Accession Number : ADA116906

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

Descriptive Note : Final rept. 15 Apr 79-15 Apr 82,

Corporate Author : IOWA STATE UNIV AMES DEPT OF EARTH SCIENCES

Personal Author(s) : Cody,Robert D

PDF Url : ADA116906

Report Date : 30 Jun 1982

Pagination or Media Count : 34

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)

Descriptors :   *Shale, *Crystal growth, *Crystallization, *Heaving, *Prevention, Morphology, Inhibitors, Commercial equipment, Simulation, Subsurface, Nucleation, Gypsum, Calcium compounds, Minerals, Sulfates, Organic compounds, Black(Color), Structural properties

Subject Categories : Geology, Geochemistry and Mineralogy
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE