Concrete Technology Questions and Answers – Cracking of Concrete, Evaluation of Cracks

This set of Concrete Technology Questions and Answers focuses on “Cracking of Concrete, Evaluation of Cracks”.

1. How can we prevent cracks in concrete structures?
a) Due to heavy load
b) Low w/c ratio
c) Settlement of structure
d) High water cement ratio
View Answer

Answer: b
Explanation: Low w/c ratio will directly affect the quality of concrete. A lower water cement ratio leads to high strength in concrete therefore lesser cracks.

2. What is the maximum w/c ratio?
a) .2
b) .3
c) .4
d) .5
View Answer

Answer: d
Explanation: Water cement ratio should not exceed .5 in concreting because it will reduces the workability of the concrete.

3. Which can be the possible option for cracking in the building?
a) Due to light load
b) Low w/c ratio
c) Temperature difference
d) Gain of water
View Answer

Answer: c
Explanation: Concrete expands and shrinks when the temperature changes which directly leads to cracking in the building.

4. Is it possible to have 0% crack in our building?
a) Yes
b) No
c) May be
d) Can’t be determined
View Answer

Answer: b
Explanation: It is not possible to have 0 % cracks in any building after construction. We can prevent it but we can’t stop it.

5. Plastic shrinkage cracking occurs in ________ hours after placing.
a) .5
b) 24
c) 10
d) 5
View Answer

Answer: d
Explanation: Plastic shrinkage concrete occurs within 1 hours and 8 hours after placing, when subjected to a very rapid loss of moisture.
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6. Which one can’t be the reason for the shrinkage of concrete?
a) W/c ratio
b) Temperature
c) Cement content
d) Formwork
View Answer

Answer: d
Explanation: Formwork can never cause shrinkage in concrete even it helps to reduce the shrinkage in concrete.

7. Evaluation of cracks ________ be determined before cracking.
a) Can
b) Can’t
c) Sometimes
d) Depends on the structure
View Answer

Answer: a
Explanation: Evaluation of cracks can be determined before cracking i.e., due to plastic and constructional movements.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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