TechGrid D - Coated Knitted Polyester Geogrid
TechGrid D
TechGrid© D is a soil reinforcement geogrid produced by knitting high strength polyester yarns and coated with PVC or PVA, providing equal tensile strength in both directions.
TechGrid© D absorbs the tensile stresses that the soil cannot carry and allows the load to be distributed over a wide area. Because polyester yarns deliver high strength at low elongation levels, the reinforcement engages before the fill material undergoes any significant deformation. The dimensionally stable aperture of the knitted structure allows the fill particles to interlock within the openings and limits lateral movement. The coating on the surface protects the yarns against mechanical damage during placement and compaction, as well as against chemical effects in the soil.
TechGrid D Functions
TechGrid© D forms a reinforcement layer that transfers load between the subgrade and the fill material. Soils have adequate compressive strength but almost no tensile strength, which is why they spread laterally under load, resulting in settlement and failure. By interlocking the fill particles within the knitted apertures, the geogrid limits this spreading and distributes the load along its own plane over a wide area. Thanks to this behaviour, the product delivers four essential functions in a single layer.
Stabilization
Fill placed over weak subgrade spreads laterally under traffic load, causing rutting and settlement. TechGrid© D limits this spreading by interlocking the fill particles within the knitted apertures and forms a stable layer that transfers load between the fill and the subgrade.
Durability
The PVC or PVA coating on the surface protects the polyester yarns against mechanical damage during placement and compaction. The same coating also forms a barrier against chemical effects and moisture conditions in the soil, allowing the product to retain its strength throughout the service life of the structure.
Reinforcement
Soils have adequate compressive strength but almost no tensile strength. Thanks to its equal tensile strength in both directions, TechGrid© D absorbs the stresses the soil cannot carry and increases bearing capacity by distributing the load along its own plane over a wide area.
Improved Soil Layers
Reinforced fill delivers the same performance with a thinner section. This reduces excavation depth and the volume of granular fill required, lowering material and haulage costs where weak subgrade would otherwise call for soil replacement.
Dimensionally Stable Knitted Structure That Interlocks Fill Particles
TechGrid© D is produced by knitting polyester yarns, and because the junction points do not shift under load, the aperture remains dimensionally stable. When fill is placed, granular particles enter these openings and interlock by bearing against their edges. Particles attempting to move laterally transfer load to the yarns of the geogrid, movement is restrained, and the fill behaves as a layer that acts rigid within itself. Selecting an aperture size compatible with the fill particle size is the key factor determining how effective this interlock will be.
TechGrid D Features
- Produced by knitting high strength polyester yarns
- Provides equal tensile strength in both directions
- Junction points do not shift under load, keeping the aperture dimensionally stable
- The PVC or PVA coating protects the yarns against mechanical damage and chemical effects
- Limits lateral movement by interlocking fill particles within the knitted apertures
- Increases bearing capacity by distributing load along its own plane over a wide area
- Reduces excavation and material costs by decreasing granular fill thickness
- Delays the formation of rutting and settlement under traffic load
- Provides flexible behaviour under dynamic loads in reinforced soil retaining walls
Frequently Asked Questions
1. What Is TechGrid D?
TechGrid© D is a soil reinforcement geogrid produced by knitting high strength polyester yarns and coated with PVC or PVA. It provides equal tensile strength in both directions.
2. How Does TechGrid D Reinforce Soil?
Soils have adequate compressive strength but almost no tensile strength, and they spread laterally under load, resulting in settlement. TechGrid© D limits this spreading by interlocking fill particles within the knitted apertures and distributes the load along its own plane over a wide area.
3. What Is the Purpose of the PVC or PVA Coating?
The coating protects the polyester yarns against mechanical damage during placement and compaction. It also forms a barrier against chemical effects and moisture conditions in the soil, allowing the product to retain its strength throughout its service life.
4. Why Is Equal Strength in Both Directions Important?
In geogrids reinforced in one direction only, the reinforcement works along a specific axis and the placement direction has to be planned according to the project. With equal strength in both directions, the reinforcement delivers the same performance regardless of the direction the load comes from, which reduces the risk of placement error in applications carrying distributed loads.
5. Where Is TechGrid D Used?
It is used in subbase reinforcement of road and railway platforms, fill and slope stabilisation, reinforced soil retaining walls, bridge approach embankments and foundation areas resting on weak subgrade. It is also preferred for soil reinforcement along pipeline and sewer routes.
6. Does TechGrid D Reduce Fill Thickness?
Reinforced fill delivers the same bearing performance with a thinner section, which reduces excavation depth and the volume of granular fill required. The extent of the thickness reduction varies with subgrade conditions and design load, and needs to be calculated on a project basis.
