The American Cement Association (ACA) released its latest information sheet, “How Are Blended Cement Standards Changing in 2026?”, a concise overview of important upcoming updates to the ASTM C595 and AASHTO M 240 standard specifications for blended cements.
Approved for the 2026 editions and expected to be published around Aug. 1, these changes include revisions to compositional limits for blended cement constituents, updates to how sulfate resistance is determined for Type IL cements, and adjustments to allowable limits for magnesium oxide (MgO) and loss on ignition (LOI).
Both standards will also introduce a new, user-friendly table outlining constituent limits, making specification requirements easier to interpret. In addition, ASTM C595 (only) will define a new blended cement: Type IC composite cement.
ACA said the information sheet provides a clear, practical summary to help producers and customers understand what’s changing and how it may impact operations. Be sure to review it here and stay ahead of these important industry updates.
