凍結解凍状態に曝された粘土土の安定化
1Technical Vocational School of Higher Education, Ataturk University, Erzurum, Türkiye.
PloS one
|September 5, 2025
まとめ
ケブラー繊維は粘土の強さを高め 凍結解凍サイクルに抵抗します この研究は,ケヴラー補強が地質学的な用途の土壌耐久性を大幅に改善することを示しています.
科学分野:
- 地質工学
- 材料科学
- 環境科学
背景:
- 産業廃棄物,例えば使用済みケヴラー繊維は 処理に問題がある.
- 廃棄物の持続可能な利用は,環境と経済的利益のために不可欠です.
- 粘土土 (CLとCH) は凍結解凍サイクルで性能が低下する可能性があります.
研究 の 目的:
- 粘土土の凍結解凍耐性を改善するケヴラー繊維の有効性を調査する.
- 強化された粘土土の機械的特性に対するケヴラー用量の変化の影響を評価する.
- 地工学の応用における持続可能な補強材料としてのケヴラーの可能性を評価する.
主な方法:
- 廃棄したケヴラー繊維 (長さ10mm) をCLとCHの粘土と0.05%,0.25%,0.5%,1%の量で混合した.
- 試料は2回,5回,10回凍結解凍された.
- コンピュータ断層撮影 (CT) とスキャニング電子顕微鏡 (SEM) が材料の特徴化に使用された.
- ストレス-ストレスの行動,ピークストレス,凍結-解凍抵抗を評価した.
主要な成果:
- ピークストレスは,すべての凍結解凍サイクルで廃棄物ケヴラー含有量の増加とともに増加した.
- 1%のケヴラーを使用したCH粘土は,強化されていない土壌と比較して23%から59%のピークストレスの増加を示しました.
- 1%のケヴラーを使用したCL粘土は,強化されていない土壌と比較して43%から76%のピークストレスの増加を示した.
結論:
- 廃棄物ケヴラーは,粘土土の力学的な強さと耐久性を効果的に高め,凍結解凍効果に抵抗します.
- ケブラー繊維の添加は,寒い地域での土壌の性能を改善するための実行可能で持続可能な解決策です.
- この研究は,土壌安定化のための地質工学における産業廃棄物ケヴラーの使用を支持しています.
関連する概念動画
01:29Frost Resistant Concrete
135
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
135
01:27Frost Action on Concrete
148
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
This freeze-thaw cycle primarily causes surface scaling, where...
148
01:27Shrinkage in Concrete
166
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
166
01:27Cold Weather Concreting
111
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...
111
01:20Curing of Concrete
166
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
166
01:25Accelerated Curing of Concrete
254
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
254