使用城市固体废物焚烧飞灰作为发泡剂合成基于金属的地聚合物泡材料
Xiang Tian1, Kuizhou Liu1, Xuetong Yang2
1School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Waste management (New York, N.Y.)
|July 8, 2023
概括
城市固体废物焚烧飞灰 (MSWIFA) 可以作为发泡剂用于制造地质聚合物发泡材料 (GFMs). 这些GFM表现出更好的性能,包括更低的导热率和更高的压力强度,使它们适合各种应用.
科学领域:
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
- 化学工程是化学工程的重要组成部分.
背景情况:
- 在城市固体废物焚烧飞灰 (MSWIFA) 中的金属,由于扩张问题,阻碍了其回收成水泥材料.
- 地质聚合物泡材料 (GFMs) 提供了有前途的替代品,具有高温稳定性,低导热性和减少二氧化碳排放.
研究的目的:
- 调查MSWIFA作为合成GFMs的发泡剂的使用情况.
- 分析MSWIFA和稳定剂剂量对GFMs的物理性质,孔隙结构,压力强度和导热率的影响.
主要方法:
- 合成具有不同MSWIFA和稳定剂含量的GFMs.
- 使用物理性质分析,孔隙结构评估,压力强度测试和导热度测量进行表征.
- 通过X射线衍射 (XRD) 和富里叶变换红外光谱法 (FTIR) 进行相变分析.
主要成果:
- 增加MSWIFA含量 (20-50%) 增加了多孔性 (63.5-73.7%) 和减少了散装密度 (890-690 kg/m3).
- 添加稳定剂提炼了细胞结构,增加了多孔性 (69.9-76.8%),并降低了散装密度 (800-620 kg/m3).
- 随着MSWIFA和稳定剂剂量的增加,热导率下降;GFMs在相当的热导率下显示出优越的压力强度.
结论:
- 在GFM合成中,MSWIFA有效地起到泡剂的作用,由H2释放驱动.
- 使用MSWIFA生产的GFM显示出潜在应用的有利特性.
- 加入MSWIFA会改变相位组成和凝结构,而稳定剂主要影响孔隙特性.
相关概念视频
Pozzolans
153
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...
153
Additives and Fillers in Concrete
115
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...
115
Alkali Aggregate Reaction in Concrete
136
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
136
Types of Cement II
137
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
137


