In any GWW project, the durability and effectiveness of your construction stands or falls with the right choice of materials. Woven geotextiles play a crucial role in this when it comes to subsurface stabilization, separation of soil layers and water management. But how do you know which type of woven geotextile is right for your specific subgrade? In this practical checklist, you will discover step by step how to find the perfect match between woven geotextiles and your soil challenges, so that your project performs optimally both technically and economically.

What is woven geotextile and why is it important?

Woven geotextile is a synthetic textile product made from high-quality polypropylene fibers produced by a systematic weaving process. This results in a strong, durable material with a characteristic woven structure that resembles traditional bags. Unlike non-woven geotextiles, which look more like felt, woven geotextiles offer superior tensile strength at a lower weight.

The material is distinguished by its unique combination of mechanical and hydraulic properties. With tensile strengths ranging from 14 to 2000 kN/m and CBR strengths from 1.8 to 12.5 kN, woven geotextiles are essential for applications where soil stabilization is crucial. You can read more about the different types of woven geotextiles and their specific properties.

The service life of infrastructure projects is significantly extended by the application of woven geotextiles, resulting in reduced maintenance and lower long-term costs. The importance of this becomes even more apparent in projects where soil conditions are challenging, such as with saturated or unstable soils.

The main functions of woven geotextiles

Woven geotextiles perform several crucial functions within GWW projects, depending on the specific application and substrate:

• Separation: Prevents the mixing of different soil layers, preventing high-quality sand or aggregate from being lost in the underlying soil.
• Filtration: Allows water to pass through while blocking soil particles, which is essential for drainage and erosion control.
• Reinforcement: Increases the bearing capacity of the substrate due to its high tensile strength, perfect for roads, parking lots and temporary work platforms.
• Drainage: Facilitates the efficient drainage of water through the soil, essential in wet substrates.
• Protection: Protects other geotechnical components such as geomembranes from damage.

For sandy soils, the separation function is often primary, while for clay soils, the drainage and reinforcement functions are often more important. For dikes and coastal protection, the erosion control function is central.

How do you determine the right strength and permeability?

Selecting woven geotextiles with the right technical specifications is critical to project success. Here you must consider:

• Tensile strength: Determine the minimum strength required based on the expected load. For heavily loaded structures such as temporary roads or work platforms, types with higher tensile strength (80 kN/m or more) are required.
• Tear resistance: Essential when installing over rough substrates or where point loads may occur.
• Water permeability: The mesh size (opening size) should be matched to the soil characteristics to ensure optimum filtration without clogging.
• Material properties: Check that the material is resistant to the chemical composition of the soil and environmental factors such as UV exposure.

For engineering projects, it is essential to compare specifications with project requirements. Over-specification can lead to failure, while overspecification is unnecessarily costly.

Common challenges in geotextile selection

When selecting woven geotextiles, you may run into these challenges:

• Incompatibility with substrate: Not every geotextile works effectively on every soil type. Ensure proper match between soil type and geotextile properties.
• Insufficient durability: Some projects require special resistance to UV radiation, chemicals or biological factors.
• Incorrect mesh size: Openings that are too large can lead to material penetration, while openings that are too small impede water flow.
• Installation errors: Even the best geotextile performs poorly with improper installation, such as insufficient overlap or damage during placement.

Overcoming these challenges requires a thorough analysis of project specifications and soil conditions, followed by careful installation according to prescribed methods.

Sustainable alternatives to traditional geotextiles

The development of biobased and compostable geotextile alternatives offers new opportunities for projects where sustainability is a priority. These innovative materials combine functionality with reduced environmental impact.

Biobased geotextiles are produced from renewable resources and offer similar functional properties to traditional synthetic variants. For temporary applications, compostable variants can be an excellent choice, degrading naturally after their functional life without leaving microplastics behind.

These sustainable alternatives are particularly suitable for:

• Ecologically sensitive areas
• Temporary structures
• Projects with strict sustainability requirements
• Applications where removal may be problematic

Step-by-step selection method for your project

Follow this systematic approach to select the right woven geotextile for your project:

1. Analyze the subsurface: Determine soil type, hydrology and potential problem factors.
2. Identify the primary function: Should the geotextile primarily separate, reinforce, filter or drain?
3. Calculate the load: Determine what static and dynamic loads the geotextile must withstand.
4. Determine environmental factors: Evaluate exposure to UV radiation, chemicals and biological influences.
5. Define life expectancy: Is it a permanent or temporary application?
6. Select appropriate technical specifications: Select tensile strength, permeability and other properties based on the above factors.
7. Consider sustainability issues: Evaluate whether biobased or compostable alternatives are appropriate for your application.

By following these steps carefully, you will ensure a geotextile that performs optimally under the specific conditions of your project.

Expert advice for complex substrates

In challenging subsurface conditions or specialized applications, standard solutions often do not suffice. In these cases, technical advice from a specialized knowledge partner is indispensable.

Complex situations where expert advice adds value:

• Highly saturated or peaty substrates
• Areas of high groundwater pressure
• Chemically contaminated soils
• Extremely loaded structures
• Projects with stringent technical requirements

In such cases, a knowledge partner can develop custom solutions by combining different geotechnical materials or adapting specifications to the unique challenges of your project.

By following this checklist and seeking technical advice where necessary, you can be assured of getting the right woven geotextile for your specific subgrade, resulting in sustainable and cost-effective infrastructure projects.