III Semester M.E. (Civil) Degree Examination, January/February 2014 Structural Engineering 2K8 SE 303 – Elective : RESTORATION AND REHABILITATION OF STRUCTURES [Stru/PSC/EQ/CT] Time : 3 Hours
Max. Marks : 100
Note : 1) Answer any five full questions. 2) Draw neat sketches wherever necessary. 1. a) Define durability of concrete. Explain its importance with respect to the performance of structure.
8
b) Explain the external factors influences the durability of concrete.
12
2. a) Explain how the condition of the existing distress in structure is recorded in field. 12 b) Explain the laboratory tests used for assessing causes of distress.
8
3. a) Explain the electro-chemical process of corrosion of steel in RC structures. b) How is corrosion of steel in RC structures diagnosed ? What are the preventive measures taken to control the corrosion ?
10
4. a) Explain the classification of cracks and how the cracks can be measured and reported ?
10
b) Explain the strengthening techniques with external reinforcement.
10
5. a) Explain the classification of repair materials with selection criteria.
10
b) Explain about the durability related tests for repair materials.
10
6. a) Explain with sketches the retrofitting of damaged RC members by polymer modified concrete and ferrocement. b) Explain the method of repairing structures by sticking and Jacketing.
10
10 10
P.T.O.
*JUP026*
JUP – 026
7. a) How do you repair the structures in distress due to chemical attack ?
10
b) Explain cementitions and resin repair mortars as repair materials.
10
8. Write short notes on any four of the following : a) Carbonation of concrete b) Alkali silica reaction c) Sulphate attack d) Permeability of concrete e) Sealing materials.
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