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

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

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Concrete Technology and Design of Concrete Structures
If a beam fails in bond, then its bond strength can be increased most economi-cally by

providing vertical stirrups
increasing the depth of beam
using thinner bars but more in number
using thicker bars but less in number

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beami) reduces the negative moment at supportii) increases the negative moment at supportiii) reduces the positive moment at center of spaniv) increases the positive moment at center of span The correct answer is

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

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Concrete Technology and Design of Concrete Structures
The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

Provided more on front face than on inner face
Not needed
Provided equally on inner and front faces
Provided more on inner face than on front face

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Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

decrease in curing time
decrease in size of aggregate
increase in fineness of cement
increase in water-cement ratio

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