MICROSTRUCTURE OF CEMENT-BASED GROUTS CONTAINING FLY ASH AND BRINE

This study examines the microstructure properties of cement-based grout consisting of Type III rapid hardening portland cement, Saskatchewan fly ash, and brine. The liquid brine is composed mainly of salts of sodium, calcium, potassium, and magnesium. A scanning electon microscope (SEM), with an eletron probe x-ray microanalyzer, was used to study the mechanism by which fly ash and brine alters the microstructure characteristics of cement grouts under confining pressures of 0, 3.4, and 6.9 MPa. Examination showed that grout mixes containing brine had a gel-like substance covering the entire surface of the hydrated products. This gel-like substance consists mainly of sodium chloride salt. Fly ash cement particles were also found to be encapsulated by the sodium chloride gel-like substance. This encapsulation may decrease the rate of pozzolonic reaction between the fly ash particles and the lime available in the cement.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 635-654
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00624325
  • Record Type: Publication
  • Report/Paper Numbers: SP-132
  • Files: TRIS
  • Created Date: Oct 19 1993 12:00AM