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Concrete Technology and Design of Concrete Structures

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

15%
10 %
20%
5%

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Concrete Technology and Design of Concrete Structures
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

70 %
60%
50%
40%

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Concrete Technology and Design of Concrete Structures
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

compressive stress
shear stress
tensile stress
bond stress

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

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

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Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR / 4d
wR/d
2wR/d
wR/2d

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Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

decrease in size of aggregate
increase in fineness of cement
increase in water-cement ratio
decrease in curing time

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