Collaborative Research: Engineered Water Repellency to Mitigate Frost Susceptibility: Decoupling Osmotic and Matric Potential

合作研究：工程防水性以减轻霜冻敏感性：渗透和基质势的解耦

• 批准号: 1928825
• 负责人: Bora Cetin
• 金额: $ 31.49万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2019-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1928825&HistoricalAwards=false
• 关键词: Collaborative; Research; Engineered; Water; Repellency

Frost heaving has a significant effect on civil infrastructure such as buildings, roads, and bridges. It causes excessive settlement, foundation instability, and even structural failure. This research will investigate the extent to which water repellent additives (e.g., organo silanes) mitigate frost heaving while identifying the controlling physical and chemical mechanisms. This research has the potential to dramatically extend the service life of civil infrastructure while introducing a new approach to soil and foundation improvement. This research provides a basis to extend the concept of engineered water repellency to other areas of geotechnical engineering, including applications in slope stability, road construction, and solid/hazardous waste management. More broadly, this research may enhance our understanding of carbon dioxide emissions from permafrost as it thaws during climate change. The research may also inform our understanding of frost formation on the Earth's Moon, Mars, and other extraterrestrial bodies. This project supports a unique experience for Cadets from the U.S. Military Academy, to be paired with Veterans from both collaborating institutions for an experience at these organizations as well as at the U.S. Army Corps of Engineers Engineer Research and Development Center Cold Regions Research and Engineering Laboratory (ERDC-CRREL) Laboratory in Hanover, New Hampshire. The research team, inclusive of the Principal Investigators, Cadets, Veterans, and Graduate Students will also complete an active-learning based seminar entitled "Leading at the Speed of Trust." This training emphasizes trust and character development; both of which have emerged as critical attributes as the work of engineers intersects the public with mass produced products and mega-sized projects. The primary focus of this research is the relative contribution of osmotic and matric potential on ice lens formation and growth, with and without engineered water repellency. This represents a critical link in the dynamic thermo-hydro-mechanical (THM) system. A secondary focus evaluates the net effect of osmotic and matric potential on these two soil systems (with and without water repellency) as interpreted from direct physical measurements (in the lab and in the field). Multi-physics modeling will supplement this work via parametric and related analyses. The research plan is conceived to follow three phases (1) characterization, (2) performance and (3) model application and field testing. Data from the characterization phase will quantify osmotic/matric potential as a function of water repellency. Experiments in the performance phase will evaluate how varied potential and water repellency affect frost heave and the relationship between frozen and unfrozen water content. The parameters which describe the frozen/unfrozen water content relationship will be modified to reflect the relative contribution of osmotic and matric potential and will then be used in models to predict behavior under a wider set of climatic conditions. These predictions will be compared with field data from four sites (Michigan, New Hampshire, North Carolina, and Alaska) whose frost exposure varies by three orders of magnitude.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.

弗罗斯特·洪（Frost Heaving）对建筑物，道路和桥梁等民用基础设施有重大影响。 它会导致过度解决，基础不稳定甚至结构性故障。 这项研究将调查驱虫剂添加剂（例如有机硅硅质）在确定控制物理和化学机制的同时减轻霜冻量的程度。 这项研究有可能极大地延长民事基础设施的使用寿命，同时引入一种新的土壤和基础改进方法。 这项研究提供了将工程水排斥的概念扩展到岩土工程的其他领域的基础，包括在坡度稳定性，道路建设和固体/危险废物管理方面的应用。 更广泛地说，这项研究可能会增强我们对气候变化期间永久冻土二氧化碳排放的理解。 这项研究还可以告知我们对地球月球，火星和其他外星物体上霜冻形成的理解。 该项目为美国军事学院的学员提供独特的体验，并与两个合作机构的退伍军人以及在这些组织以及美国汉普郡汉诺威市的美国陆军工程师研究与开发中心研究中心研究与工程实验室（ERDC-CRRREL）实验室的美国陆军工程师研究与开发中心冷地研究与工程中心的经验。研究团队包括主要调查员，学员，退伍军人和研究生，还将完成一个基于积极学习的研讨会，名为“以信任的速度领导”。这项培训强调信任和性格发展。随着工程师的工作将公众与大规模生产的产品和大型项目相交，这两者都成为关键属性。这项研究的主要重点是渗透和基质潜力对冰晶晶状体形成和生长的相对贡献，并且有和没有工程水的抑制作用。 这代表了动态热力学（THM）系统中的关键链接。 次要焦点评估了从直接物理测量（在实验室和现场）解释的这两个土壤系统（有和没有水的驱虫）对这两个土壤系统（有和没有水的驱虫）的净效应。 多物理建模将通过参数和相关分析来补充这项工作。研究计划被认为遵循三个阶段（1）表征，（2）性能和（3）模型应用和现场测试。 来自表征阶段的数据将量化渗透/矩阵势与水驱动性的关系。性能阶段的实验将评估各种电势和水的影响如何影响霜冻的膨胀以及冷冻和未水的水含量之间的关系。 描述冷冻/未冻结的水含量关系的参数将被修改以反映渗透和矩阵电位的相对贡献，然后将其用于模型中，以预测在更广泛的气候条件下的行为。 这些预测将与来自四个站点（密歇根州，新罕布什尔州，北卡罗来纳州和阿拉斯加）的现场数据进行比较，它们的霜冻暴露均取决于三个数量级。该奖项反映了NSF的法定任务，并被视为值得通过基金会的知识分子优点和更广泛的影响审查审查标准来通过评估来获得支持。