Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

directly proportional to compressive strength
inversely proportional to compressive strength
inversely proportional to square root of compressive strength
directly proportional to square root of compressive strength

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Concrete Technology and Design of Concrete Structures
Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are

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

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, high alumina cement has

lower initial and final setting times
higher initial setting time but lower final setting time
lower initial setting time but higher final setting time
higher initial and final setting times

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