Method Evaluation And Field Sample Measurements For The Rate Of Movement Of The Oxidation Front In Saltstone

Almond, P. M. ; Kaplan, D. I. ; Langton, C. A. ; Stefanko, D. B. ; Spencer, W. A. ; Hatfield, A. ; Arai, Y.

Savannah River Site (S.C.)

关键词: Saltstone;    12 Management Of Radioactive And Non-Radioactive Wastes From Nuclear Facilities Cement;    Cement;    Disposal Unit;    Slag;   

DOI  :  10.2172/1056464
RP-ID  :  SRNL-STI--2012-00468
RP-ID  :  DE-AC09-08SR22470
RP-ID  :  1056464

美国|英语

来源: UNT Digital Library

【 摘 要 】

The objective of this work was to develop and evaluate a series of methods and validate their capability to measure differences in oxidized versus reduced saltstone. Validated methods were then applied to samples cured under field conditions to simulate Performance Assessment (PA) needs for the Saltstone Disposal Facility (SDF). Four analytical approaches were evaluated using laboratory-cured saltstone samples. These methods were X-ray absorption spectroscopy (XAS), diffuse reflectance spectroscopy (DRS), chemical redox indicators, and thin-section leaching methods. XAS and thin-section leaching methods were validated as viable methods for studying oxidation movement in saltstone. Each method used samples that were spiked with chromium (Cr) as a tracer for oxidation of the saltstone. The two methods were subsequently applied to field-cured samples containing chromium to characterize the oxidation state of chromium as a function of distance from the exposed air/cementitious material surface.