I-Corps: Sustainable Infrastructure Rehabilitation

I-Corps：可持续基础设施修复

• 批准号: 1445267
• 负责人: Victor Li
• 金额: $ 5万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1445267&HistoricalAwards=false
• 关键词: Corps; Sustainable; Infrastructure; Rehabilitation

The alarming condition of civil infrastructures in the US has been well documented. It has also been documented that about 50% of current repairs in the field fail, requiring costly re-repairs. Beyond economics, repeated repairs pose a high cost to the environment and to transportation mobility. Repair failure can be traced to the brittleness of repair mortars and their tendency to delaminate from the substrate. In this project, the team proposes a ductile fiber reinforced cement based composite that suppresses brittle fracture and delamination, and that can undergo self-healing, when damaged. This material, once applied, can permanently protects the original infrastructure and extend its service life. By introducing an engineered cementitious composite (ECC) material into the civil infrastructure industry, the tam expects broad impacts on a number of fronts. These include lowering lifecycle costs of infrastructure maintenance, enhancing user mobility on transportation infrastructure, and reducing environmental costs and impacts caused by the construction and repeated repairs of civil infrastructure. The proposed team has developed ECCs with different functionalities, including lightweight, low stiffness, and self-healing ECC. Lightweight ECC has a density about 40% that of normal concrete. This translates directly to a reduced pavement slab weight by the same percentage, transport cost from precast yard to construction site, and hoisting machine capacity requirement during installation. Recently, a low E-stiffness ECC was developed using recycled tire-rubber in place of rigid aggregates in ECC. This material stiffness reduction translates into a slab stiffness reduction by the same percentage. Self-healing translates into a unique zero-maintenance feature for next-generation pavement slabs.

美国民用基础设施的令人震惊的状况已得到充分记录。 还记录在该领域中约有50％的维修失败，需要昂贵的重新修复。 除了经济学之外，重复维修对环境和运输流动性构成了很高的成本。 维修故障可以追溯到修复迫击炮的脆弱性及其与基板分配的趋势。 在这个项目中，团队提出了一个延性纤维增强水泥的复合材料，可抑制脆性断裂和分层，并在损坏时会进行自我修复。该材料一旦应用，就可以永久保护原始基础设施并延长其使用寿命。通过将工程化的水泥复合材料（ECC）材料引入民用基础设施行业，TAM期望对许多方面产生广泛的影响。其中包括降低基础设施维护的生命周期成本，增强对运输基础设施的用户流动性，以及降低了由民用基础设施的施工和重复维修造成的环境成本以及影响。拟议中的团队开发了具有不同功能的ECC，包括轻巧，低刚度和自我修复ECC。轻型ECC的密度约为正常混凝土的40％。这直接转化为相同百分比的路面平板重量，从预制码到建筑工地的运输成本以及安装过程中的机器容量需求。最近，使用回收的轮胎橡胶代替ECC中的刚性骨料开发了低E-STIFFENS ECC。这种材料刚度的降低将平板刚度降低相同的百分比。自我修复转化为下一代路面板的独特零维护功能。