Abstract
A large amount of sediment is dredged in France every year. Due to the increase of the amount of marine dredged sediments, environmentally reuse of dredged sediment is urgently needed in France. The first objective of this study is to find an application for reuse of marine dredged sediments materials, as new material for road construction. Hence, serial tests need to be realized to identify if marine dredged sediment could be utilized for road construction. The second goal is to enhance the physical, mechanical and chemical characteristics of the mix, by incorporating binders and sediments, and revealed the identification of the mechanical characteristics measured on the mixes is compatible with their use as a base course material. The results show that the treatment by hydraulics binders could satisfy the needed mechanical characteristics. The present of Silica Fume is aimed to reduce the pollution level, especially the heavy metal content. However, the proportion of hydraulics binders and silica fume needed to meet prescribed specification is important, so the reuse of the marine dredged sediments of Port-en-Bessin, France in road construction, as an alternative material could be achieved. After the geotechnical study in laboratory results shown as expected than the study to identify the chemical characteristic realized. To evaluate the environmental impacts of the used material, leaching test is 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.
Highlights
In France, the Port Authority is encouraged to find the application domain for the reuse of dredged sediments
Samples with Silica Fume type 1 (SF1) and Silica Fume type 2 (SF2)addition were set in order to investigate the influence of the Silica Fume on the strength gained, the mixtures wererealized with various percentage of Silica Fume content
The leaching test result state that dredged sediment of Port en Bessin content amount of pollutants is categorized as nonhazardous waste.Test on tensile strength confirmed that the sample with addition 7% Silica fume could to be used as material in sub base and foundation
Summary
In France, the Port Authority is encouraged to find the application domain for the reuse of dredged sediments. Before deciding if the dredged material is acceptable for a beneficial use, it is necessary to be realized serial tests to evaluate the capability of marine dredged sediment in its utilization domain. Previous studies with different alternative treatment method to find the domain application for the reuse of marine dredged sediments have been investigated in Europe. The previous studies utilized Marine dredged sediment, Pempe Ozer-Erdogan et al [2]worked on marine dredged sediments in Turkey, Benyerou et al [3]utilized marine dredged sediments as a base material for produce the brick, Couvidat et al [4]worked with marine dredged sediment in Marocco, Hurel et al [5] and Levacher [6] stabilized marine dredged sediment in France.This paper concentrate to determine the type and composition of binder to stabilize marine dredged sediments.
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