Drainage and Filter Materials: Selection Criteria and Terzaghi's Rule
A drainage layer must pass water and hold back soil. Learn Terzaghi's filter criteria, material cleanliness and how to place French drains and geotextiles.
4.75–25 mm
Gravel
Rounded Natural Gravel
Rounded natural gravel
Washed alluvial gravel with rounded particles for concrete, drainage and landscaping.
Made to order
Properties and technical role
Rounded natural gravel comes from alluvial beds. Its smooth surface and round shape improve fresh concrete workability, though its mechanical bond with cement paste is lower than that of crushed particles.
The good porosity of this gravel in bulk also suits it to drainage and filter layers.
Applications
- High-workability concrete
- Drainage and filter
- Landscaping
Slope protection and water structuresDrainage and filtration
Quality information
| Method | Test |
|---|---|
| ASTM C136 | Sieve analysis |
| ASTM C117 | Material finer than the 75 µm sieve |
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Inquire about Rounded natural gravel
The grading on offer, stock and supply terms for this product are confirmed at the time of inquiry.