This document provides an overview of flexible pavement construction. It defines flexible pavement as those that reflect deformation through their layers to the surface. The main components of flexible pavement are described as the wearing course, base course, subbase, and subgrade. Details are given on thickness design considerations and materials used for each layer like aggregates, asphalt, and geotextiles. Construction steps are outlined including subgrade preparation through compaction, mixing and spreading course materials, and final compaction and curing. The purpose of the flexible pavement structure is to distribute loads from traffic across its various courses to the underlying subgrade.
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Introduction of Pavement Design
Functions of the Pavement
Requirement of Pavement
Types of Pavement
Component of Flexible Pavement
Load Distribution
types of failure
Introduction to pavement materials. Different types of materials used in the construction of roads and highways. Learn what are different types of materials and what are requirements of materials used in the pavement construction.
Highway Construction Materials and PracticeSenthamizhan M
Sub grade soil is an integral part of the road pavement structure as it provides the support to the pavement from beneath.
The sub grade soil and its properties are important in the design of pavement structure.
The main function of the sub grade is to give adequate support to the pavement and for this the sub grade should possess sufficient stability under adverse climatic and loading conditions.
2.4 HIGHWAY TRANSPORTATION : DESIGN AND CONSTRUCTION OF PAVEMENT (TRE) 315061...VATSAL PATEL
Pavement component functions, factors affecting pavement design and basic pavement design of Flexible and Rigid pavement as per IRC guidelines, Steps for construction of highway on embankment and in cutting. Construction of embankment and subgrade, soil stabilization. Flexible Pavement: Construction of Granular Sub-Base/Drainage layer, Construction of Granular Base Course-WBM and WMM, Construction of bituminous pavement layers- base course and surface course, prime coat and tack coat. Rigid Pavement: Types of cement concrete pavement, components of cement concrete pavement and its functions, construction of cement concrete pavement, joints in cement concrete pavement-function and construction
Introduction of Pavement Design
Functions of the Pavement
Requirement of Pavement
Types of Pavement
Component of Flexible Pavement
Load Distribution
types of failure
Introduction to pavement materials. Different types of materials used in the construction of roads and highways. Learn what are different types of materials and what are requirements of materials used in the pavement construction.
Highway Construction Materials and PracticeSenthamizhan M
Sub grade soil is an integral part of the road pavement structure as it provides the support to the pavement from beneath.
The sub grade soil and its properties are important in the design of pavement structure.
The main function of the sub grade is to give adequate support to the pavement and for this the sub grade should possess sufficient stability under adverse climatic and loading conditions.
2.4 HIGHWAY TRANSPORTATION : DESIGN AND CONSTRUCTION OF PAVEMENT (TRE) 315061...VATSAL PATEL
Pavement component functions, factors affecting pavement design and basic pavement design of Flexible and Rigid pavement as per IRC guidelines, Steps for construction of highway on embankment and in cutting. Construction of embankment and subgrade, soil stabilization. Flexible Pavement: Construction of Granular Sub-Base/Drainage layer, Construction of Granular Base Course-WBM and WMM, Construction of bituminous pavement layers- base course and surface course, prime coat and tack coat. Rigid Pavement: Types of cement concrete pavement, components of cement concrete pavement and its functions, construction of cement concrete pavement, joints in cement concrete pavement-function and construction
Certain Soils don’t permit the construction of specific structures on it. The alternative is to improve the strength of the soil by various methods like:
Mechanical modification
Chemical Modification
Lime stabilization
Geo textile etc.,
Components of highway pavement and materials used. Soil: Importance, Desirable properties, Index properties, Compaction, Strength evaluation tests. Aggregate: Functions, Desirable properties, Tests on road aggregates and quality control. Bituminous binders: Functions, Desirable properties, Tests on bitumen and quality control, Bitumen emulsion functions and classification, Modified bituminous binder functions and classification. Bituminous Mix: Desirable properties and requirement of design mix, general approach for design of bituminous mixes and introduction to Marshall Mix Design Method
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Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
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Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
1. Construction of
Flexible Pavement
BY:
SHILPA KUMTHE FP15054
KIRAN D R FP15056
ARUN RAVINDRANATH FP15058
AJINKYA THAKRE FP15059
NATIONAL INSTITUTE OF CONSTRUCTION MANAGEMENT AND RESEARCH, PUNE.
2. INTRODUCTION
PAVEMENT:-
“Pavement is load bearing and load distributary component of road”
PURPOSE OF PAVEMENT:-
1. LOAD SUPPORT
2. SMOOTHNESS
3. DRAINAGE
4. ALL WEATHER OPERATION
5. DIRECTION AND GUIDANCE
3. TYPE OF PAVEMENT Type of
pavement
Flexible
pavement
Rigid
pavement
1 .FLEXIBLE PAVEMENT:
Those pavements which reflect the deformation of subgrade and the subsequent
layers to the surface.
2. RIGID PAVEMENT: The pavement are associated with rigidity or flexural strength
or slab action so the load is distributed over a wide area of subgrade soil. Rigid
pavement is laid in slabs with steel reinforcement.
4. FLEXIBLE PAVEMENT
THE ADVANTAGES OF FLEXIBLE PAVEMENTS INCLUDE -
Adaptability to stage construction
Availability of low-cost types that can be easily built
Ability to be easily opened and patched
Easy to repair frost heave and settlement
THE DISADVANTAGES INCLUDE -
Higher maintenance costs
Shorter life span under heavy use
Damage by oils and certain chemicals
Weak edges that may require curbs or edge devices
5. THICKNESS DESIGN
Several Procedures are used.
Based on volume and weight of traffic
Load supporting capacity of soil is important.
Heavy vehicle wheel load has greater impact.
Traffic analysis in necessary.
Designs are chosen based on
1) Designed traffic in terms of cumulative numbers of std. axels.
2) CBR value of subgrade.
6. Total thickness of pavement consists of :-
Bituminous Surface (Wearing Course).
Base Course.
Subbase.
Subgrade.
7. WEARING COURSE
Three types of bituminous layers-
1. Bituminous Macadam.
2. Penetration Macadam.
3. Built up spray Grout.
8. BITUMINOUS MACADAM
It consist of crushed aggregate and bituminous binder heated and mixed
in a hot mix plant at specified temperature, transported to the
construction site, laid with a mechanical pawer and compacted by roller.
Material used : Bitumen binder of grade VG -30,20 and Max size of
aggregate 50mm.
9. BITUMINOUS PENETRASION MACADAM.
The coarse aggregate of specified size are first spread and compacted well in dry
state. Compacted thickness 50-75 mm. After compacting of dry aggregates, hot
bituminous binder of specified grade is spread in large quantity on the top of
this layer. Filling up a part of void and binding by key aggregate.
BUILT UP SPRAY GROUT
It consist of a two layer composite construction of compacted crushed stone
aggregate with bituminous binder applied after each layer and key aggregate
placed on the top surface of the second layer.
10. BASE COURSE
The base course is immediately beneath the surface course. It provides
additional load distribution and contributes to drainage and frost resistance.
Base courses are usually constructed out of
AGGREGATES: Base courses are most typically constructed from durable
aggregates that will not be damaged by moisture and frost action.
Aggregates can be either stabilized or un-stabilized.
11. SUB-BASE COURSE
Intermediate layer between subgrade and granular base
course
Essentially a drainage layer
Distributes the stresses imposed by traffic
12. FUNCTION OF SUB-BASE COURSE OF
FLEXIBLE PAVEMENT
It functions primarily as structural support but it can also help:
Minimize the intrusion of fines from the sub-grade into the pavement
structure.
Improve drainage.
Minimize frost action damage.
Provide a working platform for construction.
The subbase generally consists of lower quality materials than the base course
but better than the sub-grade soils.
13. MATERIALS FOR SUB BASE
LOCALLY AVAILABLE MATERIALS
Natural sand
Gravel or moorum
Kankar
Crushed stone
Laterite
INDUSTRIAL WASTE AND OTHER MATERIALS
Steel slag
Pond ash or Pond ash – Bottom ash mix
Crushed concrete
Brick bats
14. SUBGRADE
It forms the foundation of the pavement system
Subgrade soils are subjected to lower stresses than the surface, base, and
subbase courses.
Since load stresses decrease with depth, the controlling subgrade stress
usually lies at the top of the subgrade.
The combined thickness of subbase, base, and wearing surface must be
great enough to reduce the stresses occurring in the subgrade to values
that will not cause excessive distortion or displacement of the subgrade
soil layer.
15. FACTORS TO BE CONSIDERED
General characteristics of the subgrade soils.
Depth to bedrock.
Depth to the water table.
Compaction that can be attained in the subgrade.
CBR values of uncompacted and compacted subgrades.
Presence of weak or soft layers or organics in the subsoil.
Susceptibility to detrimental frost action or excessive swell.
16. METHODS FOR SUBGRADE
PREPARATION
COMPACTION
In fill areas, subgrade below the top 150 mm (6 inches) is often considered
adequate if it is compacted to 90 percent relative density.
In order to achieve these densities the subgrade must be at or near its
optimum moisture content (the moisture content at which maximum density
can be achieved).
Usually compaction of in situ or fill subgrade will result in adequate
structural support.
17. STABILIZATION
The binding characteristics of these materials generally increase subgrade
load-bearing capacity.
Typically, lime is used with highly plastic soils (plasticity index greater than
10), cement is used with less plastic soils (plasticity index less than 10) and
emulsified asphalt can be used with sandy soils.
For flexible pavements, a primecoat is not effective on silty clay or clay
soils because the material cannot be absorbed into such a fine soil (TRB,
2000).
18. OVER-EXCAVATION
The general principle is to replace poor load-bearing in situ subgrade with
better load-bearing fill.
Typically, 0.3 – 0.6 m (1 – 2 ft.) of poor soil may be excavated and replaced
with better load-bearing fill such as gravel borrow.
19. CONSTRUCTION STEPS
1. Preparation of Base
2. Provision of lateral confinement of aggregates
3. Preparation of Mix
4. for small quantity concrete mixer may be used
5. find OMC after replacing retained on 22.4 mm with material 4.75 to 22.4
mm
6. Spreading of Mix
Spreading of mix to be done uniformly / evenly
Should not be dumped in heaps
20. Finishing by Paver /exceptional cases grader
Due importance for segregation
7. Compaction
8to 10 tonne static compactor up to 100 mm
8-10 vibratory roller up to 200 mm
Speed of compactor not to exceed 5 km/hour
Displacement occurring due to roller operations are to be rectified
Use small compactors near kerb/places not assessable to roller
Rolling not be done when subgrade is soft/yielding/causes wave like
motion
21. 8. Any defections on the surface to be rectified
9. Setting and Drying
10. Opening to traffic after sealing