Effect of Coal Ash Contents on the Acceleration of Settling and Self-Weight Consolidation of Clayey Ground

In Korea, reclaiming works have been performed in many coastal areas during last two decade. Most of these reclaiming works were performed with dredged material due to its economical benefits. However, frequent dredging and its reuse cause the exhaustion of near shore dredged material. Because of these reason, nowadays, long distance pumping and transfer of dredged material have to be considered. Long distance transfer is another branch of study, and this seems to be more expensive. For this reason, new interests concerning the development of alternative filling material arose. Studies for using many kind of recycled material such as wasted tire, wasted shell, wasted concrete, etc., as an alternative filling material had been performed. However most of these materials have to be experienced another manufacturing process, and also some of these materials have a small applicability because of its environmental hazard. In this paper, application of buried coal ashes as a land reclamation material was studied. Developing new material needs many geotechnical and environmental examination, such as settling and selfweigh-consolidation characteristics, shear strength characteristics and environmental problems, etc. As a first attempt, DAEWOO E&C in Korea started to study the applicability of buried coal ash mixture as an alternative filling material. As a result of the series of self-weighconsolidation tests, this paper briefly presents the basic geotechnical characteristics of these mixtures according to their mixture ratio, and also presents their improved effect comparing to dredging material without coal ash.