评估由麦体生物炭修改的青粘合剂的风湿性质
Camila Martinez-Toledo1, Gonzalo Valdes-Vidal2, Alejandra Calabi-Floody2
1Engineering Doctoral Program, Universidad de La Frontera, Temuco 4811230, Chile.
Materials (Basel, Switzerland)
|September 14, 2024
概括
来自麦体的生物炭 (BO) 提高了青粘合剂的性能,提高了防腐性和高温粘度. 这种可持续的添加剂还可以提高耐疲劳性和低温性能,优于其他修饰剂.
科学领域:
- 材料科学与工程 材料科学与工程
- 土木工程 土木工程是指土木工程.
- 可持续材料 可持续材料
背景情况:
- 青粘合剂在道路建设中至关重要,但在不同的服务条件下,它们的性能可能会降低.
- 生物炭是一种从生物质热解中获得的可持续材料,显示出改变青粘合剂特性的潜力.
- 了解生物炭特征的影响,如热解温度和颗粒大小,是优化其性能的关键.
研究的目的:
- 为了评估麦体生物炭 (BO) 对PG 64-22青粘合剂的风质性质的影响.
- 研究不同生物炭参数 (热解温度,颗粒大小,含量) 如何影响粘合剂性能.
- 评估BO作为青粘合剂的可持续修饰剂的潜力.
主要方法:
- 采用了全因数设计,可变化热解温度 (300°C,500°C),BO颗粒大小 (<20μm,<75μm) 和BO含量 (2.5%, 5%, 7.5%).
- 使用SEM-EDX和FTIR进行了BO和改性结合剂的物理化学和形态分析.
- 风湿学测试包括原始,短期和长期老化的结合剂的旋转粘度,变参数 (G*/sin) 疲劳参数 (G*·sin) 多重应力爬行恢复 (MSCR) 和曲束风湿学 (BBR).
主要成果:
- 麦体生物炭 (BO300S) 显著提高了结阻力和旋转粘度,其改善与BO含量成比例.
- 低百分比的BO增强了耐疲劳性,超过了石墨粉 (CFG) 和商业活性炭 (CAC).
- 与对照粘合剂相比,改性粘合剂在低使用温度下表现出优异的性能.
结论:
- 麦体生物炭 (BO) 是一种有效的修饰剂,可以提高青粘合剂的高温和低温性能.
- 该研究确定了最佳的BO特性 (300°C热解,小于20微米颗粒大小) 以提高质性质.
- 博为青应用提供了一种可持续和高性能替代传统修饰剂的替代方案.
相关概念视频
Abrasion Resistance of Concrete
114
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...
114
Porosity in Cement Paste
118
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...
118
Additives and Fillers in Concrete
92
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
92
Porosity and Absorption of Aggregate
268
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
268
Hydration of Cement
202
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
202


