MICROSTRUCTURAL AND PHASE CHARACTERISTICS OF PHOSPHOGYPSUM-CEMENT MIXTURES

Researchers studied the effects of the tricalcium aluminate content of the stabilizing cement, curing time, proportion of phosphogypsum (PG), grain size, and impurities in PG on the microstructural and phase properties of gypsum/PG and cement mixtures--a potential road-base material. Morphologically, two types of ettringite were found in the cement and gypsum/PG mixtures. The impurities in PG retarded the initial hydration of cement in direct proportion to its amount in the mixtures. However, gypsum/PG increased the degree of hydration of cement in the mixture in the long term. Further, a large amount of ettringite was produced by the reacted gypsum/PG, compared to cement only. The amount of carbonation was uniformly low.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Roy, A
  • Kalvakaalava, R
  • Seals, R K
• Publication Date: 1996-2

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 11-18
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 8
  • Issue Number: 1
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Carbonation; Concrete curing; Ettringite; Grain size; Gypsum cement; Hydration; Impurities; Microstructure; Pavement base course; Phosphoric acid; Tricalcium aluminate
• Old TRIS Terms: Phase studies
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00719275
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 16 1996 12:00AM