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Q: The phenomenon of increase in the volume of a given mass of sand caused by the films of water pushing the sand particles apart is referred to as:
  • A. water absorption
  • B. leaching
  • C. bulking
  • D. chalking
Correct Answer: Option C - Bulking of sand or finer aggregate is the phenomenon of increase in sand volume due to the increase of moisture content. The moisture content in the sand makes thin films around sand particles, hence, each particle exerts pressure, thus they move away from each other causing an increase in volume.
C. Bulking of sand or finer aggregate is the phenomenon of increase in sand volume due to the increase of moisture content. The moisture content in the sand makes thin films around sand particles, hence, each particle exerts pressure, thus they move away from each other causing an increase in volume.

Explanations:

Bulking of sand or finer aggregate is the phenomenon of increase in sand volume due to the increase of moisture content. The moisture content in the sand makes thin films around sand particles, hence, each particle exerts pressure, thus they move away from each other causing an increase in volume.