Consider the following statements: I. All soils can be identified in the field by visual examination 2. Fine-grained soils can be identified in the field by visual examination and touch. 3. Fine-grained soils can be identified in the field by dilatancy test 4. By visual examination, only coarse-grained soils can be identified Which of the above statements are correct?

I and 2 only
2 and 3 only
3 and 4 only
I and 4 only

LohaHridoy

6 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 3 : 3 and 4 only

The soils having a size between 4.75 mm to 80 mm are considered as Coarse-grained soils and they are generally angular, flaky, or rounded shaped which can be easily predicted by visually.

While fine-grained soils have a very fine texture and small size particles which is difficult to identify them visually. Therefore, fine-grained soils are identified using the dilatancy test.

In dilatancy test, a wet soil sample is kept in the palm and observe the movement of water during shaking, squeezing (by closing hand) and following criteria is used generally for classifying the fine-grained soil:

Soil Type	Observation during Dilatancy test
Clay	Water slowly appears and remains on the surface during shaking or water slowly disappears upon squeezing.
Silt	Water quickly appears on the surface during shaking and quickly disappears upon squeezing.

6 views Answered 2022-09-04 04:29

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