Concrete Logic

PRESENTED BY: GPRS Construction professionals know that utilities and concrete reinforcements can cause big problems when you’re on the job. GPRS helps you avoid them. We use ground penetrating radar to detect rebar, conduit, and post tension cables before you cut, core, or drill. And our concrete scans are 99.8% accurate… we guarantee it—helping you reduce hits, downtime, expenses, and keep your people safe. To keep your jobsite safer, visit https://www.concretelogicpodcast.com/GPRS SUMMARYIf you’ve never built your own concrete mix design… this episode fixes that.Dr. Jon Belkowitz walks through the ACI 211 method step-by-step, showing exactly how a mix is built from scratch.By the end, you’ll see that mix design isn’t magic.It’s just decisions… and a little math.WHAT YOU’LL LEARNWhat actually goes into a cubic yard of concrete — and why it mattersWhy mix design is basically a “choose your own adventure”How slump, aggregate size, and air content drive your entire mixThe simple math behind water-cement ratio (and why it controls everything)How to calculate cement, water, rock, and sand — step by stepWhy yield matters (and how getting it wrong costs real money)The difference between a design mix vs batch mixWhat changes when moisture shows up in your aggregates (this comes up near the end) CHAPTERS00:00 – Intro and how to support the show 02:20 – Shoutout to this episode’s Producer 03:00 – Why PDHs should actually be useful 05:20 – What is a cubic yard of concrete? 06:30 – Absolute volume method explained 09:50 – ACI 211 and “choose your own adventure” 13:30 – Selecting slump, water, and air content 17:00 – Adjusting water for admixtures 19:00 – Water-cement ratio and strength 21:00 – Aggregate proportions and why they matter 25:30 – Start of the actual math 31:30 – Calculating coarse aggregate 34:00 – Converting weights to volumes 36:30 – Solving for sand (the missing piece) 39:30 – Final mix design breakdown 40:10 – Design mix vs batch mix (what’s next) GUEST INFODr. Jon Belkowitz Intelligent Concrete Website: https://www.concretelogicpodcast.com/intelligent-concreteCONCRETE LOGIC ACADEMYGot a concrete problem no one can explain?Bring it to the Concrete Logic Academy.Ask questions. Share what you’re seeing. Get real answers you can use on the next pour.Simple as that. Free trial for pros here: https://www.concretelogicpodcast.com/pro SUPPORT THE PODCASTIf this episode helped you…If you learned something…If it made you think differently…Support the show here: https://www.concretelogicpodcast.comThis podcast runs on Value for Value.Give whatever you think the episode was worth. PARTNERSKUIU (performance gear Seth actually uses): https://www.concretelogicpodcast.com/kuiuInterested in advertising or working with us? Email: [email protected] CREDITSProducers: Joseph Swann, Jodi Tandett & Concrete Logic MediaMusic by Mike Dunton: https://www.mdunton.com/WHERE TO FIND CONCRETE LOGICWebsite: https://www.concretelogicpodcast.com YouTube: https://www.youtube.com/@concretelogicpodcast LinkedIn: https://www.linkedin.com/in/sethtandett/Instagram: https://www.instagram.com/concretelogicpodcast/  

PRESENTED BY: GPRS Construction professionals know that utilities and concrete reinforcements can cause big problems when you’re on the job. GPRS helps you avoid them. We use ground penetrating radar to detect rebar, conduit, and post tension cables before you cut, core, or drill. And our concrete scans are 99.8% accurate… we guarantee it—helping you reduce hits, downtime, expenses, and keep your people safe.To keep your jobsite safer, visit https://www.concretelogicpodcast.com/GPRS SUMMARYConcrete strength gets all the attention.But what if the real driver of concrete performance isn’t strength at all?In this episode of the Concrete Logic Podcast, Bob Higgins returns to talk about alkalinity — the chemical environment inside concrete that may control moisture behavior, curing, permeability, and long-term durability.Bob explains why alkalinity is often confused with pH, why salts inside concrete can trap moisture that testing methods never see, and why modern cement chemistry may be quietly changing how concrete cures and performs.If you’ve ever wondered why concrete behaves differently today than it did decades ago, this conversation will make you think.WHAT YOU’LL LEARN· What alkalinity actually means in concrete chemistry · Why pH and alkalinity are not the same thing · The two alkaline salts that control moisture behavior in concrete · Why salts can trap moisture that RH tests can’t detect · How high alkalinity can lead to permeable, weaker surface concrete · The difference between porosity and permeability · Why precast heat curing can change long-term durability · Why compressive strength often fails as a durability indicator · How cement kiln dust may have increased alkalinity in modern cementCHAPTERS00:00 Introduction 02:20 What alkalinity means in concrete 03:10 Why salts control moisture behavior 07:40 Why RH probes can miss trapped moisture 10:20 Calcium hydroxide vs sodium hydroxide 14:00 Self-desiccation and modern cement chemistry 18:00 Where alkalinity in concrete comes from 23:30 Signs of high alkalinity in concrete 24:00 Why precast surfaces can be more permeable 26:00 Porosity vs permeability explained 29:00 Why compressive strength can mislead durability 31:20 Why sealers often fail long term 33:00 Alkali-silica reaction explained 35:00 Why alkalinity isn’t being studied enough 38:00 Why RH specifications often don’t make sense 39:00 Preview: additional forms of moisture in concrete GUESTBob HigginsChief Scientisthttps://www.concretelogicpodcast.com/guests/robert-higgins/ CONCRETE LOGIC ACADEMYIf you like what you’re learning on the podcast, the Concrete Logic Academy Unlimited Pro Membership is where it all comes together.We take the topics you hear on the show and turn them into structured courses—with real explanations, supporting material, and quizzes so you actually retain it.Most people in this industry learn by trial and error.This is how you get ahead without paying for mistakes.Many courses qualify for PDHs and CEUs.Start your free trial here: https://www.concretelogicpodcast.com/pro SUPPORT THE PODCASTIf the Concrete Logic Podcast has helped you learn something new or connect with someone in the industry, consider supporting the show.Donate here: https://www.concretelogicpodcast.com/supportLooking for great hunting or work gear: https://www.concretelogicpodcast.com/kuiuInterested in advertising or media services? https://www.concretelogicpodcast.com/partner-with-concrete-logic-podcast/ CREDITSProducers: Jodi Tandett, Concrete Logic MediaMusic by Mike Dunton https://www.mdunton.com/ WHERE TO FIND SETHWebsite: https://www.concretelogicpodcast.com LinkedIn: https://www.linkedin.com/in/sethtandett/ YouTube: https://www.youtube.com/@concretelogicpodcastUntil next time, let’s keep it concrete! 

PRESENTED BY: CONCRETE LOGIC ACADEMY Practical education and ongoing development for concrete professionals at every stage of their career. Join here: https://www.concretelogicacademy.com/Superflat concrete floors didn’t just appear overnight.They evolved through decades of trial, error, and innovation.In this episode of the Concrete Logic Podcast, Chad White from Structural Services Inc. (SSI) returns to explain how the industry went from checking floors with a 10-foot straightedge to producing high-tolerance floors for robotics, automated warehouses, and high-bay storage systems.Chad has more than 40 years of experience in concrete construction, starting as a cement mason apprentice before running his own company and later becoming a senior concrete consultant with SSI. He has worked on defined-traffic superflat floors, random-traffic high-tolerance slabs, suspended slabs, and industrial floor systems across the country.We talk about how the means and methods have changed, what actually defines a “superflat” floor, and why today’s demands for automation and robotics are pushing tolerances tighter than ever.If you’ve ever wondered how contractors actually hit FF, FL, and F-min numbers, this episode explains the real-world process behind it.WHAT YOU’LL LEARN·       What actually qualifies as a superflat concrete floor·       How floors were measured before the F-number system·       Why laser screeds and float pans changed everything·       The difference between defined-traffic (F-min) and random-traffic floors·       Why robotics and automated warehouses are demanding flatter floors·       Where most grinding corrections occur on high-tolerance slabs·       Why slump consistency and placement rate matter more than exotic mix designs·       How laser scanning and real-time data could change floor flatness control in the futureCHAPTERS00:00 Introduction and episode overview02:40 Early methods for measuring floor flatness05:15 How superflat floors started in warehouse logistics08:40 Measuring FF, FL, and F-min floors12:00 The history of the F-number system16:30 How superflat floors were built in the 1980s22:00 Bump cutting and manual finishing methods28:30 Profilographs and corrective grinding31:00 High-tolerance random traffic floors34:00 Laser screeds and float pans change the industry37:00 Modern methods for producing flatter floors39:00 Mix design considerations for superflat slabs42:00 The future of floor flatness measurementGUESTChad White Structural Services Inc. (SSI)https://www.concretelogicpodcast.com/guests/chad-white/CONCRETE LOGIC ACADEMYIf you enjoy the educational side of the podcast, check out the Concrete Logic Academy.The Academy takes topics from the podcast and turns them into structured learning courses with quizzes and supporting material. Many courses qualify for PDHs and CEUs for engineers and industry professionals.Learn more here:https://www.concretelogicacademy.comSUPPORT THE PODCASTIf the Concrete Logic Podcast has helped you learn something new or connect with someone in the industry, consider supporting the show.Donate here:https://www.concretelogicpodcast.com/supportLooking for great hunting gear: https://www.concretelogicpodcast.com/kuiuInterested in advertising or media services? [email protected]: Scott Reed, Jodi Tandett, Concrete Logic MediaMusic by Mike Duntonhttps://www.mdunton.com/WHERE TO FIND SETHWebsite: https://www.concretelogicpodcast.comLinkedIn: https://www.linkedin.com/in/sethtandett/YouTube: https://www.youtube.com/@concretelogicpodcastUntil next time, let’s keep it concrete!

PRESENTED BY: CONCRETE LOGIC ACADEMYPractical education and ongoing development for concrete professionals at every stage of their career.Join here: https://www.concretelogicacademy.com/  EPISODE SUMMARYYou get the 28-day report.It’s low.Now what? In this episode, Seth sits down with Josh Agee, Concrete Quality Assurance Manager at F.A. Wilhelm Construction, to walk through what actually happens when a cylinder comes back below strength.Who do you call first?Is it the mix? The placement? The testing company?When do you use a Swiss hammer? When do you core? And what really matters — the cylinder… or the in-place concrete?This is a practical, field-level conversation about investigating low breaks, managing risk, and protecting your project before things spiral.If you work in structural concrete, this isn’t hypothetical.It’s coming.  WHAT YOU’LL LEARN • Why reviewing batch tickets is the first move • Why the middle third of the truck matters when sampling • How poor field curing can destroy cylinder results • What most people misunderstand about testing tech responsibility • When to use Swiss hammers and Windsor probes • Why coring is often the final answer • What the rolling average actually tells you • When concrete must be removed — and when it doesn’t • How better pre-pour meetings reduce risk  CHAPTERS 00:00 – The low break email no one wants 03:29 – Investigating batch tickets and water additions 05:26 – Why pre-pour meetings matter more than you think 08:07 – Cure box mistakes that happen all the time 13:03 – Non-destructive testing and managing risk 15:11 – Coring and what break patterns tell you 18:26 – Rolling averages and statistical outliers 21:16 – Proper sampling: the middle third rule 23:26 – How cylinders get mishandled 25:02 – Labeling errors that create chaos 26:22 – Lessons learned moving forward  GUEST INFOJosh AgeeConcrete Quality Assurance ManagerF.A. Wilhelm ConstructionProfile: https://www.concretelogicpodcast.com/guests/josh-agee/  CONCRETE LOGIC PARTNERSINTELLIGENT CONCRETEConcrete not behaving the way it should?Intelligent Concrete combines lab-level testing with real-world field experience to identify the true root cause of performance issues — not just treat the symptoms.Reach out for help: https://www.concretelogicpodcast.com/intelligent-concrete  CONCRETE LOGIC ACADEMYEarn PDHs in the same straight-talk format as the podcast:Join now: https://www.concretelogicpodcast.com/academy  SUPPORT THE PODCAST (VALUE FOR VALUE)Concrete Logic operates on a Value-for-Value model.If you get value from the show — whether that’s education, perspective, or just something that makes you better at your craft — consider giving value back.Donate here: https://www.concretelogicpodcast.com/donate Producer-level supporters get recognized on the episode. This episode’s Producers: Josh Bong Tom Cummings Thank you for supporting independent concrete education. You can also support the show by purchasing your KUIU work, workout, or hunting gear through our link — 10% goes to the podcast at no additional cost to you: https://www.concretelogicpodcast.com/kuiu Media, sponsorship, or content inquiries: [email protected]  CREDITS Producers: Josh Bong, Tom Cummings, Jodi Tandett & Concrete Logic Media Music by Mike Dunton: https://www.mdunton.com/  WHERE TO FIND SETH https://www.linkedin.com/in/seth-tandett/ https://www.youtube.com/@concretelogicpodcast https://www.concretelogicpodcast.com [email protected]  Until next time…Let’s keep it concrete.