SCA Announces Low-Carbon ASTM C1157 Slag Cement Mix, AWS as 2024 Slag Cement in Sustainable Concrete Award Winner

Fourteen construction projects and two research projects were honored for their exceptional use of slag cement.

Farmington Hills, Mich. April 10, 2025 – The Slag Cement Association (SCA) is proud to announce Low-Carbon ASTM C1157 Slag Cement Mix, AWS as a winner of its 2024 Slag Cement in Sustainable Concrete Awards. The winning projects were unveiled and celebrated on April 2, 2025, during the spring ACI Concrete Convention in Toronto, Ontario, Canada.

An Amazon Web Servies data center campus in Indiana was constructed using ASTM C1157/C1157M compliant cements comprising high percentages of slag cement. Building on ambitious carbon reduction goals set by the owner, an extensive testing effort was executed at Clayco/Concrete Strategies’ test yard in St. Louis, MO, USA. Three full-height tilt-up panels with varying levels of carbon reduction were cast and erected.

As a result of the testing program, the project’s foundation was constructed using a concrete mixture with a global warming potential (GWP) of 103 kgCO2e/yd3, an impressive 60% below the NRMCA V3 2020 Great Lakes Midwest Regional benchmark. Additional mixtures used on site incorporated ASTM C1157/C1157M compliant cements with slag cement contents ranging from 10 to 40% by mass.

“We are very grateful for this recognition from the SCA,” said Ryan Cialdella, Chief Mission Critical and Decarbonization Officer. “We believe that more successful deployments like this one will lead to further learning and growth in the mission critical space and look forward to progressing towards greater reduction of embodied carbon.”

Fourteen construction projects from across the United States and Canada were chosen to showcase the broad applications of slag cement and its impact on creating more durable and resilient concrete. These construction projects were awarded in six categories. The categories include infrastructure, high performance, architectural, durability, innovative applications, and lower carbon concrete. Another slag cement research project was also honored in this year’s program.

“It was a remarkable turnout for exceptional slag cement projects at this year’s Slag Cement in Sustainable Concrete Awards.” stated SCA Membership and Marketing Director Nick Brimley. “It has been inspiring to see SCA’s awards program grow as it continues to celebrate the incredible use of slag cement in concrete construction.”

The 2024 Slag Cement in Sustainable Concrete Construction Award Winners:

Replacement Fuel Bulk Storage Facility, Niagara Falls, New York
Ohio DOT IR 70 and SR 29 Interchange and Roundabout, West Jefferson, Ohio
Expand Cargo Apron – Phase V, Middletown, Pennsylvania
High Performance
TSX Broadway and Palace Theater Redevelopment, New York City, New York
The Couture, Milwaukee, Wisconsin
Architectural
River Sol, Bend, Oregon
760 Ralph McGill Parcel “B” Hotel, Atlanta, Georgia
Durability
MHC Kenworth, Cheyenne, Wyoming
Concrete Pavement Intersection for Middle Road and Hanover Street, Newbury, Massachusetts
Innovative Applications
Testing and Implementation of Low-Carbon ASTM C1157 Slag Cement Mix, New Carlisle, Indiana
Advanced Nuclear Material Research Center (ANMRC), Chalk River, Ontario, Canada
Lower Carbon Concrete
The Seattle Storm Center for Basketball Performance, Seattle, Washington
Crossroads North Building 11, Van Buren, Michigan
Use of Innovative Sustainable and Durable Materials in Concrete Pavements, Monticello, Minnesota

The 2024 Slag Cement in Sustainable Concrete Research Award Winners:

Using Slag Replacement for Enhanced Performance of High-Limestone Cements
Christian Pavlidis, University of Toronto
Project Description: Blended cements and Supplementary Cementitious Materials play an important role in reducing clinker contents as part of the plan to achieve industry carbon reduction targets in North America. Research has shown evidence of a synergistic relationship between raw limestone and slag in cement for improved microstructural properties and improved durability. Currently, the CSA A3001 and ASTM C595 standards allow for the use of Types GUL (IL) and GULb (IT) cement with a maximum of 15% interground limestone, but higher levels of limestone maybe needed to allow, for example, LC3 and other proposed blended cement systems.
In this study, six concrete mixtures were cast with 5-25% limestone content and 0-50% slag replacement to determine if higher-limestone cements can provide equivalent performance to currently allowed Type GU and Type GUL cements with and without slag cement replacement. Results showed that in mixtures with 50% slag, cements with 25% limestone were most effective at mitigating ASR, reducing

More information on the winning construction and research projects can be found at www.slagcement.org/awards.

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