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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.40 d
0.35 d
0.45 d
dependent on grade of concrete also

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Concrete Technology and Design of Concrete Structures
Maximum distance between expansion joints in structures as per IS : 456 – 1978 is

60 m
30 m
45 m
20 m

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Concrete Technology and Design of Concrete Structures
If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are

3.0 m and 3.0 m
1.5 m and 1.5 m
3.0 m and 1.5 m
1.5 m and 3.0 m

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

5%
20%
10%
15%

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Concrete Technology and Design of Concrete Structures
In a counterfort retaining wall, the main reinforcement is provided on thei) bottom face in front counterfortii) inclined face in front counterfortiii) bottom face in back counterfortiv) inclined face in back counterEortThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
To minimize the effect of differential settlement, the area of a footing should be designed for

Dead load + live load
Dead load + fraction of live load
Dead load only
Live load + fraction of dead load

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