BRIGE: In-situ Characterization of Fresh-state Microstructure in Cementitious Materials: Impact of Aggregation Kinetics, Rheology and Hydration

BRIGE：胶凝材料新鲜状态微观结构的原位表征：聚集动力学、流变学和水化的影响

• 批准号: 0927353
• 负责人: Raissa Ferron
• 金额: $ 17.47万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927353&HistoricalAwards=false
• 关键词: BRIGE; situ; Characterization; Fresh; state

The research objective of this BRIGE award are to (1) characterize the fresh state microstructure of portland cement paste, (2) identify key factors linking the fresh state microstructure and rheological material functions, and (3) test the hypothesis that the aggregation mechanisms and morphology of the hydration products are impacted by shear-induced forces. Key to the success of the project is quantitative measurements of the fresh state microstructure. An advanced experimental method that enables in-situ particle size measurements will be used to characterize the fresh state microstructure. A kinetics-based model will be used to determine the aggregation mechanisms and disaggregation mechanisms. If successful, the results of this research will advance the understanding of the rheological behavior of portland cement-based materials. From this work fundamental information on structure-property relationships of cement paste suspensions will be gained. This information can be used as a knowledge base to help predict how changes in the fresh state microstructure would impact the flow behavior and mechanical development cementitious composites. The results of this work are critical to the discovering of new applications for cementitious materials and for the development of high performance concrete with adapted rheology. The approach proposed in this work could be used to characterize the microstructure of other particulate suspensions, such as drilling fluids, papermaking slurries, sewage sludge. Integrated into this project are education initiatives aimed at broadening the participation of underrepresented groups, especially females, in engineering. The research and educational plan in this BRIGE proposal promotes an improved understanding of cement-based materials and civil engineering through research, teaching, learning, and training.

该 BRIGE 奖项的研究目标是 (1) 表征波特兰水泥浆体的新鲜状态微观结构，(2) 确定连接新鲜状态微观结构和流变材料功能的关键因素，以及 (3) 检验聚集机制和流变材料功能的假设。水合产物的形态受到剪切力的影响。 该项目成功的关键是新鲜状态微观结构的定量测量。 将使用能够进行原位粒度测量的先进实验方法来表征新鲜状态的微观结构。 基于动力学的模型将用于确定聚集机制和分解机制。 如果成功，这项研究的结果将增进对波特兰水泥基材料流变行为的理解。 从这项工作中，可以获得有关水泥浆悬浮液的结构-性能关系的基本信息。 该信息可用作知识库，帮助预测新鲜状态微观结构的变化将如何影响水泥复合材料的流动行为和机械发展。这项工作的结果对于发现水泥材料的新应用以及开发具有适应性流变学的高性能混凝土至关重要。 这项工作中提出的方法可用于表征其他颗粒悬浮液的微观结构，例如钻井液、造纸浆料、污水污泥。 该项目纳入了教育举措，旨在扩大代表性不足的群体，特别是女性在工程领域的参与。该 BRIGE 提案中的研究和教育计划通过研究、教学、学习和培训促进对水泥基材料和土木工程的更好理解。