使用人工智能制定低温混合模式破裂传播行为碎改造HMA的碎
Sepehr Ghafari1, Mehrdad Ehsani2, Sajad Ranjbar2
1School of Built Environment, Engineering and Computing, Leeds Beckett University, Leeds, UK.
Scientific reports
|July 2, 2025
概括
这项研究研究了在低温下青混凝土的断裂行为,发现碎提高了裂抵抗力. 机器学习模型预测混合模式骨折参数,多基因遗传编程提供了明确的预测方程.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 青混凝土表现出复杂的非同质性和不弹性,在确定混合模式断裂参数方面提出了挑战.
- 了解低温断裂行为对于路面的耐用性和性能至关重要.
- 粉碎改造被探索为一种提高青混凝土破裂性能的方法.
研究的目的:
- 在模式I和混合模式 (I/II) 负载下确定未经修改和碎修改的热混合青 (HMA) 的低温R曲线.
- 要提取关键的断裂参数:凝聚能 (Gb),能量速率 (Gf) 和断裂能量 (Gi).
- 开发和比较机器学习模型,用于预测混合模式断裂参数.
主要方法:
- 单边切割束 (SE(B)) 测试用于收集断裂数据.
- 在裂传播的不同阶段提取了断裂参数 (Gb,Gf,Gi).
- 使用五种机器学习技术 (回归,MGGP,SVR,随机森林,ANN) 来构建预测模型.
主要成果:
- 对于AC 85/100,确定了-20°C的临界温度,从准脆性转变为脆性的断裂.
- 加入20%的粉碎改善了材料特性,即使在不稳定的裂传播过程中也显示出上升的R曲线.
- 多基因遗传编程 (MGGP) 模型实现了高R2值 (高达0.94),用于预测Gb,Gf和Gi.
结论:
- 粉碎改性增强了青混凝土在低温下的断裂性.
- 机器学习模型,特别是MGGP,可以有效地预测混合模式骨折参数.
- MGGP为裂传播提供了明确的数学表达式,为材料设计提供了宝贵的见解.
相关概念视频
Microcracking in Concrete
212
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
212
Types of Cement I
187
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
187
Design Example: Managing Concrete Workability
123
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
123
Abrasion Resistance of Concrete
220
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...
220
Mass Concreting
112
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
112
Creep in Concrete
479
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
479


