关于基岩聚烯纤维增强高性能混凝土冲击性能的实验研究
Maoyu Zhang1, Bo Li2, Zezhong Zheng3
1School of Civil Engineering and Architecture, Taizhou University, Jiaojiang 318000, China.
Materials (Basel, Switzerland)
|July 13, 2024
概括
这项研究研究了玄武岩纤维 (BF) 和聚烯纤维 (PF) 以提高高性能混凝土 (HPC) 的抗冲击性. 0.15%BF和0.1%PF的组合显示出最好的结果,证明了积极的混合动力效应.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 混凝土技术 混凝土技术
背景情况:
- 高性能混凝土 (HPC) 要求在苛刻的应用中提高抗冲击能力.
- 加入纤维增强是改善混凝土机械性能的一个关键策略.
- 玄武岩纤维 (BF) 和聚烯纤维 (PF) 为混凝土增强提供了潜力.
研究的目的:
- 评估用玄武岩纤维 (BF) 和聚烯纤维 (PF) 增强的HPC的抗冲击性能.
- 调查单一和组合纤维增强对冲击能耗,柔性和性的影响.
- 分析断裂阻力增强机制,并使用韦布尔分布预测故障概率.
主要方法:
- 落重量冲击测试是在不同的BF和PF体积分数 (0.1%,0.15%,0.2%) 的混凝土样本上进行的.
- 测量了冲击能量消耗,柔性比率和性因子.
- 韦布尔分布函数被应用于模型测试结果和预测失败概率.
- 进行了微观分析,以了解纤维增强机制.
主要成果:
- HPC抵御的冲击数量遵循一个双参数的韦布尔分布.
- 与单一纤维类型相比,0.15%的BF和0.1%的PF组合显示出优越的抗冲击能力.
- 混合纤维钢筋对混凝土的冲击性能产生了积极的协同效应.
结论:
- 使用玄武岩和聚烯纤维的混合增强有效地提高了高性能混凝土的抗冲击能力.
- 0.15%BF和0.1%PF的最佳组合可以显著提高冲击性能.
- 韦布尔模型准确地预测了纤维增强混凝土的冲击行为.
相关概念视频
01:22Fiber Reinforced Concrete
73
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...
73
01:23Abrasion Resistance of Concrete
125
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...
125
01:21Impact Strength of Concrete
189
Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
189
01:22Fatigue Strength of Concrete
183
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
183
01:12Bonding and Strength of Aggregate
146
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...
146
01:21Pozzolans
109
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...
109