I-Corps: ULTRA HIGH PERFORMANCE CONCRETE USING A SUSTAINABLE MATERIAL

I-Corps：使用可持续材料的超高性能混凝土

• 批准号: 2223980
• 负责人: Srinivas Allena
• 金额: $ 5万
• 依托单位: Cleveland State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-05-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2223980&HistoricalAwards=false
• 关键词: Corps; ULTRA; PERFORMANCE; CONCRETE; USING

The broader impact/commercial potential of this I-Corps project is the development of an advanced concrete material: ultra-high-performance concrete (UHPC) that is durable and able to resist chemical and environmental distress. With the use of this material, the average life span of our nation’s transportation infrastructure may be significantly extended. UHPC has potential value because it is designed with superior mechanical strength, ductility, post-cracking behavior, and longer-term durability. UHPC may be used in applications for prefabricated bridge elements, pile cap closure pores, bridge deck overlays and repairs, and as a grout for bridge shear keys. In addition, the UHPC formulation may be produced on the job site by local contractors using local materials that will meet both state departments of transportation and federal highway administration specifications. This I-Corps project is based on the development of ultra-high-performance concrete (UHPC) using local materials and industrial by-products such as coal ash, steel slag, and limestone powder. This material has been shown to exhibit superior mechanical strength and longer-term durability. UHPC’s use in the United States may be limited due to its high cost. The cost of UHPC may be reduced, and its durability and sustainability improved, by using local materials reducing cement, silica fume, steel fiber, and fine sand contents. Cement and silica fume contents may be reduced by using fly ash and ground granulated blast furnace slag (GGBS) as supplementary cementitious materials (SCMs). The use of these SCMs reduces the cost and results in eco-efficient UHPC. The laboratory results obtained so far indicate that the proposed material is comparable with currently available products in terms of compressive and tensile strengths and durability properties: resistance to rapid freeze-thaw cycles, resistance to chloride ion penetration, and resistance to sulfate attack. The rapid chloride ion permeability testing results showed that the proposed UHPC has negligible chloride ion ingress, while the material exhibited excellent resistance to rapid freeze-thaw cycles and sulfate attack.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

I-Corps项目更广泛的影响/商业潜力是开发一种先进的混凝土材料：超高性能混凝土(UHPC)，它经久耐用，能够抵抗化学和环境污染。随着这种材料的使用，我国交通基础设施的平均寿命可能会显著延长。超高性能混凝土具有潜在的价值，因为它的设计具有优越的机械强度、延性、开裂后性能和较长期的耐久性。超高性能混凝土可用于预制桥梁构件、承台合龙孔、桥面铺装和维修，以及用作桥梁剪力键的灌浆。此外，超高性能混凝土配方可由当地承包商在工作现场使用符合州交通部和联邦公路管理局规范的当地材料生产。这个i-Corps项目是基于使用当地材料和工业副产品(如火山灰、钢渣和石灰石粉)开发超高性能混凝土(UHPC)。这种材料已被证明具有优异的机械强度和更长期的耐用性。超高性能混凝土在美国的使用可能会受到限制，因为它的成本很高。通过使用当地减少水泥、硅灰、钢纤维和细砂含量的材料，可以降低超高性能混凝土的成本，提高其耐久性和可持续性。利用磨细矿渣和磨细矿渣作为辅助胶凝材料可以降低水泥和硅灰的掺量。这些SCM的使用降低了成本，并产生了具有生态效益的超高性能碳化物。到目前为止获得的实验室结果表明，在压缩和拉伸强度以及耐久性方面，建议的材料与现有产品相当：耐快速冻融循环、抗氯离子渗透和抗硫酸盐侵蚀。快速氯离子渗透性测试结果表明，拟议的超高性能混凝土的氯离子渗透可以忽略不计，而材料表现出优异的抗快速冻融循环和硫酸盐侵蚀的能力。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。