PPT - Pavement Materials | Transportation Engineering - Civil Engineering (CE) PDF Download

 Page 1


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PAVEMENT MATERIALS
Page 2


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PAVEMENT MATERIALS
Introduction
?
Pavement subjected to various conditions
?
Weather changes
?
Impact loads
?
Imposed loads etc.
?
Should not undergo excessive deformation and settlement
?
Differential settlement – failure of pavement
?
Hence, high compressibility and plastic properties are not 
desirable for pavement construction
?
Good quality soil is required
Page 3


www .justbtech.com
PAVEMENT MATERIALS
Introduction
?
Pavement subjected to various conditions
?
Weather changes
?
Impact loads
?
Imposed loads etc.
?
Should not undergo excessive deformation and settlement
?
Differential settlement – failure of pavement
?
Hence, high compressibility and plastic properties are not 
desirable for pavement construction
?
Good quality soil is required
Pavement Cross section
?
Consists of different layers
?
Embankment
?
Subgrade
?
Subbase
?
Base
?
Wearing course
?
Different types of materials are used depending on the layer 
requirement.
Page 4


www .justbtech.com
PAVEMENT MATERIALS
Introduction
?
Pavement subjected to various conditions
?
Weather changes
?
Impact loads
?
Imposed loads etc.
?
Should not undergo excessive deformation and settlement
?
Differential settlement – failure of pavement
?
Hence, high compressibility and plastic properties are not 
desirable for pavement construction
?
Good quality soil is required
Pavement Cross section
?
Consists of different layers
?
Embankment
?
Subgrade
?
Subbase
?
Base
?
Wearing course
?
Different types of materials are used depending on the layer 
requirement.
?
Soil is the main constituent in Subgrade and embankment
?
Aggregates are used in the Sub base and base layer
?
Aggregates and binding material in the top layer
?
Sub grade and embankment provides support for the 
pavement
?
Different types of failures such as rutting and shoving in the 
flexible pavements, cracking in the rigid (concrete) 
pavements are due to poor subgrade soil.
Page 5


www .justbtech.com
PAVEMENT MATERIALS
Introduction
?
Pavement subjected to various conditions
?
Weather changes
?
Impact loads
?
Imposed loads etc.
?
Should not undergo excessive deformation and settlement
?
Differential settlement – failure of pavement
?
Hence, high compressibility and plastic properties are not 
desirable for pavement construction
?
Good quality soil is required
Pavement Cross section
?
Consists of different layers
?
Embankment
?
Subgrade
?
Subbase
?
Base
?
Wearing course
?
Different types of materials are used depending on the layer 
requirement.
?
Soil is the main constituent in Subgrade and embankment
?
Aggregates are used in the Sub base and base layer
?
Aggregates and binding material in the top layer
?
Sub grade and embankment provides support for the 
pavement
?
Different types of failures such as rutting and shoving in the 
flexible pavements, cracking in the rigid (concrete) 
pavements are due to poor subgrade soil.
Soil
?
Accumulation or deposit of earth material formed by the 
disintegration of rocks
?
Desirable Properties:
?
Stability
?
Incompressibility
?
Permanency of strength
?
Minimum change in volume
?
Good drainage
?
Ease of compaction