Understanding expansion in calcium sulfoaluminate–belite cements

Calcium sulfoaluminate–belite (CSAB) cements are promoted as sustainable alternatives to portland cement because of their lower energy and CO 2 emissions during production and comparable performance. However, the formation of ettringite, the main hydration product in CSAB cements, can be expansive,...

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Bibliographic Details
Published in:Cement and concrete research 2012, Vol.42 (1), p.51-60
Main Authors: Chen, Irvin A., Hargis, Craig W., Juenger, Maria C.G.
Format: Article
Language:English
Subjects:
Alternative energy sources
Applied sciences
Buildings. Public works
Calcium
Cement concrete constituents
Cements
Clinker
Ettringite (D)
Exact sciences and technology
Expansion
Expansion (C)
Hydration
Materials
Portland cements
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Sulfates
Sulfoaluminate (D)
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Summary:Calcium sulfoaluminate–belite (CSAB) cements are promoted as sustainable alternatives to portland cement because of their lower energy and CO 2 emissions during production and comparable performance. However, the formation of ettringite, the main hydration product in CSAB cements, can be expansive, sometimes resulting in cracking. The factors controlling expansive behavior in CSAB cements have not been completely elucidated. In this study, three CSAB cements synthesized from reagent-grade chemicals with varied phase compositions were examined for dimensional stability in water and sulfate solutions. The interdependent effects of C 4A 3Ŝ (Ye'elimite) content, calcium sulfate content, water-to-cement ratio, and particle fineness on CSAB cement expansion were evaluated. The results show that the expansive behavior can be controlled by altering chemical and physical factors in CSAB clinker, cement, and paste.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2011.07.010