arkansas interstate rehabilitation program 2000 ― 2005 ... workshop... · presentation. the...

Workshop on PolyPhosphoric Acid

Modification of Asphalt Binder

Arkansas Interstate Rehabilitation Program

2000 ― 2005

Performance of the Modified Asphalt Binder

April 7 & 8, 2009

Minneapolis, Minnesota

Modified Asphalt Cement Usage in Arkansas

Westerman Engineering Associates

Disclaimer:

The Arkansas State Highway and Transportation

Department has neither endorsed nor authorized this

presentation. The comments and conclusions presented

in this presentation are those of the presentation

presenter, which may or may not agree with the

Arkansas State Highway and Transportation Department.

Jerry R. Westerman was employed by the Arkansas State Highway and

Transportation Department (AHTD) for thirty five & ½ years and was the

State Materials Engineer from July 1, 2002 until retiring on August 27, 2008.

Westerman Engineering AssociatesPPA Workshop; Minneapolis, Minnesota; April 7 & 8, 2009



Presentation Objective:

• Discuss Modified Asphalt Binder Usage in

Arkansas

• Discuss Arkansas Interstate Rehabilitation

Program

• Discuss Performance of Arkansas Interstate

Rehabilitation Program ACHM Pavements



1981 ― Polymer Modified Viscosity Graded Asphalt Binders

3% Polymer by weight of Asphalt Binder

SBR, SBS, or SB

• November 1995 - Implemented 100% Usage of Performance Graded

Asphalt Binders in All Asphalt Concrete Hot Mixes by Job

Special Provision

PG 64-22; PG 70-22; PG 76-22

PG 70-22 Depending on Crude Source Required Modification PG 76-22 Required Modification to Achieve Grade


History of Modified Asphalt Cement in Arkansas


• November 1995 ― 1st Superpave Project by Project Change Order

• June 1996 ― 1st Superpave Contract Project under Job Special

Provision

• December 1997 ― 50 Superpave Projects under Contract

• January 1998 ― 100% Superpave Implementation under Supplemental

Specification

ACHM Designs (Nmax): 115; 160; 205

Asphalt Binder Grades:

PG 64-22 (PG 67-22); PG 70-22; PG 76-22

• Nmax matched to Asphalt Binder Grade

115 (PG 64-22)

160 (PG 70-22)

205 (PG 76-22)


Arkansas Interstates


A Reason for the Need of tneInterstate Rehabilitation Program



The Plan

• Rubblize and Overlay 276 Miles Bad Performing

Interstate Highway with Polymer Modified

Asphalt Concrete Hot Mix

• Mill and Inlay 64 Miles of Old Interstate ACHM

Pavement with Polymer Modified Asphalt

Concrete Hot Mix

• Reconstruct 40 Miles of PCCP from the Subgrade

UP• Complete within 5 Years

Interstate Rehabilitation Program


Minneapolis, Minnesota

April 7 & 8, 2009

• Interstate Rehabilitation Program Concurrent But Separate Program

from Regular Construction Program

• Interstate Rehabilitation Program Projects Were Let to Contract

under Supplemental Specifications Which Were Later

Incorporated in the Standard Specifications Edition 2003

• June 2000 ― 1st IRP Project Work Order Issued

• April 2005 ― Next to Last IRP Project and Last Asphalt Project

Accepted

Arkansas Interstate Rehabilitation Program: 2000 ― 2005

Westerman Engineering AssociatesWesterman Engineering AssociatesPPA Workshop; Minneapolis, Minnesota; April 7 & 8, 2009

Separate Program from

Regular Construction Program

Arkansas Interstate Rehabilitation Program


Route No.

Project

Miles

I 30 16 73.4

I 40 27 232.07

I 55 6 47.15

I 540 1 6.71

• $575M from the Sell of GARVEE Bonds Resulted in

$950M of IRP Construction

Average Interstate Rehabilitation Program Project Miles under

Construction




AHTD

SPECIFICATIONS


• Arkansas Highway & Transportation Department Standard Specifications: www.arkansashighways.com/Contract/progcon/general/STDSPEC_2003.HTM

• Arkansas Highway & Transportation Department Supplemental Specifications:

www.arkansashighways.com/Contract/ProgCon/General/SUPPSPEC.HTM

• Asphalt Concrete Hot Mix Standard Specification Divisions 400: Sections 404; 405; 406; 407; 409; 410

Section 404 ― Design and Quality Control of Asphalt Mixtures

Section 405 ― Asphalt Concrete Hot Mix Base Course

Section 406 ― Asphalt Concrete Hot Mix Binder Course

Section 407 ― Asphalt Concrete Hot Mix Surface Course

Section 409 ― Materials and Equipment for Asphalt Concrete Plant Mix Courses

Section 410 ― Construction Requirements and Acceptance for Asphalt Concrete Plant Mix Courses




AHTD Standard Specification For Modified Asphalt Binder

• 404.01(b) … Asphalt binder shall comply with the

requirements of AASHTO M 320 Table 1, except the

Direct Tension requirements are deleted, and shall be

from sources that have executed a certification

agreement with the Department. PG 70-22 and PG 76-22

asphalt binders shall be production straight run binders

that are modified by using either a SB, SBS or SBR to

achieve the specified grade. ….




• March 16, 2009 ― Learned That PolyPhosphoric

Acid Used in Production of Significant Quantiy of

PG 76-22 in Arkansas’ Interstate Rehabilitation

Program ACHM




• Mix Designs Performed by the Contractor or

Independent Laboratory

• AHTD Verifies AB Content

• AHTD Performs Rutting Potential of Laboratory Sample

at Design Asphalt Binder Content with APA

• If Mix Design Is within Specification Limit, Mix Design Is

Allowed to Be Used on Project


Rubblized Typical Tangent Section of

Asphalt Concrete Hot Mix Interstate

Rehabilitated Asphalt Sections


Pavement Cross Section of IRP Typical Tangent Section


• 4” PMACHM Surface Course ( 12.5 mm)

Placed in two lifts

• 3” PMACHM Binder Course (25 mm)

• 4.75” PMACHM Base Course (37.5 mm)

• 9” – 10” Rubblized PCCP



• ACHMSC(12.5mm) ― 2,462,075 tons of hot mix

132,952(1) Tons PG 76-22

• ACHMBC(25mm) ― 1,891,117 tons of hot mix

85,100(2) Tons PG 76-22

• ACHMBC(37.5mm) ― 3,074,024 tons of hot mix

126,035(3) Tons PG 76-22

• The Three Tonnages above Are in Addition to the

Routine ACHM Pavement Construction

(1) Based upon on average AB Copntent of 5.4%(2) Based upon on average AB Copntent of 4.5%(3) Based upon on average AB Copntent of 4.1%


Arkansas Interstate Pavement Types: Pre IRP & Post IRP


1999 2006

74% PCCP 36%

26% ACHM 64%


The Interstate Rehabilitation Program

Has Changed People’s Perception of

Arkansas Interstates


Performance?


1994 19992006

POOR – IRI ≥ 170 (in/mi)

FAIR – 120 > IRI ≥ 95 (in/mi)

GOOD – IRI < 95 (in/mi)

Interstate Condition Rating Per IRI

Interstate Condition - 2006



AHTD Projected 2016 Pavement

Condition Rating If Interstate

Pavements Are Left As Is

Pavement Distress To-date


• Delamination and Cracking of a Section of Pavement

• Isolated Spots of Asphalt Flushing

• Isolated Rutting on Inside Lane of One Project

• Isolated Pavement Ripples on Inside Lane of One

Project


• A Portion of the Asphalt Binder Contained

PolyPhosphoric Acid.

• In My Opinion The Arkansas State Highway and

Transportation Department Interstate Rehabilitation

Program Modified Asphalt Binders and the Finished ACHM

Pavements Constructed Are Performing As Intended and in

A Satisfactory Manner..

• The PolyPhosphoric Acid Appears to Have Performed Its

Function in the Asphalt Binder Modification Process andACHM Performance.

Are the Arkansas Interstate Rehabiltation

Program Polymer Modified ACHM Pavements

Performing at an Exceptable Level?



QUESTIONS



END

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