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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

5%
15%
10%
20%

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Concrete Technology and Design of Concrete Structures
Admixtures which cause early setting, and hardening of concrete are called

retarders
air entraining agents
accelerators
workability admixtures

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

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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

compressive stress
bond stress
shear stress
tensile stress

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Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

2wR/d
wR / 4d
wR/2d
wR/d

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

anywhere
center
upper part of the beam
lower part of the beam

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