Q. If w is the percentage of water required for normal consistency of cement, water to be added for determination of initial setting time is
Solution:
- The standard consistency or normal consistency of a cement paste is defined as the amount of water (in percentage by weight of dry cement) that permits the vicat plunger to penetrate to a depth of 5 to 7 mm from the bottom of the vicat mould.
- For determination of initial setting time it is needed to make cement paste by gauging the cement with 0.85 times the water re-quired to give a paste of standard consistency.
- Water content for consistency is 0.78W.
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