Abstract
Dispersive soils are very abundant around the world; upon contact with water, the clay minerals in dispersive soils become strongly repulsed by each other and remain suspended apart from each other, a dangerous trend which has led to a number of irreparable damages. The soil used in this test was completely virgin and could be classified as a dispersive soil. In the first section of this study, the pinhole test was conducted on more than 20 selected additives; the results of these tests demonstrated that the best amending agents were calcium oxide and calcium hydroxide salts, in addition to polymer and cement compounds. A closer examination of the results obtained from the pinhole test for the six ideal additives, used at different percentages, revealed that even low percentages of lime, cement, and calcium hydroxide would dramatically reduce soil dispersivity. The combined effect of lime compounds with any of the (high pH) additives, including aluminum sulfate, pozzolan, and sulfur, at identical ratios represents their cumulative effect on the amendment intensity. The second section simultaneously explores the effects of several physical parameters of the amended soil including density, moisture, and time, through the test design method. The results obtained from this phase suggested that both increasing soil density and time would effectively amend the soil if used within their respective ranges, the former directly and the latter to a certain extent.
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Shoghi, H., Ghazavi, M. & Ganjian, N. The effects of chemical admixtures and physical factors on the treatment of dispersive soils. Arab J Geosci 10, 486 (2017). https://doi.org/10.1007/s12517-017-3263-y
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DOI: https://doi.org/10.1007/s12517-017-3263-y