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A platform for research: civil engineering, architecture and urbanism
Laboratory Testing of Cement Grouting of Fractures in Welded Tuff
The objective of the investigation is to experimentally determine the effectiveness of fracture sealing in welded tuff using ordinary portland cement and microfine cement grouts. Laboratory experiments have been performed on seventeen tuff cylinders with three types of fractures: (1) tension induced cracks; (2) natural fractures; and (3) sawcuts. Prior to grouting, the hydraulic conductivity of the intact rock and of the fractures is measured under a range of normal stresses. The surface topography of the fracture is mapped, and the results are used to determine aperture distributions across the fractures. Grouts are injected through axial boreholes at pressures of 0.3 to 4.1 MPa while holding fractures under a constant normal stress. Five grout formulations have been tested. Posttest visual inspection of grout distribution confirms that permeability testing in an injection hole is not a reliable method to assess the effectiveness of grouting. Grout distribution is highly non-uniform.
Laboratory Testing of Cement Grouting of Fractures in Welded Tuff
The objective of the investigation is to experimentally determine the effectiveness of fracture sealing in welded tuff using ordinary portland cement and microfine cement grouts. Laboratory experiments have been performed on seventeen tuff cylinders with three types of fractures: (1) tension induced cracks; (2) natural fractures; and (3) sawcuts. Prior to grouting, the hydraulic conductivity of the intact rock and of the fractures is measured under a range of normal stresses. The surface topography of the fracture is mapped, and the results are used to determine aperture distributions across the fractures. Grouts are injected through axial boreholes at pressures of 0.3 to 4.1 MPa while holding fractures under a constant normal stress. Five grout formulations have been tested. Posttest visual inspection of grout distribution confirms that permeability testing in an injection hole is not a reliable method to assess the effectiveness of grouting. Grout distribution is highly non-uniform.
Laboratory Testing of Cement Grouting of Fractures in Welded Tuff
C. J. Sharpe (author) / J. J. Daemen (author)
1991
163 pages
Report
No indication
English
Radioactive Wastes & Radioactivity , Radiation Pollution & Control , Soil & Rock Mechanics , Construction Equipment, Materials, & Supplies , Portland cement , Grouting , Fractals , Tuff , Seals , Hydraulic conductivity , Measurement , Topography , Permeability , Bentonite , Tests , Welded tuff , Geologic repository
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