Q. The minimum water content at which soil can be rolled into a thread of 3mm diameter is: Soil Notepedia

Q. The minimum water content at which soil can be rolled into a thread of 3mm diameter is:


Solution:
The correct answer of above question is B. Plastic limit.
Explanations:
A. Liquid Limit: It is the minimum water content above which soil behaves like a liquid. Flood water is one of the examples of soil-water which crosses the liquid limit. Below liquid limit, the soil condition is called plastic limit.

B. Plastic Limit: It is a range of water content at which liquid show plastic behavior. When a soil is in plastic Limit, it can be rolled in a thread of 3mm diameter

C. Shrinkage Limit: It is the water content below which soil doesn't show the reduction in its volume. i.e Soil behaves as a solid.

D. Permeability Limit: It is the condition of soil above which soil can transmit the water. Water cannot be transmitted in the Zero void soil.

Shrinkage Limit, Plastic Limit, and Liquid Limit can be obtained in the laboratory test when water is increased in solid soil. These three terms are called the Consistency Limit or Atterberg Limit.  The following graph shows the different conistency limit (Volume V vs Water Content Wc)

Figure: Consistency Limit of Soil

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