WorksheetsQuiz on 1st and 2nd module
Total questions: 27
Worksheet time: 14mins
For quality control of Portland cement, the test essentially done is
setting time
soundness
tensile strength
consistency
all the above
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,
20%
25%
30%
35%
For given water content, workability decreases if the concrete aggregates contain an excess of
thin particles
flat particles
elongated particles
flaky paticles
all the above.
M10 grade of concrete approximates
1:3:6 mix
1:1:2 mix
1 : 2 : 4 mix
1 : 1.5 : 3 mix
none of these.
For ensuring quality of concrete, use
single sized aggegates
two sized aggregate
graded aggregates
coarse aggregates.
The risk of segregation is more for
wetter mix
larger proportion of maximum size aggregate
coarser grading
all the above.
Hydration of cement is due to chemical action of water with
Tricalcium silicate and dicalcium silicate
Dicalcium silicate and tricalcium aluminate
Tricalcium aluminate and tricalcium alumino ferrite
All the above
An aggregate is said to be flaky if its least dimension is less than
1/5th of mean dimension
2/5th of mean dimension
3/5th of mean dimension
4/5th of mean dimension
none of these
The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known
grading
curing
mixing
batching
none of these
Pick up the correct statement from the following:
Insufficient quantity of water makes the concrete mix harsh
Insufficient quantity of water makes the concrete unworkable
Excess quantity of water makes the concrete segregated
Excess quantity of water causes bleeding in concrete
All the above
Pick up the correct proportions of chemical ingredients of cement
Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3
Transport of concrete by pumps, is done for a distance of
100 m
200 m
300 m
400 m
Vicat's apparatus is used for
fineness test
consistency test
soundness test
compressive strength test
Workability of concrete is measured by
Vicat apparatus test
Slump test
Minimum void method
Talbot Richard test.
The process of hardening the concrete by keeping its surface moist is known
placing
wetting
curing
compacting
none of these.
Specified compressive strengh of concrete is obtained from cube tests at the end of
3 days
7 days
14 days
21 days
28 days
The compaction of concrete, improves
density
strength
durability
all the above.
Segregation is responsible for
honey-combed concrete
porous layers in concrete
surface scaling in concrete
sand streaks in concrete
all the above.
The factor which affects workability, is
water content and its temperature
shape and size of the aggregates
grading and surface textures of the aggregates
air entraining agents
all the above.
Concrete gains strength due to
chemical reaction of cement with sand and coarse aggregates
evaporation of water from concrete
hydration of cement
All the above.
Log Angles machine is used to test the aggregate for
crushing strength
impact value
abrasion resistance
water absorption
none of these.
If fineness modulus of sand is 2.5, it is graded as
very fine sand
fine sand
medium sand
coarse sand
very coarse sand.
Workability improved by adding
fly ash
hydrated lime
calcium chloride
bentonite
all the above
The strength and quality of concrete, depend upon:
grading of aggregates
surface area of aggregates
shape of aggregates
surface texture of aggregates
all the above
The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
30 minutes
60 minutes
40 minutes
75 minutes
90 minutes
To prevent segregation, the maximum height for placing concrete, is
100 cm
125 cm
220 cm
225 cm
In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
25 times
20 times
30 times
22 times
