scholarly journals AVM nuclear glass/steel/claystone system altered by Callovo–Oxfordian poral water with and without cement–bentonite grout at 70°C

2020 ◽  
Author(s):  
Charly Carriere ◽  
Delphine Neff ◽  
Christelle Martin ◽  
Florent Tocino ◽  
Alexis Delanoë ◽  
...  
Keyword(s):  
Bentonite Grout

Field Test of Ethanol/Bentonite Slurry Grouting into Rock Fracture

2006 ◽  
Vol 932 ◽  
Author(s):  
Motoyuki Asada ◽  
Hitoshi Nakashima ◽  
Takashi Ishii ◽  
Sumio Horiuchi
Keyword(s):  
Rock Fracture ◽  
Ground Surface ◽  
Rock Fractures ◽  
Natural Clay ◽  
Groundwater Seepage ◽  
Low Viscosity ◽  
Grouting Material ◽  
Bentonite Slurry ◽  
Bentonite Grout

ABSTRACTCrystalline rocks have fractures which may cause unexpected routes of groundwater seepage. Cement grouting is one of the most effective methods to minimize seepage; however, cement materials may not be suitable for the purpose of extra-long durability, because cement is neutralized or degraded by chemical and physical influence of chemical reaction.Natural clay like bentonite is one of the most promising materials for seepage barrier; however, water/bentonite grout is so viscous that enough amount of bentonite can not be grouted into rock fractures. To increase bentonite content in grout with low viscosity, the utilization of ethanol as a mixing liquid was studied. Ethanol suppresses bentonite swelling, and more bentonite can be injected more than that of water/bentonite slurry. In this paper, grouting into in-situ rock mass fracture from the ground surface was tested to investigate the barrier performance and workability of ethanol/bentonite slurry as a grouting material.

Grouted-in installation of piezometers in boreholes

1995 ◽  
Vol 32 (2) ◽  
pp. 355-363 ◽  
Author(s):  
Gordon T. McKenna
Keyword(s):  
Oil Sands ◽  
Theoretical Basis ◽  
Time Lag ◽  
Fast Response ◽  
Soil Conditions ◽  
Pressure Equalization ◽  
Pore Water Pressures ◽  
Small Change ◽  
Installation Cost ◽  
Bentonite Grout

Because a modern diaphragm-type piezometer tip only requires a small change in fluid volume for pressure equalization, the conventional, large sand intake zone around the piezometer tip can be omitted, and the tip can be grouted in a borehole with cement–bentonite grout. This grouted-in installation method allows simpler and easier installation, accurate readings, fast response to changing formation pore-water pressures, installation in boreholes shared with other geotechnical instruments, and can save 10–75% on the installation cost of a piezometer. The grouted-in installation method can be used for most soil conditions provided that the grout is less permeable than the formation. A theoretical basis for the grouted-in installation method is presented with supporting laboratory and field data from the Syncrude Canada Ltd. oil sands mine. Key words : piezometer, grout, instrumentation, hydraulic conductivity, hydrodynamic time lag, oil sands.

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