EXPERIMENTAL STUDY ON PHYSICAL AND MECHANICAL PROPERTIES OF DREDGED MARINE SEDIMENT FOR VALORISATION IN ROAD ENGINEERING
Purpose: In Europe, huge amounts of sediments are dredged each year to maintain various navigation canals, rivers and harbours activities. With the enhanced awareness of marine environmental protection and the growing shortage of civil engineering materials, the management of marine sediments thus becomes to be a burning scientific problem to solve for better protection of aquatic environment. In this context, many policy makers and researchers focus more on the recovery and reuse of marine sediment. In order to take advantage of the dredged materials and to minimize the environmental pollution created by the traditional disposal method, the physical and mechanical properties of dredged materials were indispensably studied. Methods: For the determination of the clay and sand and silt proportions, the grain size distribution of sediment is performed by a laser diffraction technique. The specific gravity and the organic matter content are measured according to the different methods. Thermal stability and weight change of the material as a function of temperature and time has been analyzed by thermo-gravimetric analysis. The liquid and plastic limit could be explored by the Casagrande method and the hand rolling method. By means of modified Proctor tests, the IPI index can be measured after the compaction test. The tensile strength and the compressive strength are obtained respectively by the diametrical compression test and the uniaxial compression test. Finally, direct shear test are performed to measure the cohesion and internal friction angle. Results: The main physical characterization of the dredged sediments was studied, such as the water content, the specific gravity, the organic matter content, the liquid limit and plastic limit. Apart from this, the IPI index, the tensile strength, the compressive strength and the shear strength parameters have been researched for evaluating its valorisation in road engineering. Main conclusions: On the basis of this study, we can clearly recognize that and a lot of useful results could serve as a guide for the recycle and the reutilization of marine sediments as a building material, but the raw dredged sediment without treatment cant be directly applied to the road engineering.
dredged marine sediment physical property mechanical property road engineering
Dongxing Wang Rachid Zentar Nor Edine Abriak Weiya Xu
Université Lille Nord de France, F-59500, Lille, France Ecole des Mines de Douai, MPE-GCE, F-59500 D Université Lille Nord de France, F-59500, Lille, France Ecole des Mines de Douai, MPE-GCE, F-59500 D Hohai University, Institute of Civil Engineering, 210098 Nanjing, China
国际会议
北京
英文
41-46
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）