Download GTU B.Tech 2020 Winter 8th Sem 2180607 Repairs And Rehabilitation Of Concrete Structures Question Paper

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Subject Code: 2180607

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020

Subject Name: Repairs & Rehabilitation Of Concrete Structures

Time: 02:00 PM TO 04:00 PM

Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. (a) Define (i) Repair (ii) Rehabilitation (iii) Retrofitting [03]
2. (b) Attempt Following: [04]
   1. Main reason of crack in concrete during fresh stage of concrete is __________. (Plastic shrinkage, Drying shrinkage)

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   2. The freezing water in pores of concrete expands about ______% in volume as it is converted to ice. (5, 9, 15)
   3. In R.C.C. alkalinity of concrete should be maintained above ______ to prevent corrosion. (10.0, 11.5, 12)
   4. The sulphate attack can be controlled by use of __________. (Pozzollan, Air entrainment, high alumina).
3. (c) What is condition assessment? What are the objectives of it. Explain various stages of it in detail. [07]

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Q.2

1. (a) Enlist causes of distress in reinforced concrete structures. [03]
2. (b) Write short note on Windsore probe test. [04]
3. (c) Explain the restoration of earthquake damaged masonry structures. [07]

Q.3

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1. (a) Enlist various types of waterproofing materials. [03]
2. (b) Write short note on ‘Vacuum Concrete. [04]
3. (c) What is Jacketing. Explain Column Jacketing in detail with neat sketch. [07]

Q.4

1. (a) Explain annual repairs and day to day repair. [03]

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2. (b) Write short notes on Pull out test. [04]
3. (c) Enlist and Explain long term health monitoring techniques. [07]

Q.5

1. (a) Write short note on: Foamed concrete. [03]
2. (b) Explain polymer impregnated concrete. [04]

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3. (c) Discuss Underpinning for foundation rehabilitation in detail. [07]

Q.6

1. (a) Explain differential thermal analysis technique for fire damage assessment. [03]
2. (b) Explain alkali-silica reaction. [04]
3. (c) List various techniques for crack repair. Explain grouting in detail. [07]

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Q.7

1. (a) Enlist essential parameters of good repair material. Explain any one in detail. [03]
2. (b) Explain factors affecting corrosion of reinforcement in concrete. [04]
3. (c) Explain method of wrapping for retrofitting of structure. List the materials used for wrapping for an existing reinforced concrete beam. [07]

Q.8

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1. (a) Write short note on : Crack sealing materials. [03]
2. (b) Explain the method of cathodic protection of reinforcement. [04]
3. (c) What is meant by carbonation of concrete? What are the factors affecting it? How it is determined in concrete? [07]

Date: 21/01/2021

Total Marks: 56

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