JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.37, no.1, pp.219-228, 2022 (SCI-Expanded)
Dredging is the removal of the sediments from the underwater for maintenance and construction purposes. The volume of dredging operations increase each year because of growing population and world trade and disposal of dredged material (marine sediment) becomes worldwide problem due to hazardous impacts of dredged material disposal at sea and land. The alternative usages of dredged material have gained importance and they have begun to be considered as a new resource for construction and environmental projects. The overall objective of this study is examining the potential usage of dredged materail which is stabilized with lime/cement, for road construction. The unconfined compression tests were performed on the untreated and lime/cement treated samples, which were prepared at optimum moisture content. The effect of lime/cement stabilization on unconfined compression strength is shown in Figure A. Figure A. The effect of lime stabilization on unconfined compression strength (a) Lime (b) Cement Purpose: The main aim of this study is to investigate the potential reuse of dredged material for road construction purpose. Theory and Methods: In this study, the laboratory tests were performed on raw sediment and sediment mixed with different percentage of lime and cement content to assess the impact of lime/cement treatment on the engineering properties of dredged material and suitability of dredged material for road construction purposes. Atterberg limit tests, miniature compaction test and unconfined compression test was performed on raw and lime/cement treated dredged material. The samples were cured for 1 day,7 and 28 days for unconfined compression test. Results: The test results show that the plastic limit of treated samples increases with addition lime/cement when their plasticity index decreased. The unconfined compressive strengths of the mixtures showed significant increases depending on the increasing additive content and curing time. The maximum 7-day unconfined compressive strength values were achieved by 4% lime 15% cement content. Conclusion: The optimum binder contents are 4% an %15 of the dry weight of dredged material for lime and cement, respectively. As shown in the experiments, the engineering properties of dredged material can be improved by using additives and reused as subbase layer of road.