# Reference

IS-13030-1991- Method of test for laboratory determination of water content, porosity, density and related properties of rock material.

# Objective

Determination of mass of water contained in a rock sample.

# Apparatus used

 Name of equipment Capacity Least count/Accuracy Oven 105±30C 10C Balance As per requirement 0.01% of the sample

# Procedure

• Clean the container and lid, dry it and determine the mass M1.
• Place the rock sample in the container. Weigh the container with sample and record it as M2.
• Remove the lid and place the container with the sample in the oven. Allow it to dry till it attains a constant mass.
• After complete drying of sample, remove it from oven, replace the lids and allow it to cool in a desiccators for 30 minutes.
• Weigh the oven dried sample with container and lid and record the weight as M3.

# Calculation

Water content is calculated using the following formula.

Water content, w = (Pore water mass, Mw/Grain mass, Ms)*100

= ((M2-M3)/(M3-M1))*100

Where, M1 = Mass in ‘g’ of the container and lid

M2 = Mass in ‘g’ of the container + lid + sample

M3 = Mass in ‘g’ of the container + lid + oven dried sample

# Report

Water content is reported to the nearest 0.1%.