This is a fast way to determine the moisture content. Although less accurate, it is more suitable as a field test. The method shall not be used if the soil contains large amounts of clay, gypsum, calcareous material or organic matter.
- evaporating dish– 10 to 15 cm in diameter.
- palette knife or steel spatula– A blade 10 cm long and 2 cm wide.
- balance Sufficient sensitivity for weighing soil samples to an accuracy of 0.4 percent of the mass of soil taken for testing.
- methylated spirit
- Clean, dry and weigh the evaporating dish (W.)1,
- Take an appropriate amount of soil sample in the evaporating vessel and weigh (W.)2,
- Apply methylated spirit over the soil at the rate of about one milliliter for every gram of soil taken so that the soil is well covered.
- Mix the methylated spirits thoroughly into the soil with a palate knife and break up any large lumps of clay.
- Place the evaporating dish on a surface that is not affected by heat and ignite the methylated spirits. Keep stirring the soil continuously with a spatula or knife, taking care not to destroy any soil.
- After the methylated spirits have completely burned, let the dish cool and weigh with the contents (W.)3,
The percentage of water content will be calculated as follows:
W = [(W2 – W3) / (W3 – W1)] * 100
W = amount of water present
woo1 = mass of the dish g. In
woo2 = mass of dish with wet clay g
woo3 = mass of the dish with dry clay in g
IS – 2720 – Part – 2