Civil Engineering - Concrete Technology

41. 

According to IS : 382-1963, a good aggregate should be

A. chemically inert
B. sufficiently strong
C. hard and durable
D. all the above.

Answer: Option D

Explanation:

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42. 

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

A. between 150 to 300 kg/cm2
B. between 350 to 600 kg/cm2
C. between 150 to 500 kg/cm2
D. below 200 kg/cm2
E. none of these.

Answer: Option D

Explanation:

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43. 

If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation

A. 0.1P + 0.3Y + 0.1Z = W/C x P
B. 0.3P + 0.1Y + 0.01Z = W/C x P
C. 0.4P + 0.2Y + 0.01Z = W/C x P
D. 0.5P + 0.3Y + 0.01Z = W/C x P
E. 0.2P + 0.5Y + 0.1Z = W/C x P

Answer: Option B

Explanation:

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44. 

For the construction of thin R.C.C. structures, the type of cement to be avoided, is

A. ordinary Portland cement
B. rapid hardening cement
C. low heat cement
D. blast furnace slag cement
E. sulphate resisting cement.

Answer: Option D

Explanation:

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45. 

Vicat apparatus is used for

A. fineness test
B. consistency test
C. test for setting time
D. test for tensile strength
E. none of these.

Answer: Option B

Explanation:

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