| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 107 === A comprehensive improvement can be reached by utilizing the injection of deionized water incorporated with other chemicals, such as CaCl2, KOH and sodium silicate (also known as water glass) solutions as reported in recent years. Additional injection of deionized water is found to be capable of altering the physicochemical behaviors of treated soil. The improved area is consequently broadened across the whole soil sample rather than limited in the vicinity of the electrodes. A series of tests divided into 3 phases, which aimed to clarify the changes in the physicochemical behaviors with/without the use of deionized water injection, including (1) injection of CaCl2 for a constant duration followed by pure electric field; (2) injection of CaCl2 for a constant duration followed by injection of deionized water; (3) sole injection of deionized water, which also serves as the extension of the tests reported previously for a constant duration. Result shows that deionized water injection is able to dramatically enhance the mobility of calcium ions as well as silicic acid ions. Hence, the silica gel is able to form under intensive condensation reaction at the vicinity of cathode with a great number of silicic acid anions present. Additionally, the injection of deionized water causes the redistribution of pH throughout the soil sample due to its low viscosity when incorporates with highly alkaline solution, a highly alkaline condition, therefore, is created which in turn favors the pozzolanic reaction.
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