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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The percentage of voids in cement is approximately

40%
50%
60%
70%

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

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Concrete Technology and Design of Concrete Structures
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

xv
Tv + Tc
xc

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Concrete Technology and Design of Concrete Structures
In counterfort type retaining wallsi) the vertical slab is designed as a continuous slabii) the heel slab is designed as a continuous slabiii) the vertical slab is designed as a cantileveriv) the heel slab is designed as a cantileverThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
According to Whitney’s theory, ultimate strain of concrete is assumed to be

0.6%
0.3%
0.5%
0.4%

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam i) reduces the negative moment at support ii) increases the negative moment at support iii) reduces the positive moment at center of span iv) increases the positive moment at center of span The correct answer is

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

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