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Concrete Technology and Design of Concrete Structures

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

0.43 d
0.68 d
0.85 d
0.55 d

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Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

increases with richer mixes
None of these
decreases with richer mixes
remains constant

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at center of span
iv) increases the positive moment at center of span
The correct answer is

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

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Concrete Technology and Design of Concrete Structures
Approximate value of shrinkage strain in concrete, is

0.003
0.03
0.0003
3.0E-5

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Concrete Technology and Design of Concrete Structures
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on i) bottom face near counterfort ii) top face near counterfort iii) bottom face near centre of span iv) top face near centre of span The correct answer is

both (ii) and (iii)
both (i) and (iv)
only (ii)
only (i)

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Concrete Technology and Design of Concrete Structures
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

53 MPa and 42 MPa
42 MPa and 53 MPa
42 MPa and 35 MPa
35 MPa and 42 MPa

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