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_________ method is useful when the soil consists of sand or granular material.

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_________ method is useful when the soil consists of sand or granular material.

(a) Vibroflotation

(b) Chemical grouting

(c) Chemical consolidation

(d) Freezing

I got this question in an interview for internship.

Question is from Underpinning and its Types topic in chapter Scaffolding, Shoring and Underpinning of Construction & Building Materials

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Right choice is (c) Chemical consolidation

To explain: Here, the cost of consolidation depends on the nature of soil, depth of consolidation, site of work, etc. In this method, the soil under the existing footing is consolidated by using Chemicals. The chemical reaction takes place between two chemicals and hence the soil is consolidated.

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