Experimental investigation of alkali-activated GGBS stabilization of dredged marine deposits: mechanical performance and decarbonization
アルカリ活性化GGBSによる浚渫海洋堆積物の安定化に関する実験的研究：力学性能と脱炭素化 (AI 翻訳)
Sijun Zeng, Ning Ma, Clarence Edward Choi
🤖 gxceed AI 要約
日本語
アルカリ活性化高炉スラグ（AAS）を用いて香港の浚渫海洋堆積物（MD）を安定化する手法を検討。水結合材比4の条件下で、AAS処理MDは普通ポルトランドセメント（OPC）処理の4.5倍の28日強度を示した。ライフサイクルアセスメントにより、AASはOPCと比較して炭素排出量を93%削減、コストを77%削減することを実証。強度単位あたりの環境・経済メリットもAASが優れる。
English
This study investigates alkali-activated ground granulated blast furnace slag (AAS) for stabilizing Hong Kong Marine Deposits (MD). At a water-to-binder ratio of 4, AAS-stabilized MD achieves 4.5 times higher 28-day strength than ordinary Portland cement (OPC)-stabilized MD. Cradle-to-gate LCA shows AAS reduces carbon footprint by up to 93% and cost by 77% compared to OPC, with superior environmental and economic benefits per unit strength.
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
日本でも浚渫土の有効利用と建設分野の脱炭素が課題。AASはセメント代替としてCO2削減に貢献し、日本のカーボンニュートラル目標に合致。コスト削減効果も示され、現場適用可能性が高い。
In the global GX context
Global construction seeks low-carbon binders; this study provides clear quantitative evidence (93% CO2 reduction, 77% cost saving) that alkali-activated slag can replace cement for marine deposit stabilization. Relevant for ISSB/TCFD disclosure of embodied carbon.
👥 読者別の含意
🔬研究者:Insights into AAS hydration mechanisms and strength development at various water-to-binder ratios, with implications for binder design.
🏢実務担当者:Quantitative data on strength, carbon reduction, and cost savings for selecting AAS over OPC in dredged material stabilization.
🏛政策担当者:Evidence supporting regulatory incentives for alternative binders in construction to reduce embodied carbon.
📄 Abstract（原文）
Abstract The use of alkali-activated ground granulated blast furnace slag (AAS) for stabilizing dredged Hong Kong Marine Deposits (MD) offers an innovative solution to address fill material scarcity and disposal challenges. Due to the distinct hydration mechanisms of AAS compared to ordinary Portland cement (OPC), it is essential to investigate how the water binder ratio ( w / b ) influences the strength development, physicochemical behavior, and environmental and economic performance of AAS-stabilized marine deposits. In this paper, MD stabilized with AAS and OPC across varying w / b (i.e., 2–16) is investigated. The results show that at w / b of four, AAS-stabilized MD achieves 28-day strength up to 4.5 times higher than OPC-stabilized MD, demonstrating superior stabilization efficiency. Early strength development (i.e., 7 days) is hindered by high w / b because high water content dilutes and limits GGBS hydration. Alkali concentration is introduced as a key parameter for predicting AAS-MD strength evolution. Phase assemblage analysis reveals that the strength gains in AAS-stabilized MD are primarily attributed to the formation of a dense network of clay mineral particles (e.g., kaolinite and montmorillonite) interwoven with hydration products such as Friedel’s salt, ettringite, and C–(A)–S–H. Cradle-to-gate life cycle assessment (LCA) and economic analysis reveal that substituting OPC with AAS reduces carbon footprint by up to 93% and achieves 77% cost savings. Per unit strength, AAS exhibits superior environmental and economic benefits. This study provides practical insights into the selection of binders, highlighting the importance of matching binder strength ranges to project requirements.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1007/s11440-026-03006-5first seen 2026-06-16 05:24:45
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