M30構造グレード向け低炭素代替としての常温養生フライアッシュ–スラグジオポリマーコンクリートの実験的・統計的評価
Experimental And Statistical Evaluation of Ambient-Cured Fly Ash–Slag Geopolymer Concrete as A Low-Carbon Alternative to Portland Cement Concrete for M30 Structural Grade (原題)
Preeti, Dr. Varinder Singh
🤖 gxceed AI 要約
日本語
ポルトランドセメントのCO2排出削減のため、フライアッシュ70%・高炉スラグ30%の常温養生ジオポリマーコンクリートをM30グレードで試作し、圧縮強度・スランプ・コスト・炭素排出を統計的に評価した。28日強度は34.23MPaで対照を上回り、埋め込み炭素は385.6から165.8kg/m³へ57%削減されたが、活性化剤が炭素の88.9%を占めた。コストは実験室価格で22%増、バルク価格で17%減となり、優位性は活性化剤の調達と算定方法に依存する。
English
An ambient-cured geopolymer concrete (70% fly ash, 30% slag) was tested for M30 structural grade, achieving 34.23 MPa at 28 days versus 31.53 MPa for Portland cement control. Embodied carbon dropped 57% (385.6 to 165.8 kg/m³), with activators contributing 88.9% of emissions. Cost was 22% higher at lab chemical prices but 17% lower at bulk prices, so benefits hinge on activator sourcing and carbon accounting.
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・原材料由来排出削減に直結し、SSBJや有報でのセメント代替材の低炭素訴求を裏付ける実証データとして日本企業の脱炭素調達に有用。
In the global GX context
Offers quantitative embodied-carbon evidence for low-carbon construction materials relevant to Scope 3 accounting and green procurement under ISSB/CSRD disclosure regimes.
👥 読者別の含意
🔬研究者:常温養生ジオポリマーの強度・炭素・コストを統計的に比較した実証データを参照できる。
🏢実務担当者:セメント代替材の導入検討で、活性化剤調達が炭素・コスト優位性を左右する点を押さえられる。
🏛政策担当者:建設資材の低炭素化促進には活性化剤の調達・算定ルール整備が鍵となる点を示唆。
📄 Abstract（原文）
Background: Portland cement production releases large quantities of carbon dioxide through limestone calcination and fuel combustion, and geopolymer concrete made from industrial by-products is a candidate replacement; however, most mix designs depend on heat curing, which is impractical for cast-in-situ work. Methods: A 30 MPa grade geopolymer concrete was proportioned by a density-based method using 70% Class F fly ash and 30% ground granulated blast-furnace slag, activated by 12 molar sodium hydroxide and sodium silicate at a silicate-to-hydroxide ratio of 2.5 and an activator-to-binder ratio of 0.45, and cured at 27 ± 2 °C without heat or water. A water-cured Portland cement concrete served as control. Slump and cube compressive strength at 7, 14 and 28 days (three cubes per age) were measured, followed by Welch tests, two-way analysis of variance, log-age regression, a material cost inventory and a cradle-to-gate carbon inventory with sensitivity analysis. Results: The geopolymer mix reached 34.23 ± 0.47 MPa at 28 days against 31.53 ± 0.45 MPa for the control (difference 2.70 MPa, p = 0.002), with lower slump (85 versus 105 mm). Embodied carbon fell from 385.6 to 165.8 kg per cubic metre (57.0%), of which the activators contributed 88.9%. Material cost was 22.0% higher at laboratory chemical prices and 17.0% lower at bulk prices. Conclusions: Ambient-cured fly ash–slag geopolymer concrete met the 30 MPa characteristic level with less than half the embodied carbon of the control, but its cost and carbon advantages depend mainly on activator sourcing and accounting.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5281/zenodo.23563308first seen 2026-10-24 04:44:52 · last seen 2026-11-06 04:52:30
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