asphalt pavement life cycle design and maintenance · 2013-12-17 · asphalt paving association of...
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Transportation Conference
November 5, 2013
Asphalt Pavement – Life Cycle
Design and Maintenance
Bill Rosener
Executive Vice President
Asphalt Paving Association of Iowa
Asphalt Paving Association of Iowa
An association of Hot-Mix Asphalt producers,
asphalt cement suppliers, aggregate producers,
consulting engineers and industry retailers formed
to insure the highest quality of asphalt is produced
and placed in the State of Iowa. Established in
1955.
APAI Staff
Bill the Asphalt Man
•Flagger
•Laborer
•Raker
•Roller Operator
•Paver Operator
•Estimator
•Project Manager
•EVP of APAI
What we offer: Project Consultation
Design, Methods, Planning
Black Bag Lunches
Expert Advice
Website www.apai.net
Design Program I-Pave
LCCA Program I-Save
Social Media www.facebook.com/Asphaltiowa
Open Houses Attend and learn, or feature your project
Whatever you need…we can help!
Why Choose Asphalt?
ASPHALT FACTS
Over 94% of the Nation’s Highways are
surfaced with Asphalt
Asphalt is 100% Recyclable
Asphalt is America’s #1 Recycled Product
Asphalt can be placed as a Perpetual
Pavement
Smooth
Durable
Quiet
Fast Construction
Staged Construction
Sustainable!
Benefits of Asphalt Pavements
Today’s Presentation Overview
1. Asphalt Design
2. Asphalt Maintenance
3. Building a Perpetual Pavement
4. New LCCA Tool – I-SAVE
Build Confidence
Eliminate Asphalt Misconceptions:
Asphalt is temporary
Maintenance is more expensive for asphalt
Asphalt is hard to design and specify
Asphalt is more expensive on Life Cycle Cost Basis
Specify Asphalt with CONFIDENCE
Asphalt is temporary
–FALSE!
Current IDOT
Life Cycle Cost Analysis
40 Year Pavement Design
PCC 40 years NO maintenance
Asphalt 40 years w/ overlay at
year 20
IDOT Service Life
31 28
29 30
29 25
15 17 16
0
5
10
15
20
25
30
35
40
45
50
Low (<200) Medium (200-500) High (>500)
Se
rvic
e L
ife
, Y
ea
rs
Average Daily Truck Traffic
Rigid Flexible Composite
Information from IDOT Pavement Management System (PMS)
Build Confidence
Asphalt Design Design for Success
1. ESALs / Traffic Count
2. Aggregate Size
3. PG Binder grade
4. Thickness Design
5. Specifying HMA
HMA Equivalent Thickness Design: (Local Systems)
AASHTO Strength Coefficient & Proposed Modifications *
Pavement Type: Coefficient:
PCC .5
HMA (75%) (Type A Aggr.) .46*
HMA (60%) (Type A Aggr.) .44
HMA (45%) (Type B Aggr.) .42
HMA Cold-in-Placed Recycled .30*
Treated Asphalt Millings .25 - .35*
Crushed Stone Base .14
Example:
6” PCC .50 x 6 = SN 3.00
6” Stone Base No Value to PCC
6” HMA (60% Crushed) (Type A ) .44 x 6 = SN 2.44
6” Stone Base .14 x 6 = SN .84
SN 3.28
How do most engineers design?
We have traditionally designed to concrete
thicknesses or to levels of comfort from
experience
Introducing I-PAVE…
What does I-PAVE do?
AASHTO 1993 Pavement Design for New or Reconstructed Pavements
Flexible pavements
Rigid pavements
Life cycle cost analysis
Use FHWA procedures outlined in technical bulletin
Uses Bidx pricing from 12/11-12/12
Creates a summary of designs for easy printing
WWW.APAI.NET
Specify Asphalt with CONFIDENCE
Maintenance is more
expensive for asphalt-
FALSE!
IDOT Maintenance
$2,357
$6,571
$4,751 $4,003
$3,320
NA
$9,259
$5,716
$12,221
0
2000
4000
6000
8000
10000
12000
14000
Low (<200) Medium (200-500) High (>500)
Ma
inte
na
nc
e P
V, $
/la
ne
-mi
Average Daily Truck Traffic
Rigid Flexible Composite
Note: IDOT Right-of –Way Only
Asphalt Maintenance
Crack Sealing
Fog Sealing
Chip Sealing
Microsurfacing
Patching
Mill and Fill
Crack Sealing
Fog Sealing
Chip Sealing
Microsurfacing
Mill and Fill
Build Confidence
BUILD
PERPETUAL
PAVEMENTS
Flexible Rigid
Benefits of Perpetual Asphalt
Pavements
1. Fast to Construct
2. Staged Construction
3. Easy to Maintain and Repair
4. Never lose your curb line!
5. Smooth and Beautiful
Who uses Perpetual
Asphalt Streets?
City of Ames
City of Altoona
City of Des Moines
City of Council Bluffs
City of Mason City
City of Waverly
City of Cedar Rapids
City of Sioux City
Scott Schram Iowa DOT
Office of Construction and Materials
Important to select appropriate timing of activities
How sensitive is LCCA to time?
$0.00
$0.10
$0.20
$0.30
$0.40
$0.50
$0.60
$0.70
$0.80
$0.90
$1.00
$1.10
0 5 10 15 20 25
Pre
sent
Valu
e, $
Time, n
1/(1+r)n
~3 Years amounts to 10%
Important to select appropriate timing of activities
How sensitive is LCCA to time?
It only takes 3 years to differ by 10%
How do we determine Timing for paving alternatives?
1992 to current
Automated Condition Collection ◦ IRI
◦ Cracking
◦ Faulting
◦ Rutting
◦ Friction
◦ FWD/GPR
MAP-21 Advantages: Uniformly measured Considers the User Simple Available (requirement) Disadvantage: Neglects other failure modes
y = 69.82194784e0.04010643x
0
50
100
150
200
250
0 5 10 15 20 25 30 35
IRI in
/m
i
Age
y = 105.99123e0.02786x
0
50
100
150
200
250
300
350
400
0 5 10 15 20
IRI in
/m
i
Age
y = 67.71370442e0.04353128x
0
50
100
150
200
250
300
350
0 10 20 30 40
IRI in
/m
i
Age
y = 78.55844170e0.02238285x
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70
IRI in
/m
i
Age
NEW HMA
y = 120.83958665e0.00885331x
0
100
200
300
400
500
600
-20 0 20 40 60 80
IRI in
/m
i
Age
NEW PCC 1
y = 51.274e0.0285x
0
20
40
60
80
100
120
0 2 4 6 8 10 12 14
A threshold is needed to define terminal case
y = 120.83958665e0.00885331x
0
100
200
300
400
500
600
-20 0 20 40 60 80
IRI in
/m
i
Age
NEW PCC 1
Review records to determine longevity of paving strategies based on your own experience.
Documentation
IPMS – CTRE
You may send a request to CTRE to get data from your county
Introducing I-Save
LCCA Program
Thank yous and Credits
Dr Chris Williams, ISU
Dr. Scott Schram, IDOT
Ashley Buss, ISU
Max Grogg, FHWA
APAI Upcoming Events
APAI Annual Convention
Dec 4-5, 2013
WDM Marriott, WDM
County Engineers Convention
Dec 9-10, 2013
Scheman Building, Ames
Greater Iowa Asphalt Conference
Feb 26-27, 2013
Airport Holiday Inn, Des Moines
Thank you!
APAI
is at your service
515-233-0015
www.apai.net
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