Keywords and Phrases
Annular Seal; Bentonite; Cement-Bentonite; Grout; Hydraulic Conductivity; Permeability
"Grout is the material used in the annulus of water supply and monitoring wells to prevent movement of water from adjacent formations or from the land surface into the well. Grout is critical for preventing cross-contamination of aquifers through a borehole when a single well penetrates multiple aquifers and for protecting aquifers from surface contamination. The composition and emplacement of grout is regulated in most states, with standard mixes of bentonite and cement being the most widely used types of grout. Despite widespread adoption of grout regulations, surprisingly little literature is available to describe the effectiveness of different grout mixtures. This study investigates the effectiveness of three bentonite-cement mixes (3%, 6%, and 12% bentonite by weight) and cement grout without bentonite. The study tests the hydraulic conductivity of each mixture as a function of grout composition and bonding of grout to the well casing. Results show that as the ratio of bentonite is increased the hydraulic conductivity decreased, however between 3% and 6% bentonite the hydraulic conductivity begins to increase"--Abstract, page iii.
Grote, Katherine R.
Gertsch, Leslie S.
Rogers, J. David
Geosciences and Geological and Petroleum Engineering
M.S. in Geological Engineering
Missouri University of Science and Technology
viii, 46 pages
© 2017 Amy Lynn Norval
Thesis - Open Access
Electronic OCLC #
Norval, Amy Lynn, "Hydraulic conductivity testing of cement-bentonite mixes for use in annular well seals" (2017). Masters Theses. 7654.