Environmental impact and mechanical behavior study of experimental road made with river sediments: recycling of river sediments in road construction

摘要

Dredging operations are necessary to maintain harbour activities, to prevent floods, and to restore ecosystem. These sediments after dredging are considered as waste, and their management is a complex problem. In the context of sustainable development, traditional solutions, such as dumping, will be more and more regulated. More than ever with the shortage of aggregates from quarries, dredged sediment could constitute a new granular material source for Civil Engineering domain. The principal objective of this works is to use dredged river sediments in the road construction. This study consists to determine the physical-chemical, geotechnical, and environmental impact characteristics of raw river sediments. To improve the mechanical performance of this river material be used in road construction, a treatment by the hydraulic binder in combination with granular corrector has been proposed. The impacts of the treated material on the environment have been evaluated. The last part of this study focuses on the realization of an experimental road with the designed mixes in the laboratory. The validation of mechanical characteristics and the study of the environmental impacts have been made on core samples from the experimental road. The monitoring of the quality of the percolating water and runoff water has been explored. The obtained results in laboratory and in situ are promising for potential use of river sediments in foundation layer of the road construction.