DETERMINATION OF WATER CONTENT

                                    DETERMINATION OF WATER CONTENT
TERMINOLOGY
2.0 For the purpose of this standard, the definitions given in IS : 2809-1972*
shall apply.
3. APPARATUS
3.1 container - Any suitable non-crocodile air-tight container.
3.2 Balance -of sufficient sensitivity to weigh the soil sam les
accuracy of 0.04 percent of the weight of the soil taken PQ r the test
to an
(see 4.1).
3.3 Oven - thermostatically controlled, with interior of non-corroding
material to maintain the temperature at 110 f 5°C.
3.4 Desiccator -A desiccator with any suitable desiccating agent.

SOIL SPECIMEN
4.1 The soil specimen taken shall be representative of the soil mass. The
size of the specimen selected depends on the quantity required for good
representation, which is influenced by the gradation and the maximum
size of particles, and on the accuracy of v?-weighing.
ties are recommended for general laboratory use:
The following quantity-


Size of Particles                                                                            Minimum Quantity of Soil
More Than 90 P&cent Passing                                                     Specimen to% Taken for Test
                                                                                                              Mass in g
425-micron IS Sieve                                                                                   25
2-mm IS Sieve                                                                                            50
4:75-mm IS Sieve                                                                                       200 
IO-mm IS Sieve                                                                                          300
20-mm IS Sieve                                                                                           500
40.mm IS Sieve                                                                                          1000


Clean the container with lid, dry and weigh ( WI ). Take the required
quantity of the soil specimen in the container crumbled and placed loosely
and weigh with lid ( W, ). Th en keep it in an oven with the lid removed,
and maintain the temperature of the oven at 110 f 5°C ( see Note ). Dry
the specimen in the oven for 24 h. Every.time the container is taken out
for weighing. Replace the lid on the container and cool the container in
a desiccator. Record the final mass ( W,) of the container with lid with
dried soil sample


NOTE- Oven-drying at 110 f 5°C does not result in reliable water container values
for soil containing gypsum or other materials  having loosely bound water of hydration
or for soil containing significant amounts of organic material. Reliable water content
values for these soils can be obtained by drying in an oven at approximately 60 to 80°C.

CALCULATION
The percent of water content shall be calculated as follows:
                                       W2 - W3
                                                                x100
                                       W3-  W1

where
w = water content percent,
Ws = mass of container with lid with wet soil ing,
r/jr, = mass of container with lid with dry soil in g, and
WI = mass of container with lid in g.

REPORT
7.1 The water content ( w ) of the soil shall be reported to two significant
figures.
7.2 The results of the test shall be suitably recorded. A recommended
~0 forma for this record is given in Appendix A
       

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