Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525603
Title The mechanical stability of clay soils as influenced by the moisture conditions and some other factors
Author(s) Koenigs, F.F.R.
Source University. Promotor(en): A.C. Schuffelen. - Wageningen : Pudoc - 172
Publication type Dissertation, internally prepared
Publication year 1961
Keyword(s) zware kleigronden - colloïdale eigenschappen - bodem - bodemkunde - bodemstructuur - rijst - oryza sativa - scheurvorming - opzwellen - krimp - bodemwatergehalte - clay soils - colloidal properties - soil - soil science - soil structure - rice - cracking - swelling - shrinkage - soil water content
Categories Soil Physics / Soil Science (General)
Abstract To test whether flocculation is a prerequisite for granulation and a waterstable structure or whether drying (close contact) is sufficient, homoionic suspensions were prepared from pure sodium, potassium, calcium or magnesium montmorillonite, illite or kaolinite and from the respective soil clays. Forms other than Na were prepared from Na suspensions without drying; the ultimate salt concentration was below flocculation value.

Suction-moisture curves were established and reswelling (pF 1 after positive pressure) was studied. Sodium clays except latosol swelled again completely after drying; potassium clays, except pure montmorillonite, swelled again completely up to high suctions; calcium and magnesium clays showed partial reswelling; latosol none, except with Na at high pH; pure illites swelled again but the soil clays behaved like soil montmorillonite. Inversion shaking was used to estimate the stability of granules formed by complete or partial water desorption. The stability of calcium and magnesium clays, and soil clays depended slightly on salt concentration; with Na or K, stability depended strongly on salt concentration, except in potassium illite soil clay; stability of all latosols decreased with salt concentration. The stability test was also employed to estimate the destruction caused by working the soil at different water contents. The phenomena observed could be explained by MADELUNG forces between parallel planes of clay minerals at short distance and by edge to plane attraction.

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