Attempt any four.

1 (a)
In a certain project of highway construction the reconnaissance survey has identified three possible alignments. State the important facts that would effect the choice of one particular way in preference to the other.

5 M

1 (b)
What do you mean by 'scouring' and how 'scour depth' is determined?

5 M

1 (c)
Draw a typical cross section of a highway on embankment and show the various flexible pavement layers.

5 M

1 (d)
Observation were recorded in a 100m stretch of the road, the travel time for vehicle to ply this section is as follows:

What would be Time mean speed and space mean speed.

Vehicles | Travel time (sec) |

10 | 12 |

07 | 03 |

30 | 15 |

What would be Time mean speed and space mean speed.

5 M

1 (e)
Differentiate between Radius of relative stiffness and equivalent radius of resisting section.

5 M

2 (a)
Calculate the ESWL for a wheel load of 2050 kg in a dual wheel axle to be applied on a road of 300 mm thick. The distance between centres of wheel to be taken as 250 mm and the edge distance between tyres as 120mm.

8 M

2 (b)
Why is it important for a highway engineer to study the properties and behavior of soil aggregate bituminous materials? State their desirable properties.

12 M

3 (a)
What are the requirements of good joints? Why are joints provided in cement concrete roads?

8 M

3 (b)
Show that the design thickness of a concrete pavement slab is safe for combined laod and temperature stresses for edge loading conditions given the following data.

Design thickness=20 cm, Impact factor=10%, Maximum wheel load =4080 kg, Modulus of elasticity of concrete= 3 × 10

Poisson's ratio of concrete=0.2 slab dimensions=4.5 × 3.8m, Thermal co-eff of concrete= 8 × 10

Design thickness=20 cm, Impact factor=10%, Maximum wheel load =4080 kg, Modulus of elasticity of concrete= 3 × 10

^{5}kg/cm^{2}Modulus of subgrade reaction=6kg /m, Tyre pressure=7kg/cm^{2}Poisson's ratio of concrete=0.2 slab dimensions=4.5 × 3.8m, Thermal co-eff of concrete= 8 × 10

^{-6}/°C, Temperature difference during the day=0.5°C/cm. Allowable flexural strength of concrete=35 kg/cm^{2}L/I (or) W/I | C | L/I (or) W/I | C |

1 | 0.000 | 7 | 1.030 |

2 | 0.040 | 8 | 1.077 |

3 | 0.175 | 9 | 1.080 |

4 | 0.440 | 10 | 1.075 |

5 | 0.720 | 11 | 1.050 |

6 | 0.920 | 12 | 1.060 |

12 M

4 (a)
Speed and delay studies are conducted on a stretxch of road measuring 4 km in NS direction. Form this data determine Journey speed anad running speed of traffic stream in either direction. Determine average values of volume too.

Trip No. | Directions | Journey time | Delay time | Vehicles | ||||

min | sec | min | sec | Overtaking | Overtaken | From opposite direction | ||

1 | N-S | 6 | 35 | 1 | 30 | 5 | 9 | 250 |

2 | S-N | 7 | 00 | 1 | 40 | 6 | 3 | 180 |

3 | N-S | 6 | 50 | 1 | 30 | 5 | 3 | 280 |

4 | S-N | 7 | 50 | 1 | 30 | 2 | 1 | 200 |

5 | N-S | 6 | 00 | 1 | 00 | 3 | 4 | 230 |

6 | S-N | 8 | 15 | 2 | 20 | 2 | 2 | 150 |

7 | N-S | 6 | 25 | 1 | 30 | 2 | 5 | 300 |

8 | S-N | 7 | 30 | 1 | 40 | 3 | 2 | 160 |

15 M

4 (b)
Explain the term traffic volume. Indicate how the traffic volume data are presented and teh results used in trafic engineering

5 M

5 (a)
Benkelman beam deflection studies were carried out on a highway pavement with 50 mm thick bituminous surface course, when the mean pavement surface temperature was 40°C and the field moisture content of subgrade soil was 5.5%. The soil is found to be sandy and the annual rainfall of the region is 950 mm. The characteristic deflection value of the selected sub stretch is found to be 1.32 mm. Determine the corrected deflection value after appling the corrections for temperature and variation in subgrade moisture.

10 M

5 (b)
Enumerate the board classification of maintenance activities.

10 M

6 (a)
State the importance of extra widening required on a horizontal highway pavement. Calculate extra widening required for a pavement of 7.5 m on a horizontal curve of radius 300 m if the longer wheel base of vehicle on the road is 6.5 m. Design speed is 100 km/h. Compare the value obtained with IRC recommendations.

10 M

6 (b)
What is grade compensation in geometric design of highways? Why is it essential on curves? While aligning a hill road with a ruling gradient of 6% a horizontal curve of radius 60 m is encountered. Find the grade compensation and the compensated gradient at curve.

10 M

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