Highway Ivth Sem Civil

J 3110 B.E/BTech. DEGREE EXAMINATION,MAY/JUNE 2009 Fourth Semester Civil Engineering CE 1255 — HIGHWAY ENGINEERING (Regulation 2004) Time : Three hours

Maximum : 100 marks

Answer ALL the questions. PART A — (10 × 2 = 20 marks) 1. Classify the rural roads as per IRC. 2. Define “Right of Way”. 3. What is meant by exceptional gradient? 4. Differentiate camber from super elevation. 5. What are the components of flexible pavement? 6. What are the stresses produced by temperature in a concrete pavement? 7. Mention any four tests on bituminous materials. 8. What is meant by elongation index? 9. What is called “Scalling” in pavements? 10.State the principles of highway financing.

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PART B — (5 × 16 = 80 marks) 11(a) Briefly highlight the first, second and third twenty year road development plans in India. Or (b) Write short notes on: (i) Jayakar committee (ii) Ideal alignment (iii) GIS and GPS techniques (iv) MORTH 12(a) The speed of overtaking and overtaken vehicles are 80kmph and 50 kmph,respectively, on a two way traffic road. If the acceleration of overtaking vehicle is 0.98m/sec (i) calculate safe overtaking sight distance (ii) mention the minimum length of overtaking zone. (iii)show the positions of the sign posts. Or (b) (i) Explain the methods of widening of pavements on horizontal curves. (ii)Calculate extra widening of pavement required on a horizontal curve of radius 700m on a two lane highway,the design speed being 80kmph.Assume wheel base l=6m. 13(a) Explain the CBR method of pavement design.How will you determine the thickness of component layers? Or (b)(i) A cement concrete pavement of 20cm rests over a WBM base course with modulus of reaction 15kg/cm³.Find the load stresses at the edge and corner regions under a wheel load of 5100kg,by using IRC charts given in fig1 and fig2.(Assume a=15cm,E=3x10^5 kg/cm² and µ=0.15) (ii) Explain the different joints in cement concrete pavements.

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14(a) What are the desirable properties of roed aggregates?Also explain any three tests on road aggregates? Or (b) Write short notes on the following tests on Bituminous materials: (i) Penetrtion test (ii) Ductility test (iii) Viscosity test 15(a) Write short notes on the following pavement failures: (i) Alligator cracking (ii) Reflection cracking (iii) Spalling of Joints. (iv) Mud pumping. Or (b) Explain the method of assessing the overlay thickness required for the flexible pavement.

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