If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75

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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.

Correct Answer

7.40

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1. 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.

4. 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.

5. 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.

9. For given water content, workability decreases if the concrete aggregates contain an excess of
Options
A. thin particles
B. flat particles
C. elongated particles
D. flaky paticles
E. all the above.

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