CAREER: Increasing the Effectiveness of Mineral Additives in Concrete Through Novel Particle Characterization

职业：通过新型颗粒表征提高混凝土中矿物添加剂的有效性

• 批准号: 1150404
• 负责人: M. Tyler Ley
• 金额: $ 40万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-01 至 2018-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1150404&HistoricalAwards=false
• 关键词: CAREER; Increasing; Effectiveness; Mineral; Additives

This Faculty Early Career Development (CAREER) project will develop a strong research program to increase the use of supplementary cementitious materials (SCMs) as construction binders in concrete through new levels of chemical characterization. Since SCMs are unwanted material streams from different industrial processes, there is much variability in the materials. The research will use novel particle characterization techniques developed by the PIs research group to better understand, quantify, improve and increase the use of SCMs as construction binders. The objectives are: i) characterize SCMs by coupling particle size and chemistry, through 3D particle chemical mapping, rapid investigation with autonomous scanning electron microscopy, and bulk chemistry, ii) quantify the short term and long term performance of SCMs as concrete binders through strength, permeability, chemical shrinkage and heat of hydration changes over time, iii) understand the mechanisms by which different chemical phases in the SCM impact performance as a concrete binder. Concrete is the second most used commodity in the world. The use of SCMs in concrete has the ability to improve the strength, durability, economy and sustainability of concrete. Current use of SCMs in concrete is limited because of the high variability of the material. This research will provide new fundamental knowledge of chemical phases, their distribution, and how these phases react with hydrating cement paste. Ultimately these interactions will be used to understand how this impacts the properties and performance of the concrete containing the SCM from a few hours to over a year. Furthermore, the techniques established in this research will be useful for a number of applications that require complex particle characterization and allowing time resolved measurements of their reactions and structural changes in different environments. These methods can be applied to biomaterials, pharmaceuticals, geo-materials, polymers, industrial waste products. The educational activities will also increase the awareness level of STEM fields with underrepresented elementary students through the establishment of an after school mentoring program and the creation of online teaching modules.

该教师早期职业发展（CAREER）项目将开发一个强大的研究计划，通过新的化学表征水平，增加补充胶凝材料（SCM）在混凝土中作为建筑粘合剂的使用。 由于SCM是来自不同工业过程的不需要的材料流，因此材料中存在很大的可变性。 该研究将使用PI研究小组开发的新型颗粒表征技术，以更好地理解，量化，改进和增加SCM作为建筑粘合剂的使用。 其目标是：ii）通过强度、渗透性、化学收缩和水化热随时间的变化来量化SCM作为混凝土粘合剂的短期和长期性能，iii）了解SCM中不同化学相作为混凝土粘结剂影响性能的机制。 混凝土是世界上使用量第二大的商品。 在混凝土中使用SCM能够提高混凝土的强度、耐久性、经济性和可持续性。 由于材料的高度可变性，目前在混凝土中使用SCM是有限的。 本研究将为水泥浆体水化过程中的化学相、化学相的分布以及化学相与水泥浆体的反应提供新的基础知识。 最终，这些相互作用将用于了解这如何影响包含SCM的混凝土的性能和性能，从几个小时到一年多。 此外，在这项研究中建立的技术将是有用的一些应用程序，需要复杂的颗粒表征，并允许在不同的环境中的反应和结构变化的时间分辨测量。 这些方法可应用于生物材料、药物、地质材料、聚合物、工业废弃物。 教育活动还将通过建立课后辅导计划和创建在线教学模块，提高代表性不足的小学生对STEM领域的认识水平。