Composite Drainage Mesh

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Composite drainage mesh is made of double-sided bonded geotextile over a three-dimensional geogrid, combining the geotextile (filtering function) and geogrid (drainage and protection function) to provide "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, offering excellent water permeability.

Functionality Characteristics:
1. Laid between the subgrade and subbase, this system is designed to drain water between them, block capillary water, and effectively integrate with the edge drainage system. This structure automatically shortens the drainage path of the subgrade, significantly reducing the drainage time, and can also decrease the amount of subgrade material needed (i.e., materials with more fine particles and lower permeability). It can extend the service life of the road.

2. Laying a drainage mesh at the base layer prevents fine base materials from entering the subgrade (also serving as an isolation function). The granular base layer can only enter the upper part of the geotextile to a limited extent. In this way, the composite geotextile drainage mesh also has a potential to restrict the lateral movement of the granular base layer, similar to the reinforcing effect of geotextile grids. Generally, the tensile strength and rigidity of the composite geotextile drainage mesh are comparable to many geotextile grids used for foundation reinforcement, and this restrictive effect will enhance the supporting capacity of the foundation.

3. After road aging and crack formation, most rainwater enters the cross-section. In this case, the drainage grid is directly laid beneath the road surface, replacing the permeable subgrade. The drainage grid collects water before it enters the subgrade/underlayer. Moreover, a film can be wrapped at the bottom of the drainage grid to further prevent water from seeping into the subgrade. For rigid road systems, this structure allows for roads to be designed with a higher drainage coefficient Cd. Another advantage of this structure is that it may enable uniform hydration of concrete (the extent of this study is ongoing). This structure can extend the service life of both rigid and flexible road systems.

4. Under northern climate conditions, laying a drainage network can help mitigate the effects of frost heave. If the frost depth is significant, the geotextile mesh can be placed in a shallower position within the subgrade as a capillary action barrier. Additionally, it is often necessary to replace the granular subgrade base with one that is less prone to frost heave, extending downward to the frost depth. The frost-heaving susceptible backfill soil can be placed directly on 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.