Plastic Drainage Mesh

Product description 

Three-dimensional plastic drainage mesh (also known as three-dimensional geotechnical drainage board, tunnel discharge water board, discharge water board) is a three-dimensional structure of the plastic mesh, can replace the traditional sand and gravel layer, mainly used for landfills, road beds and tunnel lining drainage.
In the railway, highway and other transport infrastructure in the safety and service life of the project and its own drainage system has an inextricable relationship, in which geosynthetics is an important part of the drainage system.

Characteristics of three-dimensional plastic drainage mesh
1. When the load is 720kPa and the gradient is 2%, the permeability is 2500m/d and the flow rate is 13pm/m.
2. Creep test retains more than 60% thickness after 10,000 hours of 1200kPa load.
3. Three-dimensional drainage mesh core carbon black content of not less than 2%, density 0.94g/cm3, tensile strength of not less than 36.5kN/m, melt index 1.0 g/10min, thickness 7.6mm.

The role of three-dimensional drainage mesh characteristics
1. Laid between the foundation and the sub-base, it is used to discharge water accumulated between the foundation and the sub-base, blocking capillary water and effectively combining it into the edge drainage system. This structure automatically shortens the drainage path of the foundation, the drainage time is greatly reduced, and the number of selected foundation materials used can be reduced (i.e. materials with more fines and lower permeability can be used). The service life of the road can be extended.
2. In the sub-base laying three-dimensional composite drainage mesh can prevent the sub-base of fine materials into the ground base (that is, play a role in isolation). Aggregate grass-roots level will enter the upper part of the geotechnical mesh to a limited extent. In this way, the composite geodrainage mesh also has the potential to limit the lateral movement of the aggregate subgrade, and in this way it acts in a similar way to the reinforcing effect of a geogrid. Generally speaking, the composite geotechnical drainage mesh tensile strength and rigidity is better than many geogrids used for foundation reinforcement, this limiting effect will improve the support capacity of the foundation.
3. When the road is aged and cracks are formed, most of the rainwater will enter the section. In this case, the three-dimensional composite drainage mesh is laid directly under the road surface instead of the drainable foundation. The 3D composite drainage mesh can collect the moisture before it enters the foundation/sub-base. And a membrane can be wrapped around the bottom of the 3D composite drainage mesh to further prevent moisture from entering the foundation. For rigid road systems, this structure permits the design of roads with higher drainage coefficients Cd. Another advantage of this structure is that it may be possible to hydrate the concrete more uniformly (research on the extent of this advantage is ongoing). Whether for rigid or flexible road systems, this structure can extend the life of the road.
4. In northern climates, the laying of 3D composite drainage mesh can help to mitigate the effects of frost heave. If the depth of freezing is deep, the geonet can be laid in a shallower position in the sub-base as a capillary action blockage. It is also often necessary to replace the sub-base with a granular sub-base that is less susceptible to frost heave, extending down to the depth of the freeze. The frost-swellable backfill can be filled directly on top of the 3D composite drainage mesh up to the foundation ground line. In this case, the system can be connected to a drainage outlet so that the water table is at a depth equal to or below this depth. This can potentially limit the development of ice crystals and eliminate the need to place restrictions on traffic loads during spring ice melt in cold regions.