St Marys CemPlus: Slag Cement for Mixes That Ask for More

St Marys CemPlus™ is slag cement supplied as a supplementary material, permitting the design consultant to proportion concrete mixes for performance. Used where specs allow, it lowers concrete's carbon footprint while improving durability and long-term strength. St Marys CemPlus meets ASTM C989, CSA A3001, and AASHTO specifications.

Control in the Mix Designer's Hands

CemPlus arrives as its own material, ready to complement Portland cement or Portland limestone at whatever proportion the design calls for. The concrete develops a finer pore structure, enhances resistance to sulfates and chlorides, and strength that keeps climbing at later ages. Slag cement is often used to slow and lower the heat of hydration in concrete used in mass concrete pours. The most notable uses are crane bases for large high-rise structures and windmill bases.

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Brochures

What CemPlus brings

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A replacement level set by the mix design rather than a fixed blend.

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A reduced carbon footprint, in proportion to the Portland cement or Portland limestone it replaces.

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Improved resistance to sulfate and chloride attack.

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Lower heat of hydration for mass and thick-section pours.

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A lighter concrete color and a smoother finished surface.

Frequently Asked Questions

St Marys CemPlus Availability

Available in Bulk:

  • Bulk Availability: Illinois, Michigan, New York, Ohio, Wisconsin, Ontario, Quebec, Indiana, Iowa, Pennsylvania

Download the Brochure

The St Marys CemPlus brochure covers replacement levels, performance benefits, and the applications where slag cement earns its place.
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St Marys CemPlus - grey St Marys Envirocem Plus cement bags stacked beside a pile of cement powder

Product Data Sheets

Replacement guidance, strength and durability data, and the applicable standards are provided in the product data sheet.

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Safety Data Sheets

The safety data sheet sets out handling, storage, and exposure guidance and should be reviewed before use.

Environmental Product Declarations

St Marys Cement is dedicated to providing meaningful insight into product performance. Our EPDs deliver standardized environmental data that supports informed specification and long-term sustainability planning across a range of applications.
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