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)

基本信息

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

项目摘要

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.

人们越来越需要耐用且有弹性的预制桥梁系统，以促进现场活动的快速完成，以尽量减少对出行公众的影响。装配式桥梁可以提供更高质量、更快、更安全的施工；然而，更多的桥梁部件的场外预制需要更多地依赖这些部件之间现场安装的连接的长期性能。过去十年出现了对预制桥梁构件之间材料的研究。超高性能混凝土（UHPC）的机械性能和耐久性能远远超过传统混凝土，为显着提高这些现场应用连接的性能提供了机会，从而促进预制桥面系统的更广泛使用。这里特别令人感兴趣的是，UHPC 在与先前浇筑的混凝土浇筑时可以表现出卓越的粘合力，并且可以显着缩短了预制接头中嵌入离散钢筋的开发长度。最近，利用 UHPC 的特性重新设计预制桥梁组件之间的连接的概念已在北美得到认可。预制桥梁组件之间的现场铸造 UHPC 连接现已在加拿大和美国的少数桥梁中实施。然而，需要研究开发 UHPC 以提高市场竞争力，这将反映在加拿大桥梁基础设施上优化纳税人的资金支出。该项目是最近 NSERC Engage 拨款的延续，旨在进一步优化 UHPC 混合物的设计，并将其扩展到在混合物中包含钢纤维 (UHPFRC) 增强强度和耐用性。