Incorporation of organic liquid waste in alkali activated mixed fly ash/blast furnace slag/metakaolin-based geopolymers

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2024-09-22 DOI:10.1016/j.nucengdes.2024.113608

Sergey Sayenko , Yevhenii Svitlychnyi , Volodymyr Shkuropatenko , Federica Pancotti , Simona Sandalova , Arnaud Poulesquen , Isabelle Giboire , Abdelaziz Hasnaoui , Davide Cori , Gabriele Magugliani , Eros Mossini

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Abstract

The solidification of liquid oils (Shell Spirax and Nevastane EP 100) used as simulants of radioactive liquid organic waste (RLOW) in a specifically developed mix fly ash, blast furnace slag and metakaolin based geopolymer was studied in the present work. The process consists of obtaining the geopolymer paste slurry, produced by dispersing the solid precursors in the aqueous alkaline solution, and then adding RLOW via direct incorporation into the slurry under mixing to create an emulsion, before the geopolymer hardens. Geopolymer/oil composites have been prepared with various oil content (10, 20, 30 and 40 %v.), and subsequently characterized to verify their compliance with basic waste acceptance criteria. The positive role of the addition of a superplasticizer, to improve the fluidity of the paste, the density, and the homogeneity of the structure of geopolymer hardened materials was also demonstrated. The mechanical and engineering properties of the pastes and of solidified materials have been verified via rheological measurements and compressive strength tests. The optimized reference formulation loaded with 30 %v. oil waste has been tested in terms of raw materials variability and mixing proportion as part of a robustness study. Finally, the possibility to incorporate in the developed formulation other surrogated RLOW (tributyl phosphate/dodecane (30/70) and Liquid Scintillation Cocktail) has been studied with promising results.

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在碱活化混合粉煤灰/高炉矿渣/高岭土基土工聚合物中掺入有机液体废物

本研究对液体油（Shell Spirax 和 Nevastane EP 100）在专门开发的粉煤灰、高炉矿渣和偏高岭土基土工聚合物混合物中作为放射性液体有机废物（RLOW）模拟物的固化过程进行了研究。该工艺包括通过在碱性水溶液中分散固体前体来获得土工聚合物浆料，然后在土工聚合物硬化之前，通过搅拌将 RLOW 直接加入浆料中以形成乳液。已制备出不同含油量（10%、20%、30% 和 40%v.）的土工聚合物/油复合材料，随后对其进行了表征，以验证其是否符合基本的废物验收标准。此外，还证明了添加超塑化剂对改善糊状物的流动性、密度和土工聚合物硬化材料结构的均匀性所起的积极作用。通过流变学测量和抗压强度测试，验证了浆料和固化材料的机械和工程特性。作为稳健性研究的一部分，对含 30%v. 废油的优化参考配方进行了原材料变化和混合比例测试。最后，还研究了在所开发的配方中加入其他代用 RLOW（磷酸三丁酯/十二烷（30/70）和液体闪烁鸡尾酒）的可能性，结果令人鼓舞。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.