Concrete Logic

JOIN THE ACADEMY!! FOR A LIMITED TIME, VISIT CONCRETESCHOOL.CO FOR YOUR FREE ACCESS!! CONCRETESCHOOL.COON THIS EPISODE OF THE CONCRETE LOGIC PODCASTShould we really design concrete infrastructure for 75 to 100 years?In this episode, Seth is joined by Dr. Jon Belkowitz to question one of civil engineering’s favorite ideas: the 100-year design life.Using Hoboken, New Jersey as the example, Seth and Jon talk about what happens when old infrastructure has to serve a city that no longer looks, moves, or functions the way it did when that infrastructure was built.The issue is not just whether the concrete lasts.The bigger question is whether the original decision still makes sense.Jon argues that the industry should stop designing only for age and start designing around use, performance, maintenance cycles, and accountability.Maybe a 20-year design life with zero maintenance is harder, and more honest, than a 100-year design life nobody is around to answer for.WHAT YOU’LL LEARN· Why Dr. Jon Belkowitz questions the 100-year design life· What Hoboken, New Jersey teaches us about old infrastructure· Why designing for time may not be the same as designing for use· The difference between design life and maintenance life· Why a 20-year, zero-maintenance target may be harder than a 100-year target· How infrastructure decisions made today can trap future generations· Why compressive strength is not enough to define concrete performance· How sensors, inspections, and data could change infrastructure maintenance· What pavement condition index means and why timing matters· Why Roman concrete is not always a fair comparison for modern infrastructure· Why Jon says we should design for decision cycles instead of ageCHAPTERS00:00 Introduction and support for the show 04:55 Rethinking 100-year design life 07:39 Why designing for time may be the wrong approach 09:57 Seth pushes back on whether we already design shorter than we admit 11:11 Hoboken as a case study 14:13 The 20-year, zero-maintenance idea 15:00 Performance, sensors, and maintenance systems 16:15 Pavement condition index and the cost of waiting 17:45 Why Roman concrete is not the right comparison 18:08 Bridge inspection and infrastructure careers 22:56 Building on top of old Hoboken infrastructure 26:14 Why predicting 100 years out is almost impossible 28:59 Final takeaways: design for decisions, not ageGUEST INFODr. Jon Belkowitz Intelligent ConcreteGuest link: https://www.concretelogicpodcast.com/guests/jon-belkowitz/CONCRETE LOGIC ACADEMYThe people who understand concrete are the people who get listened to.Not the loudest person in the meeting.Not the guy repeating what he heard ten years ago.Not the person blaming every problem on the latest material change.The person who understands the “why” behind the concrete usually has the most valuable voice in the room.That is what Concrete Logic Academy is built for.You get practical concrete education, PDH courses, and real-world lessons pulled from the same topics we cover on the Concrete Logic Podcast.Design life changes. Materials change. Specs change. Owners change their minds. Infrastructure ages.Your knowledge needs to keep up.Start learning here: https://www.concretelogicpodcast.com/concreteschoolSUPPORT THE PODCASTIf the Concrete Logic Podcast gives you value, send a little value back.You can support the show here: https://www.concretelogicpodcast.com/support/You can also support the show through our KUIU affiliate link: https://www.concretelogicpodcast.com/kuiuInterested in sponsoring the podcast or working with Concrete Logic Media?Email Seth: seth@concretelogicpodcast.comCREDITSProducers: Tom Cummings, Jodi Tandett and Concrete Logic MediaMusic by: Mike Dunton https://www.mdunton.com/WHERE TO FIND SETHConcrete Logic Podcast: https://www.concretelogicpodcast.com/YouTube: https://www.youtube.com/@concretelogicpodcastLinkedIn: https://www.linkedin.com/in/seth-tandett/Concrete Logic Academy: https://www.concretelogicacademy.com/Until next time, let’s keep it concrete. 

Most concrete looks the way it does for one simple reason.We keep designing around the forms we know how to build.In this episode, Seth sits down with Darren Baldwin, President of PIKUS, to break down the real difference between analog formwork and digital formwork—and why that distinction quietly limits what architects, engineers, and contractors think is even possible with concrete.This is not a hype-filled “3D printing is the future” conversation. It’s a practical discussion about where digital formwork actually works, where it absolutely doesn’t, and why architectural concrete—not structure—is where this technology earns its keep.  WHAT YOU’LL LEARN • What “analog vs. digital formwork” really means in construction terms • When digital formwork beats precast on cost, logistics, and constructability • How curves, grade changes, and non-repeatable geometry break traditional forms • Why lack of data (and testing) still blocks structural adoption • Why architects keep designing square stuff when they don’t have to  CHAPTERS 00:00 – Intro and how to support the Concrete Logic Podcast 02:30 – Analog vs. digital formwork explained 04:10 – Is this just 3D concrete printing? 05:40 – When digital formwork makes economic sense 07:10 – Grade changes, curves, and non-repeatable geometry 09:20 – Testing, engineering, and the structural data gap 14:40 – Remodels, access constraints, and why lightweight matters 16:05 – Leave-in-place printed formwork (and why it’s not the focus) 19:30 – Digital concrete + millwork integration 21:20 – How to reach Darren / PIKUS  GUEST INFO Darren Baldwin PIKUS https://www.concretelogicpodcast.com/guests/darren-baldwin/  INTELLIGENT CONCRETE Concrete not behaving the way it should? At Intelligent Concrete, Dr. Jon Belkowitz and his team combine lab-level testing with real-world field experience to get to the root of performance issues, not just the symptoms. If you want data you can trust and answers you can use, learn more at https://www.concretelogicpodcast.com/intelligent-concrete CONCRETE LOGIC ACADEMY Earn PDHs in the same straight-talk format as the podcast: https://www.concretelogicacademy.com SUPPORT THE PODCAST Support the show directly: https://www.concretelogicpodcast.com/donate KUIU helps support the podcast: https://www.concretelogicpodcast.com/kuiu Media, sponsorship, or content inquiries: seth@concretelogicpodcast.com CREDITS Producer: Jodi Tandett & Concrete Logic Media  Music by Mike Dunton: https://www.mdunton.com/ WHERE TO FIND SETHhttps://www.linkedin.com/in/seth-tandett/ https://www.youtube.com/@concretelogicpodcast https://www.concretelogicpodcast.com

Most people believe the chart on the screen — Dr. Jon explains why you shouldn’t. If you’ve ever sat in a conference session staring at a chart and wondering whether you’re seeing real data or a dressed-up story, this episode is for you. Dr. Jon Belkowitz breaks down how data in the concrete industry is often stretched, normalized, cherry-picked, or misleading — and how to spot it before making decisions that affect a structure’s performance. We get into why people present data, what questions you should ask before trusting it, what error bars mean, and when it’s time to ask tougher questions. This conversation also touches on motivations, funding sources, normalized datasets, Purdue-Pharma-style chart tricks, and why peer review still matters. What You’ll Learn Why is data really presented in this industry — truth, persuasion, or something in between? How charts can hide peaks or exaggerate trends What error bars actually mean and why they matter When to question normalized or percentage-based data Signs that a dataset should be tossed out completely How to read peer-reviewed papers quickly without wasting time Why checking funding sources matters Why asking questions doesn’t make you “anti” anything  Chapters 00:00 – Why We’re Talking About Data 01:00 – What Motivates People to Present Data 04:00 – The Role of Data in Confidence and Decision-Making 07:30 – Normalized Data and How It Can Mislead 12:00 – Purdue-Pharma-Style Chart Tricks 15:30 – What Error Bars Actually Tell You 21:00 – When to Question What You’re Being Shown 25:30 – Reading Research Papers Without Wasting Time 30:00 – Motivation, Funding, and Hidden Bias 34:00 – Final Thoughts Guest Info Name: Dr. Jon Belkowitz Company: Intelligent Concrete Email: jon@intelligent-concrete.com Website: www.intelligent-concrete.com Concrete Logic Academy Earn PDHs in the same straight-talk format as the podcast: https://www.concretelogicacademy.com Support the Podcast Support the show: https://www.concretelogicpodcast.com/donate KUIU helps support the podcast: https://www.concretelogicpodcast.com/kuiu Media, sponsorship, or content inquiries: seth@concretelogicpodcast.com Credits Producer: Douglas H. Clarke, Jodi Tandett & Concrete Logic Media Music by Mike Dunton: https://www.mdunton.com/ Where to Find Seth Seth Tandett — concrete nerd and host of the Concrete Logic Podcast. LinkedIn: https://www.linkedin.com/in/seth-tandett/ YouTube: https://www.youtube.com/@concretelogicpodcast Podcast Website: https://www.concretelogicpodcast.com 

Indiana just told the cement industry it won’t accept any blended cement with more than 10% limestone. That’s a first - and it’s not sitting well with the people who pushed Type IL cement in the first place. For the first time, a state DOT pushed back on Type IL cement—and the industry fired back. Indiana’s Department of Transportation says it’s protecting performance after bridge decks started scaling. The American Cement Association says the DOT’s new limits are unnecessary, confusing, and unscientific. So, who’s right—and what does it mean for the rest of the country’s concrete? What You’ll Learn  • Why INDOT limited Type IL limestone content to 10%  • The ACA’s objections — and what’s left unsaid  • How PCA’s 2021 carbon-neutrality roadmap and the federal Buy Clean program accelerated the switch to Type IL • Why the “one-to-one replacement” claim may have been oversold • How variable limestone content (≈7.6–12.4%) affects consistency and performance • Why admixtures and curing aren’t substitutes for good practice • What INDOT’s maintenance and inspection programs get right • Why other DOTs may follow Indiana’s lead next Chapters  00:00 – Introduction & ACA Briefing Overview  01:00 – INDOT’s 10% Limit and Industry Response  04:00 – How Type IL Cement Took Over the Market  07:30 – PCA Roadmap & Federal Buy Clean Pressure  10:30 – Complacency and the One-to-One Myth  14:00 – What Really Drove the 2021–2023 Flip  18:00 – Cement Chemistry and QC in the Field  22:00 – The Variability Problem: 7.6% vs 12.4% Limestone  26:30 – Are Admixtures and Curing the Real Culprits?  30:00 – INDOT’s Data-Driven Maintenance Approach  32:00 – Why Other States Are Watching Closely Guest Info  Dr. Jon Belkowitz – Chief Technical Officer, Intelligent Concrete  Email: jon@intelligent-concrete.com  Website: https://www.intelligent-concrete.comConcrete Logic Academy  Earn your PDHs the logical way.  Explore practical courses made for contractors, engineers, and producers.  Free trial: https://www.concretelogicacademy.comSupport the Podcast  Support the show and be listed as a Producer for life on the episode page:  https://www.concretelogicpodcast.com/supportMedia & Sponsorship Inquiries: seth@concretelogicpodcast.comPodcast Partners Intelligent Concrete  At Intelligent Concrete, we combine lab precision with field expertise to help you understand what your concrete is telling you. Our services include mix troubleshooting, forensic and petrographic testing, performance-based specification and admixture development, and training for engineers, contractors, and producers. Whether you’re chasing consistency, durability, or answers after a failure, Intelligent Concrete delivers the data and insight to solve problems and improve performance.  Learn more: https://www.concretelogicpodcast.com/intelligent-concreteKUIU (Affiliate Link) – https://www.concretelogicpodcast.com/kuiu15% off the first order. CreditsProduced by Jodi Tandett & Concrete Logic Media Music by Mike Dunton — https://www.mdunton.comConnectivity Host: Seth Tandett Concrete Visionary | Business Development at Baker Construction | Host of the #1 Concrete Podcast LinkedIn: https://www.linkedin.com/in/sethtandett/ YouTube: https://www.youtube.com/@concretelogicpodcast Website: https://www.concretelogicpodcast.comIf you learned something new, share this episode with your team and help more engineers and builders think logically about concrete. Until next time, let’s keep it concrete! Reference Links ACA Briefing: “Portland-Limestone Cement Limits in Indiana Department of Transportation Specifications” (October 2025 Update) — https://tinyurl.com/TypeILINDOT Recurring Special Provision 901-M-069 (Effective December 1, 2025): https://www.in.gov/dot/div/contracts/standards/rsp/sep25/900/901-M-069%20251201.pdfINDOT Testing Memos Referenced in ACA Briefing:  • 21-05 • 22-02 • 23-01 • 24-03 • 25-02 (Available at https://www.in.gov/indot/doing-business-with-indot/contractorsconstruction/division-of-materials-and-tests/current-testing-memos/) 

What happens when the concrete industry’s “wonder dust” meets its high-tech rival? In this episode of the Concrete Logic Podcast, host Seth Tandett brings back Dan McCoy and Dr. Jon Belkowitz to challenge everything we thought we knew about silica fume. From bridge deck overlays that crack like eggshells to the real CO₂ math no one wants to talk about, the guys separate hype from chemistry and ask the only question that matters: What are we really asking this concrete to do? What You’ll Learn • What is silica fume really — and how did it end up in our concrete? • How does colloidal silica change the way concrete performs in the field? • Why bridge deck overlays using silica fume often fail before their time. • How mix design mistakes turn silica fume into a “volatile” material. • Why colloidal silica can actually cost less than silica fume. • What’s the environmental truth behind “green” cement substitutes? • Why performance specifications—not recipes—should drive concrete design. • The one ASTM document every purchaser should actually read. Chapters 00:00 Introduction and Guest Introductions 01:36 Understanding Silica Fume 05:11 Colloidal Silica vs. Silica Fume 13:38 Practical Applications and Challenges 18:34 Cost Analysis and Environmental Impact 32:52 Exploring Concrete Associations and Data Sources 33:07 Understanding CO₂ Emissions in Concrete Materials 34:34 Debating Environmental Impact of Fly Ash 36:03 The Role of Coal in Concrete Production 38:23 Analyzing Silica Fume vs. Colloidal Silica 40:10 Cost and Benefits of Silica in Concrete 41:23 Challenges in Using Silica Fume 43:03 Evaluating Cost Structures of Concrete Materials 45:22 Understanding Concrete Specifications and Purchaser Requirements 46:56 Concluding Thoughts on Concrete Practices Guest Info Dan McCoy, P.E. — R.L. McCoy, Inc. Email: danmccoy@rlmccoy.net LinkedIn: https://www.linkedin.com/in/dan-mccoy-48507730/ Website: https://www.rlmccoy.com Dr. Jon Belkowitz, Ph.D., P.E. — Director of Research, Intelligent Concrete Email: jon.belkowitz@intelligent-concrete.com LinkedIn: https://www.linkedin.com/in/jon-belkowitz-phd-pe-53494719/ Website: https://intelligent-concrete.com Concrete Logic Academy Earn PDHs for courses built from real podcast episodes. Start learning at https://www.concretelogicacademy.com Support the Podcast Donate to keep Concrete Logic independent: https://www.concretelogicpodcast.com/support Shop KUIU gear through our affiliate link: https://www.concretelogicpodcast.com/kuiu For podcast media services or sponsorships: seth@concretelogicpodcast.com Podcast PartnersIntelligent Concrete At Intelligent Concrete, we combine lab precision with field expertise to help you understand what your concrete is telling you. Our services include mix troubleshooting, forensic and petrographic testing, performance-based specification and admixture development, and training for engineers, contractors, and producers. Whether you’re chasing consistency, durability, or answers after a failure, Intelligent Concrete delivers the data and insight to solve problems and improve performance. Learn more: https://www.concretelogicpodcast.com/intelligent-concrete Credits Producers: Jodi Tandett & Concrete Logic Media Music by Mike Dunton — https://www.mdunton.com Connectivity Host: Seth Tandett — Concrete Visionary & Host of The #1 Concrete Podcast LinkedIn: https://www.linkedin.com/in/sethtandett YouTube: https://www.youtube.com/@concretelogicpodcast Website: https://www.concretelogicpodcast.com Like, subscribe, comment, and share this episode to help more people think critically about concrete. Let's keep it concrete!