在冷解周期下,化学结合酸盐陶水泥的性能演变和降解机制
Bo Pang1, Runqing Liu2, Yuanquan Yang2
1School of Civil Engineering, Liuzhou Institute of Technology, Liuzhou 545616, China.
Materials (Basel, Switzerland)
|December 11, 2025
概括
化学结合酸盐陶 (CBPC) 水泥的耐用性随着冷解周期而降低. 性能最初有所改善,然后下降,显示微裂变和强度降低,特别是在盐水环境中.
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.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 化学结合酸盐陶 (CBPC) 水泥是各种应用的有希望的材料.
- 了解其在环境压力下的长期耐用性对于可靠的性能至关重要.
- 冷解周期对水泥材料的完整性构成重大挑战.
研究的目的:
- 研究CBPC水泥在水和NaCl溶液中的冷解周期下的降解机制.
- 分析循环对机械性能,质量,相组合和微观结构的影响.
- 阐明微观结构演变与宏观性能变化之间的关系.
主要方法:
- 暴露CBPC水泥样品在水和3%NaCl溶液中的不同数量的冷解周期.
- 测量压力强度,质量损失率,外部pH值和离子度.
- 使用XRD/Rietveld分析相组合,通过TG/DTG分析热特性,使用FTIR分析化学结构.
主要成果:
- CBPC水泥初步增加,随后质量和压力强度下降,冷-解周期增加.
- 在400个循环后,压力强度在水中降低了29.91%,在3%的NaCl溶液中降低了25.16%.
- 降解导致MgKPO4·6H2O含量降低,结晶性降低,微裂变增加,离子度改变.
结论:
- 冷-解循环诱导CBPC水泥的显著降解,导致机械性能降低和微观结构损坏.
- NaCl溶液的存在影响了降解途径和离子漏行为.
- 微结构变化,包括微裂变和相变,与观察到的宏观性能恶化直接相关.
更多相关视频
10:41The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation
Published on: July 18, 2018
16.0K
07:42Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
690
相关概念视频
Frost Resistant Concrete
353
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
353
Frost Action on Concrete
376
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
This freeze-thaw cycle primarily causes surface scaling, where...
376
Strength and Heat of Hydration
622
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
622
Unsoundness of Aggregate due to Volume Change
336
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
336
Creep in Concrete
1.1K
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...
1.1K
Brick Durability, Strength, and Appearance
608
Brick durability, strength, and appearance are crucial factors in construction, influencing the choice of bricks for specific applications. The process of freeze-thaw, for instance, significantly affects brick durability. This phenomenon occurs when water absorbed by a brick expands as it freezes, potentially causing damage when it melts and refreezes. Bricks are graded for durability: SW-grade bricks are the most durable, offering high strength and low water absorption, followed by MW-grade...
608
