Under which conditions pure clay soil gives ϕ value only?

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A. B. Salahudeen

When clays are completely dry the cohesion which is the mutual attraction of the soil particles and a property only activated by moisture is normally zero. Then, clay soils derive their strength from friction angles between the particles only.

Velusamy Gobinath

Dear A. B. Salahudeen,

Thank you for your answer.

Are you saying that cohesion is a function of water content in clay soil? clarification needed.