对TPU/SBR复合材料改性青的微观机制和性能进行研究
Li Wei1, Linxianzi Li2, Mingmei Liang2
1College of Architecture and Civil Engineering, Nanning University, Nanning 541699, China.
Polymers
|October 16, 2024
概括
这项研究通过结合热塑性聚氨 (TPU) 和 styrene-butadiene (SBR) 来增强青路面. 复合材料改造提高了高温稳定性,低温柔性和整体使用寿命.
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.
- 聚合物科学 聚合物科学
背景情况:
- 传统的青路面遭受高温和低温裂纹,限制其使用寿命.
- 使用聚合物对青的复合修改是解决这些性能限制的关键策略.
- 热塑性聚氨 (TPU) 和 styrene-butadiene (SBR) 正在研究它们提高青性能的潜力.
研究的目的:
- 研究使用热塑性聚氨 (TPU) 和 styrene-butadiene (SBR) 的矩阵青的复合修饰.
- 分析改性青的宏观和微观结构性质.
- 确定TPU和SBR的最佳剂量,以提高青性能.
主要方法:
- 在改造前和改造后对传统青性能进行宏观视角分析.
- 微观结构,相结构和修改机制的微观分析.
- 评估青性能,包括高温稳定性,低温柔性和储存稳定性.
主要成果:
- 用TPU修饰的青显示出更好的高温性能,储存稳定性和弹性回收.
- 经过SBR修改的青表现出增强的低温柔性,但随着剂量增加,储存稳定性降低.
- 确定最佳剂量为TPU的15%和SBR的3.5%.
结论:
- 使用TPU和SBR的复合材料修改在青中创建了一个稳定的交叉连接网络结构.
- TPU有助于化学修饰甚至组件分布,而SBR提供物理修饰.
- 结合的物理和化学增强导致了青路面的优越整体性能和延长使用寿命.
相关概念视频
Abrasion Resistance of Concrete
107
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...
107
Microcracking in Concrete
104
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...
104
Toughness and Hardness of Aggregate
248
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
248
Superplasticizers
81
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
81
Effects of Air-entrainment in Concrete
80
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
80
Tensile Strength Considerations of Concrete
117
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
The dimensions and shape of a concrete specimen...
117


