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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

4.5
2.5
5.5
3.5

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Concrete Technology and Design of Concrete Structures
Select the incorrect statement for ...

Bleeding can be increased by addition of calcium chloride.
Lean mixes bleed more as compared to rich ones.
None of these
Bleeding can be minimized by adding pozzuolana finer aggregate.

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Concrete Technology and Design of Concrete Structures
Prestress loss due to friction occurs

in both post-tensioned and preten-sioned beams
only in pretensioned beams
only in post-tensioned beams
None of these

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Concrete Technology and Design of Concrete Structures
The permissible diagonal tensile stress in reinforced brick work is

about 0.1 N/mm²
about 1.0 N/mm²
zero
0.3 N/mm² to 0.7 N/mm²

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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

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

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

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