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The shrinkage of soils

Published online by Cambridge University Press:  27 March 2009

H. A. Tempany
H. A. Tempany
Affiliation:
Government Chemist and Superintendent of Agriculture for the Leeward Islands.
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Extract

1. By determination of the internal pore space in blocks of soils and comparison with the observed value for the linear shrinkage it is found that a linear relationship appears to exist between the two values.

2. By extrapolating the curve thus obtained an approximation for the limiting value of the shrinkage in the case of pure colloidal clay is arrived at amounting to approximately 23 per cent.

3. On this assumption it becomes possible to calculate the approximate content of colloidal material in any soil from a knowledge of the linear shrinkage.

4. Results are adduced, showing the values obtained for the shrinkage in the case of separated fine silt and clay fractions in the case of two soils of known shrinkage and physical composition, and compared with the values calculated from previous assumptions.

5. The results of the calculation of the content of colloidal clay in the foregoing manner in the case of 16 Leeward Islands soils are appended.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 8 , Issue 3 , June 1917 , pp. 312 - 330
Copyright
Copyright © Cambridge University Press 1917

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References

Page 314 note 1 For certain features in the apparatus the writer is indebted to the paper by Keen, B. A. on “The Evaporation of Water from Soil,” This Journal, 6, 456.Google Scholar

Page 316 note 1 In the event of it not being possible to complete a series of readings in one day it was found that by removing the dish containing the sulphuric acid the readings could be interrupted over night and resumed the next morning without seriously disturbing their continuity.