基于多相多种电化学相场建模的钢筋混凝土腐蚀裂变的模拟
Tianhao Yao1, Houmin Li1, Keyang Wu2
1School of Civil Engineering, Architecture and the Environment, Hubei University of Technology, Wuhan 430068, China.
Materials (Basel, Switzerland)
|August 28, 2025
概括
这项研究引入了多种电化学相场模型,以模拟由铁杆腐蚀引起的混凝土裂. 它准确地预测了裂的持续时间和形状,有助于结构耐久性评估.
科学领域:
- 材料科学
- 土木工程
- 电化学
背景情况:
- 钢筋混凝土中不均的腐蚀裂是结构耐久性损坏的主要原因.
- 了解腐蚀,胀和裂纹的相关机制对于预测材料寿命至关重要.
研究的目的:
- 开发一个微观的多种电化学相场模型,以模拟和分析钢筋混凝土中腐蚀诱导的裂纹.
- 研究电化学反应的时空合,离子运输和断裂力学.
主要方法:
- 综合电化学反应动力学,多离子运输和相场断裂理论.
- 使用局部腐蚀电流密度作为关键变量,将电化学过程与生膨胀和裂传播联系起来.
- 使用相场模拟进行断裂启动和传播分析.
主要成果:
- 该模型准确地预测了裂持续时间,裂形状和离子度分布,并通过实验数据进行了验证.
- 当地腐蚀电流密度有效地表明了电化学反应速率.
- 参数研究揭示了各种因素 (如氧气扩散,保护层厚度) 对裂纹模式的影响.
结论:
- 开发的多物理模型为分析钢筋混凝土腐蚀引起的裂纹提供了强大的框架.
- 这些发现为定量分析,耐久性评估和混凝土结构的保护设计提供了理论工具.
相关概念视频
01:27Corrosion of Reinforcement
252
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
252
01:20Microcracking in Concrete
205
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...
205
01:28Types of Non-structural Cracks in Concrete
244
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
244
01:29Sulfate Attack on Concrete
289
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
Sulfates from sources like soil, groundwater, or industrial effluents...
289
01:21Acid Attack on Concrete
327
When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
The rate at which hydrogen...
The rate at which hydrogen...
327
01:22Effect of Sea Water on Concrete
425
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
Concrete in areas between tide marks,...
425