Ready-mix grade Class F, tested for lime reactivity and 28-day strength index so the mix designer gets numbers, not adjectives.
Concrete grade is our most heavily tested product. Every lot carries a full chemical analysis plus a compressive strength activity index measured against a control mortar at 7 and 28 days, so your mix designer can model the replacement level rather than guess at it.
Typical use is 20 to 35 percent replacement in structural concrete, where it reliably delivers lower permeability, better pumpability and reduced thermal cracking in thick sections.