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Natural moisture content

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Faizan Tanoli
Faizan Tanoli

The natural moisture content, also called the natural water content, is the ratio of the weight of water to the weight of solids in a mass of soil, usually expressed as a percentage. To determine this, a soil sample is weighed, dried in an oven between 105-110 degrees C for 16-24 hours, then weighed again. The loss in weight is the moisture evaporated and the natural moisture content can be calculated from the weights. Certain soils like peat or those containing gypsum require lower drying temperatures or longer drying times.

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Natural Moisture Content Presented By: Faizan Tanoli
NaturalMoistureContent Introduction: The natural water content also called the natural moisture content is the ratio of the weight of water to the weight of the solids in a given mass of soil. This ratio is usually expressed as percentage.
NaturalMoistureContent Apparatus: 1. Non-corrodible air-tight container. 2. Electric oven, maintain the temperature 3. between 1050 C to 1100 C. 4. Desiccator. 5. Balance of sufficient sensitivity
NaturalMoistureContent Procedure: 1. Clean the container with lid dry it and weigh it (W1). 2. Take a specimen of the sample in the container and weigh with lid (W2). 3. Keep the container in the oven with lid removed. Dry the specimen to constant weight maintaining the temperature between 1050 C to 1100 C for a period varying with the type of soil but usually 16 to 24 hours. 4. Record the final constant weight (W3) of the container with dried soil sample. Peat and other organic soils are to be dried at lower temperature (say 600 ) possibly for a longer period. Certain soils contain gypsum which on heating loses its water if crystallization. If itb is suspected that gypsum is present in the soil sample used for moisture content determination it shall be dried at not more than 800 C and possibly for a longer time.
NaturalMoistureContent Observations And Recording: Data and observation sheet for water content determination Average water content = w = 1 + 2 + 3 /3
NaturalMoistureContent

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Natural moisture content

  • 2. NaturalMoistureContent Introduction: The natural water content also called the natural moisture content is the ratio of the weight of water to the weight of the solids in a given mass of soil. This ratio is usually expressed as percentage.
  • 3. NaturalMoistureContent Apparatus: 1. Non-corrodible air-tight container. 2. Electric oven, maintain the temperature 3. between 1050 C to 1100 C. 4. Desiccator. 5. Balance of sufficient sensitivity
  • 4. NaturalMoistureContent Procedure: 1. Clean the container with lid dry it and weigh it (W1). 2. Take a specimen of the sample in the container and weigh with lid (W2). 3. Keep the container in the oven with lid removed. Dry the specimen to constant weight maintaining the temperature between 1050 C to 1100 C for a period varying with the type of soil but usually 16 to 24 hours. 4. Record the final constant weight (W3) of the container with dried soil sample. Peat and other organic soils are to be dried at lower temperature (say 600 ) possibly for a longer period. Certain soils contain gypsum which on heating loses its water if crystallization. If itb is suspected that gypsum is present in the soil sample used for moisture content determination it shall be dried at not more than 800 C and possibly for a longer time.
  • 5. NaturalMoistureContent Observations And Recording: Data and observation sheet for water content determination Average water content = w = 1 + 2 + 3 /3