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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

0.75 - 0.80
Above 0.92
0.75 - 0.80
0.85 - 0.92

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Concrete Technology and Design of Concrete Structures
Workability of concrete is inversely proportional to

time of transit
size of aggregate
the air in the mix
vater-cement ratio

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Concrete Technology and Design of Concrete Structures
The ratio of the diameter of reinforcing bars and the slab thickness is

1/4
1/6
1/5
1/8

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Concrete Technology and Design of Concrete Structures
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

M25
M15
M20
M10

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Concrete Technology and Design of Concrete Structures
Workability of concrete is directly proportional to

Time of transit
Grading of the aggregate
Aggregate cement ratio
All of above

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Concrete Technology and Design of Concrete Structures
1% of voids in a concrete mix would reduce its strength by about

20%
10 %
5%
15%

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