The objective of this work was to evaluate the suitability of dredged sediments treated with pozzolanic binders as a pavement base material, and to assess the usefulness of fly ash as a soil mixture/binder with the aim of improving the engineering properties of the stabilized dredged sediments in order to make them capable of taking more load from the foundation structures. Comparing the results with other binders currently used in road construction, the addition of fly ash shows significant positive advantages. The present study covers the characterization of the dredged sediments and fly ash, compaction behaviour, pH measurement, effect on unconfined compressive strength, and the effect of cyclic wet-dry and freeze-thaw tests.
International audienceDisposal of large sediment from dredging activities is increasingly intractable problem in France. The reuse of dredged sediment as a new material for the construction of foundation and base layers for roads is one of the solution. The main objective of this paper is to describe the behavioral aspect of dredged sediment stabilized with fly ash as a binder for a use in road pavement work. The addition of fly ash as a partial cement replacement is realized due to its engineering, economic and ecological benefits. The first stage contains a determination of the physical and mechanical characteristics of the fly ash and the dredged sediments. In the next stage, the dredged sediment from harbor of Cherbourg has been considered using 2 different types of fly ash and different percentage of fly ash ranging from 5 to 30% by weight of sediment. Finally, the mechanical characteristics of the mix with fly ash addition are compared with the mix with conventional used binders (cement).The experimental results show that the addition of fly ash gives a positive influence on the strength gained of the sample
Abstract. In order to maintain the harbour activities, big amount of sediments are dredged every year. The traditional solution such as dumping the dredged sediments to the sea/river since its regulated in Europe, is not an option anymore. Therefore the beneficial reuse of polluted marine dredged sediments is urgently needed to realize. This study focused on reuse the dredged sediment in road construction. The main objective of this research is to enhance the physical, mechanical and chemical characteristics of the mix by incorporating binders sediments to fulfil the criteria in their use as material in road construction. The results show that the treatment by hydraulics binders and silica fume could satisfy the needed mechanical characteristics. The main reason of Silica Fume addition is its capability to trap the pollutants so that the pollutants could not escape from the matrix and pollute the environment. After the geotechnical study in laboratory results show as expected, then the study to identify the chemical characteristic realized. To evaluate the environmental impacts of the use material, leaching test are performed. The leaching test was performed to verify the predicted release of pollutants based on total dissolution. And for the final part, the test results show that the polluted marine dredged sediments could be safely used (in term of environmental impact) as a new material in road construction.
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