Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Final report of the rock sealing project - Sealing properties and longevity of smectitic clay grouts
Na and Ca bentonite clay grouts with densities that make them easily injected into fine fractures have been hydrothermally treated and investigated with respect to the hydraulic conductivity and shear strength. Exposure of the grouts to salt groundwater increased the hydraulic conductivity up to around 10(sup -5) m/s, which is on the same order of magnitude as the value at complete conversion of soft montmorillonite clay to hydrous mica, i.e. the major ultimate reaction product. Still, even this 'worst scenario' case will not lead to a higher bulk conductivity of the grouted rock than around 10(sup -10) m/s of rock with a conductivity of 10(sup -8) m/s before grouting. The rate of such conversion, which is entirely dependent on the potassium content of the groundwater, can be anything from a few hundred years to several thousand years depending primarily on the magnitude of prevailing hydraulic gradients. The shear strength of the grouts, which determines the resistance to piping and erosion, increases with time and temperature. The most critical situation is immediately after injection into the rock, when hydraulic gradients exceeding about 30 may produce piping. (au). (Atomindex citation 23:072364)
Final report of the rock sealing project - Sealing properties and longevity of smectitic clay grouts
Na and Ca bentonite clay grouts with densities that make them easily injected into fine fractures have been hydrothermally treated and investigated with respect to the hydraulic conductivity and shear strength. Exposure of the grouts to salt groundwater increased the hydraulic conductivity up to around 10(sup -5) m/s, which is on the same order of magnitude as the value at complete conversion of soft montmorillonite clay to hydrous mica, i.e. the major ultimate reaction product. Still, even this 'worst scenario' case will not lead to a higher bulk conductivity of the grouted rock than around 10(sup -10) m/s of rock with a conductivity of 10(sup -8) m/s before grouting. The rate of such conversion, which is entirely dependent on the potassium content of the groundwater, can be anything from a few hundred years to several thousand years depending primarily on the magnitude of prevailing hydraulic gradients. The shear strength of the grouts, which determines the resistance to piping and erosion, increases with time and temperature. The most critical situation is immediately after injection into the rock, when hydraulic gradients exceeding about 30 may produce piping. (au). (Atomindex citation 23:072364)
Final report of the rock sealing project - Sealing properties and longevity of smectitic clay grouts
R. Pusch (Autor:in) / O. Karnland (Autor:in) / H. Hoekmark (Autor:in) / T. Sanden (Autor:in) / L. Boergesson (Autor:in)
1991
200 pages
Report
Keine Angabe
Englisch
Radiation Pollution & Control , Radioactive Wastes & Radioactivity , Geology & Geophysics , Hydrology & Limnology , Grouting , Geologic Fractures , Radioactive Waste Disposal , Sealing Materials , Bentonite , Erosion , Experimental Data , Ground Water , Hydraulic Conductivity , Physical Properties , Underground Disposal , Tables(data) , Foreign technology , EDB/052002
Structural bonding and sealing grouts with reaction resin grouts
| British Library Conference Proceedings | 2000
Advanced smectitic clay research
| Online Contents | 2010