ASTM C595 acknowledges 15% limestone threshold

Sources: ASTM International, West Conshohocken, Pa.; National Concrete Masonry Association, Herndon, Va.

The ASTM C595-12 Standard Specification for Blended Hydraulic Cements defines requirements for a new powder: Type IL, portland-limestone blended cement, which includes 5–15 percent limestone as an ingredient. Adoption of Type IL product has the potential to reduce environmental impact of cement production by about 10 percent, while maintaining performance characteristics concrete producers require for specified mixes. The requirements for Type IL cement are the most significant change to C595 in 2012.

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Holcim Canada commercializes 15 percent ground-limestone powder

Sources: Holcim Canada, Mississauga, Ontario; CP staff

On the heels of Canadian Standards Association approval and National Building Code of Canada reference, a new class of portland-limestone cement (PLC) has been recognized in Ontario and Quebec building codes as an alternative to ASTM C150-equivalent or CSA General Use powder.

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