In the process of hydration of OPC, to complete all chemical reaction, the water requirement (expressed as the percentage of cement) is __________.

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SSC JE CE Previous Year Paper 6 (Held On: 22 Jan 2018 Morning)
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  1. 5 to 8%
  2. 8 to 16%
  3. 20 to 25%
  4. 35 to 45%

Answer (Detailed Solution Below)

Option 3 : 20 to 25%
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Approximately 23% water by weight is required for complete hydration i.e to complete all chemical reactions and 15% water is entrapped in between the voids of cement. The total water required for complete hydration and workability is 38% by weight.

∴ water required to complete all chemical reaction in cement is 23 %

Note:

The water required for completing chemical reaction is 23 %

A total of 38% water by weight of cement is required to complete the chemical reaction and fill the space within the gel pores.

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