Concrete Technology Questions and Answers – Symptoms and Diagnosis of Distress

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Symptoms and Diagnosis of Distress”.

1. Symptoms for acid attack?
a) It will show disintegration of the concrete evidenced by loss of the cement paste
b) It will show concrete surfaces that are very rough in areas where the paste is leached
c) Affected concrete does not exhibit telltale features too distinctly
d) Expansion does not occur without reaction products
View Answer

Answer: a
Explanation: Acid attack will show disintegration of the concrete evidenced by loss of the cement paste.

2. Symptoms for aggressive water attack?
a) It will show disintegration of the concrete evidenced by loss of the cement paste
b) It will show concrete surfaces that are very rough in areas where the paste is leached
c) Affected concrete does not exhibit telltale features too distinctly
d) Expansion does not occur without reaction products
View Answer

Answer: b
Explanation: It will show concrete surfaces that are very rough in areas where the paste is leached.

3. Symptoms for aggressive ACR reaction?
a) It will show disintegration of the concrete evidenced by loss of the cement paste
b) It will show concrete surfaces that are very rough in areas where the paste is leached
c) Affected concrete does not exhibit telltale features too distinctly
d) Expansion does not occur without reaction products
View Answer

Answer: c
Explanation: ACR affected concrete does not exhibit telltale features too distinctly. AAR results in deleterious expansive cracking of concrete occurring at the later ages after construction.
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4. Symptoms for aggressive ASR?
a) It will show disintegration of the concrete evidenced by loss of the cement paste
b) It will show concrete surfaces that are very rough in areas where the paste is leached
c) Affected concrete does not exhibit telltale features too distinctly
d) Expansion does not occur without reaction products
View Answer

Answer: d
Explanation: Harmful ASR expansion does not occur without reaction products. But reaction products can occur without harmful ASR expansion.

5. What should be the minimum water cement ratio?
a) .45
b) .5
c) <.45
d) >.45
View Answer

Answer: c
Explanation: Concrete should be workable with minimum water cement ratio (< 0.45). It should be well compacted by vibrator.
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6. Cement not more than ________ months old should be used.
a) 1
b) 1.5
c) 2
d) 3
View Answer

Answer: d
Explanation: Cement not more than 3 months old should be used. Proper cement to be used to prevent sulphate and chloride attack.

7. Powder epoxy is fusion bonded to bar at about _________0C temperature.
a) 100
b) 250
c) 300
d) 350
View Answer

Answer: b
Explanation: Fusion bonded epoxy coating process has good results in protecting reinforcement bars from corrosion. Powder epoxy is fusion bonded to bar at about 2500C temperature.
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8. At the construction stage, binding wires ____________
a) Should touch the formwork
b) Should not touch the formwork
c) To be turned outside
d) To be turned whole structure
View Answer

Answer: b
Explanation: Binding wires to be turned inside (should not touch formwork). G.I. wires to be used in aggressive environment.

9. Creep is ____ to the strength of concrete.
a) Equal
b) Similar
c) Directly proportional
d) Inversely proportional
View Answer

Answer: d
Explanation: Creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete.
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Sanfoundry Global Education & Learning Series – Concrete Technology.

To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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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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