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SCIC #1 - Slag Cement
Slag cement, or ground granulated blast furnace slag (GGBFS), has been incorporated into concrete projects in the U.S. for over a century to improve durability and reduce life cycle costs. Among its measurable benefits in concrete are better workability and finishability, higher compressive and flexural strengths, and improved resistance to aggressive chemicals. SCIC #1, Slag Cement, provides an introduction to the material's benefits, manufacturing process, and relevant terminology, and makes an excellent primer for those new to the cement and concrete industry. |
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SCIC #11 - Slag Cement and Fly Ash
Slag cement and fly ash are supplementary cementitious materials often included in contemporary concrete mixes. SCIC #11, Slag Cement and Fly Ash, compares the two materials, explaining that while chemical similarities exist between them, they exert different influences in concrete applications. Slag cement is a hydraulic cement while fly ash is a pozzolan. This information sheet lists the properties slag cement can bring to concrete in both plastic and hardened form. For example, the addition of slag cement usually results in reduced need for water, faster time of set, improved pumpability and finishability, higher 28-day strength, lower permeability, resistance to sulfate attack and alkali-silica reactivity (ASR), and lighter color. |
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SCIC #21 - Blended Cements
According to ACI 116, blended cements consist "essentially of an intimate and uniform blend" of a number of different materials. Slag cement can be used to produce blended cement that complies with ASTM C 595, Standard Specification for Blended Hydraulic Cements, and as a constituent in hydraulic cements produced under ASTM C 1157, Standard Performance Specification for Hydraulic Cement. SCIC #21, Blended Cements, explains how materials are blended, and the role slag cement can play in blended cement. Blended cement may allow some concrete producers to take advantage of the benefits of slag cement despite storage constraints. |
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