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Posted Date: 01 Jul 2009 Posted By: Sunil Reddy Member Level: Platinum
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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
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) Briefly explain the various factors to be considered in the design of pavements. [6 marks]
b) Calculate the ESWL of a dual-wheel assembly carrying 2040 kg, for pavement
thicknesses of 20cms, 25cms and 40cms. The center to center distance between tyres is 27
cm and clear distance between the walls of the tyres is 10 cm. [10 marks]
2. a) Write a short note on the design of flexible pavements using the Group Index Method and
the CBR method? [8 marks]
b) Wheel load = 4000kg, tyre pressure = 5 kg/cm2. A plate bearing test was conducted on
the subgrade soil using a 30cm diameter plate, which yielded a pressure of 2 kg/cm2, after
10 repetitions of load at 0.5cm deflection. Design a highway pavement using the data given
above. [8 marks]
3. a) State the assumptions made in Boussinesq’s method of analysis? Discuss the limitations
of using this method in the analysis of stresses in a soil mass? [6 marks]
b) Determine the intensity of vertical pressure and horizontal shear stress at a point 5m
directly below a 4500kg point load acting at a horizontal ground surface. What will be the
values of vertical pressure and shear stress at a point 1.5m horizontally away from the axis
of loading at same depth? [10 marks]
4. a) Calculate the 10-year equivalent wheel load and traffic index values using the following
AADT data
Number of axles 2 3 4 5
AADT (two directions) 3700 350 300 90
Assume 50% increase in traffic in a 10-year period.
b) Calculate the equivalent cohesiometer value, of a three-layered pavement section having
individual cohesiometer values as given below. [8 marks]
Materials Bituminous concrete Cement-treated base Gravel sub-base
Thickness (cm) 10 25 15
Cohesiometer value 65 220 26
5. a) Write short notes on the foundation surface characteristics and design strength of
concrete using the IRC recommendations for the design of rigid pavements. [8 marks]
b) Briefly describe the critical combination of stresses due to wheel load and temperature
effects? [8 marks]
6. a) Determine the spacing between contraction joints for a 3.5m slab width having thickness
of 20cm. Consider the following cases: (i) for reinforced cement concrete (ii) for plain
cement concrete. Coefficient of friction = 1.5, unit weight of slab = 2500 kg/m3, allowable
stress in tension in cement concrete = 1.6kg/cm2, allowable tensile stress in steel = 1200 kg/
cm2, unit weight of steel = 7500 kg/m3, factor of safety = 2. The total reinforcement of 6kg/
cm2 is provided and is equally distributed in both directions. [8 marks]
b) Compute the equivalent radius of resisting section of 20cm slab, given that the ratio of
radius of wheel load distribution to the thickness of slab is 0.45. Also compute the distance
from the apex slab corner to the section of maximum stress along the corner bisector, given
that the radius of relative stiffness is 67cm. [6 marks]
c) The width of the expansion joint gap is 2.5cm in a CC pavement. If the laying
temperature is 150C, and the maximum slab temperature in summer is 550C, calculate the
spacing between expansion joints. Assume coefficient of thermal expansion of concrete as 1
x 10-6 per 0C. [2 marks]
7. There are two phases in a highway construction project. What are they, explain them in
detail. [16 marks]
8. What are the various types of failures in flexible pavements? Explain the causes?
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