Chapter
Apr 26, 2012
Alternative Laboratory Technique to Monitor the Effect of Cementing Additives on Clay for Cut-Off Walls
Publication: Geo-Frontiers 2011: Advances in Geotechnical Engineering
Abstract
Low permeability cut-off walls are regularly employed for groundwater and pollution control. In Europe, they are usually built out of cement-bentonite slurries. Generally, bentonite-cement slurries are studied in the laboratory to evaluate its strength, hydraulic conductivity and chemical compatibility. In this study, a nondestructive technique is proposed as an alternative method to monitor the hardening of clay treated with cementing additives. The technique makes use of bender elements to measure the shear wave velocity and the small-strain shear modulus (G0). Bender elements were installed in a flexible-wall hydraulic conductivity cell, so that G0 as well as the hydraulic conductivity of a single sample could be monitored versus time. Experimental work was carried out on cemented kaolin clay using Portland cement. Monitoring of G0 was shown to provide valuable additional information to study the stiffening of cemented clay.
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Copyright
© 2011 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Cement
- Chemical additives
- Chemicals
- Chemistry
- Clays
- Concrete
- Core walls
- Diaphragm walls
- Engineering materials (by type)
- Environmental engineering
- Geomechanics
- Geotechnical engineering
- Materials engineering
- Permeability (soil)
- Pollution
- Soil cement
- Soil mechanics
- Soil pollution
- Soil properties
- Soils (by type)
- Structural engineering
- Structural members
- Structural systems
- Walls
Authors
Affiliations
Laboratory of Geotechnics, Department of Civil Engineering, Ghent University. Technologiepark 905, B-9052 Zwijnaarde, Belgium.E-mail: [email protected]
G. Di Emidio
Laboratory of Geotechnics, Department of Civil Engineering, Ghent University. Technologiepark 905, B-9052 Zwijnaarde, Belgium.
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