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Expert Task Group on Asphalt Mixtures & Construction; Asphalt Binders; and Models Technology August 2001 Meeting Minutes

Minneapolis, Minnesota

ACTION ITEMS are indicated in bold.

NEXT MEETING is scheduled for February 12, starting at 1:00PM to February 14, 2003 concluding at Noon in the Washington, DC Area.

FOLLOWING MEETING is scheduled for September 16, starting at 1:00PM to September 18, 2003 concluding at Noon in a location to be determined.

The meeting was convened on August 28, 2002 by Chairman Jim Musselman of the Florida Department of Transportation (DOT). Those members attending were:

Jim Musselman, Florida DOT (Chair)
Tom Harman, FHWA (Acting-Secretary)   

Ron Sines, PJ Keading (Vice-Chair)
Jimmy Brumfield, Mississippi DOT
John Cheever, Aggregate Industries
Erv Dukatz, Mathy Construction
Kevin Hall, University of Arkansas
Adam Hand, Granite Const. Co.
Mike Anderson, Asphalt Institute
Wade McClay, Maine DOT
Julie Nodes, Arizona DOT

Gerry Huber, Heritage Research
Frank Fee, Citgo Asphalt
Lon S. Ingram, Kansas DOT
Todd Lynn, APAC Inc
Chuck Marek, Vulcan Materials Co.
Jay Winford, Louisiana Roads & Bridges
Richard Kim, NC State University
Judie Ryan, Wisconsin DOT
John D'Angelo, FHWA (liaison Binder ETG)
Ted Ferragut, TDC Partners (TRB support staff)
F. M. Harvey, Wyoming DOT (liaison AASHTO Subcommittee on Materials)
Haleem Tahir, AASHTO (liaison)

Those "friends of the ETG" attending were:

David Jahn, Martin Marietta
Gale Page, FL DOT
Bob Peterson, Asphalt Institute
Nabil Kamel, Petro-Canada
Ali Regimand, Instrotec Inc
Frank Dalton, Pine Instrument Co.
Tom Brovold, Test Quip
Ken Brown, Troxler Laboratories
Don Christensen, AAT
Bill Zerfas, MnDOT
Roger Olson, MnDOT
Mihai Marasteanu, U of Minnesota
Jim Higgins, Interlaken
Lee Gallivan, FHWA
Jack Weigel, Payne and Dolan
Michael Zupanick, Technologic Resources
Ray Bonaquest, AAT

Leslie McCarthy, FHWA
Tamara Murry, University of Arkansas
Eyad Masad, Washington State University
Paul Messersmith, APAC
Dave Savage, Pine Instrument Co.
Greg Schiess, FHWA
Mike Bienvenu, Troxler Laboratories
Pamela Turner, Asphalt Institute
David Bobee', Shell Global Solutions
John Garrity, MnDOT
Gaylon Baumgardner, Paragon Technical Solutions
Shogtuo Dai, MnDOT
Dan Prill, Interlaken
Allen Cooley, NCAT
Rebecca McDaniel, NCSC
Kevin Suitor, Citgo Asphalt

DAY 1:

Call to Order- Musselman (FDOT)
Chairman Jim Musselman welcomed the group and thanked the Minnesota DOT and University of Minnesota for hosting the meeting. He recognized the new members of the task group and reviewed the agenda (Attachment A), emphasizing the essential functions of the ETG.

Update on John Bukowski - Harman (FHWA)
As many of you are aware, John had a severe heart attack four months ago. His recovery has been slow; with much of his time spent in the intensive care unit (ICU). Recently John had a heart pump installed to assist his circulation. This procedure is a prelude to a heart transplant. John is looking at approximately two months of physical therapy in the hospital before he can return home. Then hopefully he will receive a new heart before the end of the year. John is awake and very alert and he is looking forward to returning to work as soon as possible. Please keep him and his family in your thoughts and payers.

Logistics - Sines (PJ Keading)
Vice-chairman Ron Sines reviewed the basic logistics regarding the meeting. The Vice-chair asked the attendees for self-introductions.

Review of ETG Action Items - Musselman
The Chairman recapped the action items from the February 2002 meeting (Attachment B).

ACTION: The Chairman requested the members provide any comments to the February 2002 meetings minutes by e-mail (to the Chairman) by September 30, 2002.

Report of Binder ETG Activities/Issues- D'Angelo (FHWA)
John D'Angelo (Secretary Binder ETG) provided a recap of Binder ETG activities (Attachment C). The following is a summary of ongoing goals and activities:

  • Developing a new approach for determining PG temperature requirements using "degree hours" using the NCHRP 1-37A models to evaluate damage. The current approach of a 7-day high pavement temperature does not fully capture binder performance. If implemented, this will require the use of higher high temperature grades across the United States.
  • Developing a new approach for short-term aging of binders - including investigation of the German rolling flask and a new approach being developed by Texas A&M.
  • Evaluating and developing new approaches to evaluate the high temperature performance of binders (rutting), including modifiers - developed under NCHRP 9-10. 9-10 proposed creep testing of binders using the dynamic shear rheometer (DSR). This is often referred to as zero shear viscosity (ZSV).
  • Evaluating and developing new approaches to evaluate the intermediate temperature performance of binder (fatigue cracking). One approach being investigated, developed by Dr. Richard Kim (NC State), uses the direct tension test and fracture mechanics to model performance.
  • Discussion of data derived from the direct tension indicates the types of modifiers employed by the suppliers.

Report on the Subcommittee on Materials (SOM) - Harvey (Wyoming DOT)
Rick Harvey updated the group on the SOM specification changes recommended by the ETG, specifically: MP2, PP28, and the dynamic angle validator (DAV). Ballots were returned in June 02 and discussed by SOM in August 2002. MP2/PP28 proposed changes included: removal of the restricted zone and addition of the 4.75 mm NMAS mix. Both purposed changes were well received and forwarded on to ballot. DAV included two actions: addition of DAV to T312 and a new 17 page standard for the operation of DAV. The DAV procedure went through with very little comments. The T312 additions had several negative comments regarding manufacturer required maintenance. This was removed. It will go out to ballot with maintenance as recommended by the manufacturer. The subcommittee wants the manufacturers to define what the recommended maintenance should be.

Provisional standards were also discussed - since many of the unique SHRP standards are not being used routinely by States, the question was raised, "should they be dropped?" Since Superpave Shear Tester (SST) (AASHTO TP7), Beam Fatigue (AASHTO TP8), and Indirect Tensile Test (IDT) (AASHTO TP9) are being used routinely by the research community (and supported by NCHRP), the SOM is proposing to ballot these standards as full this year. TP7 is in good condition based on a prior review by the ETG.

ACTION: Harvey requested that a Task Team be formed to review these procedures, specifically TP8. Proposed changes need to be to Harvey by February 2003. Dr. Richard Kim volunteered to head up this effort with the assistance of McDaniel (NCSC), Anderson (AI), Cooley (NCAT), Rowe (Abetec), and Myers (FHWA).

NCHRP 9-29 will be updating TP9. The rolling wheel compactor and resilient modulus standards will be archived this year. AASHTO TP2 (extraction of binder from mix) will be balloted to full standard. Issues regarding T209 (Rice) were also discussed, specifically regarding suggested data collection on future AMRL samples.

TRB Superpave Committee - Ferragut (TDC Partners)
Ted Ferragut briefed the group on the committee's activities (Attachments D & E). The committee has been responsible for over $17 million dollars of NCHRP support research to finalize the Superpave system.

Update of Selected NCHRP Projects - D'Angelo (FHWA) for Dr. Ed Harrigan (NCHRP)
John D'Angelo briefed the ETG on the status of selected NCHRP projects (Attachment F).

Status of Projects 90-07 - Harman (FHWA)
Tom Harman briefed the ETG on the status of NCHRP 90-07 and the associated pooled fund project (Attachment G). NCHRP 90-07, entitled, "Understanding the Performance of Modified Asphalt Binders in Mixes," is being conducted by the FHWA Office of Infrastructure, R&D and funded by NCHRP and pooled funds. The focus of this study is to conducted laboratory binder and mixture characterization to validate and assess proposed enhancements to the Superpave binder specification. The Modifiers included in the study were identified in cooperation with the TRB Binder ETG. 90-07 is building on a previous study conducted by FHWA entitled, "SHRP Binder Validation," where three un-modified and two modified materials were tested in the laboratory and under the FHWA Pavement Testing Facility (PTF). The new study incorporates nine new modifiers and two un-modified materials. Laboratory testing includes new protocols for the DRS (dynamic shear rheometer) and mixture performance testing including: proposed simple performance test, Superpave shear test (SST), French, and Hamburg. This summer the FHWA PTF accelerated load facility (ALF) test lanes are being reconstruction with these modifiers. Loading of the sections will begin in September 2002.

The FHWA continues to solicit State support for the pooled fund. Additional funding is required to complete the loading and analysis of the test sections. The products of this study will include:

  • Full-scale accelerated validation of the proposed changes to the Superpave binder specification;
  • Validation of the proposed simple performance test with polymer modifiers;
  • Full-scale validation of the proposed 2002 design guide models with polymer materials;
  • Assessment of the applicability of the 2002 design guide models to recycled materials; and
  • Evaluation of innovative testing equipment (Geo-gauge) to conventional methods (FWD).

Results and Discussion of NCHRP Project 9-16 - Anderson (Asphalt Institute)
Mike Anderson briefed the group on NCHRP 9-16 (Attachment H). NCHRP 9-16 recommended the use of N-SRmax as a screening test to identify gross mixture instability. N-SRmax is derived from compacting a specimen in a Superpave gyratory compactor equipped with shear measurement capabilities. Not all SGCs have the capability to measure shear. N-SRmax is the number of gyrations where the maximum shear resistance is measured. If the ratio of N-SRmax to Ndesign is greater than 0.95 the mix is consider "Good", 0.75 to 0.9 "Fair", and less than 0.75 "Poor". Anderson presented data showing that field rut depths correlated to the N-SRmax ratio. Data included test sections in Maryland, Wisconsin, WesTrack, and 13 GPS sites.

N-SRmax is limited in that it does not adequately identify binder stiffness and does not replace the need for a performance test. This limits its use during mix design to just evaluating aggregate structure. For QC/QA this could provide a rapid indicator of mix quality since it does not require air voids. A draft AASHTO procedure was developed under the project. This procedure will be reviewed by the ETG for consideration into any applicable specifications. Additional research needs include: continuing validation of the N-SRmax concept. Are the "Good" and "Poor" limits appropriate? Current data indicates some poor values came from mixes that provided adequate performance.

Tom Harman shared a new piece of equipment that is being developed by Tom Brovold (Test Quip), based on the work of Hussain Bahia (University of Wisconsin), (Attachment I). The pressure validation kit (PVK) uses three load cells to measure mixture response to compaction. Dr. Eyad Masad (Washington State University) shared work he has done with Dr. Bahia's device to quantify the measurements made.

Anderson discussed future research efforts needed for the implementation of the N-SRmax: sensitivity of N-SRmax to changes in mix components and applications of QC operations.

ACTION: Anderson will provide the ETG with the proposal, for possible recommendation to NCHRP.

TRB Circular on Bailey Method - Huber (Heritage Research)
Gerry Huber provided the group with an update on the proposed circular. The draft circular was submitted to Tim Aschenbrener (CO DOT), chairman of TRB committee A2D03. It is being reviewed for comment and possible publication. No further action is required by the ETG. (Attachment V)

NCHRP 9-26 Findings - D'Angelo
NCHRP 9-26 compared results from the CoreLok[TM] with those obtained from AASHTO T166. The 9-26 project is being conducted by the AASHTO Materials Reference Laboratory (AMRL). Round robin results show the actual T166 precision appeared to be much better than previously reported. The CoreLok appeared to be equal to the existing T166 precision. However, it was noted that the participants were new to the CoreLok procedure, most likely resulting in higher than expected variability. The project panel has directed AMRL to expand data-mining of existing round robin data to evaluate other test procedures' precision and bias statements. Discussion by the group expressed concern over the lack of training for participants prior to actual round robin testing. Alan Cooley (NCAT) provided examples where the procedure was not followed in the experiment.

ACTION: Tom Harman will request from Dr. Harrigan to have the SGC data shared with the ETG for review and comment.

Superpave Gyratory Mold Wear - Cooley (NCAT)
Alan Cooley discussed issues NCAT has had with gyratory molds (Attachment J). Concern was focused on the mold diameter, where the current tolerance for mold inner diameter (ID) is 149.9 to 150.0 mm. The original ruggedness study on the gyratory did not include mold wear. NCAT has observed mold erosion in the region where the mix is compacting. This is outside of where the mold ID is check. This problem was identified during an Alabama state-wide round robin of gyratory compactors conducted by NCAT. Cooley feels this is an issue, but is unsure what the extent of the problem is and what would be a proper tolerance. After additional discussion, the group felt that this is an issue warranting further investigation.

One factor leading to the mold wear on the NCAT compactor was a study NCAT conducted where dry aggregate was repeatedly compacted in the gyratory, which may have led to accelerated mold wear. However, it was noted that with time, this could become a more common problem.

ACTION: Frank Dalton (Pine Instruments) will provide the group with a report on the mold wear issue (Attachment U).

Simple Performance Test Bonaquest (Advanced Asphalt Technologies)
Dr. Ray Bonaquest updated the group on NCHRP 9-19 and 9-29 (Attachment K). NCHRP 9-19 recommended three test procedures for performance evaluation. NCHRP 9-29 is taking these protocols and: developing detailed purchase specifications, procuring two first article units, and evaluating the equipment. All of the tests are run in a tri-axial mode. The specimens required for these tests are 100 mm in diameter and 150 mm in height. These are derived from tall gyratory specimens that have been cored and sawed. The test pass/fail criteria will be based on the NCHRP 1-37A performance models. Dr. Bonaquest's team is currently evaluating the equipment per the purchase specifications. This project will not include low-temperature cracking.

DAY 2:

The Vice-chairman convened the meeting at 7:30 AM. Sines reminded the group of a previous ETG recommendation regarding aggregated issues as a lead-in to Mr. Jahn's presentation.

Fine Aggregate Angularity Issues - Jahn (Martin Marietta)
David Jahn shared with the group a brief summary of the White Paper drafted by the ETG Aggregate Task Force. Jahn then focused on the fine aggregate angularity, citing relatively poor correlation between the FAA and permanent deformation (rutting), (Attachment L). According to Jahn, the original SHRP data showed a break point of around 42.5 in extracted aggregate. The 45 value criteria was set based on the assumption that the fine aggregate experiences breakdown during production, thus reducing the as-produced FAA. Jahn stated that there is an overlap in FAA between natural and manufactured materials, where typically natural fines run from 38 to 43 and manufactured fines run from 42 to 48.

The International Center for Aggregate Research (ICAR) uses the Compacted Aggregate Resistance (CAR) test to assess internal friction of the fine aggregate. The CAR test is run in the Marshall Stability test frame, where a 1.5" diameter cylinder is pressed into fine aggregate compacted in a standard Marshall mold with 50 blows. Jahn feels this is a better discriminator for assessing materials. Some of his data indicated a good correlation between FAA and the CAR test. Jahn demonstrated cases where fine aggregate blends can "trick" the FAA into giving higher values. Jahn also cited the pooled fund 176 study, conducted by Purdue, which showed a mixture with an FAA of 44 out performing an FAA of 50. Lee Gallivan (FHWA) stated that was true for this study, but other factors influenced the results (including higher VMA in the 50 FAA mix).

Erv Dukatz pointed out that the measure of bulk specific gravity (Gmb) also has an impact on the variability of the FAA test. Jahn cited examples of economic impact on suppliers trying to meet the FAA requirements.

Jahn's recommendation was that 100% crushed fine aggregates be exempt from FAA requirements.

Discussion cited several examples of manufacturer processes that do NOT crush materials significantly. Based on this the group did not directly support Jahn's recommendation. Performance testing was also recommended as a means of accepting low FAA materials. Debate was also held regarding the CAR test versus the FAA. Currently only a few reports are available relating the CAR test to performance. Don Christensen (ATT) stated that internal friction can be calculated from the CAR test, which is a fundamental property. Chuck Marek (Vulcan) pointed out that at least 7 States are currently not using the FAA requirement in Superpave. In addition, the CAR test is currently not commercially available and the procedure is only in rough draft.

ACTION: Establish a task group to address this issue, headed up by Chuck Marek, including: Cheever, Dalton, Christensen, Jahn, Dukatz, and Cooley.

ACTION: Marek will provide the ETG with an update of the FAA White Paper.

QC/QA Proposed Standard Practice - Huber (Heritage Research)
Gerry Huber lead the discussion on the proposed QC/QA standard practice based on NCHRP 9-7 (Attachments M, N, & O). A major structural change is the relationship of QC and QA. In the 9-7 document QC is independent of QA. That philosophy is NOT part of the proposed document. 9-7 also did not include the concept of lots and sub-lots, which has been added. Huber continued, as outlined in the attachment, stating the differences between the proposed standard practice and the 9-7 report. After a lively discussion over content and definitions:

ACTION: The ETG needs to more closely review the proposed QC/QA Standard Practice and provide comments to Gerry Huber by September 30, 2002. Establish a task group to do a detailed review of comments: Hand, Ryan, Gallivan, Schiess, Brumfield, Myers, Fee, Lynn, Musselman, and Sines.

CoreLok - Cooley (NCAT)
Alan Cooley discussed an ongoing pooled-fund, round robin to evaluate the CoreLok device compared to AASHTO T166, (Attachment P). In this study, the variability of producing the samples affected the analysis. Training on the CoreLok appeared to be an issue. Since the round robin, the CoreLok procedure has been revised. For fine graded mixes the CoreLok compared well with T166. For coarse graded and SMA mixes compacted with high air voids, the CoreLok yielded lower densities, as expected. At about 0.4 percent water absorption, the two methods diverge for coarse/SMA gradations. Findings:

  • At high air voids, the CoreLok provides a better estimation of internal air voids.
  • CoreLok should be used when water absorption is greater than 0.4 %

The use of the CoreLok in mix design for a coarse/SMA mixture may increase design asphalt binder content by an approximately a 0.1, based on the data. Additional work in this area is being conducted by NCAT under NCHRP 9-27.

Research & Future Activities

Aggregate Imaging - Masad (Washington State University - WSU)
Eyad Masad discussed the image analysis system being developed at WSU, (Attachment Q). The system is call AIMS - Aggregate Imaging System. The intent of the project is to develop AIMS to directly measure the aggregate shape properties using a computer- automated system that is not based on commercial software. Most available systems focus on form and neglect fine aggregate. AIMS zooms in and out to meet the needs of the individual particles, allowing it to capture both coarse and fine particles at the same time. The cost for this system is approximately $28,000.

The initial work on this system, conducted under an NCHRP IDEA program, is to be completed next month. Additional work will be conducted in this area under NCHRP 4-30, whose problem statement was developed by the TRB Superpave Committee. The final report for 4-30 will be done by July 2004.

SGC-DAV Task Force - Hall (University of Arkansas)
Kevin Hall updated the group on the Task Force's activities, (Attachment R). Hall provided the background on the DAV device and demonstrated how the device is used. The Task Force was charged at the February 2002 meeting with three main action items:

  • Add note to T312 regarding importance of proper SGC maintenance, (Completed);
  • Prepare DAV procedure and rationale document, (Completed); and
  • Prepare guidance statement/document for DAV use.

ACTION: AASHTO SOM is requesting a detailed service manual from the manufacturers on the servicing of the devices, specifying the associated tolerances on the mechanical operation of the compactors. Identifying where the wear is and what specific areas need to be checked.

The changes in T312 will come out in the summer of 2003.

The next steps the task force is working on are: conducting a ruggedness evaluation of DAV and then a round robin study to establish precision and bias. The ruggedness study is ongoing. Of the 6 compactors being studied, 3 of the results are completed. 3 of the 6 factors studied have shown some significance, but none for of the factors are significant for all three compactors. Additional issues:

  • Implementation costs and strategies;
  • Mixture stiffness versus internal angle;
  • Mold wear;
  • Machine wear; and
  • Round-robin (inter-laboratory) study.

ACTION: The Task Force will develop a guidance statement on the use of DAV for review by the ETG and to be forwarded onto the State DOT's.

The Chairman pointed out that issues associated with mixture stiffness and the response of gyratory compactors exists regardless of the use of DAV. The Task Force is exploring the use of internal angle response as a function of specimen height as a possible indicator of mixture stiffness impact. The Task Force plans to meet during the annual TRB meeting in Washington, DC.

The ETG applauds the work of the Task Force, especially the contribution of APAC and Dr. Hall.

MinnRoad - Marasteanu (University of Minnesota)
Mihai Marasteanu shared the University of Minnesota's research on Low-Temperature Research, (Attachment S). Current research is focused on understanding mechanical behavior through material characterization. The University has a number of projects sponsored by the Minnesota DOT, including work with the complex modulus (E*). In the area of low-temperature research, they are pursuing a fracture mechanics approach using a semicircular-notched specimen. Dr. Marasteanu proposes the pursuit of a comprehensive laboratory study, which utilizes the MinnRoad facility to advance our understanding and modeling of low-temperature response. MinnRoad is currently considering reconstruction of several of the existing sections.

Research Needs- Ferragut (TDC Partners)
Ted Ferragut shared with the group a summary of the TRB Superpave Committee's 2005 vision, F-SHRP, and other ongoing research activities. The floor was then open to discussion for future research needs, (Attachment T).

Open Forum

The attendees provided areas for further discussion, research, and implementation:

  • Modification of the criteria for the coarse aggregate angularity (CAA) for high volume roads, (Marek).
  • Mixing and Compaction Temperature recommendations based off of viscosity (D'Angelo) - The Binder ETG is developing an NCHRP statement to address this issue. Interim recommendations will be developed over the next year.
  • Using the gyratory compactor to measure the constructability of mixes (Bahia).
  • Reevaluation of the Ninitial criteria (NC DOT). Ninitial criteria are forcing mixes below the restricted zone with reduced asphalt binder contents. Are we trading tenderness for durability? NC DOT is using Ninitial criteria as a production control.
  • Mold wear issue (Ingram).
  • Issues associated with the implementation of the DAV (Ingram, Brumfield).

The Chairman thanked all the guests, new members, members, Vice-chairman, and Acting Secretary for their support and input over the past two days.

Executive Session

The Chairman asked if any of the members have any bias or conflicts that would impact their role as a member in the expert task group. All of the attendees declared that they have no biases or conflicts.

The Chairman recapped the Action Items (Below).

The Chairman brought up a previous action item relating to Nmax.

  • Nmax requirement, provide recommendation to keep or delete along with rationale, prior to end of July, forward to all members, (Huber/West/ Anderson). Should this be kept? This item was tabled for now.

The Vice-chairman brought up the following previous action items:

  • Prepare a summary of Binder ETG concerns as related to mix stiffness for Mix/Agg ETG consideration, (D'Angelo).
  • Prepare a problem statement for a NCHRP synthesis study of various aggregate blending methods; send to ETG Chair prior to next meeting, (Huber). The ETG recommends dropping this previously proposed item.

Next generation of the gyratory compactor - Discussion
Brumfield introduced the topic and feels strongly that we need to design some other type of compactor to meet our current needs. The discussion focused on two primary areas:

  1. Developing a next generation gyratory that meets our current needs, such as: SPT specimens, NSR-max, DAV, and air void uniformity.
  2. Developing a future device that explores the role of compaction in the design and quality control process.

ACTION: Harman (lead), Kim, Hand, Huber, Anderson, Hall, Fee, Masad, and Bonaquist will develop these concepts further to be discussed at the next meeting.

The meeting was adjourned at 4:50 PM.

Action Items

  1. All presenters should forward an electronic copy of their presentation to the ETG Secretary by August 31, 2002.

  2. The Chairman requested the members provide any comments to the February 2002 meeting minutes by e-mail to him by September 30, 2002.

  3. Harvey requested a task group be formed to review AASHTO TP 7, 8, and 9. Any proposed changes need to be Rick by February 2003. Dr. Richard Kim (NC State) volunteered to head up this effort with the assistance of McDaniel (NCSC), Anderson (AI), Cooley (NCAT), Rowe (Abetec), Christensen (AAT), and Myers (FHWA). All proposed changes will need to be submitted by January 15, 2003 to Tom Harman. Harman will forward them to the membership and friends for review and discussion at the next meeting.

  4. Anderson will provide the NCHRP 9-16 unsolicited proposal to Tom Harman by September 1, 2002 to be forwarded to the ETG members, for possible recommendation by the ETG to NCHRP. The Vice-chairman will follow up with Dr. Harrigan regarding the ETG's role.

  5. Tom Harman will submit a request to Dr. Harrigan that the NCHRP 9-26 SGC data be shared with the ETG for their review and comments. Comments need to submitted back to Tom Harmon by September 30, 2002.

  6. Frank Dalton (Pine Instruments) will provide the ETG with a report on the mold wear issue for review and comment. The SGC-DAV task force will continue to look at this issue. (Attachment)

  7. A Task Team (headed up by Chuck Marek) was formed to further address the FAA/CAR issue. Members include: Cheever, Dalton, Christensen, Jahn, Dukatz, Winford, Sholar (FDOT), Nodes, and Cooley.

  8. Marek will provide the ETG with an update of the FAA White Paper by September 30, 2002.

  9. Marek will provide the ETG with a CAA White Paper by January 30, 2003.

  10. The ETG will review the QC/QA Proposed Standard Practice and provide comments to Gerry Huber by September 30, 2002. A Task Team Battalion consisting of Hand, Ryan, Gallivan, Schiess, Brumfield, Myers, Fee, Lynn, Musselman and Sines was formed to provide a detailed review of comments.

  11. The Chairman will contact Tim Aschenbrener (CO DOT) to determine what his needs are regarding the QC/QA Proposed Standard Practice. The Chairman will share this information with Gerry Huber and the QC/QA Task Team by September 15, 2002.

  12. AASHTO SOM is requesting a detailed service manual from the manufacturers on the servicing of the SGC devices, specifying the associated tolerances on the mechanical operation of the compactors, and identifying where the wear is and what specific areas need to be checked. The Chairman will send a letter with this request to the manufacturers by October 1, 2002.

  13. The SGC-DAV Task Force will develop a guidance statement, including the rationale and implementation issues, on the use of DAV for review by the ETG and to be forwarded onto the State DOT's by December 1, 2002.

  14. Attendees need to provide to Ferragut any additional Research Needs by September 30, 2002, with an electronic copy to Tom Harman.

  15. Prepare a summary of Binder ETG concerns as related to mix stiffness for Mix/Agg ETG consideration, (D'Angelo).

  16. Request AMRL provide the ETG with round robin data on AASHTO T209.

E-mail Addresses of those in attendance:

Members: Email addresses not available from this website

Friends: Email addresses not available from this website

E-mail Addresses of those not in attendance:

Members: Email addresses not available from this website

Old Friends: Email addresses not available from this website

List of Electronic Attachments:
(not available from this website)

  1. Mix-Agg ETG Agenda Aug 02.doc

  2. Mix ETG Action Items Feb 2002.doc

  3. DAngelo - Binder ETG Update- Aug 02.ppt

  4. Ferragut UPDATE Status Report - Aug 02.doc

  5. Ferragut Briefing on TRB Superpave Committee Issues.doc

  6. Harrigan - NCHRP Update Aug 02.ppt

  7. Harman - NCHRP 90-07- Aug 02.ppt

  8. Anderson - NCHRP 9-16- Aug 02.ppt

  9. Harman - Something New - Aug 02.ppt

  10. Cooley - SGC Mold Wear - Aug 02.ppt

  11. Bonaquist - SPT NCHRP 9-29 - Aug 02.ppt

  12. Jahn - FAA 29 Aug at ETG.ppt

  13. QC-QA 05-10-2002.doc

  14. QC-QA Discussion Paper 02.doc

  15. QCQA Discussion Paper Presentation.doc

  16. Cooley - Corelok - Aug 02.ppt

  17. Masad-AIMS -Aug 02.ppt

  18. KHall DAV Update - ETG Fall 2002.ppt

  19. mihai-mix-etg-08-02.pdf

  20. Research Brainstorming SessionVersion2.doc

  21. Pine LMRR200201 (REV A).PDF

  22. TRB Circular-Bailey Method -A2D Revised Final.pdf

PDF files can be viewed with the Acrobat® Reader®
Updated: 04/07/2011

United States Department of Transportation - Federal Highway Administration