(B-5.2) Shut the valve to the vacuum pump and open the valve to water. When the water level reaches about 3cm above the top of the sample, shut the valve to water.
(B-5.3) Open the valve to air to recover the inner pressure of the vessel.
(B-6) Weighing of the vessel with saturated sample
(B-6.1) Take of the lid and the upper cylinder.
(B-6.2) Remove the material piled up above the lower vessel and wipe water on the lower vessel; and
(B-6.3) Measure the weight of the lower vessel including the sample.
The weight measured at step (B-6) is used for calculating the degree of saturation of the sample before the drainage. It is recommended to check the degree of saturation of the sample before the drainage as a reference.
3.3.2 Drainage and measurement of weight
The detailed procedure for step (C) is as follows：
(C-1) Set the lower vessel on an appropriate stand as illustrated in figure 3.
(C-2) Take out the plug in the drain hole for drainage.
(C-3) After 30 minutes, plug the drain hole and wipe water on the bottom plate of the lower vessel; and
(C-4) Measure the weight of the lower vessel including the sample after drainage.
3.3.3 Judgement
In the calculation of degree of saturation, it is assumed that the density of water is 1,000kg/m3 and mass of air is neglected. The formulae for calculating the degree of' saturation are as follows：
