高強度、低炭素、費用対効果の高いセメントペースト開発のための酸化グラフェンによるリサイクルコンクリート粉末表面改質
Siyao Wang1, Jiaqi Wang1, Jiajian Yu1
1School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China.
Environmental research
|December 19, 2025
まとめ
リサイクルコンクリート粉末(RCP)を酸化グラフェン(GO)でコーティングすることにより、その性能と作業性が向上します。この持続可能なアプローチは、セメント系材料のCO2排出量とエネルギー消費量を削減します。
科学分野:
- 材料科学
- 土木工学
- 環境科学
背景:
- リサイクルコンクリート粉末(RCP)は環境上の利点を提供しますが、セメントよりも水和活性が低いという欠点があります。
- この低下した活性は、リサイクル材料の機械的特性と耐久性を損ないます。
- 建設におけるRCPの利用を改善するには、効果的な改質が必要です。
研究 の 目的:
- 酸化グラフェン(GO)を用いたRCPの表面改質戦略を開発すること。
- RCPのアルカリ活性と性能を向上させること。
- GOコーティングRCPが材料特性、細孔構造、持続可能性に与える影響を評価すること。
主な方法:
- リサイクルコンクリート粉末(RCP)への酸化グラフェン(GO)の表面標的コーティング。
- GO分散と表面改質を確認するための顕微鏡検査。
- 作業性、機械的強度、耐久性を含むセメント複合材料におけるGOコーティングRCPの性能評価。
主要な成果:
- GOナノシートはRCP表面に効果的に分散し、アルカリ活性を向上させました。
- GOの潤滑効果により、フレッシュ複合材料の作業性が6.7-11%向上しました。
- 機械的強度は24.4-59.3%向上し、塩化物イオン浸透抵抗は最大49.6%向上しました。
結論:
- RCPのGOによる表面改質は、材料の性能と耐久性を大幅に向上させます。
- GOコーティングRCPは、核生成と細孔充填効果を通じて細孔構造を最適化します。
- この持続可能な改質は、グリーンセメント系材料のための低炭素、低コストの経路を提供します。
関連する概念動画
Porosity in Cement Paste
420
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
The balance of water to cement in the mix is...
420
Additives and Fillers in Concrete
305
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
305
Types of Cement II
371
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
371
Portland Cement
570
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
570
Pozzolans
446
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
446
Superplasticizers
272
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
272


