Black cotton soils are one of those clays with a high content of montmorillenite. These have a very high plasticity leading to high rates of expansion on wetting followed by shrinkage and considerable cracking on drying. The black cotton soils of Ethiopia have liquid limits ranging between 80 and 120 and plasticity indices of 40 to 80 (see figure l). The activity of these clays is between 0.8 and 1.5. Thus by the Skempton classification the activity of these clays is considerable and, as one would expect, swelling potential is high.
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Library ResourceReports & ResearchApril, 1973Africa
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Library ResourceJournal Articles & BooksApril, 1973
The modified input-output multiplier is proposed. Some limitations of the multiplier and the results of its application to four major land use industries are discussed.
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