What if you were told there’s better concrete out there with more limestone than what’s used in Type IL cement mixes? Sounds crazy, right?

But that’s exactly what we’re exploring today with John Guynn and John Kline. In this episode, we explore ACI 211-7R and its potential to reduce cement content without sacrificing performance. Learn how adjusting particle size distribution, using admixtures, and understanding the water-cement ratio can improve workability and strength. Plus, get insights on the challenges and benefits of low carbon concrete, real-world applications, and the regulatory hurdles that must be overcome to make these innovations standard in construction. Don’t miss it!

What’s Inside: 

• Limestone reduces cement content in concrete mixes. 
• ACI 211-7R provides guidelines for using mineral fillers. 
• Particle size distribution and admixtures optimize performance. 
• Real-world applications demonstrate the benefits of reduced cement mixes. 
• Low carbon concrete excels in strength, workability, and durability. 
• Regulatory challenges exist around water-cement ratios and limestone classification. 
• Smarter material use can reduce costs and improve sustainability. 
• Ongoing research is key to advancing concrete technology. CHAPTERS:
00:00 Introduction to Concrete Innovations
02:56 Understanding ACI 211-7R and Its Implications
06:06 The Role of Limestone in Concrete Performance
08:56 Balancing Performance and Cost in Concrete Mixes
11:58 Water Demand and Its Impact on Concrete Quality
15:00 Particle Size Distribution and Its Importance
17:59 Admixtures and Their Role in Modern Concrete
21:06 Real-World Applications and Case Studies
23:54 Feedback from Finishers and Practical Considerations
29:27 Performance of Low Carbon Concrete
32:13 Regulatory Challenges and Water-Cement Ratio
35:02 Innovations in Cement and SCMs
38:47 Field Testing and Real-World Applications
46:04 Durability Testing and Future Prospects

LISTEN NOW – Every concrete contractor & engineer needs to hear this one!

Guest: John Guynn
Company: Roman Cement
Email: john.guynn@roman-cement.com
Website: www.roman-cement.com (http://www.roman-cement.com)
‍Guest: John Kline
Website: https://www.linkedin.com/in/john-kline-18003010/
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Recommended Resources:
ACI 211-7R.20: Guide for Proportioning Concrete Mixtures with Ground Calcium Carbonate and Other Mineral Fillers: https://www.concrete.org/Portals/0/Files/PDF/Previews/211.7R-20_preview.pdf

Producer: Jodi Tandett
Music by: Mike Dunton
Instagram: @Mike (https://github.com/Mike) _Dunton

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Host: Seth Tandett
Email: seth@concretelogicpodcast.com
LinkedIn: https://www.linkedin.com/in/seth-tandett/
YouTube Channel: https://www.youtube.com/@concretelogicpodcast
Podcast Website: https://www.concretelogicpodcast.com

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