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This content will become publicly available on September 29, 2018

Title: Heating-freezing effects on the orientation of kaolin clay particles

The effects of temperature changes on the particle orientation of a consolidated kaolin are studied using XRD experiments. Here, two sets of equipment were utilized in this study: a benchtop equipment, and a synchrotron beamline at the National Synchrotron Light Source II (NSLS-II) at Brookhaven National Laboratory. The kaolin specimens tested in the benchtop XRD were subjected to elevated and freezing temperatures ex-situ, while those used for the NSLS-II experiment were exposed to the temperature changes in-situ. The temperatures considered in this study range from freezing (-10 °C) to elevated temperature below boiling (90 °C). The thermally-induced reorientation of clay mineral particles is highly dependent on the relative orientation of the clay mineral particles with respect to the applied thermal gradient. For example, kaolin samples with kaolinite particles oriented perpendicular to the thermal gradient, and to the expected thermally-induced pore water flow, experience much higher particles reorientations compared to samples with particles initially oriented parallel to the thermal gradient. Lastly, freezing kaolin preserved its microstructure as ice crystals form.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4] ;  [3]
  1. Stony Brook Univ., NY (United States). Department of Civil Engineering
  2. Stony Brook Univ., NY (United States). Department of Material Science and Engineering
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Nuclear Science and Technology Department
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Publication Date:
Report Number(s):
BNL-203339-2018-JAAM
Journal ID: ISSN 0169-1317
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Applied Clay Science
Additional Journal Information:
Journal Volume: 150; Journal Issue: C; Journal ID: ISSN 0169-1317
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 36 MATERIALS SCIENCE; Kaolin; Kaolinite; Synchrotron light source; X-ray diffraction; Basal plane; Prism plane; Preferred particle orientation; Freezing; Heating; Orientation index; Thermo-mechanical
OSTI Identifier:
1426470