This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Planning and Design of Concrete Repair”.
1. Even the best attempt to repair the concrete fails if the wrong materials are used.
a) True
b) False
View Answer
Explanation: When planning to repair concrete we must be careful with the materials that are used for the repair if not the strategy that are adopted may turn controversial due to the poor choice of material.
2. The modulus of elasticity of repair material used should be _______ to that of the concrete substrate during repair.
a) similar
b) lower
c) higher
d) relatively higher
View Answer
Explanation: During any repair the modulus of elasticity of repair material should be similar to that of the concrete substrate to permit the uniform load transfer across the repaired section.
3. Clear spacing that is provided between the ribs in joist construction should not be more than ________ inches.
a) 40
b) 15
c) 30
d) 50
View Answer
Explanation: The clear spacing that is to be provided between the ribs in joist construction should not be more than 30 inches in order to allow safe transfer of loads.
4. Which of the following is not the result of using polymer as a repair material for thermal expansion?
a) Spalling
b) Cracking
c) Delamination
d) Carbonation
View Answer
Explanation: When polymer is used as repair material for thermal expansion cases then spalling, cracking and Delamination occurs because polymer has high thermal expansion co-efficient when compared with concrete.
5. Repair material used should be of similar compressive strength of the concrete.
a) True
b) False
View Answer
Explanation: The repair material that is used for repair should be of the same compressive strength of the concrete. But in cases where the eroded concrete is to be repaired then the repair material used should be of greater compressive strength than the existing concrete.
6. The coefficient of thermal expansion of polymer is _______ times greater than that of concrete.
a) 10
b) 14
c) 5
d) 15
View Answer
Explanation: The coefficient of thermal expansion of polymer is 14 times greater than that of concrete and so they are more vulnerable to shrinkage and spalling.
7. __________ acts as key element in successful repair strategy.
a) Visual inspection
b) Petrographic examination
c) Acoustic mapping
d) Bonding
View Answer
Explanation: Bonding between the material used for repair and the concrete is the key element for any repair technique to meet its success. This bonding is effectively achieved with the help of polymer adhesives.
8. In T-beam the flange and web must be built integrally.
a) True
b) False
View Answer
Explanation: In T-beam the flange and web must be built integrally so as to ensure the effective bond between the flange and the web.
9. Polymer adhesives provide a better bond than any other adhesives.
a) True
b) False
View Answer
Explanation: Since polymer adhesives have better expansion they can bond effectively between old and new concrete. So they are considered a better choice than any other adhesives.
10. Which of the following is the factor that is not to be considered while planning a repair?
a) Geometry
b) Traffic
c) Temperature
d) Stability analysis
View Answer
Explanation: Stability analysis is not to be considered when planning for repair. But the remaining factors like geometry, traffic and temperature are to be considered while planning for a repair.
11. Depth of the concrete repair is one of the major considerations.
a) True
b) False
View Answer
Explanation: The material to be used during a concrete repair completely depends on the depth of the concrete which is affected and which is to be repaired.
12. A minimum of three numbers of longitudinal bars are used in _________ member.
a) compression
b) tension
c) vertical
d) horizontal
View Answer
Explanation: The minimum of three number of longitudinal bars are used in compression members so as to provide the exact compression that is required by the member to maintain its stability.
Sanfoundry Global Education & Learning Series – Repair and Rehabilitation of Structures.
To practice all areas of Repair and Rehabilitation of Structures, here is complete set of Multiple Choice Questions and Answers.
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