Thermally Treated Asbestos–Cement Waste as a Low-Carbon Circular Cement: Effects on the Properties of Air‑Cured Fiber Cement
熱処理されたアスベストセメント廃棄物を用いた低炭素循環型セメント：気中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を熱処理して得られた低炭素循環型バインダー（C²BC）を、ポルトランドセメントの25%代替として繊維セメント板に使用した場合の効果を評価した。C²BCは凝結時間を10%短縮し、初期反応性を向上させた。クリンカーファクターを18.4%削減したにもかかわらず、水和効率は基準と同等であった。複合材料レベルでは、乾燥収縮を増加させず、見かけ密度を約5%低減し、曲げ強度（MOR）を13%、靭性を50%向上させた。これは、セメント産業の脱炭素化と有害廃棄物の価値化に有望な戦略である。
English
This study evaluated the use of a low-carbon circular binder (C²BC) obtained from thermally treated asbestos-cement waste as a 25% replacement for Portland cement in fiber-cement boards. C²BC shortened setting time by 10% and increased early-age reactivity, while reducing the clinker factor by 18.4% without compromising hydration efficiency. At the composite level, it reduced apparent density by ~5%, increased modulus of rupture by 13%, and toughness by 50%, with no increase in drying shrinkage. This strategy shows promise for decarbonizing the cement industry 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
本研究成果は、廃棄物を原料とした低炭素セメントの可能性を示しており、日本のGX政策における産業部門の脱炭素化や循環経済の推進に示唆を与える。特に、建設資材分野でのCO2削減と廃棄物処理の両立に貢献しうる。
In the global GX context
This paper contributes to the global agenda of decarbonizing hard-to-abate industrial sectors, particularly cement production, by demonstrating a circular approach using hazardous waste. It supports the development of low-carbon building materials, relevant for international climate targets and circular economy initiatives.
👥 読者別の含意
🔬研究者:Provides experimental data on using thermally treated asbestos-cement waste as a supplementary cementitious material, offering insights for cement chemistry and waste valorization.
🏢実務担当者:Demonstrates a viable method to reduce clinker content in fiber-cement products, potentially lowering carbon footprint and production costs while utilizing hazardous waste.
🏛政策担当者:Highlights the potential for policy support in industrial waste recycling and low-carbon material standards, aligning with circular economy and decarbonization goals.
📄 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.20548303first seen 2026-06-06 04:58:02
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