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Concrete Technology and Design of Concrete Structures

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

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

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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
Finer grinding of cement

both (a) and (b)
affects only the early development of strength
affects only the ultimate strength
does not affect the strength

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Concrete Technology and Design of Concrete Structures
1% of voids in a concrete mix would reduce its strength by about

10 %
20%
5%
15%

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Concrete Technology and Design of Concrete Structures
In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

both front face and inner face
inner face only
None of these
front face only

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Concrete Technology and Design of Concrete Structures
Ultimate strength of cold drawn high steel wires

does not depend on diameter of bar
decreases with increase in diameter of bar
increases with increase in diameter of bar
None of these

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