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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