Title:
Concrete Testing Case for Closure of Handford’s 241-C Underground Storage Tanks
Author(s):
Michelle L. Hendrickson, Christine A. Langton, and Joan Q. Wu
Publication:
Symposium Paper
Volume:
361
Issue:
Appears on pages(s):
71-91
Keywords:
formula development; laboratory and field-scale testing; self-consolidating grout.
DOI:
10.14359/51740608
Date:
3/1/2024
Abstract:
Sixty percent of the nation's highly toxic and radioactive mixed wastes are stored at Hanford in 177 deteriorating underground storage tanks. To close or remove these storage tanks from service and place them in a condition that is protective of human health and the environment, the tanks must be physically stabilized to prevent subsidence once wastes have been retrieved. Remaining residual liquid waste in the tanks that cannot be removed must be solidified and the solid wastes encapsulated to meet the Nuclear Regulatory Commission, Department of Energy, Environmental Protection Agency, and the State of Washington requirements. The Department of Energy has developed cementitious flowable concretes to restrict access and provide chemical stabilization for radionuclides. Formulation, laboratory, and field testing for application at Hanford began with flowable, self-leveling structural and non-structural fills. A slump flow equal to or greater than 610 mm, 0% bleed water, and 0.1% (by volume) shrinkage measurements were key parameters guiding reformulation efforts that resulted in highly flowable, self-consolidating concretes that met Hanford 241-C Tank closure short- and long-term regulatory and engineering performance requirements.
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