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Changes in Soil Compressibility Associated With Polyelectrolyte Treatment¹

ABSTRACT

A laboratory study was conducted to evaluate some effects of a 0.1% IBMA treatment on the compressibilities of Yolo silt loam and Columbia loam soils. Samples were compressed at moisture contents ranging from oven-dry to near moisture equivalent with pressures up to 50 psi. Due to their initially higher specific volume, treated soils were more compressible than checks. The IBMA-treated soils retained higher specific volumes after compression at each of the several moisture contents and at each pressure. Differences in specific volume between compressed treated and compressed untreated soils decreased as the moisture content at compression, or the pressure used for compression, increased.

¹ Joint contribution from Soil and Water Conservation Research Division, ARS, USDA and the California Agr. Exp. Sta. Presented before Div. I, Soil Science Society of America, Aug. 7, 1958, at Lafayette, Ind.

² Soil Scientist (Physics), Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, Southwestern Great Plains Field Station, Bushland, Tex., and Assistant Professor of Soil Physics, Department of Soils and Plant Nutrition, University of California, Davis.

Received for publication August 25, 1958. Accepted for publication February 20, 1959.