Natural pozzolans might boost durability—but they come with trade-offs. In this clip, Joseph E. Thomas breaks down how natural pozzolans affect water demand in concrete compared to fly ash, and what that means for workability, mix design, and cost. If you're working with DOT specs or slump requirements, this one's…
Roman concrete is still standing after 2,000 years—so what are we doing wrong today? Joseph E. Thomas explains how natural pozzolans not only improve durability but also slash the carbon footprint of concrete by up to 95%. If you’re serious about longevity and sustainability, this clip is worth your time.
Natural pozzolans aren’t just ancient history—they're volcanic in origin and chemically reactive in modern concrete. In this clip, Joseph E. Thomas explains why materials like pumice, tephra, and obsidian can replace cement and still build strength and durability. Learn what makes these volcanic materials so effective and how they compare…
What if the answer to today’s concrete durability and sustainability challenges isn’t new—but something we left behind decades ago? In Episode #129 of the Concrete Logic Podcast, host Seth Tandett talks with Joseph E. Thomas, Executive Director of the Natural Pozzolan Association, about a material used in the Hoover Dam…
What if the answer to today’s concrete durability and sustainability challenges isn’t new—but something we left behind decades ago? In Episode #129 of the Concrete Logic Podcast, host Seth Tandett talks with Joseph E. Thomas, Executive Director of the Natural Pozzolan Association, about a material used in the Hoover Dam…
What’s the one skill that separates talkers from true leaders in the concrete industry? Seth Tandett sits down with James Baty, Executive Director of the Concrete Foundations Association, to talk about why communication, listening, and follow-up might be more important than specs and slump tests for your career. They cover…
What’s the one skill that separates talkers from true leaders in the concrete industry? Seth Tandett sits down with James Baty, Executive Director of the Concrete Foundations Association, to talk about why communication, listening, and follow-up might be more important than specs and slump tests for your career. They cover…
When concrete fails, who’s really at fault—the material or the people using it? In this episode of the Concrete Logic Podcast, host Seth Tandett is joined by Dr. Jon and Rich to tackle the growing frustrations with Type 1L cement. They ask the hard questions: Is cement the problem? Are…
When concrete fails, who’s really at fault—the material or the people using it? In this episode of the Concrete Logic Podcast, host Seth Tandett is joined by Dr. Jon and Rich to tackle the growing frustrations with Type 1L cement. They ask the hard questions: Is cement the problem? Are…
In this clip from Episode #126 of the Concrete Logic Podcast, Seth Tandett points out how the industry’s shift to Type IL cement is still rooted in a foundational 2011 report. Even the 2024 update leans heavily on the original. If you’re relying on the latest specs without ever reading…
In this clip from Episode #126 of the Concrete Logic Podcast, Seth Tandett uncovers a warning buried in a key PLC report: when limestone content isn’t properly optimized, concrete strength can drop—sometimes significantly. The report even includes a figure showing how excess limestone and poor fineness control lead to reduced…
In this clip from Episode #126 of the Concrete Logic Podcast, Seth Tandett breaks down a major difference in how Europe and the U.S. enforce moist curing practices—especially when Portland Limestone Cement (PLC) is involved. Countries like Germany and the Netherlands strictly enforce 7-day wet curing for public infrastructure. Meanwhile,…
