Strength Properties of Soil Cement Produced by Deep Mixing
Publication: Grouting and Ground Treatment
Abstract
Among many soil mixing systems, the most common is the deep soil mixing system that uses cement slurry as an additive reagent. This is because, 1) relatively simple equipment is needed, 2) satisfactory mixing is achievable, and 3) quality control is not difficult. At the present time, however, strength properties of soil cement produced by deep mixing are not well understood. For example, their relationship with mixing methods is not well established nor is the concept of uniformity of soil cement. Strength test data of soil cement cores from two project sites were obtained with cooperation from the project owners and specialty contractors. The projects involved two deep mixing systems using cement slurry; the multi-shaft CDM (Cement Deep Mixing) and the single-shaft SBM (Shear Blade Mixing) systems. The first project is the soil improvement at Berths 55/56 at the Port of Oakland in California, which used the Cement Deep Mixing system. The second project is the foundation soil improvement of a six-story commercial building in Niigata, Japan, which used the SBM system. For these projects, many core samples of soil cement were obtained for quality control. The subject of this paper is statistical analyses of the strength test data of the core samples. Histograms were used to analyze the strength distributions. A method to determine the design strength is presented which utilizes the standard deviation and the coefficient of variation of the strength test data.
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Copyright
© 2003 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Cement
- Concrete
- Construction engineering
- Construction management
- Engineering materials (by type)
- Foundation construction
- Foundations
- Geomechanics
- Geotechnical engineering
- Material mechanics
- Material properties
- Materials engineering
- Materials processing
- Project management
- Soil cement
- Soil mechanics
- Soil mixing
- Soil properties
- Soil strength
- Strength of materials
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