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