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In rate analysis procedure, by what % the wet volume of concrete is to be increase for determining dry volume?
1. 20%
2. 30%
3. 52%
4. 25%

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Correct Answer - Option 3 : 52%


In rate analysis to find the dry volume, wet volume is increased by 52% because

  • In dry state, air voids are present in the constituents of concrete and while mixing with water, it is eliminated and a chemical reaction takes place.
  • Hence a reduction in volume happens.
  • And it is seen in natural practice that the number roughly varies from 52% to 58%.
  • So it became a thumb rule to increase it by 52% to find the dry volume of constituents of concrete.

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