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Posted Date: 01 Jul 2009 Posted By: Sunil Reddy Member Level: Platinum

2009 Jawaharlal Nehru Technological University Civil Engineering IV B.Tech II Semester Regular Examinations, April/May 2009 JNTU Kakinada, PAVEMENT ANALYSIS AND DESIGN Question paper

Course: B.Tech Civil Engineering

University: Jawaharlal Nehru Technological University

Code No: 2420106
IV B. Tech II Semester Regular Examinations, April/May 2009
PAVEMENT ANALYSIS AND DESIGN
( Civil Engineering )
Time: 3 Hours Max. Marks 80
Answer any FIVE questions
All questions carry equal marks
********
1. a) Calculate the ESWL of a dual-wheel assembly carrying 2080 kg, for pavement
thicknesses of 15cms, 25cms and 50cms. The center to center distance between tyres is
27cm and clear distance between the walls of the tyres is 10cm. [10 marks]
b) Explain Equivalent Single Wheel Load (ESWL) and the concept in the determination of
the equivalent load, with a neat sketch? [6 marks]
2. a) Explain fourth power rule?
b) Define and explain rigidity factor?
c) Plot and explain the relationship between contact pressure and inflation pressure?
[4+4+8 marks]
3. a) Explain and compare the Burmister’s two layer system and Boussinesq’s single layer
system using a neat sketch, with reference to the vertical stress distribution. [8 marks]
b) Calculate the intensity of vertical pressure directly below a wheel load of 4080 kg with a
tyre pressure of 10 kg/cm2 at
i. 2 m depth
ii. 4.5 m depth
iii. 12 m depth and
iv. on the surface of loading. [8 marks]
4. a) Using Kelley’s, Picket’s and Westergaard’s methods (for protected and unprotected
corners) at the corner region of a cement concrete slab, determine the wheel load, using the
data given below
Wheel load = 8400 kg
Pavement slab thickness = 25 cm
Modulus of elasticity of concrete = 3.0 x 105kg/cm2
Modulus of subgrade reaction = 7.2 kg/cm3
Poisson’s ratio of concrete = 0.15
Radius of contact of tyre = 20 cm.
b) Calculate the following
i. equivalent radius of resisting section and
ii. distance from apex of slab corner to section of maximum stress along corner bisection,
using the data given below
Radius of wheel load distribution = 12 cm
Slab thickness = 20 cm
Modulus of subgrade reaction = 2.75 kg/cm3
Poisson’s ratio of concrete = 0.15
Modulus of elasticity of concrete = 2 x 105 kg/cm2 [6 marks]
5. a) Determine the warping stresses at three critical locations of a 25cm concrete pavement
with 15m transverse joints and lane width is 3.5m. The modulus of subgrade reaction is 2.8
kg/cm3. Assume temperature differential for day conditions to be 1oC per cm for computing
warping stresses. Thermal coefficient of concrete = 8 x 10-6 peroC
Modulus of elasticity of concrete = 2.8 x 105kg/cm2
Poisson’s ratio of concrete = 0.15
Radius of tyre contact are = 15 cm [10 marks]
b) Briefly explain the parameters required as input for the rigid pavement analysis?
[6 marks]
6. Write in detail about the various tests on bitumen? [16 marks]
7. Explain in detail the construction of earth roads? [16marks]
8. Explain the principle and uses of Benkelman beam, with the help of a diagram?

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