Prevention of Heaving in Structures Built on Black Shale by Prevention of Crystal Growth within the Shales.

Abstract

This project investigated the effects of commercial inhibitor and other organic chemicals on the nucleation, growth rates, precipitate mineralogy, and crystal morphology of calcium sulfate minerals. The major goal of the study was to determine if black shale heave, a construction engineering problem caused by subsurface gypsum growth, might be minimized within laboratory simulations of the heave environment by crystallization inhibitor chemicals. Under acid conditions which characterize black shale heave environments, one inhibitor, diethylene triamine penta(methylene phosphonic acid) was clearly more effective than other commericial inhibitor substances and may be significantly effective in minimizing black shale heave. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1982
Accession Number
ADA116906

Entities

People

  • Robert D. Cody

Organizations

  • Iowa State University

Tags

DTIC Thesaurus Topics

  • Acids
  • Additives (Chemicals)
  • Calcium Compounds
  • Crystal Growth
  • Crystallization
  • Crystals
  • Earth Sciences
  • Inhibition
  • Inhibitors
  • Low Temperature
  • Macromolecules
  • Nucleic Acids
  • Organic Materials
  • Phosphonic Acids
  • Plastic Explosives
  • Precipitation
  • Test Methods

Readers

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  • Surface Coatings Technology.