アルカリ融解による石炭ガス化スラグの活性化と混合セメントへの適用：相再構成、水和挙動、力学性能
Activation of coal gasification slag by alkali fusion for blended cement: phase reconstruction, hydration behavior, and mechanical performance (原題)
Ziyang Hu, Xiaowei Gu, Shenyu Wang, Xiaowei Ge, Bohan Yang, Zhihang Hu, Xu Wang, Jianping Liu, Hao Wang
🤖 gxceed AI 要約
日本語
石炭ガス化スラグ（CGS）をNaOH添加のアルカリ融解で活性化し、混合セメントの水和挙動と強度への影響を検討した研究。NaOH量の増加に伴いSi・Al溶出が促進され、圧縮強度は非単調に変化し、SH-8で28日強度46.6MPaと最大となったが普通ポルトランドセメントより約8.4%低い。CGSの構造再構成とNa含有相生成の複合効果が性能を規定することを示す。
English
This study activates coal gasification slag (CGS) via NaOH-assisted alkali fusion and incorporates it into blended cement to examine phase reconstruction, Si/Al dissolution, hydration, and strength. Dissolved Si and Al peaked at SH-8 (42.81 and 22.59 mg/L), giving the highest 28-day strength of 46.6 MPa—still ~8.4% below OPC. NaOH dosage has a non-monotonic effect, with CGS structural reconstruction and Na-bearing phases jointly governing performance.
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
石炭ガス化スラグは中国の石炭化学産業で大量に発生する副産物であり、セメント混和材としての高付加価値利用は産業廃棄物由来のCO2排出削減に資する。日本のセメント業界が進める混合セメント・副産物活用の文脈とも接点があるが、日本の政策・開示制度との直接的な関連は薄い。
In the global GX context
Industrial by-product valorization in cement is a recognized decarbonization lever for hard-to-abate sectors, complementing clinker substitution and CCUS strategies. While not a disclosure or policy paper, it offers materials-level evidence relevant to embodied-carbon reduction in construction supply chains.
👥 読者別の含意
🔬研究者:石炭ガス化スラグのアルカリ活性化機構と水和への影響を定量化した材料科学的研究として参考になる。
🏢実務担当者:セメント・建設企業が副産物由来混和材の強度特性と配合最適化を検討する際の基礎データとなる。
📄 Abstract（原文）
Alkali fusion is an effective strategy to enhance the reactivity of coal gasification slag (CGS) and promote its high-value utilization in cementitious materials. However, the structural reconstruction of alkali-fused CGS and its influence on the hydration behavior of blended cement systems remain unclear. In this study, CGS activated by different NaOH dosages was incorporated into blended cement systems to investigate the relationships among phase reconstruction, reactive species dissolution, hydration evolution, and macroscopic performance. The results showed that NaOH-assisted alkali fusion altered the phase assemblage and structural characteristics of CGS and promoted the measured dissolution of Si and Al species. SH-8 contained approximately 6.5 wt% Na 2 SiO 3 and exhibited the highest dissolved Si and Al concentrations of 42.81 and 22.59 mg/L, respectively. The subsequent hydration behavior reflected the coupled effects of CGS structural reconstruction and the NaOH-derived Na-containing phases formed during fusion. Consequently, the compressive strength of the CGS-containing blended cement first increased and then decreased with increasing NaOH dosage. SH-8 achieved the highest 28 d compressive strength among the CGS-containing mixtures, reaching 46.6 MPa, although this value remained approximately 8.4% lower than that of the OPC control mixture (50.9 MPa). This study demonstrates the non-monotonic influence of NaOH dosage on alkali-fused CGS and highlights the coupled roles of CGS structural reconstruction and NaOH-derived phase formation in regulating the hydration behavior and performance of CGS-containing blended cement.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.conbuildmat.2026.148225first seen 2026-09-19 05:13:20
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