Applicability of Coal Combustion Products as Vertical Drain Method for Soft Ground Improvement

摘要

CCPs(Coal Combustion Products) mainly consist of fly ash and bottomrnash. In Korea, over 8 million tons of CCPs are generated by 11 coalrnfired power plants every year. Among them, 80% of fly ash has beenrnrecycled as a substitution of cement paste. Meanwhile, the rest fly ashesrnand bottom ashes are buried in landfill sites. As a result, it is veryrninteresting to reuse or recycle bottom ash based CCPs. Permeability ofrnCCPs which have relatively high volume ratio of bottom ashes arernhigher than that of clay, and also bottom ashes behave like sand in thernmechanical point of view. In this study, based on these properties, arnseries of composite discharge capacity tests were performed torninvestigate the applicability of CCPs to vertical drain method in the softrnground improvement. The results show that discharge capacities ofrnCCPs drain are not much different from sand drain or plastic boardrndrain. On the basis of the findings, it may be concluded that CCPs arernhighly applicable to the soft ground improvement.