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低炭素建設に向けた耐久性志向のアルカリ活性化モルタル設計：単一・二成分・三成分前駆体の組み合わせ

Durability-Oriented Design of Alkali-Activated Mortars for Low-Carbon Construction: Single, Binary, and Ternary Precursor Combinations (原題)

Ramazan Demirboğa, Cemal Karaaslan, Khatib Zada Farhan

Buildings📚 査読済 / ジャーナル2026-10-29#その他Origin: Global経営インパクト: 調達リスク対象セクター: construction
DOI: 10.3390/buildings16214322
原典: https://doi.org/10.3390/buildings16214322

🤖 gxceed AI 要約

日本語

フライアッシュ、高炉スラグ微粉末、メタカオリンを単一・二成分・三成分で組み合わせた7種のアルカリ活性化モルタルを同一のワーカビリティ条件下で比較した研究。スラグ単独系が最も緻密で高強度（97MPa）となり、凍結融解後97%、酸曝露後78%の強度を保持した。耐久性はマトリクス密度とゲル化学の二つの要因で規定されることを示し、低炭素建設における前駆体選定の定量的根拠を提供する。

English

Seven alkali-activated mortars combining fly ash, GGBFS and metakaolin in single, binary and ternary blends were compared under a common workability constraint. The slag-only system was densest and strongest (97 MPa), retaining 97% strength after freeze–thaw and 78% after acid exposure. Durability is shown to be governed by two distinct controls—matrix density and gel chemistry—offering a quantitative basis for precursor selection in low-carbon construction.

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

建設分野の脱炭素はScope 3排出の大宗を占めるセメント・コンクリート由来排出の削減が鍵であり、本論文は低炭素結合材の耐久性実証データを提供する。日本企業のScope 3算定やグリーン調達基準の高度化に資する基礎的知見として位置づけられる。

In the global GX context

Cement and concrete are among the largest hard-to-abate emissions sources in corporate Scope 3 inventories, and durable low-carbon binders are central to credible construction decarbonization pathways. This comparative durability dataset supports material selection for lower-embodied-carbon construction under emerging disclosure regimes.

👥 読者別の含意

🔬研究者:アルカリ活性化材料の耐久性を前駆体組成とゲル化学の両面から比較した定量データとして参照できる。

🏢実務担当者:低炭素コンクリートの調達・仕様選定において、耐久性リスクを踏まえた結合材選定の参考になる。

📄 Abstract（原文）

The construction industry needs durable low-carbon binders whose engineering behaviour is reproducible across precursors, yet published comparisons of alkali-activated mortars rarely place single, binary and ternary systems side by side under the same workability constraint. This study tests seven mortars built from fly ash (FA), ground granulated blast furnace slag (GGBFS) and metakaolin (MK) in single, binary and ternary combinations, with the alkali activator-to-binder ratio adjusted between 0.40 and 1.00 to obtain a consistency suitable for mixing and casting, so that activator dose, water content and precursor composition are reported together. Water absorption, bulk density, sorptivity, compressive strength, residual strength after 25 freeze–thaw cycles and after 75 days in 5% sulfuric acid, and gel chemistry from scanning electron microscopy with energy-dispersive X-ray spectroscopy are reported. The slag mortar (U-S) formed the densest, strongest system (2.36% absorption, 2366.5 kg/m3, 97 MPa) and retained 97% of its strength after freeze–thaw cycling and 78% after acid exposure. Fly ash alone (U-F) retained about 63% of its strength under acid attack, second only to U-S, reflecting the intrinsic acid stability of its low-calcium N-A-S-H gel, while the fly ash-metakaolin blend (BI-FM) and the ternary blend lost the most strength under acid and frost respectively. The results identify two distinct controls on durability, matrix density and gel chemistry, and provide a quantitative basis for selecting precursor combinations in low-carbon construction.

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