This document is a past exam for a Transportation Engineering and Management course. It consists of 7 questions testing knowledge of pavement engineering and drainage systems. Question 1 involves advantages of full depth asphalt pavement, calculating required pavement thickness, and stress/strain relationships. Question 2 involves designing flexible pavement sections using AASHTO and IRC methods. Question 3 involves designing a rigid pavement given parameters like traffic load, concrete properties, and joint spacing. Question 4 defines drainage components and uses deflection testing to calculate overlay thickness. Question 5 involves designing a pipe culvert for a road. Question 6 covers design parameters for rigid pavement and designing a tie bar system. Question 7 requires short notes on fixed traffic models, concrete pavement defects, and culvert selection

1. Nepal Engineering College
Re-Assessment January 2014
Level: M.Sc. Full Marks: 100
Program: Transportation Engineering and Management Pass Mark: 60
Course:TRP 614.3 Pavement Engineering and Drainage System (Elective) Time: 4 Hrs
Year/Semester: II/I
 IRC: 58 - 2002 and IRC: 37 - 2001 and AASHTO graphs are allowed to use.
Q. No. 1 a Write down the advantages of full depth asphalt pavement according to AI and
benefits of the CRAM section.
5
b A circular load with a radius of 6.5 in. and a uniform pressure of 80 psi is applied
on a two-layer system, as shown in figure. The subgrade has an elastic modulus
of 12,000 psi and can support a maximum vertical stress of 16 psi. If the HMA
has an elastic modulus of 600,000 psi, what is the required thickness of a full
depth pavement? (refer chart 1 given below)
6.5 in
h =?
E2 = 12000 psi
E1 = 600, 000 psi
80 psi
psic 16
10
Q. No. 2 a A pavement has to be designed for a certain length of existing single lane
carriage way road from the following consideration:
1. Current traffic of 80kN equivalent single axle load = 9.5x104
ESAL/year
2. Design period = 10 years
3. Construction period = 18 months from the last traffic count
4. Traffic growth rate = 7.0%
5. CBR value of sub-grade soil =5%
6. Elastic modulus of asphalt concrete for surface course = Eac=2100MPa
7. Elastic modulus of emulsified stabilized base = Eb=1200MPa
8. Elastic modulus of granular sub-base = Esb=140MPa
Draw the cross section of final pavement layers considering the thickness of
asphalt concrete on surface course is not less than 75mm (refer chart 2)
10
OR
b Design the pavement for construction of a new road section with the following
data by IRC-2001 method:
i. Two lane carriage way
ii. Initial traffic in the year of completion of construction = 380 CVPD
(sum of both directions)
iii. Traffic growth rate = 7.5 %
iv. Design life = 12 years
v. Vehicle damage factor based on axle load survey = 3.3 standard axle per
commercial vehicle
vi. Design CBR of subgrade soil = 5%.
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c Explain the general design procedure for designing flexible pavement by
AASHTO method.
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2. Q. No. 3 A cement concrete pavement is to be designed for a two-lane two-way national
highway. The total two-way traffic is 3200 com. vehicles per day at the end of the
construction period. The design parameters are :
 Flexural strength of cement concrete = 45 kg/cm2
 Effective modulus of subgrade reaction =8kg/cm3
 Elastic modulus of concrete = 3x105
kg/cm2
 Poisson’s ratio = 0.15
 Thermal coefficient of concrete = 10x10-6
/0
C
 Rate of traffic increase = 0.075
 Spacing of contraction joints = 4.0
 Width of slab = 3.6m
 Temperature differential for region =240
C
 The 98th
percentile axle load =16 tones.
Single axle load Tandem axle load
Axle load
class, tons
Percentage of
axle loads
Axle load
class, tons
Percentage of
axle loads
17-19
15-17
13-15
11-13
9-11
Less than 9
1.3
2.2
12.3
26.0
24.5
26.0
34-36
28-30
22-24
18-22
14-18
Less than 14
0.2
0.5
0.5
1.6
2.2
2.7
Total 93.4 Total 7.7
15
Q. No. 4 a Define surface and sub-surface drainage. Write down the importance and
requirements of highway drainage system.
5
b Existing black top pavement was tested using Benkelman Beam with a test
vehicle of 8170 kg rear axle load. Observations recorded at a pavement
temperature of 410
C are given below.
1.48, 1.42, 1.46, 1.52, 1.62, 1.64, 1.75, 1.66, 1.75, 1.81, 1.58, 1.43, 1.28, 1.36
Compute the thickness of overlay of bituminous concrete, taking allowable
deflection as 1.25mm, if the factor for subgrade moisture correction is 1.3.
Assume an equivalency factor of 0.7 for bituminous concrete overlay.
10
Q. No. 5 a Design a pipe culvert trough a road embankment of height 6 m, the width of
road is 7.5 m and formation width is 12 m. The side slope of the embankment is
1.5:1.
The maximum discharge is 4 m3/s, the safe velocity is 2.8m/sec. Class AA
tracked vehicle (axle load 70 T) is to be considered as live load. Assume sharp
edged entry. Given Ce =1.5, Cs = 0.010 and unit weight of soil = 18 KN/m. take
edge bearing resistance as 68 KN/m.
15
Q. No. 6 a Explain the various design parameters involved in AASHTO method for
designing rigid pavement.
5
b Design a tie bar system for a concrete pavement,given
Slab thickness h=28cm
Slab width b=3.6m
Number of lanes to be tied =2
Coefficient of friction between slab and subgrade =1.5
Weight of slab=480kg/m2
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3. Allowable tensile stress
i. in plain bars l = 1250 kg/cm2
ii. in deformed bars = 2000 kg/cm2
Maximum permissible bond stress:
i. Plain bars= 17.5 kg/cm2
ii. Deformed bars=24 kg/cm2
(Assume dia. of bar to be 12mm)
Q. No. 7 Write short Notes (any Two) 5X2 10
a Fixed traffic and fixed vehicle
b Defects on concrete pavements
c Culvert location and selection
Chart. 1

4. Chart. 2
Best of Luck!!