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

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research Pub Date : 2024-09-26 DOI:10.1016/j.ijsrc.2024.09.004

Hamza Beddaa , Saannibe Ciryle Somé , Amor Ben Fraj , Coryse Coudray , Emmanuel Branche , Amaury Cudeville

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引用次数: 0

Abstract

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.

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水电站大坝产生的细沉积物和路基中的再生混凝土砂的再利用潜力

水电站大坝在发电、蓄水和灌溉方面发挥着至关重要的作用。然而，水电站的持续运行导致泥沙淤积，从而降低了蓄水能力，影响了设施的使用寿命。当前研究的目的是评估疏浚的细沉积物在路基成分中的再利用潜力。研究人员对来自不同水电站大坝的九种沉积物进行了化学、环境、物理和岩土特性分析。然后用生石灰和矿渣水工路面粘结剂（分别为 3% 和 6%）对这些沉积物进行处理。目前的调查包括评估Proctor 参数、即时承载指数、处理能力以及经处理沉积物的机械特性。结果表明，不同混合物的处理后沉积物性能各不相同，因此，一些混合物因其粘土和有机物含量而符合《法国道路工程指南》中规定的标准。此外，当前的研究还探讨了加入再生混凝土砂（RCS）作为颗粒修正剂的影响，以提高沉积物在路基中的再利用潜力。目前的研究结果表明，添加 RCS 可明显改善混合物的性能，尤其是机械特性，在 7 天的养护前就能达到 1 兆帕。这些可喜的成果为更先进的道路建设实践铺平了道路，以确保符合环保要求并促进沉积物的环保再利用。

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来源期刊

International Journal of Sediment Research 环境科学-环境科学

CiteScore

6.90

自引率

5.60%

发文量

审稿时长

74 days

期刊介绍： International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.