The 7.6-Angstrom Reaction Product in Smectite Clay-Lime Mixtures.

Abstract

Several mixtures of hydrated lime with one of three smectite (swelling) clays and water were made. Some mixtures contained fly ash and a little calcite. The strength and mineralogical composition were followed by X-ray diffraction as a function of age. The intent was to grow usable single crystals of 7.6-Angstrom reaction product. When this proved impractical a pure sample of small crystals were hand-picked and studied. This showed that the 7.6-Angstrom material that formed in these mixtures was tetracalcium aluminate carbonate-11 hydrate (monocarboaluminate). The type of exchangeable cation in the clay had no effect on the reaction. On the other hand the presence of magnesium rather than aluminum in the octahedral layer of the clay mineral hectorite prevented the usual reactions because these mixtures never hardened. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1979
Accession Number
ADA075351

Entities

People

  • Alan D. Buck
  • Katharine Mather

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Carbonates
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Concrete
  • Crystal Growth
  • Crystals
  • Diffraction
  • Electron Probes
  • Fly Ash
  • Materials
  • Optical Properties
  • Refractive Index
  • Single Crystals
  • Soil Stabilization
  • Tectosilicates

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Geotechnical Engineering.
  • Materials Science and Engineering.