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Bidim® is a non-woven geotextile designed to assist with a range of engineering problems including separation, filtration, drainage in roads, rail, and water applications.
Its robust three-dimensional structure provides long-term performance and reliability, helping to improve asset longevity while reducing maintenance requirements over the life of the project.
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WHY CHOOSE BIDIM?
In infrastructure development projects such as road and rail, Bidim offers excellent filtration, separation and drainage properties.
Bidim provides:
- Made from virgin polyester with a reinforced three-dimensional structure and equal strength across all directions
- Excellent filtration and separation properties
- Reduces the requirement for quarried fill materials, helping to minimise construction time and project costs
- A strong three-dimensional structure delivers superior stability, maintaining its integrity under load while providing consistent performance in filtration, drainage, and separation applications
- Designed to meet the requirements of New Zealand road and state highway requirements, NZTA TNZ F/7 Specification for Geotextiles
Applications
Ground & Pavement Stabilisation
Almost every road constructed today incorporates a non-woven geotextile beneath the pavement structure to provide both separation and filtration functions. Water ingress is one of the primary causes of pavement deterioration, making effective drainage and the rapid removal of water critical to extending pavement life and reducing long-term maintenance costs.
In addition, the geotextile acts as a separation layer between the underlying soft subgrade and the imported fill material, helping to prevent the migration of fines into the aggregate layer and maintaining the integrity and performance of the road structure over time.
Subsoil Drainage
Standard road construction practice typically incorporates edge drainage systems that utilise geotextiles to manage groundwater and maintain pavement performance. To maximise the effectiveness of these drainage systems, a geotextile with high hydraulic flow capacity is preferred.
Bidim non-woven geotextile features a highly permeable three-dimensional structure that creates numerous flow pathways for water movement. As a result, it facilitates rapid water transmission and delivers flow rates that often exceed those of the surrounding natural soils and aggregates with which it is in contact.
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FUNCTION
Drainage
Geosynthetics can act as a drain to carry fluid through less permeable soils. Ideal for use in subsoil drainage systems, can be used to dissipate pore water pressures at the base of road and railway embankments, sports fields and behind retaining walls. Facilitates surface water runoff.
Filtration
Geosynthetics can act as a filter by allowing water to move freely through while preventing the migration of fine particles. Often used to prevent soils from migrating into drainage aggregate or pipes while maintaining flow. Can also prevent soil erosion in coastal and riverbanks when used below loose stones or rocks and other material.
Protection
Geosynthetics can prevent acute damage caused by adjacent materials. Often used together with a barrier to ensure that surrounding areas will not be contaminated. Widely used on landfills, tunnel construction and dams.
Separation
Geosynthetics can be used to prevent the intermixing of soil types of different sizes in the construction of roads, railways, and embankments where the ground is soft and unstable to maintain the integrity of each material while allowing free passage of liquids or gases. Using a layer of geotextile to separate the soft ground from the fill material reduces the amount of fill required, increases the lifespan of the road or rail structure and cuts long-term maintenance costs.
