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This article in SSSAJ

  1. Vol. 35 No. 5, p. 834-838
    Received: Feb 9, 1971
    Accepted: Mar 23, 1971

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Modification of Certain Soils by Calcium Hydroxide Stabilization1

  1. D. E. Pettry and
  2. C. I. Rich2



Physical changes induced by prolonged Ca(OH)2-treatment were determined for natural peds from specific horizons of Beaumont, Hiwassee, Houston Black, Katy, and Nacogdoches soils. Confined swelling pressures, liquid limits, and plasticity indexes decreased substantially for soil peds treated with 5% Ca(OH)2 for 60 days in a humid atmosphere. Calcium carbonate appeared to be the dominant soil—Ca(OH)2 reaction product.

Treatment with 5% Ca(OH)2 (weight basis) drastically reduced the intensity of the characteristic X-ray reflections of phyllosilicates. However, washing the treated clays with 1N HCl restored the intensity of reflections to the approximate original intensity; thus the crystallinity of the phyllosilicates remaining after Ca(OH)2-treatment remained intact. X-ray diffraction studies indicated a reduction in interlayer expansion of Casaturated 2:1 expansible layer clay fractions after a 30 min treatment with 5% Ca(OH)2 at 100% relative humidity.

Microscopic examinations of whole soil peds and thin sections of peds treated with Ca(OH)2 for 1 year revealed changes in the soil fabric. Intergranular bridges of reaction products were observed along pressure faces and channels. Interior walls of soil voids were lined with soil-Ca(OH)2 reaction products suggesting penetration in a liquid form.

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