Monthly Archives: August 2019

Are you using the right construction access mat for the job?

By: William G. Handlos, P.E. Research shows that GEOTERRA® and GEOTERRA® GTO structural mats provide a ground-surface reinforcement layer to support heavy loads over soft subgrades. More cost-effective than other reinforcement mat systems, the GEOTERRA mats can be utilized for either temporary or permanent applications and are reusable. Offering high crush and flexural strength, the GEOTERRA mats have demonstrated the ability to handle the forces from some of the heaviest wheeled and tracked vehicles under severe conditions. Scope of Test: Performance testing of the GEOTERRA and GEOTERRA GTO mat systems was conducted at the University of Kansas Geotechnical Laboratory over weak to intermediate subgrades with CBR values ranging from 1% to 4%. A total of twelve tests were conducted to identify threshold and limit conditions, to create a data-set for modeling, and to determine the equivalent crushed aggregate base. Testing Procedure: All of the test sections were subjected to 40 kN (9 kip) cyclic loading on a 300 mm (12 in) diameter plate. Earth pressure cells were placed over of the subgrade to measure vertical interface stress distribution. Loading plate displacements were measured by the displacement transducer inside the actuator. Test Observations: The following conclusions were determined for the GEOTERRA… Read more »