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10000CE467122001

summer mid day is 15.8°C. Spacing between transverse joint is 5m and between
longitudinal joint is 3.5m. Wheel load is 4800kg, radius of loaded area is 15cm,
E=3x10° kg/ ണ്‌, 0.15, e=10x10° 70. Calculate the worst combination of
stresses at edge and corner using IRC charts and Bradbury’s stress coefficients.
Compare warping stresses and frictional stresses in rigid pavements.

Define the following terms with respect to rigid pavements:

(1) Radius of relative stiffness (11) Modulus of subgrade reaction (114) Equivalent
radius of resisting section (iv) Wheel load stresses

A subgrade soil has the following properties:

Soil passing 0.074 mm sieve = 60%, Liquid limit = 55%, Plastic limit = 45%
Design a flexible pavement section using the GI method for heavy traffic with
over 400 commercial vehicles per day.

PART C
Answer any two full questions, each carries 20 marks.
Outline the procedure for determining the thickness of the CC pavement as per

IRC 58: 2002 guidelines.

What are the assumptions made while deciding with the spacing of dowel bars?
Also, with the help of a neat sketch explain the need of a dowel bar in transverse
joints of rigid pavements.

Explain the principle and procedure of Benkelman Beam test.

What are the structural and functional requirements of a flexible pavement?
What are quality control tests for a rigid pavement?

Design the dowel bar system for expansion joint of a cement concrete pavement
as per the guidelines of IRC: 58- 2002 guidelines, given:

Slab thickness = 35 cm, Joint width = 2 cm, Characteristic compressive strength
of cement concrete = 400 kg/cm’, Design wheel load = 8000 kg, Modulus of
elasticity of dowel bar = 2 x 10° kg/cm’, Modulus of elasticity of concrete = 3 x
10° kg/em?, Modulus of dowel to concrete interaction =41500kg/cm*, Radius of
relative stiffness = 100 cm.

What are the applications of geosynthetics in highway pavements?

What is meant by pavement overlay? What are the different types of pavement

overlay? Mention one method of design of overlay over flexible pavements.

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