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CAT NO: DIDACTICNLE-Export-116019
Volume Change Gauge.
When conducting traixial tests on soil samples, it is observed that due
to internal pressure, the cell expands, soil specimen consolidates
resulting in the change of volume. Volume change Gauge is therefore
deviced to accurately measure volume changes. This is measured by
observing the quantity of water entering or leaving the cell as the cell
pressure and axial load are changed it is achieved by the displacement
of free surface between the water supplied to the cell and another fluid
(paraffin or kerosene). A dye is added to the paraffin for clear
demarcation of the interface. The unit consists of a glass graduated
tube of the appropriate capacity graduated to parts of a ml.enclosed in a
perspex tube sealed by two end caps. The unit is fitted with manifolds
and valves which enables it to be used with the triaxial cell and the
constant Pressure (Mercury controls) system. The cell pressure can
either be directly applied to the cell from the constant pressure system
or through the volume change gauge. The graduated glass tube is not
subjected to any difference in pressure and its inside is coated with a
layer f silicon water repellent to reduce the error in meniscus. There
is an arrangement for filling the unit with water and paraffin and a
drainage valve is provided in the lower end cap. The whole assembly is
mounted on a panel suitable for wall mounting. The unit is supplied
complete with a pressure hose with end couplings and a packet of dye.
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