Formulating Low-Energy Cement Products
The study examined several formulations that may serve as a green substitute for traditional portland cement. The primary objective of the project was to produce a durable, low-energy cementitious material from flue gas desulfurization (FGD) gypsum that was converted to hemihydrate. The study also included spent ash from circulating fluidized bed combustion (CFBC), and Class F fly ash. Hemihydrate would give the by-product cement early strength development, and the spent-bed/ultrafine ash blend would provide the by-product cement with long-term strength (gaining slowly at first) and decrease solublity. A spent-bed/ultrafine ash ratio of 40/60 produced the best compressive-strength results of the preliminary clinkerless cement blends produced in the study. The expansion of these clinkerless cements was caused by the formation of ettringite shown by X-ray diffraction (XRD). The system stopped expanding when calcium hydroxide was largely consumed. Substituting 50% of the clinkerless cement blends with hemihydrate increased short-term compressive strength 200% and reduced longer-term expansion up to 90%, enabling the production of low-energy 100% by-product cement.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
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Supplemental Notes:
- Copyright © 2012 American Society of Civil Engineers
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Authors:
- Rust, David
- Rathbone, Robert
- Mahboub, Kamyar C
- Robl, Tom
- Publication Date: 2012-9
Language
- English
Media Info
- Media Type: Digital/other
- Features: References;
- Pagination: pp 1125-1131
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Serial:
- Journal of Materials in Civil Engineering
- Volume: 24
- Issue Number: 9
- Publisher: American Society of Civil Engineers
- ISSN: 0899-1561
- EISSN: 1943-5533
- Serial URL: http://ascelibrary.org/journal/jmcee7
Subject/Index Terms
- TRT Terms: Blends; Cement; Compressive strength; Desulfurization; Flue gases; Fly ash; Formulations; Gypsum; Mix design
- Uncontrolled Terms: Hemihydrates
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 01454316
- Record Type: Publication
- Files: TRIS, ASCE
- Created Date: Nov 19 2012 9:41AM