Workability challenges imposed by calcined illitic and smectitic clays: Practical insights into their behavior as SCM in low-carbon cements
焼成イライトおよびスメクタイト系粘土によるワーカビリティ問題：低炭素セメント中のSCMとしての挙動に関する実践的知見 (AI 翻訳)
Jiaxin Chen, J. Plank
🤖 gxceed AI 要約
日本語
本論文は、低炭素セメントの混和材として期待される焼成粘土（CC）のうち、欧州に豊富なイライト・スメクタイト系粘土に着目し、ポリカルボン酸系高性能減水剤（PCE）との相互作用を調査した。メタカオリンや焼成イライト粘土は高い吸水量を示し、PCEの分散効率は分子構造に強く影響される。特に焼成イライト粘土は多量のPCEを要し、遅延添加により必要量を大幅に低減できることが示された。モルタル試験ではスランプ保持性に課題があり、粘土鉱物学に応じたPCE分子設計の重要性を指摘している。
English
This paper investigates the interaction between polycarboxylate superplasticizers and calcined illitic/smectitic clays (prevalent in Europe) as supplementary cementitious materials for low-carbon cements. Calcined illitic clays demand high PCE dosages, but delayed addition can significantly reduce the required amount. The study emphasizes the need for tailored superplasticizers based on clay mineralogy to address workability challenges in low-carbon cement systems.
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
日本でもセメント産業の脱炭素は急務であり、粘土系SCMの利用は有望だが、本論文のような非カオリン系粘土の挙動理解は日本国内の原料事情にも応用可能。
In the global GX context
Low-carbon cements are critical for industrial decarbonization globally. This paper provides practical insights into workability issues with non-kaolinitic clays, which are abundant in Europe but also relevant to other regions, highlighting the need for tailored chemical admixtures.
👥 読者別の含意
🔬研究者:Researchers in cement chemistry and admixture design will find detailed structure-property relationships for PCEs on calcined clays.
🏢実務担当者:Cement producers can use findings to optimize superplasticizer selection and addition strategies for low-carbon blended cements.
📄 Abstract（原文）
The use of calcined clays (CCs) as supplementary cementitious materials is gaining increasing attention as a strategy to lower the carbon footprint of cement production. To date, research has largely concentrated on kaolinite-rich (1:1) clays, which are relatively scare in Europe, where illitic and smectitic clays are more prevalent. This work investigates the interaction between polycarboxylate (PCE) superplasticizers and calcined illitic, smectitic, mixed-layered clays, and meta kaolin in binary OPC/CC blended systems. Meta kaolin and calcined illitic clays exhibited notably increased water demand. A series of methallyl ether (HPEG) PCEs were synthesized and applied, demonstrating that dispersing efficiency is strongly influenced by the molecular structure. PCEs with medium-long side chains and high anionicity (e.g. 52HPEG10) exhibited optimal fluidizing effectiveness. Notably, calcined illitic clays required substantially higher PCE dosages, one sample even could not be adequately dispersed despite the excessive dosage (2 wt% of binder). Interestingly, delayed addition of PCE could reduce PCE dosage demand significantly, especially at low water-to-binder ratios (0.4–0.5), indicating a simple and effective strategy to mitigate the adverse impact of CCs on workability. Mortar tests further revealed severe slump retention challenges posed by illite- and smectite-rich CCs. Adsorption and XRD analyses indicate that PCEs interact with CCs only via physisorption, with calcined illitic clays showing linear adsorption isotherms, which could explain their poor workability. Overall, the results highlight the critical role of PCE molecular architecture and clay mineralogy, emphasizing the need for tailored superplasticizers in calcined clay based low-carbon cements.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.conbuildmat.2026.146885first seen 2026-06-06 04:57:07
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