Thermal Property and Density Measurements of Samples Taken from Drilling Cores from Potential Geologic Media

摘要

Density, steady-state conductivity, enthalpy, specific heat, heat capacity, thermal diffusivity and linear thermal expansion were measured on 59 materials from core drill samples of several geologic media, including rock salt, basalt, and other associated rocks from 7 potential sites for nuclear waste isolation. The measurements were conducted from or near to room temperature up to 500 exp 0 C, or to lower temperatures if limited by specimen cracking or fracturing. Ample documentation establishes the reliability of the property measurement methods and the accuracy of the results. Thermal expansions of salts reached 2.2 to 2.8 percent at 500 exp 0 C. Associated rocks were from 0.6 to 1.6 percent. Basalts were close to 0.3 percent at 500 exp 0 C. Specific heats of salts varied from 0.213 to 0.233 cal g exp -1 C exp -1 , and basalts averaged 0.239 cal g exp -1 C exp -1 . Thermal conductivities of salts at 50 exp 0 C were from 0.022 to 0.046 wcm exp -1 C exp -1 , and at 500 exp 0 C, from 0.012 to 0.027 wcm exp -1 C exp -1 . Basalts conductivities ranged from 0.020 to 0.022 wcm exp -1 C exp -1 at 100 exp 0 C and 0.016 to 0.018 at 500 exp 0 C. There were no obvious conductivity trends relative to source location. Room temperature densities of salts were from 2.14 to 2.29 gcm exp -3 , and basalts, from 2.83 to 2.90 gcm exp -3 . The extreme friability of some materials made specimen fabrication difficult. 21 references, 17 figures, 28 tables. (ERA citation 09:005785)