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Episode 1: Modern Post-Tensioned Concrete Bridges

Join Tim Christle, Executive Vice President of the Post-Tensioning Institute, as he hosts Bob Sward, Vice President of Structural Technologies, LLC, in this episode of Strength in Concrete. Together, they take an in-depth look at the evolution of post-tensioned concrete bridges over the past 60+ years.

Discover the key benefits and applications of post-tensioned bridges, advancements in design and technology, and how modern methods have significantly enhanced durability, resilience, and sustainability. Bob and Tim also address common myths about the industry and provide insights into emerging technologies shaping the future of post-tensioning. 

Listen Now: YouTube | Spotify | Apple

Additional Resources: Not Applicable

Episode 2: PT Bridge Specifications and Certification

In this episode, Tim Christle, Executive Vice President of the Post-Tensioning Institute, interviews Greg Hunsicker, Deputy Director at the Concrete Bridge Engineering Institute at the University of Texas in Austin.

They discuss current post-tensioned concrete bridge specifications, the importance of state DOT adoption and AASHTO referencing, and the critical role of certification programs in ensuring quality and durability. Greg also highlights the new initiatives at the Concrete Bridge Engineering Institute and the value of hands-on training. Join us for an insightful conversation about the future of concrete bridges.

Listen Now: YouTube | Spotify | Apple

Additional Resources:

  2. M55.1-19: Specification for Grouting of PT Structures

Episode 3: PT Bridge Tendon Grouting Quality and Durability

Join Tim Christle, Executive Vice President of the Post-Tensioning Institute, as he welcomes Brian Merrill, Principal at Wiss, Janney, Elstner Associates, Inc., for an in-depth discussion on post-tensioned concrete bridges. Together, they explore key topics such as corrosion protection, grout materials, and grouting procedures. Drawing from Brian's extensive industry expertise—including his work with the Texas Department of Transportation and the PTI M-55 Grouting Committee—the conversation offers valuable insights into the field.

They also examine the evolution of specifications, advancements in technology, and the critical role of workmanship in ensuring the durability and resilience of post-tensioned bridges. This episode is a must-listen for industry professionals seeking expert knowledge and practical takeaways, as it highlights key advancements and advantages in the quality and durability found in post-tensioned concrete bridges.

Listen Now: YouTube | Spotify | Apple

Additional Resources:

  1. M55.1-19: Specification for Grouting of PT Structures
  2. PTI Multistrand and Grouted PT Certification
  3. ASBI Grouting Certification
  4. Kilduff, A.L., Moyer, K.L., McCool, G.E., Ahern, M.E., and Breen, J.E. “Corrosion Resistance Recommendations from Long-Term Exposure Testing of Post-Tensioning Systems (0-4562-5F).” Center for Transportation Research, The University of Texas at Austin, 2013, https://library.ctr.utexas.edu/ctr-publications/0-4562-5f.pdf. 88 pp.
  5. Schokker, A.J., West, J.S., Breen, J.E., and Kreger, M.E. "Research Report 1405-5: Interim Conclusions, Recommendations, and Design Guidelines for Durability of Post-Tensioned Bridge Substructures." Center for Transportation Research, Bureau of Engineering Research, The University of Texas at Austin, 1999, https://library.ctr.utexas.edu/ctr-publications/1405-5.pdf. 48 pp.

Episode 4: An Engineer’s Perspective on PT Bridges

Join Tim Christle, Executive Vice President of the Post-Tensioning Institute, as he welcomes Nick Amico, South Atlantic Major Bridge Lead at HDR, Inc., for an insightfuldiscussion on the world of post-tensioned concrete bridges. In this episode, they delve into Nick's extensive experience in bridge design, focusing on the aesthetic and structural advantages of post-tensioned concrete bridges.

 

The discussion covers key topics includingthe advantages of post-tensioning, the remarkable durability and flexibility of concrete, and case studies of notable projects such as the Marc Basnight Bridge. Additionally, the conversation touches on the evolution of post-tensioning technologies, with Nick offering valuable advice for aspiring engineers entering the field.

 

Listen Now: YouTube | Spotify | Apple - Coming Soon! 

Additional Resources:

  1. PCL Civil Constructors, Inc. (2019).  Marc Basnight Bridge: ASBI Bridge Award of Excellence 2019. American Segmental Bridge Institute.
  2. North Carolina Department of Transportation. (2019).  Marc Basnight Bridge: Oregon Inlet, NC. HDR, Inc.
  3. HDR, Inc. (2025). Post-Tensioning Assessment and Rehabilitation of the I-526 Wando River Bridge. South Carolina Department of Transportation.
  4. Amico, Nick. "Post-Tensioning Inspection and Rehabilitation of the I-526 Wando River Bridge." Presented at the PTI Convention, Virtual, 2021.

Episode 5: PTI/ASBI Collaboration on PT Concrete Bridges

Join Tim Christle, Executive Vice President of the Post-Tensioning Institute, as he sits down with Gregg Freeby, Executive Director of the American Segmental Bridge Institute (ASBI), for an engaging discussion on post-tensioned concrete bridges.

This episode explores the significant advantages of post-tensioned concrete bridges, the expanding mission of ASBI, and the essential role post-tensioning plays in modern bridge design and construction. Drawing from his extensive experience—from his time with the Texas Department of Transportation to his leadership at ASBI—Gregg offers valuable insights on durability, technological advancements, and the collaborative efforts driving the concrete bridge industry forward.

Listen Now: YouTube | Spotify | Apple - Coming in Soon! 

Additional Resources:

  1. American Segmental Bridge Institute (ASBI)
  2. ASBI Certified Grouting Certification Training Program
  3. ASBI Durability Survey of Segmental Concrete Bridges, 5 th Edition, 2022
  4. National Concrete Bridge Council (NCBC)
  5. U.S. Department of Transportation – Federal Highway Administration (DOT)
  6. PTI Certification: Level 1 & 2 Multistrand & Grouted PT Specialist or Inspector
  7. PTI M55.1-19: Specification for Grouting of PT Structures
  8. PTI/ASBI M50.3-19(24): Specification for Multistrand and Grouted Post-Tensioning
About Our Podcast
Strength in Concrete is a podcast hosted by the Post-Tensioning Institute (PTI) – the leading authority on post-tensioning and its applications. PTI brings you expert insights, in-depth discussions on emerging trends, and the latest advancements shaping the industry.

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