Abstract
Soils dredged from the farm ponds to improve the water quality and the efficiency of storage of reservoirs cannot easily be dealt with or transferred to be reused because of high water content. In this paper, a series of laboratory experiments is carried out to examine a solidification procedure of such soil based on the biochemical grouting technique, e.g., the biogrout, instead of existing procedure using chemical solidification mixture which fills the fissure and the pore in soil using microorganic metabolism with colloidal silica. It is revealed from the test tube experiments that a set of 5ml of colloidal Silica, 1.25g of yeast and 0.3g of glucose is effective in dealing with 5g of dredged soil. Existing microorganism and organic nourishment source nutrition involved dredged soil is applicable to the biochemical reaction through the examination of the compounding ratio of the biochemical grout to the dredged soil, and the amount of dredged soil to be necessary for solidification within the biochemical grout processing. It is also found that the biogrout declines the plastic index of dredged soil and solidify the soil by comparing the penetration of the fall cone test before and after the biochemical grout processing under the same water contents.
