PAVEMENT DESIGN (DOC)
SAMPLE NOTES
SAMPLE NOTES
1.1 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. The
ultimate aim is to
ensure
that the
transmitted stresses due to wheel load
are
sufficiently reduced,
so that they will not exceed
bearing capacity of the
sub- grade. Two types of pavements
are generally recognized as serving
this purpose, namely flexible
pavements and rigid
pavements. This chapter gives an overview
of pavement types, layers, and their functions, and pavement failures. Improper design
of pavements leads to early failure
of pavements affecting
the riding quality.
1.2 Requirements of a pavement:-
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,
• Impervious surface, so that sub-grade
soil
is well protected, and
• Long design life with low maintenance
cost.
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