Geotechnical properties of paper mill sludges for use in landfill covers

Article Abstract:

Orlando Andersland's claim that the shear strength may gradually decline with time, thereby causing problems when employing paper mill sludges as landfill cover, is incorrect. However, actual experience has shown that shear strength improves with time. Robert Day doubts the accuracy of the test results on specific gravity, Proctor compaction tests, settlement data and shear strength parameters. However, the test data are reproducible even though the values are not appropriate for design use because the sludge properties can vary considerably.

Usage, Shear strength of soils, Soil shear strength

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Forced vibration of full-scale wall backfill system

Article Abstract:

A study on the forced vibration of a wall backfill system is evaluated. It is argued that displacement is the most important consideration for cantilever retaining walls during earthquakes while questions were posed to the study's authors such as whether the results can be used to determine the behavior of a catilever retaining wall in a high intensity earthquake. The modal damping value presented by the study is also believed to be too conservative.

Earthquake engineering, Retaining walls

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Geotechnical properties of paper mill sludges for use in landfill covers

Article Abstract:

A study on the geotechnical properties of seven paper mill sludges to be used in landfill covers is evaluated. It is argued that the authors failed to provide data on the size and quantity of fibers in the sludge samples. Questions were also raised on the decomposition and long-term behavior of the sludges in landfill covers. The impact of organic content on undrained vane shear strength at various consolidation pressures is discussed.

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