ABSTRACT
To confidently develop a site-specific, mineralogy-dependent creep law, it is necessary to have creep data from laboratory tests conducted at different stress and temperature conditions on specimens whose mineral composition vary. The development of the creep law presented in this paper relied heavily on compiled historical data. The available dataset was obtained from several proprietary testing programs, that satisfied these requirements. The mineral compositions of the specimens varied from nearly pure halite to a sylvite composition greater than 50 percent, and the carnallite compositions ranged from 0 percent to approximately 13 percent. Most of the creep data are from tests conducted at temperatures between 26.0°C and 27.5°C, but a few of the creep tests were conducted at a temperature of 35.0°C.
