About pavement and it's types with comparison

1. CIVIL ENGINEERING DEPARTMENT
SEMINAR PRESENTATION
UNDER THE GUIDANCE OF:
Prof. A.S.BAGI
PRESENTED BY: MUZAMMIL ZARTAB INAMDAR
USN : 2BL16CV050

2. Seminar Title :
 TYPES OF PAVEMENTS

3. CONTENTS:
 Introduction
 Requirements of a pavements
 Types of pavements
 Comparison

4. Introduction :
A highway pavement
is a structure consisting of superimposed
layers of processed materials above the
natural soil sub-grade, whose primary
function is to distribute the applied vehicle
loads to the sub-grade. The pavement
structure should be able to provide a
surface of acceptable riding quality,
adequate skid resistance, favorable light
reflecting characteristics, and low noise
pollution.

5. Requirements of a
pavements:An ideal pavement should meet the following requirements:
 Sufficient thickness to distribute the wheel load stresses
to a safe value on the sub-grade soil,
 Structurally strong to withstand all types of stresses
imposed upon it,
 Adequate coefficient of friction to prevent skidding of
vehicles,
 Smooth surface to provide comfort to road users even at
high speed,
 Produce least noise from moving vehicles,
 Dust proof surface,
 Impervious surface, so that sub-grade soil is well
protected,
 Pavement surface should be skid resistance, and
 Long design life with low maintenance cost.

6. Types of pavements :
PAVEMENTS
FLEXIBLE
PAVEMENT
RIGID PAVEMENT

7. Flexible pavement:
 Flexible pavements are those, which on the whole
have low or negligible flexural strength and are
rather flexible in their structural action under loads.
 The flexible pavement layers transmit the vertical or
compressive stresses to the lower layers by grain to
grain transfer through the points of contact in the
granular structure
 The vertical compressive stress is maximum on the
pavement surface directly under the wheel load and
is equal to contact pressure under the wheels. Due
to the ability to distribute the stress to large area in
the shape of truncated cone, the stresses get
decreased in the lower layer

8. Flexible Pavement
(Continue)

9. Flexible Pavement
(Continue)
 Bituminous concrete is one of the best
flexible pavement layer material.
 The flexible pavement may be constructed in
number of layers and the top layer has to be
strongest as the highest compressive
stresses are to be sustained by this layer.
 A typical flexible pavement consists of four
components (i)soil sub-grade (ii) sub-base
course (iii) base course and (iv) surface
course

10. Structure of rigid
pavement:

11. Rigid pavement:
 Rigid pavements are those which
possess note worthy flexural strength or
flexural rigidity.
 The stresses are not transferred from
grain to grain to the lower layers as in
the ease of flexible pavement layers.
 The rigid pavements are made of
portland cement concrete either plain,
reinforced or prestressed concrete.

12. Rigid pavement
(continue):
 The pavement structure distributes loads
over a wide area.
 Rigid pavement laid as a single layer by
‘concrete paver’

13. Structure of Rigid
pavement :

14. Comparison:
Flexible pavements Rigid pavements
•Bituminous surface. • concrete surface.
•Load is transfer by grain to grain. •Load transfer is not exists.
•Low strength. •High strength.
•Low life span. •Life span is more.
•Low initial cost
•High maintenance cost.
•High initial cost
•Low maintenance cost .
•Rolling of surface is needed . •Rolling of surface is not needed.
•Stability depends upon the aggregate
interlocking ,particle friction and
cohesion
•Stability depends upon the joints
between the slabs of concrete.