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The sedimentation analysis for particle size distribution is adopted for the soil particle that are finer than:


1. 75 micron
2. 625 micron
3. 425 micron
4. 47.5 micron

1 Answer

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Best answer
Correct Answer - Option 1 : 75 micron

Explanation:

(i) Mechanical analysis is defined as the determination of the mass of particles in the fraction containing particles of only a certain size.

  • Sieve Analysis: Suitable for coarse soil (greater than 75-micron particles) e.g. sand, gravel
  • Sedimentation Analysis: Suitable for fine soil (fines - particle size less than 75 microns) e.g. clay, silt

(ii) ​Sedimentation analysis is used only for the soil fraction finer than 75 microns.

(iii) The sedimentation analysis procedure is as follows:

  • Soil particles are allowed to settle from a suspension.
  • The decreasing density of the suspension is measured at various time intervals.
  • The procedure is based on the principle that in a suspension, the terminal velocity of a spherical particle is governed by the diameter of the particle and the properties of the suspension

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