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Concrete Technology and Design of Concrete Structures

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

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

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

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Concrete Technology and Design of Concrete Structures
The strength of concrete after one year as compared to 28 days strength is about

15 to 20% more
20 to 25% more
10 to 15% more
25 to 50% more

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Concrete Technology and Design of Concrete Structures
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

Tv + Tc
xv
xc

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Concrete Technology and Design of Concrete Structures
The load factors for live load and dead load are taken respectively as

1.5 and 2.2
2.2 and 2.2
2.2 and 1.5
1.5 and 1.5

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

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

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