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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The slab is designed as one way if the ratio of long span to short span is

greater than 2
between 1 and 1.5
less than 1
between 1.5 and 2

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Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete is i) to increase shrinkage ii) to decrease shrinkage iii) to increase setting time iv) to decrease setting time The correct answer is

(ii) and (iii)
(ii) and (iv)
(i)and(iv)
(i) and (iii)

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Concrete Technology and Design of Concrete Structures
Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

34 liters
30 liters
32 liters
28 liters

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Concrete Technology and Design of Concrete Structures
Ratio of permissible stress in direct compression and bending compression is

between 1 and 1.5
less than 1
between 1.5 and 2.0
greater than 2

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Concrete Technology and Design of Concrete Structures
The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

0.416 xu
0.446 xu
0.367 xu
0.573 xu

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

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