Viscoelastic Cementitious Composites for Controlled Damping of Civil Infrastructure

用于民用基础设施受控阻尼的粘弹性水泥基复合材料

• 批准号: 0727143
• 负责人: Zachary Grasley
• 金额: $ 15万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0727143&HistoricalAwards=false
• 关键词: Viscoelastic; Cementitious; Composites; Controlled; Damping

This research proposes to develop techniques and guidelines for designing cementitious materials with superior viscoelastic damping capacity. An analytical modeling framework will be created for guiding the multiscale design of customized, controlled viscoelastic cementitious composites. Based on the analytical models, the new design techniques will utilize strategic integration of materials science and mechanics to optimize damping on multiple length scales. On the nano through microscale, the poromechanical behavior of cementitious materials will be exploited to utilize apparent viscoelastic properties to promote hydraulic damping; this effect is analogous to the mechanism of a shock absorber in that damping will be provided by compressed viscous fluid flowing through small pores. In cementitious materials, the pore fluid will be forced through the designed, interconnected pore network to invoke hydraulic damping. On the millimeter scale, novel viscoelastic inclusions with model driven surface conditioning will be utilized to improve composite damping. Experiments will be performed to measure parameters critical to the analytical models, and to validate the model predicted damping. Critical parameters to measure will include traditional properties such as porosity, pore interconnectivity, and moduli, as well as nontraditional properties such as surface energy.If successful, the results of this research will enable the development of exciting new tailored viscoelastic cementitious composite materials for civil infrastructure applications. The primary role of these new materials will be to serve as integrated energy absorbers to reduce the damage induced by earthquakes, wind, impacts, blasts, and other sources of structural vibrations. The contribution of structural materials to damping may be considerable, owing to the tremendous volume of such materials in a structure. Additionally, this research will result in an overall improvement in the understanding of the behavior of viscoelastic porous solids, phase interaction in composite materials, and fluid-solid material interaction.

本研究提出了设计具有优越粘弹性阻尼能力的胶凝材料的技术和指导方针。一个分析建模框架将创建指导定制，控制粘弹性胶凝复合材料的多尺度设计。基于分析模型，新的设计技术将利用材料科学和力学的战略集成来优化多长度尺度上的阻尼。在纳米到微观尺度上，利用胶凝材料的孔隙力学行为，利用表观粘弹性来促进水力阻尼；这种效果类似于减震器的机制，因为阻尼将由流过小孔隙的压缩粘性流体提供。在胶凝材料中，孔隙流体将被迫通过设计的、相互连接的孔隙网络，从而调用水力阻尼。在毫米尺度上，采用模型驱动表面调理的新型粘弹性包裹体将改善复合材料的阻尼。实验将用于测量对分析模型至关重要的参数，并验证模型预测的阻尼。需要测量的关键参数包括孔隙度、孔隙连通性和模量等传统属性，以及表面能等非传统属性。如果成功，这项研究的结果将使开发令人兴奋的新型定制粘弹性胶凝复合材料用于民用基础设施应用。这些新材料的主要作用将是作为综合能量吸收器，以减少地震、风、冲击、爆炸和其他结构振动源造成的损害。结构材料对阻尼的贡献可能是相当大的，因为这种材料在结构中的体积很大。此外，这项研究将导致对粘弹性多孔固体行为、复合材料中的相相互作用和流固材料相互作用的全面理解。