I-Corps: Impact of extended time on fresh concrete and durability

I-Corps：延长时间对新拌混凝土和耐久性的影响

• 批准号: 2024183
• 负责人: Mohamed Mahgoub
• 金额: $ 5万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2022-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2024183&HistoricalAwards=false
• 关键词: Corps; Impact; extended; time; fresh

The broader impact/commercial potential of this I-Corps project is the development of a type of concrete that reduces waste. More than one billion cubic yards of ready-mix concrete produced in the United States is returned to concrete plants every year. Much of this concrete is discarded as waste or washed out to reclaim the aggregates used in the system. This waste results in hardened concrete in landfills, contaminated washout water, and increased greenhouse gases. Reducing this may significantly improve sustainability by preventing unnecessary material in the landfill and reducing use of scarce water resources for washing, as well as improving operating costs. Furthermore, the main reason for truck rejections of concrete every year is due to the strict adherence to the 90-minute time limit. The technology is a concrete additive that allows mixed concrete to “sleep” to preserve the quality. This I-Corps project is based on the development of an improved concrete formula to allow extended mixing times without negatively impacting long-term durability. As traffic and road congestion has gotten progressively worse, this rule has unnecessarily increased construction cost and waste concrete. The proposed technology may extend mixing times by up to 150 minutes without negatively impacting the long-term durability of concrete mixtures. Recent studies examined hardened concrete properties such as compressive strength, freeze-thaw, and surface resistivity and indicate that the discharge time had no significant impact on the fresh properties, surface resistivity, and freeze-thaw durability up to 150 minutes. This technology may improve discharge time limits and extend specifications.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.

这个I-Corps项目的更广泛的影响/商业潜力是开发减少废物的混凝土。每年在美国生产的十亿立方码的现成混凝土将返回混凝土植物。这些混凝土的大部分被丢弃为废物，或被冲洗给系统中使用的骨料。这种浪费会导致垃圾填埋场，被污染的冲洗水和增加温室气体的硬化混凝土。通过防止垃圾填埋场中不必要的材料，减少稀缺水资源来洗涤以及提高运营成本，可以大大改善可持续性。此外，每年卡车拒绝混凝土的主要原因是由于严格遵守90分钟的时间限制。该技术是一种混凝土添加剂，可允许混合混凝土“睡眠”以保持质量。这个I-Corps项目基于改进的混凝土公式的开发，以允许长期混合时间而不会对长期耐用性产生负面影响。随着交通和道路交通拥堵的逐渐变得更糟，该规则不必要提高建筑成本和废物混凝土。提出的技术可能会将混合时间延长长达150分钟，而不会对混凝土混合的长期耐用性产生负面影响。最近的研究检查了硬化的混凝土特性，例如抗压强度，冻融和表面耐药性，并表明排放时间对新鲜性能，抗体耐药性和冻融耐用性无显着影响，最高可达150分钟。该技术可能会改善排放时间限制并扩展规格。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来评估，被认为是珍贵的支持。