Concrete Technology

1

Placing of concrete should preferably be done at a temperature of

A. ` 0^circ C`

B. ` 10^circ C`

C. ` 20^circ C`

D. `23^circ C`

E. `27 pm 2^circ C`

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2

For the construction of the retaining structures, the type of concrete mix to be used, is

A. 1 : 3 : 6

B. 1 : 2 : 4

C. ` 1 : 1 1/2` : 3

D. 1 : 1 : 2

E. 1 : 4 : 8

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3: Pick up the incorrect statement from the following:
.

A. Tricalcium silicate (`C_ 3 S`) hydrates rapidly

B. Tricalcium silicate (`C_3 S`) generates more heat of hydration

C. Tricalcium silicate (`C_3 S`) develops early strength

D. Tricalcium silicate (`C_3 S`) has more resistance to sulphate attack

E. None of these.

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4: If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

A. ` P = (Z - X)/(Z - Y) xx 100`

B. ` P = (X - Z)/(Z - Y) xx 100`

C. ` P = (X - Z)/(Z + Y) xx 100`

D. ` P = (X + Z)/(Z - Y) xx 100`

E. ` P = (Z - X)/(Y - Z) xx 100`

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5

W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor `(W_p/W_f)` is 0.95, the workability of concrete is

A. extremely low

B. very low

C. low

D. high

E. none of these.

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