What is shrinkage limit of soil?

The shrinkage limit of cohesive soils is defined as the water content at which further loss of moisture will not cause a decrease in volume.

How is shrinkage limit calculated?

Procedure of Shrinkage Limit Test

  1. Take a sample of mass about 100g from a thoroughly mixed soil passing 425 micron sieve.
  2. Take about 30g of soil sample in a large evaporating dish.
  3. Take the shrinkage dish.
  4. Fill the mercury in the shrinkage dish.

What is the shrinkage limit of clay soil?

Shrinkage limits ranged from 14.3 to 41.1% for remoulded samples and from 7.7 to 30.9% for undisturbed samples. Volumetric strains (dependent on initial water content, w0) ranged from 2 to 23% for undisturbed samples and from 18 to 52% for remoulded samples.

What is the liquid limit range of expansive soil?

11.2. 1 Identification of swelling soils

Soil properties Degree of expansion
Low Very high
Liquid limit 20–35 70–90
Plasticity index < 12 > 32
Shrinkage index < 15 > 60

What is shrinkage limit used for?

The shrinkage limit is used in soil classification as considered in relation to the natural moisture content of soil in the field, indicates the moisture content at which no further shrinkage of the specimen occurs.

What is shrinkage factor?

The shrinkage factor indicates the reduction in volume of soil from the borrow pit stage to the final compacted stage, while the bulkage factor accounts for the increase in volume of the soil between the pit and the loose state in the truck.

What is the use of shrinkage limit?

Which soils have higher shrinkage and swelling characteristics?

Clay soils are susceptible to shrinking and swelling, and the associated change in volume is one of the causes of subsidence, which is visible when cracks appear in our buildings.

What is high expansive soils?

Expansive soils, also known as soils with high shrink-swell potential, are common in various geographic regions, especially the central portion of North America. These soils are fine-grained clay minerals comprised of illites, kaolinites, or montmorillonites.

What types of soil are expansive?

There are three basic types of soil naturally occurring in this area: sand, silt and clay. Clay soils are generally classified as “expansive.” This means that a given amount of clay will tend to expand (increase in volume) as it absorbs water and it will shrink (lessen in volume) as water is drawn away.

Which apparatus used for shrinkage limit?

Digital Shrinkage Limit Test Apparatus

Display Type Digital
Evaporating Dish Diameter 12 cm
Brand Cosmos
Glass Cup Size 50 to 55 mm
Mercury in Bottle 500 gm

Shrinkage Limit of Soil (SL) Shrinkage limit is the limiting moisture content, expressed as a percentage of the dry weight of the soil, at which a further reduction in the moisture (by evaporation) will not cause any further decrease in the volume of the soil mass but at which an increase in the moisture content will cause an increase in…

How do you test for shrinkage limit in soil?

Shrinkage Limit Test Procedure Take about 100 gm of the soil sample from a thoroughly mixed portion of the material passing through 425 microns IS sieve. Take about 30 gm of soil sample in evaporating dish and mix thoroughly with distilled water till the voids are filled in completely.

How does evaporation of water cause shrinkage in soil?

Evaporation of water causes shrinkage in a soil up to a certain degree beyond which decrease in volume does not occur ; at this stage the soil has reached its shrinkage limit.

What is 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].