This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Evaluation of Concrete in Concrete Structures”.
1. Core drilling is an expensive method to test concrete.
a) True
b) False
View Answer
Explanation: Core drilling is the expensive method to test concrete because it requires a lot of costly equipment for the testing to be carried out and also it includes laboratory testing which is again costlier.
2. Which of the following is the potential defect that is to be checked for during a joint inspection?
a) Spalling
b) Erosion
c) Cavitations
d) Seepage
View Answer
Explanation: Spalling is the potential defect that is to be checked for during joint inspection because any defect that is encountered in any point of the joint can lead to spalling if the concrete that is present in the structure and so it is to be checked carefully.
3. Which of the following is the sign for carrying out core cutting in concrete structures?
a) Pattern cracking
b) Corrosion
c) Seepage
d) Cavitations
View Answer
Explanation: In pattern cracking, the cracks appear to be very short and so they must be analyzed with the technique that can identify their minute nature and so core cutting is to be adopted.
4. For massive structure, the core cutting is done to a depth of ______ feet.
a) 2
b) 5
c) 1
d) 3
View Answer
Explanation: For massive structure, the core cutting is done to a depth of 2 feet because they are heavy structures and should be examined deeply for understanding the nature of damage to the building.
5. The depth of core drilling depends on the structure.
a) True.
b) False
View Answer
Explanation: Core drilling is mainly adopted during the evaluation of concrete and the depth of it depends on the structure that is about to be examined. For massive structure, the depth of excavation is larger when compared with that of the small structure.
6. The diameter of the core sample should be ____ times the nominal size of the aggregate.
a) 2
b) 3
c) 4
d) 5
View Answer
Explanation: The diameter of the core sample should be 3 times the nominal size of the aggregate so as to allow easy penetration of the core into the concrete structures without allowing the coarse aggregate to obstruct them.
7. ___________ is a major part of core cutting.
a) Rebar inspection
b) Grade of concrete inspection
c) Bore hole camera
d) Joint inspection
View Answer
Explanation: Bore hole camera is a major part of core cutting where the minute details of the inner layer could be obtained from the images that are captured by the bore hole camera.
8. Core samples should be properly stored for the laboratory results.
a) True
b) False
View Answer
Explanation: The core samples should be properly labeled oriented and must be stored for a future laboratory test and also the test results should be properly maintained for historical reference.
9. Underwater vehicles are used to investigate the submerged concrete structures.
a) True
b) False
View Answer
Explanation: Scuba divers use underwater vehicles to inspect the submerged concrete structures that are present in muddy water but in case of clear water visual inspection can be done.
10. High resolution mapping system is used to check ___________
a) seepage
b) cavitations
c) erosion
d) scaling
View Answer
Explanation: High resolution mapping system is used to check erosion that works in depth up to 5 to 40 feet to give the details of the erosion that occurs in the rebars.
11. Darkened and shadows are used for evaluation in _________
a) visual inspection
b) high resolution mapping
c) site inspection
d) side scanner
View Answer
Explanation: Darkened areas and shadows are used for evaluation in side scanner where the depth of the cracks can be calculated with the width of the shadows.
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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