The plasticity of Georgia kaolin was studied to clarify the factors affecting the uniaxial compression behavior before and after ion-exchange in 1N CH3COONH4 solution. Georgia kaolin, a kaolinitic clay, showed a very small amount of dissolution of divalent cations and a similar zeta-potential change before and after the ion-exchange. According to an analysis of the uniaxial compression test, the plasticity degraded at pH 7, however, improved at pH 4.9. It was found that the plasticity was more affected by the pH and zeta-potential value than by the adsorbed ions.
