Abstract
Stabilization of soft clay soils is one of the most important and difficult problems in soil engineering, so that many methods have been recently developed in Japan. In this paper, a new stabilization method of soft clay soils using multivalent cations is introduced. Trivalent cations, e.g. Fe3+ and A13+ are selected, and their reactions with clay particles are investigated. The principle is a hardening of clay particles due to the cation exchange effect and the physical adsorption of oxides. Regarding engineering properties of the treated samples, the shearing strength sharply increased and low compressibility was obtained. The beneficial effects of this treatment are clarified not only for engineering properties but also for microscopic mechanisms (ionization process and aggregating phenomenon). The improved properties of soft clays are sufficient to be applicable to real construction projects. (TRRL)
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