用隔热添加剂修改的地质聚合物增强耐火性
Maja Kępniak1, Jakub Zabawski1, Piotr Prochoń1
1Department of Building Materials Engineering, Faculty of Civil Engineering, Warsaw University of Technology, Armii Ludowej 16, 00-637 Warsaw, Poland.
Materials (Basel, Switzerland)
|October 16, 2024
概括
添加多孔材料可以增强地质聚合物的耐火性. 使用超声波脉冲速度 (UPV) 的非破坏性测试有效地测量了这些改进的地质聚合物复合材料的热诱导损伤.
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.
- 地质聚合物化学 地质聚合物化学
背景情况:
- 地质聚合物是先进的无机结合剂,具有用于高温应用的潜力.
- 之前的研究探讨了各种添加剂,如飞灰,甲考林和热带石,以增强地质聚合物的特性.
- 了解多孔隔热材料对地聚合物耐火性的影响对于结构应用至关重要.
研究的目的:
- 研究多孔添加剂对地质聚合物的耐火性和压力强度的影响.
- 评估非破坏性测试,特别是超声波脉冲速度 (UPV) 的有效性,以评估改性地质聚合物的热诱导损伤.
- 为了确定UPV测量和热暴露后剩余压力强度之间的相关性.
主要方法:
- 地质聚合物样本用多孔隔热材料进行了修改.
- 样品经过控制的高温测试 (400°C,658°C,800°C) 进行了不同时间的测试.
- 在热暴露之前和之后进行了压力强度测试和超声波脉冲速度 (UPV) 测量.
主要成果:
- 压力强度和UPV随着温度的增加而显著下降,在800°C时显著下降.
- 经过修改的地质聚合物在高温暴露后保留了30%至60%的压力强度,与未经修改的样本分解不同.
- 在UPV值和剩余压力强度之间观察到很强的相关性,这表明UPV在损害评估方面的潜力.
结论:
- 添加多孔材料,即使有密集的无形矩阵,也提高了地质聚合物的耐火性.
- 通过UPV进行非破坏性测试是评估火灾暴露后地质聚合物的结构完整性的可行方法.
- 这些发现支持在易燃环境中使用改性地质聚合物,并强调UPV在火灾后结构评估中的实用性.
相关概念视频
01:22Thermal Insulation in Masonry Walls
107
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
107
01:29Additives and Fillers in Concrete
91
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...
91
01:22Fiber Reinforced Concrete
71
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
71
01:21Pozzolans
102
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
102
01:30Superplasticizers
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
01:21Masonry in Cold and Hot Weather Conditions
80
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
80