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Concrete Technology
Comments
Question
According to IS : 382-1963, a good aggregate should be
Options
A. chemically inert
B. sufficiently strong
C. hard and durable
D. all the above.
Correct Answer
all the above.
Concrete Technology problems
Search Results
1. Expansion joints are provided if the length of concrete structures exceeds
Options
A. 10 m
B. 15 m
C. 15 m
D. 35 m
E. 45 m
Show Answer
Scratch Pad
Discuss
Correct Answer: 45 m
2. 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
Options
A. 0.1
P
+ 0.3
Y
+ 0.1
Z
=
W/C
x
P
B. 0.3
P
+ 0.1
Y
+ 0.01
Z
=
W/C
x
P
C. 0.4
P
+ 0.2
Y
+ 0.01
Z
=
W/C
x
P
D. 0.5
P
+ 0.3
Y
+ 0.01
Z
=
W/C
x
P
E. 0.2
P
+ 0.5
Y
+ 0.1
Z
=
W/C
x
P
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.3
P
+ 0.1
Y
+ 0.01
Z
=
W/C
x
P
3. Higher workability of concrete is required if the structure is
Options
A. made with cement concrete
B. thick and reinfored
C. thin and heavily reinforced
D. thick and heavily reinfored.
Show Answer
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Discuss
Correct Answer: thick and heavily reinfored.
4. A flaky aggregate is said to be elongated if its length is
Options
A. equal to the mean size
B. twice the mean size
C. thrice the mean size
D. four times the mean size
E. five times the mean size.
Show Answer
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Discuss
Correct Answer: twice the mean size
5. Setting time of cement increases by adding
Options
A. gypsum
B. hydrogen peroxide
C. calcium chloride
D. sodium oxide
E. none of these.
Show Answer
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Discuss
Correct Answer: gypsum
6. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
Options
A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 15.5 mm
E. 13.5 mm.
Show Answer
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Discuss
Correct Answer: 13.5 mm.
7. Vicat apparatus is used for
Options
A. fineness test
B. consistency test
C. test for setting time
D. test for tensile strength
E. none of these.
Show Answer
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Discuss
Correct Answer: consistency test
8. If fineness modulus of sand is 2.5, it is graded as
Options
A. very fine sand
B. fine sand
C. medium sand
D. coarse sand
E. very coarse sand.
Show Answer
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Discuss
Correct Answer: fine sand
9. For the construction of the retaining structures, the type of concrete mix to be used, is
Options
A. 1 : 3 : 6
B. 1 : 2 :4
C. 1 :
: 3
D. 1 : l : 2
E. 1 : 4 : 8.
Show Answer
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Discuss
Correct Answer: 1 :
: 3
10. Pozzolanic properties exist in
Options
A. shales
B. fly ash
C. pumicite
D. diatomaceous clay
E. all the above.
Show Answer
Scratch Pad
Discuss
Correct Answer: all the above.
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