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Composite drainage mesh is made from double-sided bonded geotextile over a three-dimensional geogrid, combining the functions of geotextile (filtering) and geogrid (drainage and protection) to offer "filtering-drainage-protection" benefits. The three-dimensional structure of the composite drainage mesh core can withstand high compressive loads throughout its use and maintain a considerable thickness, providing excellent water permeability.

Functionality characteristics:
1. Laid between the subgrade and sub-base, this is used to drain water between them, block capillary water, and effectively integrate into the edge drainage system. This structure automatically shortens the drainage path of the subgrade, significantly reducing drainage time, and can also reduce the amount of subgrade material used (i.e., using materials with fine particles and lower permeability). It can extend the service life of the road.

2. Laying a drainage mesh at the subgrade level prevents fine subgrade materials from entering the subsoil (also serving as a barrier). The granular subgrade will only slightly infiltrate the upper part of the geotextile. In this way, the composite geotextile drainage mesh also has a potential function to limit the lateral movement of the granular subgrade, similar to the reinforcing effect of geotextile grids. Generally, the tensile strength and rigidity of the composite geotextile drainage mesh are superior to many geotextile grids used for foundation reinforcement, and this limiting effect will enhance the foundation's support capacity.

3. After road aging and crack formation, most rainwater enters the cross-section. In this case, directly lay the drainage grid under the road surface instead of permeable subgrade. The drainage grid can collect the water before it enters the subgrade/subbase. Moreover, a film can be wrapped at the bottom of the drainage grid to further prevent water from entering the subgrade. For rigid road systems, this structure allows for designing roads with a higher drainage coefficient Cd. Another aspect of this structure is that it may enable uniform hydration of concrete (research on this point is ongoing). Regardless of rigid or flexible road systems, this structure can extend the service life of roads.

4. Under northern climate conditions, laying a drainage network can help mitigate frost heave effects. If the freezing depth is deep, the geotextile mesh can be placed in a shallower position within the subgrade, acting as a capillary action barrier. Additionally, it's often necessary to replace the granular subgrade base with a non-frost-heaving material, extending downwards to the freezing depth. Frost-heaving backfill soil can be placed directly on top of the drainage network, up to the ground surface level of the foundation. In this case, the system can be connected to the drainage outlet, keeping the groundwater level at or below this depth. This can potentially limit the growth of ice crystals, allowing for unrestricted traffic loads during spring thaw in cold regions.