Silt Content Test of Sand

Silt Content In Sand | Silt Content Test of Sand | Silt Content In Sand4 min read

Silt Content In Sand

The permissible silt content in sand must not exceed the values as specified in the IS standards. This methodology is only applicable to natural sand; it should not be used for crushed rock sand.

Silt Content In Sand | Silt Content Test of Sand | Silt Content In Sand
Silt Content Test of Sand

A good quality generally has a particle size between 150 microns to 4.75 mm is sieve size and if the particle size in the sand is less than this size, it is known as silt in the sand.

If silt content in sand exceeds more than 8% that may result in a reduction in binding capacity of mixed materials, also affect the strength and durability of the final product.

IS Code for Silt Content Test of Sand: IS 2386-2 (1963)

Silt Content In Sand Limit

Silt content in sand must not exceed 8% as per is IS 2386-2. If the silt content on sand exceed 8 % that that may result in a reduction in binding capacity of mixed materials, which also affects the strength and durability of the final product.


Silt Content Test

Apparatus

  • 250 ml glass measuring cylinder
  • Water
  • Sand

Silt Content Test of Sand Procedure

Silt Content Test of Sand
Silt Content Test of Sand
  1. The measuring cylinder is filled with the salt-water solution (concentration of the solution will teaspoon full of common salt for every 570 ml) up to the 50 ml mark on the cylinder.
  2. Add sand until the level of the sand is reached up to the 100 ml mark.
  3. Add further salt-water solution till the 150 ml mark is reached.
  4. Place the palm on the mouth of the glass cylinder and shake it vigorously.
  5. Place the measuring cylinder on a hard leveled surface and tap it all round so that sand is leveled.
  6. Wait for three hours for the silt to settle on top of the sand.
  7. Measure the thickness of the silt layer and the height of the sand.

Observation Table

DETERMINATION OF SILT CONTENT

Sr. No:DescriptionSample – 1Sample – 2
1Thickness of Sand Layer
2Height of Sand + Silt
Silt Content Test of Sand

If silt content is exceeding 3% by weight, then the washing of sand is necessary. After performing a few tests, a co-relation can be developed for silt layer thicknesses at various intervals of time. The silt content after a time interval of 10 minutes can be fixed as inspection criteria.


Sample Calculation

If the following observations are taken from the silt content of sand test,

Silt Layer Thickness = 1 cm

Sand + Silt Layer Height or Thickness = 10 cm

Silt Content of Sand = (1 cm / 10 cm) x 100 %

Silt Content of Sand = 1%

So, from the above Test and calculations, we can say that this sand has a 1% silt content.

Silt content limit in sand as per IS code is 8%, so this sand we can use for construction purposes.


Watch Video: Silt Content of Sand Determination

FAQs:

How Do You Calculate Silt in Sand?

The measuring cylinder is filled with the salt-water solution up to the 50 ml mark on the cylinder.
Add sand until the level of the sand is reached up to the 100 ml mark.
Add further salt-water solution till the 150 ml mark is reached.
Place the palm on the mouth of the glass cylinder and shake it vigorously.
Place the measuring cylinder on a hard leveled surface and tap it all around so that sand is leveled.
Wait for three hours for the silt to settle on top of the sand.
Measure the thickness of the silt layer and the height of the sand.

What Is the Limit of Silt Content In Sand?

The silt content limit in the sand as per IS code is 8%, so this sand we can use for construction purposes.

IS Code for Silt Content In Sand?

IS Code for Silt Content Test of Sand: IS 2386-2 (1963)

Why We Measure the Silt Content In the Sand?

The permissible silt content in the sand must not exceed the values as specified in the IS standards. This methodology is only applicable to natural sand; it should not be used for crushed rock sand.

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