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F1076 Pages: 3

Design the flexible pavement for the construction of a new highway with the
following data (Follow guidelines as per IRC 37 2012):

Category of road- Four lane dual carriageway

Number of commercial vehicles in the year of completion of construction- 2400
CVPD per direction

Annual growth rate of commercial vehicles-5%

Design life — 15 years

Design CBR value of subgrade soil — 5%

Vehicle damage factor — 3.5

Lane distribution factor — 0.75

For CBR 5%

Traffic 7253 5 10 20 30 50 100
GSB(mm) 250 300 300 300 300 |300
GB(mm) 250 250 250 250 250 250
DBM(mm) 155 70 100 120 125 130
BC(mm) 25 40 40 40 50 50

Briefly illustrate the various steps in construction of a bituminous pavement.
Mention the major failures in flexible pavements and their causes.
PART C
Answer any two full questions, each carries20 marks.

What are traffic characteristics? Explain the influence of different traffic
characteristics on traffic performance.
The average normal flow of traffic on cross roads A and B during design period
are 400 and 250 PCU per hour respectively. The saturation flow values on these
roads are estimated as 1850 and 1400 PCU per hour respectively. The all red time
required for pedestrian crossing is 16 seconds. Design a two-phase traffic signal
by Webster’s method.
Explain following aircraft characteristics and their influence in planning and
design of an airport:

(i) Type and size of aircraft

(ii) Weight and wheel configuration

(iii) 2 Speed of aircraft

(iv) Minimum turning radius

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