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Sealing properties of cement-based grout materials. Final report on the Rock sealing project
This report presents the results of laboratory studies of material properties. A number of different high performance grouts were investigated. The laboratory studies focused on mixtures of sulphate resistant portland cement, silica fume, superplasticizer and water. The ability of the thin films to self seal was confirmed. The surface reactions were studied in specimens of hardened grouts. The leach rates were found to vary with grout and water composition and with temperature. The short-term hydraulic and strength or properties of the hardened grout were determined. These properties were determined for the grouts both in-bulk and as thin-films. The hydraulic conductivities of the bulk, hardened material were found to be less than 10(sup -14) m/s. The hydraulic conductivities of thin films were found to be less than 10(sup -11) m/s. Broken, the hydraulic conductivity of the thin films could be increased to 10(sup -7) m/s. Examination of the leached grout specimens revealed a trend for the pore sizes to decrease with time. The propensity for fractured grouts to self seal was also observed in tests in which the hydraulic conductivity of recompacted mechanically disrupted, granulated grouts was determined. These tests showed that the hydraulic conductivity decreased rapidly with time. The decreases were associated with decreases in mean pore size. In view of the very low hydraulic conductivity it is likely that surface leaching at the grout/groundwater interface will be that major process by which bulk high-performance grouts may degrade. With the completion of the laboratory, in situ and modelling studies it appears that high-performance cement based grouts can be considered as viable materials for some repository sealing applications. Some of the uncertainties that remain are identified in this report. (54 refs.). (Atomindex citation 24:032421)
Sealing properties of cement-based grout materials. Final report on the Rock sealing project
This report presents the results of laboratory studies of material properties. A number of different high performance grouts were investigated. The laboratory studies focused on mixtures of sulphate resistant portland cement, silica fume, superplasticizer and water. The ability of the thin films to self seal was confirmed. The surface reactions were studied in specimens of hardened grouts. The leach rates were found to vary with grout and water composition and with temperature. The short-term hydraulic and strength or properties of the hardened grout were determined. These properties were determined for the grouts both in-bulk and as thin-films. The hydraulic conductivities of the bulk, hardened material were found to be less than 10(sup -14) m/s. The hydraulic conductivities of thin films were found to be less than 10(sup -11) m/s. Broken, the hydraulic conductivity of the thin films could be increased to 10(sup -7) m/s. Examination of the leached grout specimens revealed a trend for the pore sizes to decrease with time. The propensity for fractured grouts to self seal was also observed in tests in which the hydraulic conductivity of recompacted mechanically disrupted, granulated grouts was determined. These tests showed that the hydraulic conductivity decreased rapidly with time. The decreases were associated with decreases in mean pore size. In view of the very low hydraulic conductivity it is likely that surface leaching at the grout/groundwater interface will be that major process by which bulk high-performance grouts may degrade. With the completion of the laboratory, in situ and modelling studies it appears that high-performance cement based grouts can be considered as viable materials for some repository sealing applications. Some of the uncertainties that remain are identified in this report. (54 refs.). (Atomindex citation 24:032421)
Sealing properties of cement-based grout materials. Final report on the Rock sealing project
M. Onofrei (author) / M. Gray (author) / B. Shenton (author) / B. Walker (author) / R. Pusch (author)
1992
209 pages
Report
No indication
English
Radioactive Wastes & Radioactivity , Ceramics, Refractories, & Glass , Radiation Pollution & Control , Sealing Materials , Cements , Radioactive Waste Disposal , Experimental Data , Grouting , High-Level Radioactive Wastes , Hydraulic Conductivity , Leaching , Materials Testing , Permeability , Porosity , Rheology , Surface Properties , Temperature Dependence , Underground Disposal , Tables(data) , Foreign technology , EDB/360603 , EDB/052002
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