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Concrete Technology
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The main object of compaction of concrete, is
to provide initimate contact between the concrete and embedded materials
to eliminate air holes
All the above.
to achieve maximum density
Water cement ratio is generally expressed in volume of water required per
20 kg
30 kg
50 kg
10 kg
40 kg
The operation of removing humps and hollows of uniform concrete surface, is known as
finishing
floating
screeding
None of these.
trowelling
Pozzolanic properties exist in
pumicite
All the above.
shales
diatomaceous clay
Fly ash
Pick up the incorrect statement from thefollowing.
While performing preliminary test on concrete
concrete ingredients should be kept at a temperature of 37° ± 2°C
proportions of the material and water should be the same as to be used at the work site
cement should be mixed by hand in order to maintain uniformity
concrete mix should be stored in air-tight containers
None of these.
To hydrate 500kg of cement full water needed, is
100 kg
130 kg
110 kg
120 kg
140 kg
The bulk density of aggregates does not depend upon
size and shape of aggregates
specific gravity of aggregates
size and shape of the container
grading of aggregates
None of these.
If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
8 kg
15 kg.
10 kg
14 kg
12 kg
An aggregate is said to be flaky, if its least dimension is less than
3/4 mean dimension
3/5 mean dimension
None of these.
5/8 mean dimension
2/3 mean dimension
If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
0.3P + 0.1Y + 0.01Z = W/C x P
0.4P + 0.2Y + 0.01Z = W/C x P
0.2P + 0.5Y + 0.1Z = W/C x P
0.5P + 0.3Y + 0.01Z = W/C x P
0.1P + 0.3Y + 0.1Z = W/C x P
For construction of structures in sea water, the cement generally preferred to, is
low heat Portland cement
None of these.
quick setting cement
rapid hardening cement
Portland-pozzolana cement
M10 grade of concrete approximates
1 : 1.5 : 3 mix
1 : 1 : 2 mix
1 : 3 : 6 mix
None of these.
1 : 2 : 4 mix
If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed
15 cm
10 cm
20 cm
25 cm
30 cm
Water cement ratio is
weight of concrete to that of water
volume of concrete to that of water
volume of water to that of cement
weight of water to that of cement
both (a) and (b) of the above.
Under normal conditions using an ordinary cement, the period of removal of the form work, is
21 days for bottom beams over 6 m spans
All the above.
2 days for vertical sides of columns
7 days for beam soffits
14 days for bottom slabs of spans 4.6 m and more
Hydration of cement is due to chemical action of water with
Dicalcium silicate and tricalcium aluminate
Tricalcium aluminate and tricalcium alumino ferrite
Tricalcium silicate and dicalcium silicate
All the above.
To ensure constant moisture content in aggregates
aggregate pile should be left for 24 hours before aggregates are used
height of each aggregate pile should not exceed 1.50 m
area of each aggregate pile should be large
conical heaps of aggregates should be avoided to prevent moisture variation
All the above.
The ratio of the length to breadth of a wooden float, is
4.5
8.5
6.5
7.5
5.5
In the method of voids for determination of the quantity of cement paste, it is assumed that
Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
All the above.
Voids in fine aggregates are filled by the cement paste
Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
Voids in coarse aggregates are filled by fine aggregates
The cement becomes useless if its absorbed moisture content exceeds
1%
5%
2%
3%
4%
Pozzolana cement is used with confidence for construction of
abutments
massive foundations
All the above.
Dams
R.C.C. structures
The type of aggregates of same nominal size, which contain less voids when compacted, are
rounded spherical
irregular
None of these.
flaky
Log Angles machine is used to test the aggregate for
impact value
water absorption
None of these.
crushing strength
abrasion resistance
The impurity of mixing water which affects the setting time and strength of concrete, is
sodium sulphates
sodium chlorides
calcium chorides
calcium bicarbonates
sodium carbonates and bicarbonates
'Ware house pack' of cement means
None of these.
full capacity of the ware house
packing the ware house
pressure exertion of the bags of upper layers
pressure compaction of the bags on lower layers
The mixture of different ingredients of cement, is burnt at
1400°C
1000°C
1600°C
1800°C
1200°C
The datum temperature for maturity by Plowman, is
- 5.6°C
23°C
- 11.7°C
0°
For preparing a test-specimen, it is necessary
to mix water to the cement, fine aggregates and coarse aggregates
All the above.
to mix cement and fine aggregate by dry hand
to mix coarse aggregates
to oil inner surface of the mould and the base plate, before placing concrete
The ratio of various ingredients
(cement, sand, aggregates) in concrete of grade M 200, is
4 : 2 : 1
1 : 1 : 2
1 : 3 : 6
1 : 2 : 4
A flaky aggregate is said to be elongated if its length is
four times the mean size
five times the mean size.
twice the mean size
thrice the mean size
equal to the mean size
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