Thermally Treated Asbestos–Cement Waste as a Low-Carbon Circular Cement: Effects on the Properties of Air‑Cured Fiber Cement
熱処理アスベストセメント廃棄物による低炭素循環セメント：空気養生繊維セメントの特性への影響 (AI 翻訳)
Geane Carneiro, Vanderley Moacry John, Cléber Marcos Ribeiro Dias
🤖 gxceed AI 要約
日本語
本研究は、アスベストセメント廃棄物（ACWnat）の熱処理により低炭素循環結合材（C²BC）を生成し、繊維セメント板におけるポルトランドセメントの25%代替としての性能を評価。C²BCは水和プロファイルを変化させ、凝結時間を10%短縮、初期反応性を向上。複合材料レベルでは、乾燥収縮の増加なし、密度5%低減、曲げ強度13%増加、靭性50%向上、比例限界30%低下を達成。クリンカーファクター換算では67.5%の性能向上を示し、セクターの脱炭素化と有害廃棄物価値向上に有望。
English
This study evaluates thermally treated asbestos-cement waste (C²BC) as a 25% replacement for Portland cement in fiber-cement boards. C²BC alters hydration, shortening setting time by 10% and increasing early reactivity. At composite level, it reduces density by 5%, increases MOR by 13%, toughness by 50%, and decreases LOP by 30%. Normalized by clinker factor, MOR improves 67.5%. This circular binder shows potential for decarbonizing the cement sector and valorizing hazardous waste.
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
日本ではアスベスト廃棄物処理が課題であり、循環経済と脱炭素化を両立する本技術は、建設分野のGX推進に示唆を与える。ただし、実用化には日本の規制や原料特性への適合性評価が必要。
In the global GX context
This paper presents a low-carbon circular binder from hazardous waste, contributing to global decarbonization of cement production. The approach aligns with circular economy principles and could support Scope 3 emission reductions in construction materials. International relevance lies in its potential to reduce clinker factor while improving mechanical performance.
👥 読者別の含意
🔬研究者:Researchers in cement chemistry and circular economy can explore the hydration kinetics and mechanical performance of thermally treated asbestos-cement waste as a supplementary cementitious material.
🏢実務担当者:Cement and fiber-cement manufacturers can consider C²BC as a means to reduce clinker factor and carbon footprint while enhancing product toughness.
🏛政策担当者:Policymakers in waste management and construction can evaluate this technology for safe disposal of asbestos waste and promotion of low-carbon building materials.
📄 Abstract（原文）
Thermal treatment of asbestos-cement waste (ACWnat) offers a pathway to produce a low-carbon circular binder (C²BC), supporting circular-economy goals in the fiber-cement sector. This study assessed the use of C²BC as a 25% partial replacement for Portland cement in fiber-cement boards and investigated its effects on matrix hydration kinetics (isothermal calorimetry and bound water) and on the physical and mechanical performance of the composites. The results show that C²BC altered the hydration profile, shortening the setting time by 10% and increasing early-age reactivity. Despite a 18.4% reduction in the clinker factor, hydration efficiency remained comparable to that of the reference mixture, an advantageous outcome for formulations optimized for the Hatschek process. At the composite level, C²BC did not increase drying shrinkage, reduced apparent density by approximately 5%, and delivered substantial mechanical improvements: +13% in modulus of rupture (MOR), and +50% in toughness, along with a 30% decrease in limit of proportionality (LOP). When MOR was normalized by clinker factor, performance increased by 67.5%, underscoring the high efficiency of this binder. Overall, incorporating C²BC appears to be a promising strategy to reduce clinker demand, accelerate sector decarbonization, and valorize hazardous waste.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5281/zenodo.20548304first seen 2026-06-06 04:57:44
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