Optimum AC Overlay thickness for FDR of Existing AC Pavements

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General Information
Solicitation Number: 1449
Status: Solicitation withdrawn
Date Posted: Jun 22, 2017
Last Updated: Apr 25, 2018
Solicitation Expires:
Partners: KS
Lead Organization: Kansas Department of Transportation
Financial Summary
Commitment Start Year: 2017
Commitment End Year: 2021
100% SP&R Approval: Approved
Commitments Required: $389,109.00
Commitments Received: $97,500.00
Contact Information
Lead Study Contact(s): David Behzadpour
David.Behzadpour@ks.gov
FHWA Technical Liaison(s): Matthew Corrigan
Matthew.Corrigan@dot.gov
Phone: 202-366-1549
Study Champion(s): Greg Schieber
greg.schieber@ksdot.org
Phone: 785-291-3864
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Kansas Department of Transportation 2018 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2019 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2020 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov

Background

Most states are looking for optimum rehabilitation strategies of pavements in terms of cost and service life. Kansas is no exception. Thus a rehabilitation strategy of AC pavements that uses a stabilized base should result in thinner AC layers and satisfactory performance life. However, such a strategy that will fully reclaim the existing AC pavements in-situ (with some soil materials in it) with the help of a stabilizer consisting of Portland cement and fly ash has not been studied mechanistically. This study will fill the gap in the knowledge and develop practical mix designs for the stabilized layer and AC layer thickness for optimum performance at a reasonable cost.

Objectives

(1) To find out the optimum cement and fly ash content for full depth reclamation (FDR) of existing asphalt concrete (AC) pavements

(2) to mechanistically design AC overlays of a stabilized FDR base found in (1)

(3) construct and evaluate thin AC overlays on FDR base to find optimum thickness.

Scope of Work

The study will consist of two parts – (i) Laboratory Experimentation, and (ii) Full-Scale Accelerated Pavement Testing (APT).

Laboratory Experimentation: In the first part, with AC millings from typical lower volume AC pavements and maximum 2% soil (A-7-6 and A-4), optimum mixture designs will be developed for a stabilized base using Portland cement and Class C fly ash. Cement and fly ash contents will be varied to achieve a minimum 7-day unconfined compressive strength of 250 psi and 400 psi. The freeze-thaw durability of the stabilized mixtures will be evaluated following AASHTO T136. Also the shrinkage characteristics of the stabilized mixtures will also be evaluated. Moisture-density relationships per AASHTO T99/134 will be developed. Finally MEPDG analysis of AC pavements with the stabilized base from FDR with varying AC overlay thickness will be done to find the optimum AC overlay thickness.

Full-Scale Accelerated Pavement Testing (APT): For APT, three pavements with six test sections will be constructed for this experiment:

From the results, a design catalog will be developed for the design of AC overlays on FDR to provide pavement design engineers with more guidance in designing and specifying this rehabilitation strategy.

Comments

100% SPR Funding has been requested

Documents Attached
Title File/Link Type Privacy Download
Waiver Request Letter #1449 Waiver Request Letter.pdf Memorandum Public
Solicitation #1449 Waiver Approval Letter Approval of SP&R Waiver Pooled Fund Solicitation #1449.pdf Memorandum Public
Request for Proposals FDR Pooled Fund.docx Request for Proposals Public
Work Plan Work Plan Public

Optimum AC Overlay thickness for FDR of Existing AC Pavements

General Information
Solicitation Number: 1449
Status: Solicitation withdrawn
Date Posted: Jun 22, 2017
Last Updated: Apr 25, 2018
Solicitation Expires:
Partners: KS
Lead Organization: Kansas Department of Transportation
Financial Summary
Commitment Start Year: 2017
Commitment End Year: 2021
100% SP&R Approval: Approved
Commitments Required: $389,109.00
Commitments Received: $97,500.00
Contact Information
Lead Study Contact(s): David Behzadpour
David.Behzadpour@ks.gov
FHWA Technical Liaison(s): Matthew Corrigan
Matthew.Corrigan@dot.gov
Phone: 202-366-1549
Commitments by Organizations
Agency Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Kansas Department of Transportation 2018 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2019 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2020 $32,500.00 Greg Schieber David Behzadpour 785-291-3847 David.Behzadpour@ks.gov

Background

Most states are looking for optimum rehabilitation strategies of pavements in terms of cost and service life. Kansas is no exception. Thus a rehabilitation strategy of AC pavements that uses a stabilized base should result in thinner AC layers and satisfactory performance life. However, such a strategy that will fully reclaim the existing AC pavements in-situ (with some soil materials in it) with the help of a stabilizer consisting of Portland cement and fly ash has not been studied mechanistically. This study will fill the gap in the knowledge and develop practical mix designs for the stabilized layer and AC layer thickness for optimum performance at a reasonable cost.

Objectives

(1) To find out the optimum cement and fly ash content for full depth reclamation (FDR) of existing asphalt concrete (AC) pavements

(2) to mechanistically design AC overlays of a stabilized FDR base found in (1)

(3) construct and evaluate thin AC overlays on FDR base to find optimum thickness.

Scope of Work

The study will consist of two parts – (i) Laboratory Experimentation, and (ii) Full-Scale Accelerated Pavement Testing (APT).

Laboratory Experimentation: In the first part, with AC millings from typical lower volume AC pavements and maximum 2% soil (A-7-6 and A-4), optimum mixture designs will be developed for a stabilized base using Portland cement and Class C fly ash. Cement and fly ash contents will be varied to achieve a minimum 7-day unconfined compressive strength of 250 psi and 400 psi. The freeze-thaw durability of the stabilized mixtures will be evaluated following AASHTO T136. Also the shrinkage characteristics of the stabilized mixtures will also be evaluated. Moisture-density relationships per AASHTO T99/134 will be developed. Finally MEPDG analysis of AC pavements with the stabilized base from FDR with varying AC overlay thickness will be done to find the optimum AC overlay thickness.

Full-Scale Accelerated Pavement Testing (APT): For APT, three pavements with six test sections will be constructed for this experiment:

From the results, a design catalog will be developed for the design of AC overlays on FDR to provide pavement design engineers with more guidance in designing and specifying this rehabilitation strategy.

Comments

100% SPR Funding has been requested

Title Type Private
Waiver Request Letter Memorandum N
Solicitation #1449 Waiver Approval Letter Memorandum N
Request for Proposals Request for Proposals N
Work Plan Work Plan N

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