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Title: PSU/WES Interlaboratory comparative methodology study of an experimental cementitious repository seal material : Report 2 : Final results
Authors: Pennsylvania State University. Materials Research Institute.
United States. Department of Energy.
Battelle Memorial Institute. Project Management Division.
Battelle Memorial Institute. Office of Nuclear Waste Isolation.
Roy, D. M.
Grutzeck, M. W.
Mather, Katharine.
Buck, Alan D.
Keywords: Cement grouts
Repository sealing
Interlaboratory comparison
Laboratory tests
Subsurface waste disposal
Underground structures
Radioactive waste disposal
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-81-2 rept.2.
Description: Miscellaneous Paper
Abstract: Two separate laboratories are investigating the possible use of portland cement grout as a repository sealing material for underground isolation of nuclear waste. The laboratories are the Materials Research Laboratory of The Pennsylvania State University (PSU) and the Structures Laboratory (SL) of the U.S. Army Engineer Waterways Experiment Station (WES). The project manager, Mr. Floyd L. Burns of the Office of Nuclear Waste Isolation (ONWI), suggested that these laboratories make a comparative study to determine their ability to obtain results of similar precision and accuracy on potential repository seal materials. This report gives the results of this study. The same cementitious grout mixture was prepared in each laboratory in September 1980, and tests were started. Tests included characterization of cement and fly ash by chemical, physical, x-ray diffraction, and other procedures. Tests of hardened specimens included restrained expansion, compressive strength, modulus of elasticity, density, and permeability and characterization by x-ray diffraction and scanning electron microscopy. Each laboratory made many of the same tests and some that were not directly comparable. This report supersedes ONWI-198 (WES MP SL-81-2), which was preliminary in nature. The present report contains all results of the study. The objectives of the study were to: (A,) Develop a plan which would contribute to ensuring reproducibility of diagnostic methods used in research and development on repository sealing materials. (B.) Compare results of tests performed by similar methods on similar cementitious seal materials, conducted and prepared in each of the two laboratories. (C.) Use the results of complementary, but not identical, tests performed in the two laboratories to confirm the validity of performance-related information gained. (D.) Generate data on a plugging material which could be a candidate for repository sealing in halite or anhydrite host formations or formations containing both halite and anhydrite. There was generally good agreement between the results of the tests that were performed by both laboratories. This provided confidence in their ability to reproduce the results of tests and characterizations. The results indicated that the starting materials received from a common source were highly similar as evaluated in the two laboratories. In the past this has not always been the case. The similarity was possibly better because of the fact that certain of the materials were received by SL, the lots divided and part shipped to PSU. There was also the added accomplishment that where non-identical methods were used in the two laboratories, some provided complementary types of information which in some cases confirmed that the selected proportions for an experimental grout mixture would be satisfactory from a broader range of considerations, both relating to early-age behavior and having implications for longevity in performance. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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