Question:
Which of the following is preferred for filtration function of geotextile?
Which of the following is preferred for filtration function of geotextile?
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- Geotextile filtration function Allow water passage, retain soil particles.
- Key requirements Appropriate permeability, pore size, and long-term durability (resistance to rot, chemicals, UV).
- Natural fibers (jute, cotton, wool) Generally biodegradable, not suitable for long-term buried applications where sustained performance is needed.
- Synthetic fibers (polypropylene, polyester) Resistant to biodegradation, good chemical resistance, durable. Widely used in geotextiles.
- Nonwoven fabric structure Often preferred for filtration geotextiles due to its good permeability and ability to be engineered for specific pore characteristics.
Updated On: Sep 25, 2025
- Jute nonwoven
- Cotton knitted
- Polypropylene nonwoven
- Wool knitted
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
1. What is a Geotextile?
Geotextiles are permeable fabrics used in civil engineering and construction projects. They are primarily employed for functions like:
- Filtration
- Drainage
- Separation
- Reinforcement
- Protection
2. Filtration Function in Geotextiles:
For filtration, a geotextile must:
- Allow water to pass through
- Retain soil particles (prevent clogging or soil erosion)
- Be durable, chemically inert, and resistant to biological degradation
3. Evaluating the Options:
| Option | Material Type | Suitability for Filtration |
| Jute nonwoven | Natural, biodegradable | Not durable; degrades over time |
| Cotton knitted | Natural, flexible | Poor filtration, lacks durability in soil |
| Polypropylene nonwoven | Synthetic, durable, high strength | Excellent for filtration |
| Wool knitted | Natural, soft, absorbent | Not suitable; bio-degradable and low mechanical strength |
Why Polypropylene Nonwoven?
- Hydrophobic (doesn’t absorb water, but lets it pass)
- Chemically inert (resistant to soil chemicals)
- High tensile strength and stability
- Long-lasting (doesn’t rot or degrade easily)
- Widely used in geotextile applications including roadbeds, landfills, drainage systems
Final Answer:
(3) Polypropylene nonwoven — It is the most suitable and preferred material for the filtration function of geotextiles.
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