asphalt pavement design guide - columbia, sc - · pdf fileasphalt pavement design guide for...
TRANSCRIPT
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ASPHALT PAVEMENT DESIGN GUIDE FOR LOW-VOLUME ROADS AND PARKING LOTS
Brad Putman, PhD Associate Professor
Glenn Department of Civil Engineering
South Carolina
Asphalt Pavement Association
Jayson Jordan, PE Technical Director
PART II UPDATE: OVERLAY DESIGN AND CONSTRUCTION
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OVERVIEW
What Is SCAPA?
Part 1: Pavement Design Guide
Part 2: Overlay Design
Wrap Up/Moving Forward
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ELECTION 2016
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FIRST THINGS FIRST
Show of hands:
Have You Heard of SCAPA?
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WHAT IS SCAPA?
The South Carolina Asphalt
Pavement Association
Its membership is comprised of
asphalt pavement producers
and companies affiliated with
the asphalt pavement industry
in South Carolina.
50 Years Old!
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SCAPA CONTRACTOR MEMBERS
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FOCUS ON EDUCATION
Asphalt Pavement Design Guide for Low Volumes and Parking Lots (released in 2014)
Hired Technical Director
Lunch and Learns
Curriculum – Road Rehab Strategies
– Asphalt Topics
The Asphalt Resource For South Carolina!
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WWW.SCASPHALT.ORG - RESOURCE
SCAPA Asphalt Pavement
Design Guide
Asphalt Pavement Alliance
Publications
SCDOT/SCAPA
Best Practices Documents
SC Asphalt Index
PaveXpress
Conference Materials &
Presentations
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PAVING THE WAY:
SCAPA’S E-NEWSLETTER
News and Events
Industry News
Asphalt Resources
– NCAT Reports
– NAPA Publications
Calendar of Events
Asphalt Facts
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SCAPA SOCIAL MEDIA
Facebook, Twitter,
Articles, Reports,
Industry News,
Construction Pictures
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SAVE THE DATE – WEDNESDAY, APRIL 13TH
PaveXpress Seminar
Sandhill REC Lakehouse Columbia, SC
George White, Pavia Systems
http://www.scltap.org/event/pavexpress-seminar/
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ASPHALT PAVEMENT DESIGN GUIDE FOR LOW-VOLUME ROADS AND PARKING LOTS
www.scasphalt.org
“Together we know more”
A resource…here to help
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ASPHALT PAVEMENT DESIGN GUIDE FOR LOW-VOLUME ROADS AND PARKING LOTS
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DESIGN GUIDE SEMINARS
Columbia
Greenville
Rock Hill
Charleston
Myrtle Beach
Florence
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PART 1 OBJECTIVES
By the end of this phase, you should be able to:
– Explain how an asphalt pavement behaves.
– Identify and interpret the inputs needed for asphalt
pavement design.
– Differentiate between different materials used in asphalt
pavement design.
– Design an asphalt pavement structure and select the
appropriate materials.
– Explain how asphalt pavements are constructed.
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ASPHALT PAVEMENT LOADING
Subgrade
Asphalt
Load
Contact Stress (so) = Tire Pressure
so
si = Stress at Subgrade
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DESIGN CONSIDERATIONS
http://www.techwyse.com/blog/search-engine-optimization/6-ways-to-diversify-your-search-engine-traffic/
Traffic
http://www.jgleone.com/recent_projects.htm
Subgrade
http://www.skyscrapercity.com/showthread.php?t=1477797&page=4
Drainage
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DESIGN CONSIDERATIONS [TRAFFIC]
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DESIGN CONSIDERATIONS [TRAFFIC]
Class 1 (≤ 50 cars/day)
Driveways
Play areas
Parking lots (≤ 50
stalls)
Seasonal
recreation roads
Residential streets
Parking lots (> 50
stalls)
Class 2 (≤ 5 trucks/day)
Collector streets
Industrial lots,
truck stalls
Bus driveways &
loading zones
Class 3 (≤ 65 trucks/day)
Major arterial
streets
Local business
streets
Local industrial
streets
Major service
drives or
entrances
Class 4 (≤ 200 trucks/day)
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DESIGN CONSIDERATIONS [SUBGRADE]
Any structure is only as good as the foundation
upon which it is built.
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DESIGN CONSIDERATIONS [SUBGRADE]
Poor
Become soft and plastic
when wet.
Clays and fine silts
− ≥ 50% passing No. 200
Coarse silts and sandy
loams
− Deep frost penetration
− High water table
Typical Properties
CBR < 6
LL > 40
PI > 10
GI > 4
Medium
Retain a moderate degree
of firmness under adverse
moisture conditions.
Loams, silty sands, and
sandy-gravels containing
moderate amounts of
clays and fine silts.
Typical Properties
CBR: 6 – 9
LL: 25 – 40
PI: 6 – 10
GI: 2 – 4
Good
Retain a substantial
amount of their load-
supporting capacity when
wet.
Clean sands, sand-
gravels, and those free of
detrimental amounts of
plastic fines.
− ≤ 10% passing No. 200
Relatively unaffected by
moisture or frost.
Typical Properties
CBR ≥ 10
LL < 25
PI < 6
GI < 2
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DESIGN CONSIDERATIONS [DRAINAGE]
Three keys to pavement design:
– DRAINAGE, DRAINAGE, DRAINAGE
Surface drainage
– Safety
– Prevent water from entering pavement surface
Subsurface drainage
– Areas with high water table
– Areas where water accumulates in low areas
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DESIGN CONSIDERATIONS [DRAINAGE]
Drainage, Drainage, Drainage OK, it was a broken water main, but still a water issue.
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PAVEMENT MATERIALS
Asphalt Surface Course
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PAVEMENT MATERIALS
Asphalt Surface Course
0
½
1
1½
2
2½
3
Sin
gle
Lif
t T
hic
kn
ess, in
.
Surface Mix Type E D C B
Traffic
Class 4 Traffic Classes
1, 2, 3, & 4
Traffic
Classes 1 & 2
Finest Coarsest
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PAVEMENT MATERIALS
Asphalt Surface Course
Surface Type D Surface Type C Surface Type B
Finer Coarser
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THICKNESS DESIGN
We need to know:
– Traffic Class
– Subgrade Quality
Asphalt or aggregate base?
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SAMPLE DESIGN CHART [MEDIUM SUBGRADE]
0
2
4
6
8
10
12
0 2 4 6 8 10 12
To
tal A
sp
halt
Th
ick
ne
ss
(in
)
Aggregate Base Thickness (in)
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SAMPLE DESIGN CHART [MEDIUM SUBGRADE]
0
2
4
6
8
10
12
0 2 4 6 8 10 12
To
tal A
sp
halt
Th
ick
ne
ss
(in
)
Aggregate Base Thickness (in)
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THICKNESS DESIGN
Equivalence
– 1 in. of Asphalt Base ≈ 2–3 in. of Aggregate Base
Subgrade
Load
Asphalt
Aggregate Base
Subgrade
Asphalt
Load
Contact Stress (so) = Tire Pressure
so
si = Stress at
Subgrade
=
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THICKNESS DESIGN
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TACK COAT
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ASPHALT PLACEMENT
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ASPHALT COMPACTION
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FIX SC ROADS – CONTACT YOUR SENATOR!
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OVERLAY GUIDE OBJECTIVES
Users should know how to:
– Design a new pavement structure (from Part I).
– Evaluate pavement condition & existing structure.
– Determine why the overlay is needed.
– Determine the thickness of an asphalt overlay.
– Explain how asphalt overlays are constructed.
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ASPHALT OVERLAY DESIGN
OVERVIEW
Section 1
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CONTENTS OF THE OVERLAY GUIDE
Introduction
Design Considerations
Pavement Evaluation
Overlay Design
Overlay Construction
References
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TYPICAL ASPHALT PAVEMENT SECTION
Asphalt Base Course (Full-Depth Asphalt)
Aggregate Base Course
Subgrade
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DESIGN CONSIDERATIONS
Section 2
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DESIGN CONSIDERATIONS [TRAFFIC]
Class 1 (≤ 50 cars/day)
Driveways
Play areas
Parking lots (≤ 50
stalls)
Seasonal
recreation roads
Residential streets
Parking lots (> 50
stalls)
Class 2 (≤ 5 trucks/day)
Collector streets
Industrial lots,
truck stalls
Bus driveways &
loading zones
Class 3 (≤ 65 trucks/day)
Major arterial
streets
Local business
streets
Local industrial
streets
Major service
drives or
entrances
Class 4 (≤ 200 trucks/day)
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DESIGN CONSIDERATIONS [SUBGRADE]
Poor
Become soft and plastic
when wet.
Clays and fine silts
− ≥ 50% passing No. 200
Coarse silts and sandy
loams
− Deep frost penetration
− High water table
Typical Properties
CBR < 6
LL > 40
PI > 10
GI > 4
Medium
Retain a moderate degree
of firmness under adverse
moisture conditions.
Loams, silty sands, and
sandy-gravels containing
moderate amounts of
clays and fine silts.
Typical Properties
CBR: 6 – 9
LL: 25 – 40
PI: 6 – 10
GI: 2 – 4
Good
Retain a substantial
amount of their load-
supporting capacity when
wet.
Clean sands, sand-
gravels, and those free of
detrimental amounts of
plastic fines.
− ≤ 10% passing No. 200
Relatively unaffected by
moisture or frost.
Typical Properties
CBR ≥ 10
LL < 25
PI < 6
GI < 2
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EXISTING PAVEMENT CONDITION
Section 3
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EXISTING PAVEMENT EVALUATION
Condition assessment
– Visual evaluation
– Distress type, density, severity
– Good, fair, or poor condition
– Depth of cracking
Pavement Evaluation Guide
– Field manual
– Reference photos
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EXISTING PAVEMENT EVALUATION
Existing Pavement Structure
– Need to know the existing pavement structure
– Take cores or refer to construction history
– How deep are the cracks & are they top-down or full-
depth?
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OVERLAY DESIGN
Section 4
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OVERLAY THICKNESS DESIGN
We need to know:
– Traffic (Class 1, 2, 3, 4)
– Subgrade quality (Good, Medium, Poor)
– Existing pavement structure
– Condition of existing pavement structure
• Good
• Fair
• Poor Rehabilitation
Preservation
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OVERLAY THICKNESS DESIGN
Preservation
– Thinlay
– SCDOT Surface Type E
Rehabilitation and/or additional traffic
– Overlay
– SCDOT Surface Type C or D
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OVERLAY THICKNESS DESIGN
Overlay thickness based on:
– Effective structural value of existing pavement
• Based on existing pavement layers & subgrade
• Mill or not to mill?
• Adjusted based on pavement condition
– Required structural value
• Based on traffic
– Overlay Thickness Need = Required – Effective
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ASPHALT OVERLAY CONSTRUCTION
Section 5
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OVERLAY CONSTRUCTION
Will milling be done?
Tend to distresses
– Leveling course to fill ruts
– Crack seal
– Full depth patching & subgrade repair where needed
Surface preparation & tack coat
Proper placement & compaction practices
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WRAP-UP
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WRAP-UP
Design Considerations
Existing Pavement Condition
Overlay Thickness Design
Asphalt Overlay Construction
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THANK YOU!
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THANK YOU!