TERRAM Roads & Highways
15Pages

Road & Highways

Geosynthetics in Highways and Related Applications Geosynthetics have been used in civil engineering since the 1970’s. One of the earliest applications was in the construction of highways where simple geotextile filters were placed between the sub-base and the subgrade to maintain the integrity of the stone layer. TERRAM - Products The ability of a geotextile filter to allow the passage of water yet still prevent intermixing of stone and soil has meant these filter/ separators are being used every day around the globe. At one end of the scale it could be a remote unpaved haul road or, at...

Improving Granular Layer Performance TERRAM Standard Geotextiles prevent intermixing of sub-base and subgrade layers. This intermixing causes a loss in bearing strength, as the stone layer becomes progressively contaminated, resulting in failure in the form of deformation. This can be remedied if it’s an unpaved area/road by filling the ruts but even this can be uneconomic or unacceptable if stone has to be imported over long distances at a later date. Without TERRAM Geotextiles With TERRAM Geotextiles If it’s a paved road then the intermixing could manifest itself as deformation at the...

Geotextile Selection TERRAM geotextiles can be unrolled directly onto a subgrade with adjacent and subsequent rolls overlapped between 300mm and 1000mm - the softer the subgrade, the greater the overlap. A combination of overlapping and sewing may be more economical where the subgrade strength is particularly low, or in other critical situations (see the ‘Jointing methods for TERRAM Geotextiles’ pdf document downloadable at www.terram.com). For example, the nomogram shown is for the design of unpaved roads and may be used to check initial layer thicknesses for a paved road, see Fig. 1....

TERRAM Geocomposite Drains are manufactured by bonding a compressionresistant net core between two geotextile filters or between a geotextile and a geomembrane. The grade of net dictates the composite’s flow capacity. The filter/net/filter composites are used for general area drainage and are easy-to-install, factory-assured replacements for tradition stone installations. The filter/net/membrane composites are used to drain from one side only and provide a barrier to the other – a cut-off drain. Both types can be deployed vertically or horizontally. TERRAM Geocomposite Drains are preferred...

Controlling Erosion on Highway Slopes Load Platforms and Tree Root Protection Combat slope erosion and stabilise surfaces using TERRAM GEOCELL. TERRAM Geocell load platforms, once filled with a free-draining granular material, act as a mattress that spreads traffic loads laterally to reduce vertical deflections. The fill is confined within the individual cells by hoop stress. Using TERRAM GEOCELL to control erosion ensures better resistance to the erosive effects of wind and water run-off. As TERRAM GEOCELL is made from permeable geotextile, it allows water to flow freely between cells...

Grass and Gravel Surface Stabilisation Retaining Walls Need an earth retention structure? TERRAM GEOCELL can stabilise and retain wall structures. TERRAM GEOCELL provides a cost-effective alternative to conventional earth retention structures as it eliminates the potential for cracking, spalling, splintering and corrosion commonly seen in concrete, steel and timber systems. Typical Applications • Steepened Embankments • Dams and Flood Defence Bunds Lightweight and easy to handle, reducing installation costs. The flexible TERRAM geotextile material allows TERRAM GEOCELL to effectively adapt...

Demarcation and Warning Layers Product Pages Demarcation and warning layers for underlying contaminants and services. If the filter/separation functions are required for construction over contaminated land then there is an additional benefit that TERRAM products can provide – high visibility so that they also warn operators during excavation at a later date. TERRAM Hi-Vis is a bright orange geotextile used to mark areas of soil prior to backfilling. Manufactured using orange fibres, it has the same filter/separator benefits of TERRAM Standard Geotextiles but provides a visible separation of...

TERRAM Standard Geotextiles TERRAM Geocomposite Drain TERRAM Standard Geotextiles enhance the performance and design life of granular layers by providing the filtration and separation functions. Typical uses for TERRAM Standard Geotextiles include ground stabilisation (between the sub-base and subgrade) and around drainage materials. TERRAM Geocomposite Drains are manufactured by bonding together textiles, membranes and nets in different combinations to create easier-to-install replacements for conventional granular layers. Preventing intermixing of granular materials and soils The textile...

TERRAM Geocell Retaining Walls Need an earth retention structure? TERRAM GEOCELL can stabilise and retain wall structures. Design Considerations TERRAM Geocell Erosion Control • Facia Angle TERRAM GEOCELL facia layers TERRAM Geotextile or Geogrid sheet reinforcement Selected infill • Wall Height Combat slope erosion and stabilise surfaces using TERRAM GEOCELL. COMPOSITE WALL TERRAM Geotextile Filter Fabric Perforated drainage pipe Lightweight and easy to handle, reducing installation costs. • Overturning Stability The flexible TERRAM geotextile material allows TERRAM GEOCELL to effectively...

TERRAM Geocell Tree Root TERRAM Truckpave Protect tree roots from vehicle traffic, whilst maintaining water and nutrient absorption using TERRAM GEOCELL. Manufactured from recycled plastics, TERRAM Truckpave cellular paving is robust, durable and capable of withstanding all levels of traffic up to and including coaches, dustcarts and HGVs. TERRAM GEOCELL filled with angular, reduced-fines sub-base Typical Profile Fixing Pins TERRAM geotextile filter fabric (e.g. T1000) TERRAM Truckpave’s cells can be filled with either grass seed/ topsoil or gravel, making them suitable for stabilising...