Cement technology for plugging boreholes in radioactive-waste-repository sites. Progress report, October 1, 1978-September 30, 1979 Page: 4 of 21
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CEMENT TECHNOLOGY FOR PLUGGING BOREHOLES IN RADIOACTVE WASTE
REPOSITORY SITES: PROGRESS REPORT FOR THE PERIOD
OCTOBER 1, 1976, TO SEPTEMBER 30, 1979
J. G. Moore, M. T. Morgan, E. W. McDaniel,
H. 1. Green, and G. A. West
Laboratory evaluations were made of several borehole
plug formulations proposed for the Bell Canyon field test.
Measurements included compressive strength, permeability,
density, and thermal conductivity. A few preliminary tests
with saltcrete formulations showed no significant difference
in physical properties of the solid as a function of fly ash
or cement composition. The saltcrete proposed for the field
test gave acceptable pushout strength and permeability values
using miniature borehole plugs in anhydrite. Similar labora-
tory tests made with a freshwater formulation indicated high
permeability. Electron micrographs showed dissolution cav:-
ties or cracks at the plug-wall interface. These studies
showed that the reactions occurring between the borehole plug
and the adjacent rock wall are an important factor in obtain-
ing a good seal and that laboratory tests are useful to indi-
cate the possibility of success or failure of field tests.
Abstracts of separate reports on permeability expe[;-
ments and systematic studies of pozzolanic cement an'- s-t--
cretes are included.
In the selection of a site for use as a permanent repository for
radioactive wastes, provision must be made to seal (plug) all holes
drilled in the area to ensure the integrity of the site. These plugs
must form leakproof bonds with the wall rock and must have lifetimes
comparable to the surrounding rock formations. An evaluation of pre-
vious work indicated the! one of the more viaie solutions involves the
use of cementitious mate-.ials.1
The Cement Technology for Borehole Plugging Program was established
to assist the Office of Waste Isolation [now the Office of Nuclear Waste
Isolation (ONWI)] in devising and testing cementitious mixtures suitable
for plugging drill holes that way represent 1 hazard to a radioactive
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Moore, J.G.; Morgan, M.T.; McDaniel, E.W.; Greene, H.B. & West, G.A. Cement technology for plugging boreholes in radioactive-waste-repository sites. Progress report, October 1, 1978-September 30, 1979, report, August 1, 1980; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1206748/m1/4/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.