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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

elastic shortening of concrete
shrinkage of concrete
creep of concrete
loss due to friction

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Concrete Technology and Design of Concrete Structures
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

bond stress
tensile stress
compressive stress
shear stress

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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

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

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed byi) maximum bending momentii) shear forceiii) punching shear The correct answer is

(i), (ii) and (iii)
(i) and (iii)
only (i)
(i) and (ii)

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Concrete Technology and Design of Concrete Structures
In order to obtain the best workability of concrete, the preferred shape of aggregate is

angular
elongated
rounded
All of these

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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

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

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