飞灰直接转化为具有强大的绝热和耐火性能的单体复合气凝
Ke Zhang1, Dahao Liu1, Jie Wang1
1Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy & Power Engineering, Dalian University of Technology, Dalian 116024, China.
Waste management (New York, N.Y.)
|December 27, 2025
概括
本研究介绍了一种无化学物质的方法来制造高性能飞灰气凝. 这些新型材料提供出色的绝热和耐火性,使可持续的废物管理和高价值的飞利用成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
- 纳米技术 纳米技术
背景情况:
- 飞是全球主要的固体废物挑战,原因是大量的生产量.
- 使用飞灰制成高价值产品,如气凝是可取的,但由于颗粒大小,很难.
- 微米大小的飞灰颗粒阻碍了稳定的分散和单体多孔结构的形成.
研究的目的:
- 开发一种可扩展的,无化学物质的战略,用于将飞灰转化为高性能气凝.
- 为了实现复合气凝中的高飞灰含量,同时保持结构完整性和性能.
- 探索飞废弃物的高价值利用潜力.
主要方法:
- 开发了一种无化学物质的方法,用于直接将飞灰转化为气凝.
- 利用低维纳米粘土,为稳定的飞灰分散提供固态障碍.
- 采用最小的聚合物添加剂来创建一个坚固的粘土网络,防止孔隙崩.
主要成果:
- 创建的单立体复合气凝含有高达75%重量%的飞灰含量和>90%的多孔性.
- 实现了优异的绝热 (0.03340.0385 W/(m·K)) 和优异的耐火性 (高达 ~ 1300 °C).
- 证明了高压力强度 (高达2.7MPa在80%的应变下) 和结构完整性.
结论:
- 一种可扩展的,无化学物质的方法有效地将飞灰转化为高性能气凝.
- 开发的气凝提供了保温,机械强度和热稳定的平衡.
- 这种方法为飞废弃物的高价值利用提供了最佳策略.
相关概念视频
Pozzolans
445
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...
445
Additives and Fillers in Concrete
304
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...
304
Accelerated Curing of Concrete
421
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
421
Fiber Reinforced Concrete
306
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...
306
Mass Concreting
291
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
291
Composite Masonry Walls
1.6K
Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
1.6K


