Prevention of diffusion of alkaline components from chemically stabilized soil

It is considered that alkali components from chemically stabilized soil can affect the ecology of animal and plants in the long term. For prevention of diffusion of alkaline components the transport characteristics of alkaline components such as free calcium ion and hydroxide ion in soil is investigated by the application of the electrokinetic method. Silica sand filled a small rectangular box equipped with electrode plates and saturated by pure water. Calcium hydroxide solution was injected into the water at the same time as three kinds of electric current were applied to the sand. The concentration of calcium ions and pH value in the water and the sand was measured. Results of the study are as followings; 1) under direct current, free calcium and hydroxide ions are easily transferred, 2) superimposed current is useful for transportation of these ions in soil, 3) full-wave rectified current with high frequency is also effective for movement of the ions, 4) a phenomenon whereby calcium ion are adsorbed onto the sand surface was found. Therefore, a possibility of preventing diffusion of alkaline components by electrokinetic methods is clearly demonstrated.

• 1 INTRODUCTION

• 2 EXPERIMENTAL CONDITIONS AND PROCEDURE

• 3 EXPERIMENTAL RESULTS AND DISCUSSION

• 4 CONCLUSIONS

• 5 ACKNOWLEDGEMENTS

• 6 REFERENCES