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Which of the following action can be used to prevent deep frost penetration in the ground surface in building?

(a) Removing the frost susceptible soil

(b) Placing insulating blankets of sand and gravel

(c) Providing proper drainage

(d) Interposing a pervious gravel blanket

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The above asked question is from Frost Action topic in portion Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

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Right option is (b) Placing insulating blankets of sand and gravel

Explanation: Placing insulating blankets of 15 to 30 cm thick layer of sand and gravel on the ground surface above the frost susceptible to prevent deep penetration method.

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