​Why Choose Penteco To Supply & Design Your Ground Stabilization System?

EnviroGrid® 6" Geocell was chosen as the best option for the access road, as it provided a cost-effective and sustainable solution for this area where limited infill material options were available. Due to the effect on the structural coefficient of sand, EnviroGrid® not only allowed for the use of locally available sands, but also increased the structural number of the sand through its confinement abilities, which in turn, cut down on the amount of aggregate needed. The road was graded and compacted in order to prepare the sub-grade. The EnviroGrid® panels were installed over a non-woven geotextile that provided a separation layer between the sub-grade and geocell. The cells were then filled with locally available sandy soils.

Tight budgets and challenging soil conditions caused the engineers to consider options that would reduce the required thickness of materials. The original design called for 30 inches of aggregate subbase, 8 inches of cement stabilized base, capped with 24 inches of Portland cement concrete. The full system consisted of a non-woven geotextile fabric on top of the sub-grade, the EnviroGrid® layer, a cement stabilized base layer, and a Portland cement concrete cap. A 42% reduction in system depth from 62" to 36" was achieved by using the EnviroGrid® system. The sub-grade was prepared and materials were brought on site. A non-woven geotextile fabric was rolled out onto the prepared sub-grade. The EnviroGrid® was staked out with straight rebar and filled with sandy soil, leaving an overfill of 2" after compaction to achieve a depth of 10". A 4" drainage layer of #57 stone crushed aggregate was laid on top of the EnviroGrid®. The contractor came in with 8" cement-stabilized base and finished the system with 16" deep layer of Portland Cement Concrete. A bond breaking tack coat material was sprayed on between the two cement layers.

The project was installed completely by the owner of the rental equipment yard, showing the ease of installation of the EnviroGrid® system. The current sand layer was compacted as much as possible and a nonwoven geotextile was added as a separation layer along with a geogrid for extra reinforcement. EnviroGrid® with a cell depth of 6" was deployed, filled, and compacted with 8" of high-quality limestone. The entire project was completed in under 3 days with one man installing. Due to the remote area of this project, aggregate fill was at a cost of $50 per delivered ton. The alternative to EnviroGrid® was to use 18" of aggregate fill. The reduction from 18" to 8" of aggregate netted a savings of $50,000 to Dolphin Energy Equipment. They continue to run a high volume of heavy duty forklifts over this yard expansion, even during major rain events, with no rutting or disturbance of the surface.

EnviroGrid® 6" Geocell was chosen as the best option for the access road, as it provided a cost-effective and sustainable solution for this area where limited infill material options were available. Due to the effect on the structural coefficient of sand, EnviroGrid® not only allowed for the use of locally available sands, but also increased the structural number of the sand through its confinement abilities, which in turn, cut down on the amount of aggregate needed. The road was graded and compacted in order to prepare the sub-grade. The EnviroGrid® panels were installed over a non-woven geotextile that provided a separation layer between the sub-grade and geocell. The cells were then filled with locally available sandy soils.