\(\rm \frac{0.657 C}{0.319 C + W_o}\)

The above expression where Wo = volume of mixing water in ml, C = weight of cement in gm, is used for

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PGCIL DT Civil 13 Aug 2021 Official Paper (NR I)
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  1. Calculation of gel / space ratio for half hydration
  2. Calculation of gel / space ratio for partial hydration
  3. Calculation of gel / space ratio for composite hydration
  4. Calculation of gel / space ratio for full hydration

Answer (Detailed Solution Below)

Option 4 : Calculation of gel / space ratio for full hydration
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Explanation:

Gel space ratio

Gel space ratio is defined as the ratio of the volume of hydrated cement paste to the sum of the volume of hydrated cement and of capillary pores.

Case-I

\(\rm \frac{0.657 C}{0.319 C + W_o}\)Calculation of gel / space ratio for full hydration

where Wo = volume of mixing water in ml, C = weight of cement in gm

Case-II

\(\rm \frac{0.657 C}{0.319 C\alpha + W_o}\)Gel space ratio for partial hydration

 where Wo = volume of mixing water in ml, C = weight of cement in gm; α = fraction of cement that has been hydrated

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