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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For the design of retaining walls, the minimum factor of safety against overturning is taken as

1.5
3
2
2.5

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Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.85 d
0.43 d
0.55 d
0.68 d

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Concrete Technology and Design of Concrete Structures
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

tensile and compressive
compressive and tensile
both tensile
both compressive

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Concrete Technology and Design of Concrete Structures
In counterfort type retaining walls i) the vertical slab is designed as a continuous slab ii) the heel slab is designed as a continuous slab iii) the vertical slab is designed as a cantilever iv) the heel slab is designed as a cantilever The 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
The property of the ingredients to separate from each other while placing the concrete is called

shrinkage
compaction
bulking
segregation

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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

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

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