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Testing

• Coefficient of Permeability

• Remoulding conditions
  

Note
High degrees of compaction may not be possible since the material is remoulded into acrylic, not steel, cylindrical apparatus.

• Determining permeability for soakaways etc.

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).