Modified Binder (PG+) Specifications and Quality Control Criteria

Print
General Information
Study Number: TPF-5(302)
Lead Organization: Wisconsin Department of Transportation
Solicitation Number: 1360
Partners: CO, ID, KS, OH, WI
Status: Closed
Est. Completion Date:
Contract/Other Number:
Last Updated: Nov 05, 2018
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $350,000.00
100% SP&R Approval: Approved
Contact Information
Lead Study Contact(s): Lynn Hanus
lynnm.hanus@dot.wi.gov
Phone: 608-267-2294
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Colorado Department of Transportation 2015 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Colorado Department of Transportation 2016 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Colorado Department of Transportation 2017 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Idaho Department of Transportation 2014 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2015 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2016 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Kansas Department of Transportation 2014 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2015 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2016 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Ohio Department of Transportation 2014 $25,000.00 David Powers General Research 614-644-8135 Research@dot.state.oh.us
Ohio Department of Transportation 2016 $25,000.00 David Powers General Research 614-644-8135 Research@dot.state.oh.us
Wisconsin Department of Transportation 2014 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2015 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2017 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov

Study Description

There is no current consensus among state highway and transportation agencies as to the appropriate binder specification test methods required for adequate quality control and acceptance of modified binders. Supplemental tests have been adopted in addition to the conventional performance grade (PG) tests and are often referred to as “PG+” procedures. Many agencies have implemented these additional testing protocols; however, differences exist between the PG+ test methods, test conditions, and performance limits being specified. As a result, it is difficult to satisfy variable criteria when producing and supplying modified binders that consistently and uniformly meet agency expectations. The intent of this project is to provide essential information to state and local agencies to support standardization of PG+ specifications by identifying those PG+ test methods that are reproducible and show promise in simulating actual field performance.

From a practical perspective, formal ruggedness testing and statements of bias and repeatability do not exist for many procedure variants and PG+ specifications. A study of test method variability and reliability for promising PG+ tests identified in this project will help reduced binder testing disputes and associated costs during construction. Furthermore, it will help identify purchase specification test procedures that are unacceptable due to high variability and result in greater confidence in quality assurance testing and material compliance.

The Multiple Stress Creep and Recovery (MSCR) test is used to characterize the rutting resistance of both unmodified and modified binders. Recently specification limits were adopted by AASHTO in provisional method MP-19 as an eventual replacement for current SuperPave guidelines. This development represents a transition in binder grading protocols to test methods that are capable of evaluating the products currently in the market using properties better related to field performance. Conceptually, as a result of implementing the MSCR state agencies will be able to select binders based on properties better related to rutting resistance and with the desired level of elastic response. Rutting distress may not represent the critical mode of failure as many pavements fail due to cracking at intermediate and low temperatures. This concern is well recognized in current the current SuperPave grading system “PG+” specifications as numerous tests in both temperature regimes are required.

Recently, a number of test methods to improve evaluation of materials at intermediate and low temperatures were submitted to the AASHTO Subcommittee on Materials for consideration. Using these tests there is an opportunity to extend the motivating concepts of the MSCR, namely 1) a performance related test 2) capable of evaluating all binder types, to the intermediate and low temperature regimes. As a result, state agencies would have the ability to select materials based on parameters related to field performance across all service temperatures and levels of aging. However, to realize this objective significant efforts are needed in regards to deployment of the MSCR grading criteria and to assess the suitability of newly proposed test methods as agency specification tests for intermediate and low temperature binder properties.

Participation in this pooled fund presents an opportunity for specifying agencies and users to support research on development of specifications and acceptance criteria for modified binders with a focus on test methods that are most related to performance and meet specific needs. The product of this research is a unified modified binder specification developed in cooperation with partner states and User-Producer Groups delivered in a format that will allow for rapid implementation and deployment.

Objectives

Based on the stated needs and goals, the main objectives of the proposed pooled fund research include:

• Perform detailed assessment of current PG+ and modified binder quality control procedures in partnering states in terms of reliability, applicability, and relevance to performance and quality of modified asphalt binders.

• Use a range of modified binders, representative of the products currently specified by partner states, to develop unified test procedures and specification criteria based on products placed in the field.

• Improve product quality and reliability through conduct of ruggedness studies and development of precision and bias statements for selected tests.

• Introduce consistency to current products supplied by elimination or reduction of differences in modified binder acceptance tests and criteria throughout member states.

• Validate and establish relevance of suggested PG+ and quality control procedures in terms of mixture performance.

Relevant Experience of Research Team

The pavement material research group at the University of Wisconsin Madison and the Modified Asphalt Research Center (MARC) under the directorship of Professor Hussain Bahia has had extensive experience evaluating, improving, and developing asphalt binder characterization methods and test procedures. Such efforts notably include the NCHRP project 9-10 on design of asphalt mixtures using modified asphalt binders which led to the development of the repeated creep test which later became the basis for development of the Multiple Stress Creep and Recovery (MCSR) test.

Through the Asphalt Research consortium project (ARC) the team has been involved in evaluating and validating existing modified binder testing procedures and development of standards /specification criteria. The project involved collaboration with the Western Cooperative Test Group (WCTG), the Rocky Mountain Asphalt User-Produce Group (RMAUPG), state highway agencies and industry to improve PG+ specifications currently in use through documentation of benefits and costs associated with these tests, development of protocols for new binder tests, and development of specification criteria for new tests based on field evaluation of construction and performance. Additionally, interviews and surveys for soliciting feedback on binder tests and specifications were conducted among a large number of state highway agencies as part of this effort. As part of ARC, MARC has also been involved in validating newly developed asphalt binder procedures using comparison with field performance of Long-Term Pavement Performance (LTPP) and MnROAD test sections.

As part of MARC’s involvement in regional modified binder specifications, the group completed Phase 1 of the WisDOT project for development of “Modified Asphalt Binder Guidelines” and is currently the principal on a follow up study intended to identify test methods and specification limits based on field performance measurements from modified asphalt pavement sections constructed in the early 2000s across Wisconsin. 

Scope of Work

A. Analysis of Current Modified Asphalt Characterization Procedures (Year 1)

• Conduct detailed analyses on the most promising PG+tests. Identify PG+ tests that correlate to performance in laboratory mixtures and project sites.

• Recommend PG+ tests that best correlate to performance.

• Recommend specification limits that could be used on a regional or unified basis.

• Where necessary and appropriate suggest replacement methods and procedures for consideration.

B. Perform Statistical Analysis and Reliability Assessment on Selected PG+ Tests (Year 1)

• Conduct statistical analyses of binder test data for each binder sample as well as an annual analysis of variability.

• Final written report and recommendations for improving current PG+ testing protocols and introduce alternative test procedures where required. The report will also recommend specification limits that could be used on a unified basis.

C. Determination and Validation of Specification with Laboratory Mix Performance Data (Year 2)

• Laboratory mixture testing will be performed on loose mix samples to verify the predictive value of PG+ test in terms of primary distresses including, but not limited to rutting, fatigue, and low temperature cracking.

D. Validation using Field Performance Data (Year 2)

• Work with participating states to collect existing field data.

• Use uniform analysis procedure of collected field performance data for validation of proposed PG+ test methods.

• Create and populate a mixture and field performance database. The database will summarize results collected in Tasks A and B.

E. Develop Unified Modified Binder Characterization and Quality Control Specification (Year 2)

Comments

Partners are asked to commit a minimum of $25,000 per year. This pooled fund will last no longer than 36 months.

Future obligations will occur as needed to fund further activities set forth by the Technical Committee.

Documents Attached
Title File/Link Type Privacy Download
Final Report Phase 1 Phase 1 TPF-5(302)_FINAL.pdf Final Report Public
Final Report Phase 2 Pooled Fund Extension Final Report.pdf Final Report Public
Approve Waiver Memo Approval of SP&R Waiver Solicitation#1360.pdf Memorandum Public
Acceptance Memo TPF-5(302) Acceptance Memo.pdf Memorandum Public
Closeout memo TPF-5(302) Closeout Letter.pdf Memorandum Public
Closeout Funding Spreadsheet TPF-5(302) Closeout Funding Speadsheet.pdf Other Public
2014 Q4 Report PG Binder 2014Q4.pdf Quarterly Progress Report Public
2015 Q1 Report TPF-5 (302) Quarterly Report Form - 2015 Q1.pdf Quarterly Progress Report Public
2015 Q2 Report TPF Quarterly Report Form - 2015 Q2.pdf Quarterly Progress Report Public
2015 Q3 Report 2015 Q3 Report.pdf Quarterly Progress Report Public
2015 Q4 Report TPF Quarterly Report Form - 2015 Q4 FINAL.pdf Quarterly Progress Report Public
2016 Q1 Report 2016 Q1 Report.pdf Quarterly Progress Report Public
2016 Q2 Report TPF Quarterly Report Form - 2016 Q2 FINAL (002).pdf Quarterly Progress Report Public
2016 Q3 Report TPF Quarterly Report Form - 2016 Q3 (001).pdf Quarterly Progress Report Public
2017 Q1 Report TPF-5-302 Extension Quartely Progress Report- Q1-2017.pdf Quarterly Progress Report Public
2017 Q2 Report TPF-5-302 Extension Quartely Progress Report- Q2-2017-hb.pdf Quarterly Progress Report Public
2017 Q3 Report Q3-2017_final.pdf Quarterly Progress Report Public
2017 Q4 Report TPF-5-302 Extension Quartely Report-Q4-2017_final.pdf Quarterly Progress Report Public
Task Report Work Area 1 Pooled Fund Task Report -Work Area 1 (final).pdf Report Public
Task Report Work Area 2 Pooled Fund Task Report 2_FINAL_10.12.15.pdf Report Public
Task Report 2 Final Report Pooled Fund Task Report 2_FINAL_10.12.15.pdf Report Public
Evaluation of Intermediate Temperature PG and PG+ Test Methods for Fatigue and Durability of Asphalt Binders White paper 2- Int Temp Cracking of Asphalt Binder 14 July 16.pdf Report Public
Evaluation of Test Method Alternatives for Thermal Cracking Characterization of Asphalt Binders White Paper 3- Low Temp cracking Properties 14 July 06.pdf Report Public
Analysis of MSCR Parameters as Related to Specification Development and Performance White Paper 1- MSCR %R High Temp Performance and Elasticity (Update july 28).pdf Report Public

Modified Binder (PG+) Specifications and Quality Control Criteria

General Information
Study Number: TPF-5(302)
Lead Organization: Wisconsin Department of Transportation
Solicitation Number: 1360
Partners: CO, ID, KS, OH, WI
Status: Closed
Est. Completion Date:
Contract/Other Number:
Last Updated: Nov 05, 2018
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $350,000.00
100% SP&R Approval:
Contact Information
Lead Study Contact(s): Lynn Hanus
lynnm.hanus@dot.wi.gov
Phone: 608-267-2294
Commitments by Organizations
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Colorado Department of Transportation 2015 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Colorado Department of Transportation 2016 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Colorado Department of Transportation 2017 $25,000.00 Michael Stanford Aziz Khan aziz.khan@state.co.us
Idaho Department of Transportation 2014 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2015 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2016 $25,000.00 Mike Santi Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Kansas Department of Transportation 2014 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2015 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2016 $25,000.00 Blair Heptig David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Ohio Department of Transportation 2014 $25,000.00 David Powers General Research 614-644-8135 Research@dot.state.oh.us
Ohio Department of Transportation 2016 $25,000.00 David Powers General Research 614-644-8135 Research@dot.state.oh.us
Wisconsin Department of Transportation 2014 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2015 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2017 $25,000.00 Barry Paye Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov

Study Description

Study Description

There is no current consensus among state highway and transportation agencies as to the appropriate binder specification test methods required for adequate quality control and acceptance of modified binders. Supplemental tests have been adopted in addition to the conventional performance grade (PG) tests and are often referred to as “PG+” procedures. Many agencies have implemented these additional testing protocols; however, differences exist between the PG+ test methods, test conditions, and performance limits being specified. As a result, it is difficult to satisfy variable criteria when producing and supplying modified binders that consistently and uniformly meet agency expectations. The intent of this project is to provide essential information to state and local agencies to support standardization of PG+ specifications by identifying those PG+ test methods that are reproducible and show promise in simulating actual field performance.

From a practical perspective, formal ruggedness testing and statements of bias and repeatability do not exist for many procedure variants and PG+ specifications. A study of test method variability and reliability for promising PG+ tests identified in this project will help reduced binder testing disputes and associated costs during construction. Furthermore, it will help identify purchase specification test procedures that are unacceptable due to high variability and result in greater confidence in quality assurance testing and material compliance.

The Multiple Stress Creep and Recovery (MSCR) test is used to characterize the rutting resistance of both unmodified and modified binders. Recently specification limits were adopted by AASHTO in provisional method MP-19 as an eventual replacement for current SuperPave guidelines. This development represents a transition in binder grading protocols to test methods that are capable of evaluating the products currently in the market using properties better related to field performance. Conceptually, as a result of implementing the MSCR state agencies will be able to select binders based on properties better related to rutting resistance and with the desired level of elastic response. Rutting distress may not represent the critical mode of failure as many pavements fail due to cracking at intermediate and low temperatures. This concern is well recognized in current the current SuperPave grading system “PG+” specifications as numerous tests in both temperature regimes are required.

Recently, a number of test methods to improve evaluation of materials at intermediate and low temperatures were submitted to the AASHTO Subcommittee on Materials for consideration. Using these tests there is an opportunity to extend the motivating concepts of the MSCR, namely 1) a performance related test 2) capable of evaluating all binder types, to the intermediate and low temperature regimes. As a result, state agencies would have the ability to select materials based on parameters related to field performance across all service temperatures and levels of aging. However, to realize this objective significant efforts are needed in regards to deployment of the MSCR grading criteria and to assess the suitability of newly proposed test methods as agency specification tests for intermediate and low temperature binder properties.

Participation in this pooled fund presents an opportunity for specifying agencies and users to support research on development of specifications and acceptance criteria for modified binders with a focus on test methods that are most related to performance and meet specific needs. The product of this research is a unified modified binder specification developed in cooperation with partner states and User-Producer Groups delivered in a format that will allow for rapid implementation and deployment.

Objectives

Based on the stated needs and goals, the main objectives of the proposed pooled fund research include:

• Perform detailed assessment of current PG+ and modified binder quality control procedures in partnering states in terms of reliability, applicability, and relevance to performance and quality of modified asphalt binders.

• Use a range of modified binders, representative of the products currently specified by partner states, to develop unified test procedures and specification criteria based on products placed in the field.

• Improve product quality and reliability through conduct of ruggedness studies and development of precision and bias statements for selected tests.

• Introduce consistency to current products supplied by elimination or reduction of differences in modified binder acceptance tests and criteria throughout member states.

• Validate and establish relevance of suggested PG+ and quality control procedures in terms of mixture performance.

Relevant Experience of Research Team

The pavement material research group at the University of Wisconsin Madison and the Modified Asphalt Research Center (MARC) under the directorship of Professor Hussain Bahia has had extensive experience evaluating, improving, and developing asphalt binder characterization methods and test procedures. Such efforts notably include the NCHRP project 9-10 on design of asphalt mixtures using modified asphalt binders which led to the development of the repeated creep test which later became the basis for development of the Multiple Stress Creep and Recovery (MCSR) test.

Through the Asphalt Research consortium project (ARC) the team has been involved in evaluating and validating existing modified binder testing procedures and development of standards /specification criteria. The project involved collaboration with the Western Cooperative Test Group (WCTG), the Rocky Mountain Asphalt User-Produce Group (RMAUPG), state highway agencies and industry to improve PG+ specifications currently in use through documentation of benefits and costs associated with these tests, development of protocols for new binder tests, and development of specification criteria for new tests based on field evaluation of construction and performance. Additionally, interviews and surveys for soliciting feedback on binder tests and specifications were conducted among a large number of state highway agencies as part of this effort. As part of ARC, MARC has also been involved in validating newly developed asphalt binder procedures using comparison with field performance of Long-Term Pavement Performance (LTPP) and MnROAD test sections.

As part of MARC’s involvement in regional modified binder specifications, the group completed Phase 1 of the WisDOT project for development of “Modified Asphalt Binder Guidelines” and is currently the principal on a follow up study intended to identify test methods and specification limits based on field performance measurements from modified asphalt pavement sections constructed in the early 2000s across Wisconsin. 

Scope of Work

A. Analysis of Current Modified Asphalt Characterization Procedures (Year 1)

• Conduct detailed analyses on the most promising PG+tests. Identify PG+ tests that correlate to performance in laboratory mixtures and project sites.

• Recommend PG+ tests that best correlate to performance.

• Recommend specification limits that could be used on a regional or unified basis.

• Where necessary and appropriate suggest replacement methods and procedures for consideration.

B. Perform Statistical Analysis and Reliability Assessment on Selected PG+ Tests (Year 1)

• Conduct statistical analyses of binder test data for each binder sample as well as an annual analysis of variability.

• Final written report and recommendations for improving current PG+ testing protocols and introduce alternative test procedures where required. The report will also recommend specification limits that could be used on a unified basis.

C. Determination and Validation of Specification with Laboratory Mix Performance Data (Year 2)

• Laboratory mixture testing will be performed on loose mix samples to verify the predictive value of PG+ test in terms of primary distresses including, but not limited to rutting, fatigue, and low temperature cracking.

D. Validation using Field Performance Data (Year 2)

• Work with participating states to collect existing field data.

• Use uniform analysis procedure of collected field performance data for validation of proposed PG+ test methods.

• Create and populate a mixture and field performance database. The database will summarize results collected in Tasks A and B.

E. Develop Unified Modified Binder Characterization and Quality Control Specification (Year 2)

Comments

Partners are asked to commit a minimum of $25,000 per year. This pooled fund will last no longer than 36 months.

Future obligations will occur as needed to fund further activities set forth by the Technical Committee.

Title File/Link Type Private
Final Report Phase 1 Phase 1 TPF-5(302)_FINAL.pdf Final Report Public
Final Report Phase 2 Pooled Fund Extension Final Report.pdf Final Report Public
Approve Waiver Memo Approval of SP&R Waiver Solicitation#1360.pdf Memorandum Public
Acceptance Memo TPF-5(302) Acceptance Memo.pdf Memorandum Public
Closeout memo TPF-5(302) Closeout Letter.pdf Memorandum Public
Closeout Funding Spreadsheet TPF-5(302) Closeout Funding Speadsheet.pdf Other Public
2014 Q4 Report PG Binder 2014Q4.pdf Quarterly Progress Report Public
2015 Q1 Report TPF-5 (302) Quarterly Report Form - 2015 Q1.pdf Quarterly Progress Report Public
2015 Q2 Report TPF Quarterly Report Form - 2015 Q2.pdf Quarterly Progress Report Public
2015 Q3 Report 2015 Q3 Report.pdf Quarterly Progress Report Public
2015 Q4 Report TPF Quarterly Report Form - 2015 Q4 FINAL.pdf Quarterly Progress Report Public
2016 Q1 Report 2016 Q1 Report.pdf Quarterly Progress Report Public
2016 Q2 Report TPF Quarterly Report Form - 2016 Q2 FINAL (002).pdf Quarterly Progress Report Public
2016 Q3 Report TPF Quarterly Report Form - 2016 Q3 (001).pdf Quarterly Progress Report Public
2017 Q1 Report TPF-5-302 Extension Quartely Progress Report- Q1-2017.pdf Quarterly Progress Report Public
2017 Q2 Report TPF-5-302 Extension Quartely Progress Report- Q2-2017-hb.pdf Quarterly Progress Report Public
2017 Q3 Report Q3-2017_final.pdf Quarterly Progress Report Public
2017 Q4 Report TPF-5-302 Extension Quartely Report-Q4-2017_final.pdf Quarterly Progress Report Public
Task Report Work Area 1 Pooled Fund Task Report -Work Area 1 (final).pdf Report Public
Task Report Work Area 2 Pooled Fund Task Report 2_FINAL_10.12.15.pdf Report Public
Task Report 2 Final Report Pooled Fund Task Report 2_FINAL_10.12.15.pdf Report Public
Evaluation of Intermediate Temperature PG and PG+ Test Methods for Fatigue and Durability of Asphalt Binders White paper 2- Int Temp Cracking of Asphalt Binder 14 July 16.pdf Report Public
Evaluation of Test Method Alternatives for Thermal Cracking Characterization of Asphalt Binders White Paper 3- Low Temp cracking Properties 14 July 06.pdf Report Public
Analysis of MSCR Parameters as Related to Specification Development and Performance White Paper 1- MSCR %R High Temp Performance and Elasticity (Update july 28).pdf Report Public

Currently, Transportation Pooled Fund is not supported on mobile devices, please access this Web portal using a desktop or laptop computer.