In this clip from Episode #126 of the Concrete Logic Podcast, Seth Tandett highlights a major concern buried in one of the key reports used to promote Portland Limestone Cement (PLC). The report’s own chart shows that as limestone content increases, so does carbonation depth—especially when water-to-cement ratios stay the same. That means more risk of pH drop and steel corrosion over time, particularly if the concrete isn’t properly cured or lacks strength. It's a warning about PLC’s long-term durability that the industry can’t afford to overlook.