ベースアルト繊維強化モルタルを用いたRCビームの柔らかい強化:実験的および分析的調査
Ayman Shamseldein1, Fareed ELgabbas2, Mohamed Kohail2
1Structural Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt. aymanshamseldein@eng.asu.edu.eg.
Scientific reports
|February 19, 2026
まとめ
コンクリートビームをベースアルト繊維強化モルタル (BTRM) で強化することで,負荷能力が最大18%向上しました. しかし,デボンドングは一般的な故障モードであり,BTRMの効果的な強化のためにより良い結合とアンカリングの必要性を示しました.
科学分野:
- 土木工学 土木工学とは
- マテリアルサイエンス 材料科学
- 構造工学 構造工学とは
背景:
- 鉄筋コンクリート (RC) 構造は,現在の需要を満たすために強化することがしばしば必要です.
- バサルト繊維強化モルタル (BTRM) は,構造改修のための有望な複合材料です.
研究 の 目的:
- BTRMで強化されたRCビームの屈折行動を調査する.
- BTRMの層構成,マッシュサイズ,アンカレージがビームの性能に与える影響を評価する.
- 既存の予測モデルを評価し,改善された分析アプローチを提案する.
主な方法:
- 6つのフルスケールRCビームが4ポイント曲線でテストされました.
- 標本には,コントロールビーム1本と,BTRM強化構成が異なるビーム5本が含まれていました.
- 分析モデルを検証,修正するために実験データを使用した.
主要な成果:
- BTRMのレイヤを3から5に増やすことで,最終負荷能力が最大18%向上しました.
- デボンドングは,強化の有効性を制限する,主要な失敗モードでした.
- 網格のサイズと固定装置の技術は,屈折性能に限られた影響を及ぼしました.
結論:
- BTRMは屈折能力を高めますが,結合とアンカリングの改善は最適な強化に不可欠です.
- 修正された予測方程式は,実験結果と文献データとの良好な一致を示した.
- BTRMのアプリケーションとアンカレージシステムを最適化するためにさらなる研究が必要である.
関連する概念動画
01:15Posttensioned Masonry Walls
Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
01:12Bonding and Strength of Aggregate
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
01:16Tensile Strength Considerations of Concrete
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen also...
The dimensions and shape of a concrete specimen also...
01:23Abrasion Resistance of Concrete
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
01:25Reinforcements in Concrete
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
01:22Fiber Reinforced Concrete
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...