Potential reuse of fine sediment from hydroelectric dams and recycled concrete sand in road subgrades  

作　　者：Hamza Beddaa Saannibe Ciryle Somé Amor Ben Fraj Coryse Coudray Emmanuel Branche Amaury Cudeville 

机构地区：[1]Cerema,Univ Gustave Eiffel,UMR MCD,Sourdun F-77171,France [2]EDF(Électricitéde France),Lab Les Renardières,Moret-sur-Loing F-77818,France [3]EDF(Électricitéde France),Savoie Technolac,Le Bourget-du-Lac Cedex 73373,France [4]Clamens,Rue des Carrières Z.I.SUD,Villeparisis 77270,France

出　　处：《International Journal of Sediment Research》2024年第6期971-983,共13页国际泥沙研究(英文版)

摘　　要：Hydroelectric dams play a crucial role in power generation,water storage,and irrigation.However,their continuous operation has led to sediment accumulation,thereby reducing the water storage capacity and impacting the facility's life span.The aim of the current study is to assess the reuse potential of dredged fine sediment in the composition of road subgrades.Nine types of sediment from diverse hydroelectric dams are analyzed for their chemical,environmental,physical,and geotechnical properties.These sediments then were treated with quicklime and a slag-based hydraulic road binder(3%and 6%,respectively).The current investigation involves evaluating:Proctor parameters,the immediate bearing index,treatment ability,and the mechanical properties of the treated sediment.The results reveal that the properties of treated sediment differ from one mixture to another,thus,indicating that some mixtures meet the criteria outlined in the French Roadworks Guide,by virtue of their clay and organic matter contents.Moreover,the current study explores the impact of incorporating recycled concrete sand(RCS)as a granular corrector to enhance the reuse potential of the sediment in road subgrades.The current findings indicate that adding RCS significantly improves mixture properties,particularly mechanical characteristics,by reaching 1 MPa before 7 days of curing.These promising outcomes pave the way for more advanced road construction practices in ensuring environmental compliance and promoting an eco-friendly reuse of sediment.

关 键 词：SEDIMENT Recycled concrete Road subgrade Mechanical properties Treatment ability 

分 类 号：TQ177[化学工程—硅酸盐工业]