Development of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) for bridge infrastructure applications

开发用于桥梁基础设施应用的超高性能纤维增强混凝土 (UHPFRC)

• 批准号: 478624-2015
• 负责人: Sennah, Khaled
• 金额: $ 0.36万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Engage Plus Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=579671
• 关键词: Development; Ultra; Performance; Fiber; Reinforced

There is a growing need for durable and resilient prefabricated bridge systems which facilitate rapid completion of on-site activities in order to minimize the impact on the travelling public. Prefabricated bridges can provide higher quality, accelerated, and safer construction; however, greater offsite prefabrications of bridge components necessitates an increased reliance on the long-term performance of field-installed connections between these components. Research on the materials between precast bridge components has emerged in the last decade. Ultra-high performance concrete (UHPC) whose mechanical and durability properties far exceed those of conventional concretes present the opportunity to significantly enhance the performance of these field-applied connections, thus facilitating the wider use of prefabricated bridge deck systems. Of particular interest here, UHPCs can exhibit exceptional bond when cast against previously cast concrete and can significantly shorten the development length of embedded discrete bars into the precast joints. More recently, the concept of using the properties of UHPC to redesign the connections between prefabricated bridge components has been recognized in North America. Field-cast UHPC connections between prefabricated bridge components have now been implemented in few bridges in Canada and U.S. However, research is need to develop UHPC to increase market competitiveness that will reflect on optimizing spending tax payers' money in Canada's bridge infrastructure. This project is a continuation of a recent NSERC Engage grant to further optimize the design of UHPC mix and extend it to include steel fibers in the mix (UHPFRC) for enhanced strength and durability.

越来越需要耐用和有弹性的预制桥梁系统，以便快速完成现场活动，以尽量减少对旅行公众的影响。预制桥梁可以提供更高质量、更快、更安全的施工；然而，更多的桥架组件的非现场预制需要增加对这些组件之间现场安装连接的长期性能的依赖。预制桥梁构件间材料的研究是近十年来兴起的。超高性能混凝土（UHPC）的机械性能和耐久性远远超过传统混凝土，为显著提高这些现场应用连接的性能提供了机会，从而促进了预制桥面系统的广泛使用。这里特别感兴趣的是，当浇筑在先前浇筑的混凝土上时，uhpc可以表现出特殊的粘结性