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If ‘W’ is the percentage of water required for normal consistency of cement, water to be addedfor determination of initial setting time is
- a)0.50 W
- b)0.62 W
- c)0.75 W
- d)0.85 W
Correct answer is option 'D'. Can you explain this answer?
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If W is the percentage of water required for normal consistency of cem...
Water Requirement for Normal Consistency of Cement (W)
The water requirement for normal consistency of cement is defined as the percentage of water required to produce a cement paste of standard consistency. This standard consistency is determined by the Vicat apparatus test, where a plunger is used to penetrate the cement paste to a specified depth.
Water Added for Determination of Initial Setting Time
To determine the initial setting time of cement, which is the time taken for the cement paste to change from a plastic state to a hardened state, additional water needs to be added to the cement paste.
The amount of water added for the determination of initial setting time is expressed as a percentage of the water required for normal consistency of cement (W).
Calculation
To calculate the amount of water to be added for the determination of initial setting time, we need to multiply the water requirement for normal consistency (W) by a certain factor.
The correct factor to be used is 0.85. Therefore, the water to be added for determination of initial setting time is 0.85W.
Explanation
The factor of 0.85 is based on empirical observations and is derived from experimental data. It has been found that adding 0.85 times the water required for normal consistency provides the optimum conditions for the determination of the initial setting time of cement.
By using this factor, the cement paste will have a slightly higher water content, which allows for better hydration and setting characteristics during the initial setting time test.
Conclusion
In conclusion, the correct answer is option 'D' - 0.85W. This is the amount of water that needs to be added for the determination of the initial setting time of cement, where W represents the water requirement for normal consistency. Adding 0.85 times the water required for normal consistency ensures accurate and consistent results in determining the initial setting time of cement.
The water requirement for normal consistency of cement is defined as the percentage of water required to produce a cement paste of standard consistency. This standard consistency is determined by the Vicat apparatus test, where a plunger is used to penetrate the cement paste to a specified depth.
Water Added for Determination of Initial Setting Time
To determine the initial setting time of cement, which is the time taken for the cement paste to change from a plastic state to a hardened state, additional water needs to be added to the cement paste.
The amount of water added for the determination of initial setting time is expressed as a percentage of the water required for normal consistency of cement (W).
Calculation
To calculate the amount of water to be added for the determination of initial setting time, we need to multiply the water requirement for normal consistency (W) by a certain factor.
The correct factor to be used is 0.85. Therefore, the water to be added for determination of initial setting time is 0.85W.
Explanation
The factor of 0.85 is based on empirical observations and is derived from experimental data. It has been found that adding 0.85 times the water required for normal consistency provides the optimum conditions for the determination of the initial setting time of cement.
By using this factor, the cement paste will have a slightly higher water content, which allows for better hydration and setting characteristics during the initial setting time test.
Conclusion
In conclusion, the correct answer is option 'D' - 0.85W. This is the amount of water that needs to be added for the determination of the initial setting time of cement, where W represents the water requirement for normal consistency. Adding 0.85 times the water required for normal consistency ensures accurate and consistent results in determining the initial setting time of cement.
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If W is the percentage of water required for normal consistency of cement, water to be addedfor determination of initial setting time isa)0.50 Wb)0.62 Wc)0.75 Wd)0.85 WCorrect answer is option 'D'. Can you explain this answer?
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