FHWA Resource Center
MID-ALANTIC STATES PRESTRESSED CONCRETE COMMITTEE FOR ECONOMIC
FEBRUARY 6, 2006
SHERATON NORFOLK WATERSIDE HOTEL
NORFOLK , VIRGINIA
1 . Introductions and Opening Remarks
Mr. Lou Triandafilou of the FHWA convened the meeting. The participants were welcomed and asked to give a self introduction. A copy of the current mailing list was circulated among the attendees and they were asked to verify the information and make necessary corrections .
- Approval of Minutes from August 30, 2005 Meeting
A motion was made and seconded to approve the minutes from the August 30, 2005 meeting. There was one name change incorporated into the minutes .
Hank Bonstedt could not attend. Mark Hoover made a presentation outlining the purpose of this new group. The group has created a new web site, which is still under development. There are six producers who are members, including Schuylkill Products, Bayshore Concrete Products, New Enterprise Stone & Lime, Precast Systems, Atlantic Metrocast and Jersey Precast. Members are encouraged to visit the site. The plan is to have all 162 PCEF bulb-tee sections and future PCEF meeting information available on the site.
Other items of interest about the group include the following:
The AASHTO version of ‘Quick Beam' is on site for free downloading.
They are sponsoring the MD Concrete Conference.
All producer members have a license to produce the precast diaphragms.
Members are required to maintain PCI plant certification.
They promote the PCI bridge design manual.
Hank is the Executive Director.
PCEF beams are the beams of choice for the producers (Penn DOT announced that they were allowing the use of the 8” web PCEF Bulb Tees).
The group plans to set up meetings with the states to discuss ways to promote the use of prestressed products. The Chairman requested notification of these meetings. New Jersey, Virginia, District of Columbia, Delaware and Pennsylvania DOTs are working with the group.
- Design Parameters and Standardization Subcommittee
Claude Napier gave an update on the subcommittee's progress on controlling end cracks. He will have a report at the next meeting. Claude plans to distribute a complete list of all the bulb tee sections with a guide and history of what has been done. This information will be put on a CD by April- May. Charles Pettie will assist in setting up the information. The subcommittee will meet in the spring and have a report for the next meeting.
Claude stated that VDOT has used the bulb-tee in a number of bridges in the past year and the square foot bridge costs were very competitive. He commented that the life- cycle cost of a bulb-tee compared to A588 weathering steel with no joints was basically the same. The bulb-tee is more economical compared to painted steel. VDOT commonly uses 8,000 psi. concrete in their bulb tees. This is a good match as the 8,000 psi. concrete is readily available and is not cost prohibitive. The designer should use the lowest release strength needed to help lower the fabrication cost. Overall, VDOT has seen that PCEF bulb-Ts have lowered prices statewide by $7-9/sf.
Attached to these minutes are copies of the diaphragm details approved at the last meeting.
- Presentation on Lightweight Concrete Benefits by Reid Castrodale, Carolina Stalite Company
Reid passed out a handout and some samples. These materials consist of structural lightweight aggregate manufactured with the application of heat to a base rock to create a chemical reaction which increases the volume and reduces the weight of the aggregate. The application of this lightweight aggregate will reduce the weight of conventional concrete from 140-150 pcf to 103-125 pcf. Cost premiums vary from $6-30 pcy.
Reid discussed the uses of lightweight concrete with design strengths varying from 2,500 to 10,000 psi, depending on the specific aggregate used. In addition to achieving lighter weight structures, other benefits include increased durability, ASR resistance and improved bond between the concrete paste and aggregate. GA DOT is designing its first lightweight deck on a long-span bridge.
A copy of Reid's presentation will be posted on the CABA website.
- Proposed FHWA Lithium Technology Implementation Program by Lou Triandafilou, FHWA Resource Center-Baltimore
Lou passed out a technical brief on ASR, and mentioned that the FHWA is heading up another congressionally mandated effort to develop a protocol for selecting ASR-affected structures for treatment and for selecting additives for mix designs to prevent ASR in new structures. Lithium treatments will continue to be studied.
States will be asked to provide candidate structures for the study. In April, the FHWA will be sponsoring a workshop that will address this problem.
Lou asked the states to describe their experience with this technology. VDOT used the lithium treatment on a bridge deck in Arlington, as part of the electrochemical chloride extraction process. DELDOT applied lithium nitrate to a bridge at a rate of 6 gallons per square foot. PennDOT is looking at the Kernville viaduct as a possible site for use.
- Spliced Girders, A Producer's Perspective
Chad Saunders of Bayshore Concrete Products made a presentation. He discussed the various PCEF shapes and the corresponding forming parameters. Chad discussed the methods used at the plant for the VDOT projects, the Rte 123 over Occoquan River and the Rte 33 project at West Point. He did not recommend extension plates in flanges for splicing, and noted that 6' wide top flanges were not likely to be used. They prefer 5' widths, while Schuylkill Products prefers 4'. He also noted that the BT 77 and BT 79 beams were more efficient sections than the Florida bulb-Tees.
A copy of an earlier version of Chad's presentation will also be posted on the CABA website.
- Presentation on Bridge Construction Projects using Performance-Related Specifications (PRS), by VDOT Representative
Claude Napier stated that VDOT had used a PRS on a Rte 11 project in Radford and a project in the NOVA District. The recommendation has been made to use PRS on two projects in each of the nine VDOT districts. Mr. Celik Ozyildirim of the VA Transportation Research Council will write a report covering experiences on these projects.
- Materials and Construction QC/QA Subcommittee
Paul Finnerty made a presentation and passed out a handout consisting of the following: an updated chart for minimum test frequency for concrete and aggregates; an outline of 15 elements to a sample plant quality control plan; and an updated testing matrix for self-consolidating concrete (copies attached). Bob Horwhat gave an update on subcommittee progress. The group has reached consensus on minimums to use in the test frequency table, and these will be rolled into a QC plan. The group will finalize the text for the 15-element QC plan by the spring. They are working on a draft specification that will be presented to the full PCEF as a ballot item at the next meeting. Upon approval, the document will be included as an appendix to the previously approved guide specification for prestressed concrete products.
The test matrix for SCC will require further refinement and consensus by the group, with plans to also fold it into the guide specification as an appendix. This was considered to be a longer-term effort.
Schuylkill Products plans to publish the research conducted by Lehigh University on strand bond in SCC mixes. PennDOT has initiated a 12-month pilot program allowing producers to use SCC in prestressed beams for 1 project in each district. FHWA has concurred with the program. VDOT has a pilot project underway with Bayshore Concrete Products.
Bob asked if there was something that the PCEF wanted his subcommittee to work on next. Possible issues to investigate were as follows: beam transportation, repair procedures, and erection procedures. Lou will share with Bob a repair procedures document that was developed by the PCI bridge committee.
A copy of the subcommittee's January meeting notes will be attached to these minutes.
Action Item: Subcommittee to develop ballot item for voting at next full PCEF meeting.
- Update on PCI Georgia/Carolinas Self-
Consolidating Concrete Workshop, by Lou Triandafilou, FHWA
Lou led a discussion on a workshop he attended in Charlotte, NC on November 30, 2005. Over 70 people from the 3-state area attended, with presentations given on research and specification implementation of self-consolidating concrete in each state. Handouts have been provided to the PCEF QC/QA subcommittee. Lou covered PCEF efforts to develop a common testing matrix. Follow-up action items from the group include: training to certify inspectors; uniformity of specifications between the states; annual meetings of the group.
- Update on Fall 2006 New Jersey HPC/SCC Workshop, by NJDOT Representative
Lou Triandafilou handed out a brochure (copy attached) for the workshop. NJDOT is trying to address concerns that local concrete industry still has about HPC, plus learn about SCC technology. Some PCEF member states will be speaking. The workshop will provide an opportunity to bring people together to discuss issues and exchange ideas.
- Other Issues -- All Attendees
Charles Pettie asked for an update on each state's progress in implementing LRFD:
VDOT is starting training in-house and consultant designers this year with full implementation expected in 2007.
PennDOT has used LRFD for the past 9 years, and is updating software to include 2004 AASHTO interims.
WV DOT has most designs done by consultants since 1998.
Maryland will have training by the University of MD, and are expecting to see LRFD on a design/build project
District of Columbia is in the planning stages of implementation.
DELDOT implemented in 1997, with training by Dr. Dennis Mertz; receive training every 2 years.
One question which was not covered at the meeting due to time restrictions was regarding the AASHTO LRFD and NCHRP Report 519 implications of the requirement for a 90-day minimum girder age when continuity is established. Reid Castrodale provided some background that we wanted to share with the PCEF.
Report 519 recommended to AASHTO provisions where time-dependent effects could be ignored in design if the girders were over 90 days old when continuity was established. Additional revisions were made to the provision last fall, and the item should be ready for ballot at this May's meeting.
The next meeting will be during the week of Aug. 28 in the Maryland SHA District 7 office in Frederick.
13 . Adjourn by 5:00 PM