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GEOLABS Limited . . . Tel: +44 (0)1923
892 190 . . Fax: +44 (0)1923 892 191
Permeability -
Constant Head Permeability in a Permeameter
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Quick Prices
Testing
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Results given: |
You provide: |
- Coefficient of Permeability
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Note
High degrees of compaction may not be possible since the material is remoulded into acrylic, not steel, cylindrical apparatus.
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| Typical use(s): |
Material required: |
- Determining permeability for soakaways etc.
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2 kg for material up to 6.3mm particle size
6 kg for material up to 10mm particle size
Note
For material over 10mm particle size we would only be able to test by this method the material passing 10mm for a British Standard test, or include test material larger than this for a non-standard test. Depending on the mix of particle sizes, the non-standard test may give a more accurate reflection of the permeability of the whole material, but the larger than permitted particles may also give a large variability in measured permeability. It cannot be known if removing oversize material will increase or decrease the measured permeability. Removing occasional gravel from a sand would be likely to increase the permeability as large impermeable regions were removed. Removing medium and coarse gravel which had been the main constituents to leave only sand and fine gravel could well decrease the permeability by reducing the size of the interstices between the particles and so restrict the flow between them. A more suitable test for non-cohesive materials up to 37.5 mm particle size is the Horizontal Permeability test, but this typically requires 200 kg of material (enough to fill a box 1000mm long by 300mm square cross section).
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| Description |
Price excl. VAT |
Constant Head Permeability using a permeameter (up to 4 days duration)
(BS1377 : Part 5 : Clause 5 : 1990) |
£ 120.00 |
Extra over days in excess
of initial 4 days
(will not required if material suitable for test) |
£ 25.00 per day |
| Remoulding specimen |
£ 15.00 (always required) |
| Notes |
| This test is suitable only for samples with relatively high permeabilities (coefficients in the range 10-2m/s to 10-5m/s: typically no finer than fine sand / coarse silt). Please see the note in the 'material required' section regarding oversize material. For lower permeabilities, usually when checking that the material is impermeable enough to meet a specification, the Triaxial Permeability is a more appropriate test. |