A Study of the Binding Mechanisms of Fly-Ash in Foundry Sands

铸造用砂中粉煤灰的结合机理研究

• 批准号: 9802198
• 负责人: S.K. Kawatra
• 金额: $ 24.52万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802198&HistoricalAwards=false
• 关键词: Study; Binding; Mechanisms; Fly; Ash

9802198 Kawatra Fly ashes produced by the new low-NOx coal combusters contain high concentrations (6% by weight) of unburned carbon, making them less usable as concrete additives because of the adsorptive properties of the carbon. The objective of this research is to better understand the behavior of fly-ash in binder applications, to use this information to determine methods for controlling the kinetics of the binding reaction and to optimize fly-ash binder characteristics for particular industrial applications. Such knowledge and understanding could lead to the economic use of fly-ash as binders, in foundry sands, for example. Specific questions to be answered by this research are as follows:1. What are the effects of fly-ash composition on binder properties?2. What are the properties of particulates which will affect both their interaction with fly-ash binders and their utilization by industry?3. What are the details of the fly-ash binding mechanism and how can binding be optimized?4. How can the behavior of fly-ash based binders be optimized for various industrial applications?Successful use as binders would not only reduce the volume of materials requiring disposal, but would reduce the use of other materials used as binders. Therefore pollution prevention would be realized by waste recovery and reuse. ***

9802198 Kawatra新的低氮氧化物煤燃烧器产生的飞灰含有高浓度（6重量%）的未燃烧碳，由于碳的吸附性能，使其不太可用作混凝土添加剂。本研究的目的是更好地了解粉煤灰在粘结剂应用中的行为，利用这些信息来确定控制粘结反应动力学的方法，并优化粉煤灰粘结剂的特性，以适应特定的工业应用。这种知识和理解可以导致经济地使用粉煤灰作为粘合剂，例如在铸造砂中。本研究所要回答的具体问题如下：1.粉煤灰成分对胶凝材料性能有哪些影响？2.颗粒物的哪些特性会影响它们与粉煤灰粘合剂的相互作用以及它们在工业上的利用？3.粉煤灰粘结机理的细节是什么？如何优化粘结？4.如何优化粉煤灰基粘结剂的性能，以适应各种工业应用？成功地用作粘合剂不仅会减少需要处置的材料的数量，而且会减少用作粘合剂的其他材料的使用。 因此，通过废物的回收和再利用可以实现污染防治。***