再生セラミックおよび再生コンクリート細骨材が低炭素セメントモルタルの力学特性と凍結融解抵抗性に及ぼす影響
Influence of Recycled Ceramic and Concrete Fine Aggregates on the Mechanical Properties and Freeze–Thaw Resistance of Low-Carbon Cement Mortars (原題)
Maria Ratajczak, Daria Chojnacka, Katarzyna Jabłońska, Marta Thomas, Agnieszka Ślosarczyk
🤖 gxceed AI 要約
日本語
建設廃棄物由来の再生セラミック細骨材（RCerFA）と再生コンクリート細骨材（RConFA）を天然砂の20%・40%代替で用い、低炭素セメントモルタルの力学特性・凍結融解抵抗性・ポゾラン活性・環境性能を評価した。RConFAは20%代替で性能を維持したが、RCerFA40%は性能を低下させた。未粉砕状態ではポゾラン反応は確認されず、炭素フットプリントには骨材よりセメント種の影響が大きかった。
English
Recycled ceramic (RCerFA) and concrete (RConFA) fine aggregates replaced 20–40% of natural sand in low-carbon cement mortars, with mechanical, freeze–thaw, pozzolanic and GWP performance assessed. RConFA at 20% maintained satisfactory performance; 40% RCerFA degraded it. Unground recycled materials showed no confirmed pozzolanic reactivity, and cement type dominated carbon footprint over aggregate substitution.
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
日本では建設リサイクル法やカーボンニュートラル建材の文脈で、低炭素コンクリート・再生骨材の活用はScope 3削減やグリーン調達に直結する。SSBJ開示で建設業の上流排出が問われる中、材料段階のGWP評価は有報・統合報告の裏付けデータになり得る。
In the global GX context
For global GX, this supports circular-economy and embodied-carbon accounting in construction, feeding into Scope 3 category 1 and green building certification (LEED, BREEAM). It adds empirical evidence that cement type, not aggregate substitution, drives GWP—useful for CSRD/ISSB disclosure on material decarbonization levers.
👥 読者別の含意
🔬研究者:再生細骨材の置換率と凍結融解耐久性のトレードオフ、およびGWP支配要因がセメント種である点を定量化した材料研究として参考になる。
🏢実務担当者:低炭素モルタル調合でRConFA20%代替は性能維持の選択肢になり得るが、RCerFA高置換は避け、セメント種選定を優先すべき。
🏛政策担当者:建設廃棄物リサイクル促進策を設計する際、再生骨材の品質基準とセメント由来排出の優先的削減の必要性を示唆する。
📄 Abstract（原文）
The reuse of construction and demolition waste in cementitious materials supports the development of sustainable low-carbon composites and circular economy strategies. This study investigated the influence of recycled ceramic fine aggregate (RCerFA) and recycled concrete fine aggregate (RConFA) on the mechanical properties, freeze–thaw durability, pozzolanic potential, and environmental performance of cement mortars prepared with different cement types. Mortars containing 20% and 40% replacement of natural sand with recycled aggregates were evaluated through strength testing and freeze–thaw resistance assessment, while SEM analysis and pozzolanic potential were assessed on separate mortars in which 25% of the cement binder was replaced with the recycled materials, alongside carbon footprint calculations based on global warming potential (GWP), using the recycled materials directly after the crushing process without additional grinding. The results showed that mortars containing recycled concrete fine aggregate generally maintained satisfactory mechanical performance and freeze–thaw resistance, particularly at the 20% replacement level. In contrast, 40% RCerFA reduced mechanical performance and freeze–thaw resistance. Neither recycled material demonstrated confirmed pozzolanic reactivity in its unground state. Although one RConFA mixture exceeded the 75% compressive strength index criterion, this result alone was insufficient to confirm a chemical pozzolanic reaction. Environmental assessment demonstrated that cement type had a greater influence on carbon footprint than recycled aggregate incorporation. The study confirms the potential applicability of recycled fine aggregates in sustainable low-carbon cement mortars and explores their possible use as low-energy supplementary cementitious components.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/app16188992first seen 2026-09-12 05:03:24
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