# Civil Engineering - Concrete Technology

### Exercise :: Concrete Technology - Section 5

6.

A concrete using an air entrained cement

 A. has strength less than 10% to 15% B. has more resistance to weathering C. is more plastic and workable D. is free from segregation and bleeding E. all the above.

Explanation:

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7.

Pick up the correct statement from the following:

 A. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm B. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm C. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt D. The material having particles of size less than 0.002 mm, is known as clay E. All the above.

Explanation:

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8.

Placing of concrete should preferably be done at a temperature of

 A. 0°C B. 10°C C. 20°C D. 23°C E. 27 ± 2°C

Explanation:

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9.

The aggregate impact value of the aggregate used in

 A. building concrete is less than 45 B. road pavement concrete is less than 30 C. runway concrete is less than 30 D. all the above.

Explanation:

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10.

The maximum percentage of chemical ingredient of cement is that of

 A. magnesium oxide B. iron oxide C. aluminium D. lime E. silica.