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Q: What is the amount of water used to conduct the initial setting time test of cement which has a standard consistency of P. If p is the Standard consistency of cement, the amount of water used to find the initial setting time of cement is:
  • A. 0.55 p
  • B. 0.35 p
  • C. 0.75 p
  • D. 0.85 p
Correct Answer: Option D - Consistency– It is the amount of water used to make paste of normal consistency. It is about 30% generally. • It is the percentage of water required for the cement paste, the viscosity of which will be such that Vicat's plunger penetrates up to 5 to 7 mm from bottom (33 to 35 mm from top) of the Vicat's mould. • Initial setting time is measured from the instant water is added in to the cement upto the time it start loosing its plasticity and final setting is referred as the time which is measured from the instant water is added in to the cement upto the extent it completely looses its plasticity and attain sufficient firmness to resist definite loading. • There is no clear deformation between initial and final setting time. • In order to perform this test, 300 gm of cement sample to be tested is mixed with "0.85 P" P = Water content required to prepare the paste of standard consistency.
D. Consistency– It is the amount of water used to make paste of normal consistency. It is about 30% generally. • It is the percentage of water required for the cement paste, the viscosity of which will be such that Vicat's plunger penetrates up to 5 to 7 mm from bottom (33 to 35 mm from top) of the Vicat's mould. • Initial setting time is measured from the instant water is added in to the cement upto the time it start loosing its plasticity and final setting is referred as the time which is measured from the instant water is added in to the cement upto the extent it completely looses its plasticity and attain sufficient firmness to resist definite loading. • There is no clear deformation between initial and final setting time. • In order to perform this test, 300 gm of cement sample to be tested is mixed with "0.85 P" P = Water content required to prepare the paste of standard consistency.

Explanations:

Consistency– It is the amount of water used to make paste of normal consistency. It is about 30% generally. • It is the percentage of water required for the cement paste, the viscosity of which will be such that Vicat's plunger penetrates up to 5 to 7 mm from bottom (33 to 35 mm from top) of the Vicat's mould. • Initial setting time is measured from the instant water is added in to the cement upto the time it start loosing its plasticity and final setting is referred as the time which is measured from the instant water is added in to the cement upto the extent it completely looses its plasticity and attain sufficient firmness to resist definite loading. • There is no clear deformation between initial and final setting time. • In order to perform this test, 300 gm of cement sample to be tested is mixed with "0.85 P" P = Water content required to prepare the paste of standard consistency.