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担忧的状况已经有据可查。 也有记录表明，目前在现场进行的维修约有50%失败，需要昂贵的重新维修。 除了经济上的原因，重复的维修对环境和运输流动性造成了很高的成本。 修补失败可以追溯到修补砂浆的脆性和它们从基底上分层的倾向。 在这个项目中，该团队提出了一种韧性纤维增强水泥基复合材料，可以抑制脆性断裂和分层，并且在损坏时可以自我修复。这种材料一旦应用，可以永久保护原有基础设施，延长其使用寿命。通过将工程水泥复合材料（ECC）引入民用基础设施行业，tam预计将在多个方面产生广泛影响。这些措施包括降低基础设施维护的生命周期成本，提高交通基础设施的用户流动性，减少民用基础设施的建设和重复维修造成的环境成本和影响。拟议的团队开发了具有不同功能的ECC，包括轻量化，低刚度和自我修复ECC。轻质ECC的密度约为普通混凝土的40%。这直接转化为减少相同百分比的路面板重量，从预制场到施工现场的运输成本，以及安装期间的起重机容量要求。最近，开发了一种低E刚度ECC，其使用再生轮胎橡胶代替ECC中的刚性骨料。这种材料刚度降低转化为相同百分比的板刚度降低。自我修复转化为下一代路面板独特的零维护功能。