Posts Categorized: Construction Mats (GEOTERRA & GEORUNNER)

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 »

A Simple Question

Written by: William G. Handlos, P.E. How long does it take to install? It is a question we hear every day. When it comes to cost and installation rates for geosynthetic construction products, there are no simple answers to what seems like simple questions. In fact, beware of those who try to simplify determination of installation costs for their products with quick answers or charts and tables to determine construction rates. Experienced project managers and site supervisors of the crews charged with installation are in the best position to estimate productivity rates. They know best their crew’s capability and the characteristics of the site involved. The variables that need to be considered include: Crew size, talent, work ethic and workday length Temperature, precipitation and length of day (sunlight) Experience with product class Size of the project Site Access Site Conditions (see weather) Crew The optimum crew size is important. Too small and you may lose the benefits of assembly line productivity. Too large and you will find that you fall over each other and pay for extra “inspectors”. All crews are not created equally. The familiarity with tools and techniques vary greatly as does the work ethic both between crews and… Read more »