American Society of Civil Engineers


Densification of Dewatered Sludge by Compaction after Crushing and Air-Mixing


by Masaki Nakano, M.ASCE, (Associate Professor, Department of Civil Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan E-mail: nakano@civil.nagoya-u.ac.jp), Kentaro Nakai, (Assistant Professor, Department of Civil Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan), and Kazuhiro Kaneda, M.ASCE, (Researcher, Port and Airport Research Institute, 3-1-1 Nagase, Yokosuka, Kanagawa 293-0826, Japan)

pp. 189-200, (doi:  http://dx.doi.org/10.1061/40870(216)15)

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Document type: Conference Proceeding Paper
Part of: Geomechanics II: Testing, Modeling, and Simulation
Abstract: The densification of clay is provided by large applied loading with long consolidation time, and therefore clay is referred to as a ‘consolidation material.’ On the other hand, sand is easy to be packed by small cyclic loading with short time, and therefore sand is referred to as a ‘compactable material.’ In the present study, a densification technology of soil with high water content such as dewatered sludge is studied. The densification is provided by the change from the ‘consolidation material’ like clay to the ‘compactable material’ like sand. The soil is crushed and mixed with air to an assembly of "clay pebbles." The water content of each "clay pebble" is easy to decrease, and therefore the assembly can be compacted to high density without long consolidation time. The soil exhibited low compressibility and had high shear resistance, which is similar to a heavily overconsolidated soil. The compaction behavior, as well as the behavior after compaction can be described by Super/subloading Yield Surface model.


ASCE Subject Headings:
Densification
Dewatering
Sludge
Soil compaction
Mixing