Abstract:

Using the compaction test, liquid-plastic limit combined device to Atterberg index, wax sealing method to dry density, gas meter to carbon dioxide and exchangeable sodium percentage test, as well as the composition and fabric of clay mineral, the physical and chemical actions of stabilized soil with cement-based soil stabilizer were researched. The experimental results show that the maximum dry density of the mixture increased and the optimum water content decreased as the dosages increased. After curing the mixture of stabilized soil, the plasticity index reduced, the dry density enhanced, the carbonate content increased, and the exchangeable sodium percentage raised. The clay mineral was activated to become all kinds of silicate and aluminate under the condition of stronger pH value and calcium ion. The study indicates that the mixture has gradually formed the more compact monolith in the system of soil and soil stabilizer and water and gas, through the transformation from liquid and gas to the solid, as well as the effect of fill, pack and cementation. The cation exchange has the minus effect in the later stage on the stabilized soil. The aluminosilicate clay mineral has been divided to take part in the action of the silicate and aluminate under the condition of the stronger pH value and calcium ion.

Key words: cement-based soil stabilizer, mechanism of stabilized soil, physicochemical action