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Concrete Technology
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Workability of concrete for a given water content is good if the aggregates, are
angular aggregate
flaky aggregates.
rounded aggregate
irregular aggregate
Too wet concrete may cause
lower density
excessive laitance
All the above.
weakness of concrete
segregation
If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is
3000 bags
2000 bags
2400 bags
2200 bags
2700 bags
Ordinary Portland cement is manufactured from
gypsum and lime
lime, pozzolana and clay.
pozzolana
lime stone and clay
A concrete having a slump of 6.5 cm, is said to be
None of these.
earth moist
semi-plastic
dry
Plastic
You are asked to construct a massive dam, the type of cement you will use, is
ordinary Portland cement
white cement.
low heat cement
blast furnace slag cement
rapid hardening cement
If fineness modulus of sand is 2.5, it is graded as
very fine sand
medium sand
fine sand
very coarse sand.
coarse sand
The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
100 kg/cm2
300 kg/cm2
150 kg/cm2
250 kg/cm2
200 kg/cm2
ISI has specified full strength of concrete after
28 days
7 days
14 days
21 days
None of these.
The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning
1 : 4 : 10
1 : 1 : 2
1 : 3 : 6
1 : 2 : 8
1 : 2 : 4
The minimum percentage of chemical ingredient of cement is that of
lime
Silica.
Iron oxide
alumina
magnesium oxide
Slump test is done for
concrete.
lime
clay
Sand
For the construction of cement concrete floor, the maximum permissible size of aggregate, is
8 mm
10 mm
4 mm
6 mm
12 mm
Pick up the incorrect statement applicable to the field test of good cement
The colour of the cement is bluish
When one thrusts one's hand into a bag of cement, one should feel warm
A handful of cement thrown into a bucket of water should sink immediately
By rubbing cement in between fingers, one should feed rough
All the above.
The compaction of concrete, improves
All the above.
strength
density
durability
For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is
10 kg
20 kg
12 kg
14 kg
16 kg
Transport of concrete by pumps, is done for a distance of
None of these.
100 m
200 m
400 m
300 m
The lower water cement ratio in concrete, introduces
smaller creep and shrinkage
All the above.
greater density and smaller permeability
improved frost resistance
greater wear resistance and improved bond strength
For quality control of Portland cement, the test essentially done is
All the above.
soundness
setting time
Tensile strength
consistency
According to the recommendations of IS : 456-1978, the expansion joints
are provided to ensure minimum resistance
All the above.
do not carry reinforcement across them
are provided where plane changes abruptly
are supported on separate columns
Separation of coarse aggregates from mortar during transportation, is known
shrinkage
creeping
bleeding
None of these.
segregation
For the construction of thin R.C.C. structures, the type of cement to be avoided, is
low heat cement
ordinary Portland cement
sulphate resisting cement.
rapid hardening cement
blast furnace slag cement
The most useless aggregate is one whose surface texture is
honey combed and porous.
granular
glassy
Smooth
After casting, an ordinary cement concrete on drying
expands
None of these.
shrinks
Mix
The light weight aggregates are obtained from
volcanic source.
Sedimentary rocks
igneous rocks
Metamorphic rocks
The top diameter, bottom diameter and the height of a slump mould are
20 cm, 10 cm, 30 cm
10 cm, 30 cm, 20 cm
10 cm, 20 cm, 30 cm
30 cm, 20 cm, 10 cm
20 cm, 30 cm, 10 cm
For an ordinary Portland cement
residual does not exceed 10% when sieved through IS Sieve No. 9
soundness varies from 5 to 10 mm
compressive stress after 7 days, is not less than 175 kg/cm2
initial setting time is not less than 30 minutes
All the above.
The bulk density of aggregates, depends upon
compaction
Grading
shape
All the above.
For preparing a test-specimen, it is necessary
to mix water to the cement, fine aggregates and coarse aggregates
to mix cement and fine aggregate by dry hand
All the above.
to oil inner surface of the mould and the base plate, before placing concrete
to mix coarse aggregates
C.R.R.
I. charts are used to obtain a relatioship between strength of concrete and
Workability
grading of aggregate
None of these.
fineness modulus
water cement ratio
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