Immobilisation of decontamination sludge in low-carbon cement: a study of early-age physico-mechanical behaviour of two alkali-activated slag-based waste forms
低炭素セメントにおける除染スラッジの固定化：2種類のアルカリ活性化スラグ系廃棄体の初期物理機械的挙動の研究 (AI 翻訳)
M. Criado, Javier Puentes, Elena Torres, Laura Ramallo, J. Juan Ruiz, Alicia Pachón
🤖 gxceed AI 要約
日本語
本研究は、除染スラッジの固定化にアルカリ活性化スラグセメントを用いる技術的実現可能性を評価した。炭酸ナトリウム活性化スラグは、より早い硬化、高密度化、低透湿性を示し、外部環境への耐性に優れることが分かった。最大8.8%の乾燥スラッジを固定化可能である。
English
This study evaluates the feasibility of using alkali-activated slag cements to immobilize decontamination sludge from nuclear decommissioning. Sodium carbonate-activated slag showed earlier hardening, higher compaction, and lower vapor permeability, indicating superior resistance. Up to 8.8% dry sludge by binder weight can be immobilized.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本でも原子力発電所の廃止措置に伴う放射性廃棄物処理は重要課題である。低炭素セメントを用いた固定化技術は、環境負荷低減と廃棄物処理の両面で関心を集める。
In the global GX context
The study addresses immobilization of radioactive waste using low-carbon cement, relevant to global nuclear decommissioning and sustainable construction materials. It provides insights into waste form performance for long-term disposal.
👥 読者別の含意
🔬研究者:Nuclear waste immobilization researchers can gain insights on alkali-activated slag performance for sludge containment.
🏢実務担当者:Waste treatment facilities may consider these binders for improving waste form stability.
🏛政策担当者:Regulators overseeing nuclear decommissioning waste disposal should note the potential of low-carbon cement matrices.
📄 Abstract（原文）
Decommissioning activities generate large volumes of low- and intermediate-level radioactive waste (LILW) that require suitable disposal routes. Although immobilisation in Portland cement matrices is the standard conditioning method, certain wastes with an acidic nature, with high contents of chelating agents and/or surfactants, such as the effluents resulting from metal surface decontamination processes, present serious disadvantages for their direct conditioning in these matrices. This study evaluated the technical feasibility of slag cements activated with sodium carbonate and sodium silicate as confinement matrices for decontamination sludges. First, the maximum immobilisable waste loading was determined according to the Spanish mechanical acceptance criterion. Subsequently, the early-age transition from plastic to pseudo-rigid microstructure was analysed for both alkali-activated cements. To optimise waste loading, sludge was incorporated in liquid and solid states with liquid/solid ratios of 0.45, 0.50, and 0.55. Fresh properties, mechanical strength, and total porosity were assessed. The alkali-activated slag matrices enabled immobilisation of up to 8.8% dry sludge by binder weight. Microstructural evolution was studied using induction calorimetry, ultrasound pulse velocity, capillary pressure, and water vapour diffusion. Sodium carbonate-activated slag exhibited earlier hardening, higher compaction, lower vapour permeability, and greater tortuosity, indicating superior resistance to external agents.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.net.2026.104562first seen 2026-07-13 05:55:07
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