Identify the correct statements from the following.

A: Densification of soil is a type of mechanical stabilisation.

B: Addition of calcium chloride can facilitate soil compaction.

C: Heating of soil is not a method of soil stabilisation.

Explanation:

• Mechanical stabilisation involves the physical alteration of the soil properties without changing its chemical composition.

• It primarily includes compaction, densification, and blending of different types of soils or aggregates.

• Densification of soil (→ as stated in Statement A) is a key mechanical method where soil is compacted using rollers, tampers, or vibratory equipment.

• This process reduces voids, increases dry density, and improves load-bearing strength.

• Different types of soil (fine and coarse) may be mixed to achieve a well-graded composition, improving interlocking and reducing permeability.

• The properties are improved purely by altering moisture content and applying compactive effort.

• Ideal for subgrade improvement in highway construction, temporary roads, and embankments where immediate compaction is required.

Additional InformationSoil Stabilisation

• Soil stabilisation is the process of improving soil properties to make it more suitable for construction.

• It enhances strength, stability, load-bearing capacity, and durability of the soil.

• Mechanical Stabilisation – Altering physical properties by compaction, mixing, or grading.

• Chemical Stabilisation – Using additives like lime, cement, or calcium chloride to modify the soil structure.

• Thermal Stabilisation – Using heat (though rare) to remove moisture or alter soil behavior.

• Stabilised soils are used in the construction of roads, embankments, airport runways, and foundations.

• For cohesive soils, chemical or mechanical methods are common.

• For granular soils, compaction alone may be sufficient.

• Chemical agents like calcium chloride help in attracting moisture, aiding compaction and improving workability, especially in dry or sandy soils.