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.

• Record URL:
  https://doi.org/10.1061/(ASCE)MT.1943-5533.0000456
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • Copyright © 2012 American Society of Civil Engineers
• 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
• 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