• Dec 7, 2021: 2021 Virtual Accelerated Bridge Construction Conference: With Emphasis on International Experiences
    on December 7, 2021 at 2:00 pm

    2014, 2015, 2017 and 2019 Accelerated Bridge Construction (ABC) Conferences were held in Miami, Florida, during December of each year. Because of the COVID-19 pandemic and limitations, the 2021 ABC Conference will be held fully virtual, with emphasis on international ABC experiences. Select presentations by U.S. speakers will be made by invitation only to capture the most updated information in Accelerated Bridge Construction. The Call for Abstracts is aimed at identifying the presentations with an international scope. While the December 2021 conference will be held fully virtual, the U.S. and international speakers will have the option to travel to Miami, Florida and give their virtual presentations in Miami, in a setting that will meet all COVID-19 safety protocols. Participants will be attending the conference online. The 2021 virtual conference will be held Wednesday, December 8 through Friday, December 10. On each day, the conference will start at 9:00 a.m. and end at 3:00 p.m. U.S. Eastern Standard Time (EST, (UTC05:00)), to allow both U.S. and international audiences to attend the conference, while not being impacted greatly by time differences. The conference will also include U.S. and international keynote speakers. The conference program will be finalized by the Conference Planning Committee consisting of more than 30 U.S. state Department of Transportation engineers, each responsible for maintaining bridges in their state, and representatives of the U.S. Federal Highway Administration. The conference will include exhibitors, virtual social events, and virtual entertainment. Conference will include: Keynote talks- Please click here to view the updated list of keynote speakers and their titles. UHPC Workshop- Conference registration includes access to the Ultra High Performance Concrete (UHPC) workshop with presentations of detailed information on the development of non-proprietary UHPC at ABC-UTC and around the US. The workshop includes demonstration that allows attendees to see the UHPC mixing process. To obtain access to the UHPC workshop, you must indicate which session(s) of the UHPC workshop you will be attending. View on site | Email this event

  • Oct 29, 2021: Service Life Design Guidance for UHPC Link Slabs
    on October 29, 2021 at 5:00 pm

    Design for service life rather than just for strength against potential overload and fatigue failure is becoming a more common consideration for bridges. One aspect of design, and often bridge retrofit, with potential for a large impact is minimizing the number of transverse deck joints. Bridge deterioration can often be traced to poor performance of these deck joints due to failure of the joint seal allowing chloride laden water onto bridge girder ends, bearings, and substructure elements. Using link slabs over the piers allows for eliminating some interior joints and moving expansion joints to the end of the bridge while still maintaining typical bridge behavior. Link slabs allow the simply supported behavior expected for many bridges, yet still transmit deformations and forces to expansion joints and reduce potential penetrations in the bridge deck. Advanced materials, such as ultra-high performance concrete (UHPC) can simplify link slab details and substantially improve their durability. UHPC link slabs are specifically relevant to accelerating bridge retrofit in that the short required debonded lengths can significantly reduce the required amount of demolition and the overall time required for the project. Debonded lengths for UHPC link slabs can be as small as 16 in. compared to several feet for conventional construction. While the concrete in the immediate area of the joint may be deteriorated and can be removed quickly, concrete further from the joint will often be sound and take substantial time and labor to remove. The hairline distributed cracks that form in a UHPC link slab limit pathways for water to penetrate to the bridge girders and substructure, and UHPC itself is inherently more durable than conventional concrete due to its very low permeability. UHPC link slabs have been used successfully in the field by several state DOTs, several research studies have been carried out focused on link slabs, and appropriate design guidelines are available in the AASHTO LRFD Guide Specifications for Accelerated Bridge Construction (2018). However, more information is needed for quantifying the service life benefits of using UHPC link slabs compared to conventional construction. Question & Answer Period: Submit your questions when you register for the seminar and also in the question box during the seminar. (15 minutes) Certificate of Attendance: Each site registered for this seminar will receive an email for your response. Just click the first link in the email to obtain a certificate. For multiple participants at a site, the point-of-contact registrant for that site also clicks the second link in the email, logs in, and clicks “Attendees” to provide first name, last name, and email address for each participant at that site; each participant will then receive an automatic email with link to print an individual certificate. Accessing the second link in the email will also allow participants to print certificates for past seminars that were attended by simply clicking the seminar title. Please let Dr. David Garber at FIU know if you have questions or need assistance with receiving your certificate. David’s email address is dgarber@fiu.edu. For more information: Please contact us by sending an email to abc@fiu.edu. View on site | Email this event