Hydration of cement is due to chemical action of water with Tricalcium silicate

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Question
Hydration of cement is due to chemical action of water with
Options
A. Tricalcium silicate and dicalcium silicate
B. Dicalcium silicate and tricalcium aluminate
C. Tricalcium aluminate and tricalcium alumino ferrite
D. All the above.

Correct Answer

All the above.

Concrete Technology problems

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1. For providing a raft foundation, the following activities are involved
1. ramming the foundation bed
2. excavation of the soil upto required depth
3. laying the reinforcement over the foundation bed
4. curing the cement concrete placed over reinforcement
5. pouring the cement concrete over the reinforcement.
The correct sequence is
Options
A. 1, 2, 3, 4, 5
B. 5, 4, 3, 2, 1
C. 2, 1, 3, 5, 4
D. 3, 2, 5, 1, 4.

4. During percussion drilling
Options
A. ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
B. caving or mixing of strata are caused in soft soils or cohesionless soils
C. the soil to a considerable depth below the bottom of the hole gets disturbed
D. all the above.

5. Pick up the incorrect statement from the following :
Options
A. Cement is added to lime mortar to increase its hydraulic properties only
B. Lime surkhi mortar is used for pointing the walls
C. Lime should be slaked before preparing lime mortar
D. High early strength concrete is generally used in cold weather.

6. W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor is 0.95, the workability of concrete is
Options
A. extremely low
B. very low
C. low
D. high
E. none of these.

9. Internal friction between the ingredients of concrete, is decreased by using
Options
A. less water
B. fine aggregates
C. rich mix
D. more water and coarse aggregates
E. none of these.

10. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
Options
A. 7.30
B. 7.35
C. 7.40
D. 7.45
E. none of these.

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