test box studies demonstrated that geocells increase the bearing capacity of the soil and reduce the vertical stress on subgrades by >30-45%. Measurements showed that the performance of a 40 cm PRS-Neoweb reinforced base layer equaled a 70 cm unreinforced high quality aggregate layer.

 

The Influence of Hoop Stresses and Earth Resistance on the Geocell Reinforcement Mechanism, GIGSA GeoAfrica (2009) South Africa.

Evaluation of geocell reinforcement mechanisms demonstrates that the stiffness of the geocell material is the most important confinement parameter, and validates the results of earlier vertical load testing.

Bearing Capacity Improvement of Gravel Base Layers in Road Constructions using PRS-Neoweb, (IACMAG), (2009), Goa, India

Results from lab plate box test and in-situ asphalt pavements (Road K-23) show that PRS-Neoweb decreased vertical stresses by 30%, reduced deflections on the asphalt service by15% and the back-calculated layer modulus increased by 10%.

The Use of Geocells in Road constructions over Soft Soil: Vertical Stress and Falling Weight Deflectometer Measurements, EuroGeo4, Edinburgh, Scotland, (2008).

Field and lab tests showed that PRS-Neoweb increases load bearing capacity of infill soil x 3, while vertical stresses were reduced in soft subgrade by 30-36%. The performance of 40 cm PRS-Neoweb reinforced layer with medium grade infill was equal to a 70 cm unreinforced high quality aggregate layer.

Bearing Capacity Improvement of Asphalt Paved Road Construction Due to the Use of Geocells, 4th Asian Regional Conference on Geosynthetics, Shanghai, China, (2008).

Vehicle crossing tests (vertical stress measurements) and FWD measurements of comparative soil stabilization techniques in Road K-637 demonstrated that PRS-Neoweb significantly improved asphalt pavement bearing capacity, in agreement with lab testing and road tests.