Cement encapsulation of low-level waste liquids. Final report Page: 29 of 35
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Additional testing was done on cores taken from Type I and Type V production drums that represented
production drums with the lowest process control plan (PCP) presolidification cube compressive strength
values. These cores were subjected to both compressive strength and immersion testing. The average
compressive strength for the Type I core was 1640 psi after compressive strength testing, and 1980 psi after
immersion testing. The average compressive strength for the Type V core tested was 1710 psi after com-
pressive strength testing, and 1 140 psi after immersion testing. These additional tests confirmed that com-
pressive strengths and post-immersion strengths exceeded minimum requirements for both Type I and Type V
drums.
At the request of the NRC, compressive strength testing also was done on Type V drums made with 20 wt.
% TDS decontaminated sludge wash solution. Cores were taken from a Type V drum with this lower waste
loading after 651 days of cure. Cores used for immersion tests showed a post-immersion compressive
strength of 970 psi, which clearly exceeded the required strength of 848 psi.
As demonstrated by the testing done on core samples taken from drums produced after the transition phase
between supernatant and sludge wash processing, acceptable stability criteria could be achieved by using
Type I or Type V portland cement and the sludge wash recipe. Sludge wash recipe qualification testing
successfully identified a number of factors affecting waste form stability, including pH and sulfate concentra-
tion. The final qualified recipe used Type V portland cement as the binding agent to ensure waste form
stability.19
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Baker, M. N. & Houston, H. M. Cement encapsulation of low-level waste liquids. Final report, report, January 1, 1999; United States. (https://digital.library.unt.edu/ark:/67531/metadc711567/m1/29/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.