超臨界二酸化炭素養生における応力と微細構造劣化
Supercritical Carbon Dioxide Curing Stresses and Microstructural Degradation (原題)
Mohamed Fayez. Elnagar, Structural Consultant & Certified Forensic Engineering Expert MSc, PMP, MCIArb, MASCE, MACI, M.AISC, M.ASTM, M.FIDIC, PhD
🤖 gxceed AI 要約
日本語
超臨界CO2（sCO2）をコンクリート養生に注入し、炭酸カルシウム析出により炭素を固定しつつ早期強度を高める手法を検討。しかしsCO2の超臨界状態維持に伴う高い細孔圧力と体積膨張が微細引張応力を生み、内部ひび割れ・毛細管空隙増大・骨材界面剥離を引き起こす。早期圧縮強度は高くても長期耐久性や塩化物・硫酸塩抵抗性が損なわれるため、熱-水-化学連成方程式に基づく養生管理が不可欠と指摘する。
English
Injecting supercritical CO2 (sCO2) into fresh concrete can permanently store carbon while rapidly boosting early-age strength via calcium carbonate precipitation. However, maintaining sCO2 stability creates extreme pore pressures and non-uniform volumetric expansion, generating micro-tensile stresses that cause internal micro-cracking, increased porosity, and aggregate-paste debonding. High early compressive strength may mask compromised long-term durability and chemical resistance, so coupled thermo-hydro-chemical curing models are needed for safe mass production.
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
日本はコンクリート分野のCO2固定化（カーボンリサイクル）をGX技術として推進しており、本稿は実装時の耐久性リスク管理という実務的論点を提示する。SSBJ開示とは直接関係しないが、建設業のScope3削減・グリーン調達の技術的裏付けとして参考になる。
In the global GX context
As global decarbonization pushes carbon capture and utilization (CCU) into building materials, this paper highlights a durability risk that could undermine the climate benefit of sCO2 curing. It contributes to the emerging literature on embodied-carbon reduction in construction, relevant to green building standards and lifecycle assessment under frameworks like CSRD and ISSB.
👥 読者別の含意
🔬研究者:Provides a mechanics-based framework for understanding coupled stress and chemical degradation in sCO2-cured cementitious systems.
🏢実務担当者:Warns construction firms that sCO2 curing may trade early strength for long-term durability, requiring careful process control.
🏛政策担当者:Suggests that CCU standards for building materials should include durability testing to avoid unintended infrastructure risks.
📄 Abstract（原文）
Accelerating the curing process of concrete by injecting carbon dioxide—specifically in its supercritical state (sCO2)—represents a revolutionary method to capture carbon permanently within building materials while rapidly achieving high early-age strength. During this process, the dissolved gas reacts with calcium silicate phases in the fresh mix to precipitate calcium carbonate inside the concrete pores. However, this eco-friendly curing methodology introduces a severe mechanical stabilization dilemma. The core engineering dilemma centers around the high pore pressures and microstructural stress distributions that develop as the gas transitions to a supercritical state within the fresh, unhardened cement paste matrix. The extreme pressure gradients required to maintain sCO2 stability induce non-uniform volumetric expansions within the concrete capillary pores. If the internal pressure dissipation is not meticulously controlled, the gas phase expansion generates micro-tensile stresses that exceed the tensile strength of the early-stage concrete matrix. This mismatch results in extensive internal micro-cracking, increased capillary porosity, and localized aggregate-paste debonding. While the concrete may display high early compressive strength due to rapid carbonation, its long-term durability, fracture toughness, and resistance to aggressive chemical ingress (such as chloride and sulfate attacks) are critically compromised. Standard concrete curing guidelines lack the coupled thermo-hydro-chemical equations to manage these dynamic pore stresses, presenting a major barrier to the safe mass-production of sCO2-cured components.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5281/zenodo.23033200first seen 2026-10-02 04:55:07
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