低炭素セメント系材料における活性化再生コンクリート微粉末評価のための強度対環境影響フレームワーク
A strength-to-impact framework for evaluating activated recycled concrete powder in low-carbon cementitious systems (原題)
Syed Roshan Zamir Hashmi, Helamini Sandagomika, Reyes Garcia, Mehrdad Arashpour, Sudharshan Naidu Raman
🤖 gxceed AI 要約
日本語
建設廃棄物由来の再生コンクリート微粉末(RCP)をセメント代替材として用いる際の環境効率を、圧縮強度で正規化したStrength to Impact Index(SII)で評価した研究。未処理RCP30%置換が端点影響を最小化し、400℃活性化RCP10%置換が最高の環境効率を示した。炭酸化養生はエネルギー負荷が性能向上を上回り効率を低下させ、電力供給が最大の変動要因だった。
English
Cradle-to-gate LCA of mortars with 10-30% OPC substitution by untreated, thermally activated, and pre-carbonated recycled concrete powder, normalized by 28-day compressive strength via a Strength-to-Impact Index. Untreated RCP at 30% gave the lowest endpoint burden, while 400°C activated RCP at 10% was most eco-efficient; carbonation curing reduced net eco-efficiency. Electricity supply dominated sensitivity.
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
建設業のScope 3(購入資材)排出と廃棄物循環の両面に関わる。SSBJのScope 3算定や建設会社の低炭素資材調達の根拠づけとして参考になるが、日本固有の制度接続は薄い。
In the global GX context
Relevant to embodied-carbon accounting in construction and circular-material procurement under Scope 3 and CSRD/ISSB building-sector disclosures, offering a function-based (strength-normalized) screening metric for low-carbon binders.
👥 読者別の含意
🔬研究者:性能正規化した環境効率指標(SII)とモンテカルロ感度分析の手法が、建材LCA研究の設計に応用できる。
🏢実務担当者:低炭素セメント代替材の選定で、置換率と活性化温度のトレードオフを強度当たり環境負荷で比較する視点を提供する。
🏛政策担当者:建設廃棄物の資源循環と低炭素建材普及の政策設計で、電力由来影響が支配的である点を考慮すべき。
📄 Abstract（原文）
The construction sector is envisaging to reduce CO 2 emissions from cement and concrete production while managing growing volumes of construction and demolition waste. Recycled concrete powder (RCP) has the potential to substitute Portland cement in concrete, but its environmental viability depends on activation intensity, substitution level, and system-level trade-offs. This study assessed performance-normalized eco-efficiency framework of mortar systems with 10-30% OPC substitution using untreated, thermally activated (400-800 °C) and pre-carbonated RCP, and carbonation-cured mortars though a cradle-to-gate Life Cycle Assessment (LCA). Environmental impacts were quantified using ReCiPe 2016 and normalised by compressive strength at industry accepted standard of characteristic 28-days to enable function-based comparison through the Strength to Impact Index (SII). OPC substitution reduced Endpoint impacts by up to 10.8%, with 30% untreated RCP achieving the lowest burden (13.903 mPt) and reducing climate-related Human Health damage by up to 17% for untreated RCP and up to 14.5% for 400 °C activated RCP at 30% replacement. The highest eco-efficiency (SII = 3.407 MPa/mPt) was observed at 10% substitution of 400 °C activated RCP, which outperformed higher-temperature activations. A Monte Carlo simulation on replacement ratio and carbonation efficiency indicated that, for the thermally activated and pre-carbonated route under the Malaysian grid, these two variables did not change the direction of the Endpoint advantage over OPC. Conversely, post carbonation curing resulted in a net decrease in eco-efficiency because curing-energy impacts outweighed performance gains. Sensitivity analyses identified electricity supply as the dominant source of variability. The findings provide a performance-based framework for eco-efficient screening of binder systems in sustainable concrete construction.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.jobe.2026.117619first seen 2026-10-23 05:14:56 · last seen 2026-11-06 04:50:37
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