How do you test for shrinkage limits?
A soil specimen with moisture content above the liquid limit is placed in the shrinkage dish and struck off with the straightedge. The sample is then oven-dried. After coating in wax, the volume of the soil pat is computed by weighing in water and noting the difference from its weight in the air.
Why we do shrinkage limit test?
The shrinkage limit of soil is the water content of the soil when the water is just sufficient to fill all the pores of the soil and the soil is just saturated. The volume of the soil does not decrease when the water content is reduced below the shrinkage limit.
What is the importance of shrinkage limit?
This limit is needed for studying the swelling and shrinkage properties of cohesive soil. The shrinkage factor helps in the design problems of structure made up of this soil or resting on such soil. It helps in assessing the suitability of soil as a construction material in foundations, roads, embankments, and dams.
What is used in shrinkage limit experiment?
The shrinkage dish is placed in the evaporating dish and the dish is filled with mercury, till it overflows slightly. Then it is be pressed with plain glass plate firmly on its top to remove excess mercury.
What is soil shrinkage test?
Shrinkage limit is a test that evaluates the water content of a soil where further loss of moisture will not result in an additional volume reduction. The test to determine the shrinkage limit is ASTM D4943. The shrinkage limit is much less commonly used than the liquid and plastic limits.
What is plasticity test?
Plasticity testing is a basic measure of the nature of fine particles of a soils, <0.425 mm. Depending on the moisture content of a soil, it will appear in one of four states; solid, semi solid, plastic and liquid. This is known as the plastic state.
What is shrinkage limit?
Shrinkage limit (SL) is the moisture content at which a fine-grained soil does not change the volume on drying; the moisture loss is compensated by air that enters its pores. It can be determined in a laboratory using a disturbed or undisturbed soil sample.
What is CU and CC in sieve analysis?
The uniformity coefficient (Cu) and the coefficient of gradation (Cc) are the measures of soil gradation. These coefficients help to classify the soil as well graded or poorly graded ones.
Is code for light compaction test?
LIGHT/STANDARD PROCTOR COMPACTION TEST OF SOIL(IS-2720-PART-7-1980)
Is soil a code test?
SOIL AND FOUNDATION ENGINEERING INDIAN STANDARD CODE BOOKS FREE DOWNLOAD PDF
| IS Code | Title | Download Link |
|---|---|---|
| IS 2720-5 1985 | Methods of test for soils, Part 5: Determination of liquid and plastic limit | Download |
| IS 2720-6 1972 | Methods of test for soils, Part 6: Determination of shrinkage factors | Download |
How often is the shrinkage limit test done?
Result of Shrinkage limit test (re-molded soil) is repeated at least three times, and the average value is reported; and if any test shows a variation of 2% against the mean, the test is repeated. The shrinkage limit test result for a typical re-molded soil is given in ##Table 10.13.
How is shrinkage index related to volumetric shrinkage?
Volumetric shrinkage is the decrease in volume (expressed as a percentage of the soil mass when dried) of a soil mass when the water content is reduced from a given percentage to the shrinkage limit. The shrinkage index is the numerical difference between the plastic limit and shrinkage limit of the remolded soil [8].
How is shrinkage limit related to water content?
The shrinkage limit (SL) is defined as the water content at which the soil changes from a semi-solid to a solid state. At this moisture content the volume of the soil mass ceases to change with further drying of the material. The shrinkage limit is less frequently used than the liquid and plastic limits.
What does W1 mean in shrinkage limit test?
Volumetric shrinkage (or volume change). where w1 is the given moisture content in percent. Result. Result of Shrinkage limit test (re-molded soil) is repeated at least three times, and the average value is reported; and if any test shows a variation of 2% against the mean, the test is repeated.