PERMEABILITY AND CONSOLIDATION PROPERTIES OF CEMENT-TREATED CLAY IN TERMS OF EXCHANGEABLE CATIONS

Abstract

 This paper presents consolidation property of three cement-treated marine clays through constant strain rate consolidation test. In addition, chemical properties such as exchangeable cations (Ca²⁺, Mg²⁺, K⁺. Na⁺) and cation exchange capacities of them were investigated to evaluate permeabilities by Komine and Ogata’s method (2008). Following conclusions were obtained from this study. 1) Permeability of cementtreated clays on were 2.98 ~ 4.26 times higher than untreated clays by their solidification effect and exchange of exchangeable cations between Ca²⁺ and Mg²⁺. 2) Permeability of untreated clay were well corresponded to estimated values of Komine and Ogata’s method. They showed 0.65 ~ 1.96 times as much of experimental values on average. However, estimated permeabilities of cement-treated clays were 3.50 ~ 8.51 times higher estimated than obtained values when consolidation pressure approached to 5000 kPa. It can be assumed that estimated component of exchange capacity of Ca²⁺ were higher than the actual values without considering solidification of cement.