高强度不钢丝网在工程水泥复合材料中的粘合滑动行为:数值和理论分析
Xuyan Zou1,2, Tao Zhang1, Ziyuan Li1
1Department of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel, Switzerland)
|December 17, 2024
概括
这项研究开发了高强度不钢丝网 (HSSWM) 增强的工程水泥复合材料 (ECC),提高了性和耐腐蚀性. 一个新的局部粘合滑动模型准确地预测HSSWM-ECC粘合性能,以改进材料设计.
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.
- 结构工程 结构工程
背景情况:
- 工程水泥复合材料 (ECCs) 提供增强的柔性,但需要强大的强化.
- 高强度不钢丝网 (HSSWM) 为ECC提供了一个新的增强选项,提高了性和耐腐蚀性.
- 对于复合材料的结构完整性来说,HSSWM和ECC之间的有效结合是至关重要的.
研究的目的:
- 为了研究HSSWM和ECC之间的债券行为.
- 开发和验证HSSWM-ECC相互作用的局部债券滑动模型.
- 在ECC中建立HSSWM anchorage长度和结合能力的预测模型.
主要方法:
- 债券行为的理论分析. 债券行为.
- 基于平均债券滑坡原则的本地债券滑坡模型的开发.
- 有限元分析 (FEA) 研究材料特性和几何学对粘合滑动行为的影响.
- 微元素方法分析用于债券应力分布.
主要成果:
- 与平均模型相比,拟议的本地债券滑动模型在预测HSSWM-ECC债券性能方面表现出卓越的准确性.
- FEA的结果,包括拉力强度,丝径和间距,与实验数据密切匹配.
- 微元素方法提供了关于债券应力分布的见解.
- 建立了对关键 anchorage 长度和结合能力的验证预测模型.
结论:
- 当地债券滑动模型有效地捕捉了HSSWM和ECC之间的复杂的结合机制.
- FEA和实验数据证实了该模型的预测能力.
- 开发的模型为设计HSSWM增强的ECC结构提供了必不可少的工具,以优化性能和耐用性.
相关概念视频
01:12Bonding and Strength of Aggregate
139
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...
139
01:30Ferrocement
139
Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
139
01:25Reinforcements in Concrete
70
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...
70
01:16Tensile Strength Considerations of Concrete
112
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...
The dimensions and shape of a concrete specimen...
112
01:20Strength of Cement
122
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
122
01:22Fiber Reinforced Concrete
68
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...
68