pavement design - 101
TRANSCRIPT
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PAVEMENT DESIGN - 101Why it is Necessary & Factors that Impact
Design
Presented by Andrew LaCroix, PhD, PE
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OUTLINE
Purpose of Pavement Design
Factors of Pavement Design
Example of a Pavement Design
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WHY DESIGN PAVEMENTS?
Traffic
Subgrade
Available Materials
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TRAFFIC
Vehicles
Trucks
Busses
Cars
Speed
Fast - highway
Slow - local
Standing - Intersections 4
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PAVEMENT CLASSIFICATIONS
Roadways
Interstates
Arterial – multilane, limited access
Collectors – connect local and arterial roads
Local – access homes/businesses
Parking Lots
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SUBGRADE (SOILS)
Load Bearing Capacity
Volume Change
Remediation
Stabilization
Remove and Replace
Drainage
Source: petersoncompanies.net
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Pavement Design
- determining pavement thickness
Base on:
Traffic / Loading
Subgrade (soils present)
Pavement materials available
Desired life of pavement
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LIFE CYCLE COST ANALYSIS
Stages
Initial Construction
Expected Life of Pavement
Maintenance
Residual Value
Perpetual Pavement
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Construction Maintenance MaintenanceTime ●●●Time
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PREPARING FOR PAVEMENT DESIGN
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Intended Use
Traffic
Subgrade
Target Lifespan
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PERFORMING PAVEMENT DESIGN
Determine Thickness of Layers
of Pavement
Layered Elastic Calculations
Layer Structural Coefficients
Load Appropriate for Subgrade
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PAVEMENT DESIGN – CASE STUDY
Project
Collector Road in Columbia, MO near
new school
Traffic – 1000 AADT (LEF – 97-2-1)
= 265,000 ESAL
Subgrade – Silty Loam (CBR – 6)
Drainage - Poor
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BACKGROUND INFORMATION
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DESIGN PARAMETERS
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TRAFFIC
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SUBGRADE (SOILS)
MaterialUnified Soil
ClassificationCBR (%)
Resilient
Modulus (ksi)
Crushed Stone GW, GP, GM 20 - 100 20 - 40
Sandy Soil SW, SP, SM, SC 5 - 40 7 - 30
Silty Soils ML, MH 3 - 15 5 - 20
Clay Soils CL, CH 3 - 10 5 - 15
Organic Soils OH, OL, PT 1 - 5 < 5
Source: pavementinteractive.org
Relative Strength
CBR (%)
Weak 3 - 6
Moderate 6 - 9
Good > 9
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SUBGRADE
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LAYER PARAMETERS
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LAYER PARAMETERS
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RESULT
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PAVEMENT DESIGN RESULTS
Flexible Pavement Design
6.0 inch
2.5 inch
2.0 inchAsphalt Surface Mix
Asphalt Base Mix
Aggregate Base
CBR – 50%
Subgrade
Moderate Strength
CBR – 6%
Rigid Pavement Design
0 - 6 inch
Jointed Concrete
Aggregate Base
CBR – 50%
Subgrade
Moderate Strength
CBR – 6%
6.0 inch
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OTHER FACTORS IN PAVEMENT DESIGNConstruction
Base Thickness
Asphalt Layer Thickness
Tack Coat
Environment
Temperature
Moisture
Technology Considerations
Recycled pavement materials (RAP, concrete)
Porous Pavements
Interlayers 22
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PAVEMENT DESIGN CHECKLISTProject Specific Data
Location
Facility Type
Traffic
Subgrade
Layers
Thickness
Materials w/ assumed strengths
Drainage
Target Pavement Life23
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RESOURCES
PAVExpress.com
Missouri Asphalt Paving Association (MAPA)
moasphalt.org
Local Pavement Contractor
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