人工岩石和新鲜的砂之间的时间依赖的界面粘附被纳米粘土修改
Xiaoyun Wang1,2, Kim Van Tittelboom2, Jiaolong Zhang1,3
1College of Civil Engineering, Tongji University, Shanghai 200092, China.
Nanomaterials (Basel, Switzerland)
|May 10, 2024
概括
将纳米粘土添加到新鲜的砂中显著改善了与岩石的时间依赖的界面粘附,这对于防止道层故障至关重要. 这种增强对于推进地下建筑中的混凝土印刷至关重要.
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.
- 地质技术工程 地质技术工程
背景情况:
- 岩石和新鲜砂之间的时间依赖的界面粘附对于成功地在道层中打印混凝土至关重要.
- 粘附失败可能是由于对这种不断发展的键的理解不足而发生的.
- 纳米粘土显示出增强这种界面粘附的潜力.
研究的目的:
- 为了研究人造岩石和纳米粘土修饰的新鲜砂之间的时间依赖的界面粘附.
- 量化纳米粘土对界面强度和故障模式的影响.
- 了解纳米粘土对粘附演变的影响背后的机制.
主要方法:
- 使用快速接测试和快速剪切测试来测量界面强度.
- 采用异热热量计来研究水化动力学.
- 在不同的休息时间和纳米粘土度下分析了故障模式.
主要成果:
- 纳米粘土的添加大大增加了界面上的最大拉伸和剪切应力.
- 0.3%的纳米粘土度导致界面强度显著增加 (1分钟时106%,32分钟时209%).
- 观察到一个两阶段的粘附进化:快速的初始增长,随后是线性,持续的增长,纳米粘土加速了速度.
结论:
- 纳米粘土有效地增强了砂和岩石之间的时间依赖的界面粘附,减轻了粘附失效的风险.
- 改善的粘附性归因于纳米粘土对花和加快水分的作用.
- 纳米粘土促进了由于矩阵硬化而从柔性到脆性故障模式的过渡,这表明了更强的键.
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