pavement design1.ppt - Rasta Center for Road...

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Rasta - Center for Road Technology (Resource Centre for Asphalt and Soil Training Academy)
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R A S T A Principles of Pavement Design G. Kavitha, Faculty RASTA, Center for Road Technology VTU Extension Center Bangalore
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R A S T A Requirements of Pavements Pavement types and their choice Design factors for flexible pavements Design of flexible pavements by CBR method Outline
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R A S T A Base Black Topping Road Crust Road Composition Vehicle 45 0 Sub Grade 300mm Sub Base Embankment Ground Level
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R A S T A Structural Requirements Traffic loads Load repetition Climatic variables (rainfall & temperature) Environmental factors (water table, embankment)
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R A S T A Functional Requirements Riding comfort Economic operation Safe operation
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R A S T A Pavement Types Flexible pavements Rigid pavements / Cement Concrete (CC) Pavements Semi-rigid / Composite pavements
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R A S T A Stresses in Flexible pavements
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R A S T A Stress distribution through granular layers
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R A S T A Factors affecting the dispersion of compressive stresses Characteristics of materials in each pavement layer Thickness of each layer Loading characteristics
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R A S T A
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R A S T A
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R A S T A Semi Rigid Pavements Intermediate class of materials used in base / sub base course The intermediate materials are – bonded materials like lime fly ash aggregate mix (puzzolanic concrete), lean cement concrete or soil cement They have slightly high flexural strength than the flexible pavements They do not possess as much flexural strength as cement concrete pavements These materials have low resistance to impact and abrasion
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R A S T A Choice Of Pavement Type Initial cost Maintenance cost Total transportation cost Availability of funds
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R A S T A Design Factors For Flexible Pavements Design Wheel Load Sub-grade Support Materials in Pavement Component layers Climatic and Environmental Factors Drainage Characteristics
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R A S T A Load Gross load, ‘P’ Tyre and Contact pressure, ‘p’ or the area of contact, A Multiple wheel load and ESWL Repeated application of wheel loads and EWL factors - P 1 N 1 = P 2 N 2 Cumulative standard axles, CSA in msa Other factors - pavement width lane distribution factor, speed etc.
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R A S T A Subgrade Soil type and index properties Strength properties (CBR, K - value or E-value) Drainage characteristics
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R A S T A Pavement Materials Materials characteristics in different layers (Stress distribution, drainage, strength factor etc) Durability Fatigue effects
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R A S T A Climatic And Environmental Factors Rain fall Depth of water table and relative height of formation Sub-grade moisture content for design Temperature variations - daily and seasonal Frost action
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R A S T A Drainage characteristics effective functioning of : surface drainage system subsurface drainage system
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  • Fall '19
  • Truck, CBR, Subgrade,  Traffic growth rate

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