SM150T User Manual 1.0
Appendix 1
46
Laboratory calibration for clay soils
This technique is adapted to avoid the near-impossibility of inserting the
SM150T into completely dry clay soil. It requires taking measurements at 2
significantly different, but still damp, moisture levels.
Equipment you will need:
SM150T and meter
Soil corer
Heat-resistant beaker (
500ml)
Weighing balance (accurate to < 1g)
Temperature controlled oven
Process
Notes and example
Collect a wet sample of the clay soil: 25 to 30% water content
would be ideal.
This sample needs to be unchanged from its in-situ density, to
be
500ml, to have the correct dimensions to fit the beaker,
and to be generally uniform in water content.
This is most easily done with soil-corer.
Measure the volume occupied by the sample
.
L
s
= 463.5ml
Weigh the wet sample, including the beaker
.
W
w
= 743.3g
