ムール貝殻および石灰石由来のCaCO3多形が低炭素セメントの水和に及ぼす影響
Influence of CaCO 3 polymorphs from mussel shell and limestone on the hydration of low‐carbon cements (原題)
Mingjun Xie, Leqing Lin, Xu Li, Yaocheng Wang, Baojian Zhan, Feng Xing
🤖 gxceed AI 要約
日本語
石灰石粉末（LSP）とアラゴナイト主体のムール貝殻粉末（MSP）をポルトランドセメントに5〜20wt%置換し、CaCO3多形が水和に与える影響を比較した研究。両粉末は核生成サイトを提供し初期水和を促進したが、MSPは準安定なアラゴナイト構造によりアルミネート相との相互作用が強く、10wt%以下で同等以上の初期強度を示した。20wt%では希釈効果が顕著となり強度発現は限定的だった。
English
This study compares calcite-dominant limestone powder (LSP) and aragonite-rich mussel shell powder (MSP) as 5–20 wt.% partial replacements for Portland cement. Both accelerate early hydration via nucleation, but MSP shows a stronger promoting effect at moderate levels due to metastable aragonite's interaction with aluminate phases, yielding comparable or improved early strength up to 10 wt.%. At 20 wt.% dilution dominates and strength gains are limited.
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
セメント産業は日本のCO2排出の主要源であり、廃棄物由来の貝殻を混和材として活用する本研究は、建設業のScope 3排出削減や資源循環の観点から日本のGX実務に示唆を与える。ただし開示・政策フレームワークとの直接の接続は弱い。
In the global GX context
Cement production is a major global emissions source, and waste-derived shell powder as a supplementary cementitious material speaks to embodied-carbon reduction in construction supply chains relevant to Scope 3 accounting. However, it offers no direct linkage to TCFD/ISSB/CSRD disclosure frameworks.
👥 読者別の含意
🔬研究者:CaCO3多形（アラゴナイト vs カルサイト）が水和反応と初期強度に与える差異の実験的知見を得られる。
🏢実務担当者:廃棄貝殻を混和材として活用する際の置換率上限（約10wt%）の目安と初期強度への影響を把握できる。
📄 Abstract（原文）
Abstract Calcium carbonate is widely used as a low‐carbon component in cementitious binders, but its effect is commonly discussed in terms of dilution, filler effects and nucleation. The potential influence of CaCO 3 polymorphs remains less understood. This study compares calcite‐dominant limestone powder (LSP) and aragonite‐rich mussel shell powder (MSP) as partial replacements for Portland cement. Cement pastes containing 5–20 wt.% LSP or MSP were prepared to investigate the effects of CaCO 3 polymorphs on hydration kinetics, phase assemblage, mechanical performance and microstructure. Both carbonate powders accelerated early hydration by providing additional nucleation sites. Compared with LSP, MSP showed a stronger hydration‐promoting effect at moderate replacement levels, which is attributed to the metastable aragonite structure and its enhanced interaction with aluminate phases. The use of MSP promoted the formation of C–S–H and carbonate‐bearing AFm phases, leading to comparable or improved early strength at replacement levels not exceeding 10 wt.%. At 20 wt.% replacement, dilution became more pronounced and showed limited strength development. These results indicate that mussel shell powder can be regarded as a waste‐derived substitute from marine of limestone, which is a carbonate source with polymorph‐dependent reactivity for low‐carbon cement pastes.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1002/cepa.70863first seen 2026-10-30 04:55:04 · last seen 2026-10-31 04:57:53
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