在不同几何形状的断裂中,水泥的非线性流动特性
Xifeng Li1, Weiquan Zhao2, Jinjie Zhang1
1State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China.
Scientific reports
|December 8, 2025
概括
这项研究揭示了水泥泥如何形成.
科学领域:
- 地质技术工程 地质技术工程
- 岩石机械学 岩石机械学
- 流体动力学 流体动力学
背景情况:
- 粘接对于加强破碎的岩石质量至关重要.
- 了解水泥料在断裂中的非牛顿流动是有效料的关键.
- 断裂几何学显著影响泥的透和强化.
研究的目的:
- 系统地研究在拉力和剪切断裂中水泥的非线性流动行为.
- 分析断裂几何学 (孔径,粗度,结构) 对料流动的影响.
- 为优化接设计提供理论见解.
主要方法:
- 理论分析和数值模拟.
- 姆-帕帕纳斯塔西乌模型用于学框架的应用.
- 使用修改后的福克海默方程和非达西系数进行评估.
主要成果:
- 断裂粗性增加了流动异质性,特别是在剪切断裂中.
- 混凝土粘合物显示由于产量压力而导致的道化,而不是水.
- 由于产量和惯性力,在高流速下观察到的非线性流体现象.
结论:
- 泥土流通过产量压力,粘性和惯性阶段演变.
- 确定了两种骨折类型的临界雷诺兹数 (Rec).
- 这些发现有助于优化破碎岩石质量的接设计参数.
更多相关视频
06:27Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
Published on: September 23, 2018
9.7K
10:06Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs
Published on: July 2, 2020
7.2K
相关概念视频
01:18Porosity in Cement Paste
423
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
The balance of water to cement in the mix is...
423
01:23Pore Size Distribution
416
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Adequate...
416
01:28Types of Non-structural Cracks in Concrete
459
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.
459
01:20Microcracking in Concrete
413
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...
413
01:23Behavior of Concrete Under Compressive Load
557
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
557
01:12Flow Table Test
611
The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...
611