Contractors survey stakeholders on portland-limestone cement concretes

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Sources: American Concrete Institute, Farmington Hills, Mich.; CMCM staff

Crews finish EcoCem portland-limestone cement concrete slab at Heidelberg Materials new Mitchell, Ind. production line.

American Concrete Institute Committee 302, Construction of Concrete Floors, and the American Society of Concrete Contractors are inviting practitioners to share their experiences placing and finishing mixes bearing ASTM C595, Type IL portland-limestone cement (PLC). Their 15-question survey, posted here, launches as cement producers rapidly roll out Type IL—typically ground clinker plus 5-15 percent limestone—and promote the blended binder as a lower carbon alternative to traditional clinker-only ASTM C150 Type I/II powder. Responses will inform ACI 302 and ASCC guidance on Type IL concrete slab and structure practice. The survey follows the recent debut of the ASCC ALERT! bulletin series, the premier edition spotlighting PLC concrete.

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