In this episode of the Concrete Logic podcast, host Seth Tandett speaks with Larry Sutter, principal engineer at Sutter Engineering, about the development of standards and specifications for supplementary cementitious materials (SCMs) like fly ash and slag. They discuss the differences between standards and specifications, the role of fly ash in improving concrete durability, and the challenges of variability in materials. Larry also highlights emerging test methods for evaluating SCMs and the importance of performance-based specifications in the industry. Takeaways Standards are documents developed through a consensus process. Specifications serve as contracts between buyers and sellers. Fly ash is the most used SCM in concrete. SCMs improve concrete durability by reducing permeability. Variability in materials is a constant challenge in concrete engineering. Performance-based specifications are preferred over prescriptive ones. Emerging materials require new performance-based specifications. Understanding the reactivity of SCMs is crucial for concrete performance. The industry must adapt to evolving standards and specifications. Future specifications aim to encompass a wider range of SCMs. Chapters 00:00 Introduction to Standards and Specifications 03:09 Understanding Standards vs Specifications 10:17 The Role of Fly Ash in Concrete 18:03 Mechanisms of Durability Improvement 22:52 Emerging Test Methods for SCMs 30:21 Challenges in SEM Usage and Specifications 35:37 Performance-Based Specifications for SCMs 39:43 Future Directions in SCM Standards ***Did you learn something from this episode? Would you like to support the concrete industry's favorite podcast? If so, donate at https://www.concretelogicpodcast.com/support/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ . When YOU donate to the show, you will be listed as a producer of the next episode that is released! Join the Concrete Logic Academy! Enhance your learning from our podcast with engaging quizzes that test your knowledge and help you earn Professional Development Hours (PDHs). Support Concrete Logic and take your education to the next level! 🚀 FIND OUT MORE HERE: https://www.concretelogicacademy.com/*** Episode References Guest: Larry Sutter | Sutter Engineering | sutter.engineering@gmail.comGuest Website:⁠ https://www.linkedin.com/in/larry-sutter-217b358/Producers: Jodi Tandett Donate & Become a Producer: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.concretelogicpodcast.com/support/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Music: Mike Dunton | ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.mikeduntonmusic.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ | ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠mikeduntonmusic@gmail.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ | Instagram ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠@Mike_Dunton⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ Host: Seth Tandett, ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠seth@concretelogicpodcast.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ Host LinkedIn: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.linkedin.com/in/seth-tandett/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Website: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.co