Mechanistic Studies of Asphalt Aging Aimed at the Discovery of Anti-aging Additives

沥青老化机理研究旨在发现抗老化添加剂

• 批准号: RGPIN-2018-03730
• 负责人: Hesp, Simon
• 金额: $ 4.23万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=747898
• 关键词: Mechanistic; Studies; Asphalt; Aging; Aimed

Asphalt pavements constructed for municipal, provincial and national agencies today rarely last as long as they did 25 years ago. Some regions have seen lifespans shrink by as much as 50-60% (Annual Report, Auditor General of Ontario, 2016), largely due to poor practices and materials. The decline is due to heavier traffic, anomalous weather (extreme summer/winter temperatures), lack of knowledge among agency staff leading to the use of inadequate specifications, and the “greening” of our roads through the incorrect and/or irresponsible use of certain recycled materials. Across Canada, ~$120 billion-worth of roads are in fair, poor or very poor state (Canadian Infrastructure Report Card, 2016).Since 2004, my group has developed rigorous specification standards and implemented them to great effect in numerous user agencies in Ontario and abroad. We now need to investigate how to mitigate aging with effective additives to further reduce cracking.Our short-term objective is to understand how to better assess thermoreversible aging by monitoring the precipitation of waxes, resins and asphaltenes in asphalt at ambient and cold temperatures. In a first for this sector, we will use innovative infrared spectroscopy methods developed to monitor wax and asphaltene precipitation in crude oils to measure wax and asphaltene precipitation in asphalt. We will study gel formation by measuring properties for asphalt that has been chemically aged to varying degrees with sophisticated rheological methods. Factors defining the onset of gelation will provide a more accurate measure of when asphalt becomes prone to cracking than those currently used for specification grading.We will also study irreversible aging to add evidence to longstanding disputes in the literature on how asphalts react with oxygen and harden over time. We will use oxygen-17 nuclear magnetic resonance spectroscopy, again for the first time in this sector, together with more conventional proton, carbon-13 and silicon-29 spectroscopy, in both one and two dimensions. We will use isotope enriched protective groups where feasible. As a long-term goal, we will evaluate the use of wax inhibitors, dispersants, antioxidants and unconventional base asphalts to mitigate aging, and use the spectroscopic, thermal and rheological analysis techniques to assess the effectiveness of our innovative anti-aging additives.This research program will reduce cracking distress in pavements and provide a more sustainable, durable road infrastructure. Federal, provincial and municipal governments, as well as the general public in Canada and abroad, will achieve enormous savings on future infrastructure expenditures, reduce travel delays and improve road safety. The embedded training program will give students a highly desirable set of transferable skills and sought-after knowledge that will give them a competitive edge in the work force.

如今，为市政，省和国家机构建造的沥青路面很少持续到25年前。一些地区的寿命缩小了多达50-60％（年度报告，安大略省的审计长，2016年），这在很大程度上是由于实践和材料不佳。下降是由于交通较重，天气异常（极端/冬季温度），代理人员缺乏知识，导致规格不足的使用以及通过不正确和/或不负责任的某些再生材料的使用而导致道路的“绿色”。在整个加拿大，约有1,200亿美元的道路处于公平，贫困或非常贫穷的州（加拿大基础设施报告卡，2016年）。2004年，我的小组已经制定了严格的规格标准，并在安大略省和国外的许多用户机构中实施了巨大的效果。现在，我们需要研究如何使用有效添加剂来减轻衰老以进一步减少开裂。我们的短期目标是了解如何通过监测环境和寒冷温度下沥青的蜡，树脂和沥青质的沉淀来更好地评估可爱的衰老。在该领域的第一个领域，我们将使用开发的创新红外光谱法来监测原油中的蜡和沥青质沉淀，以测量沥青中的蜡和沥青沉淀。我们将通过测量沥青的特性来研究凝胶形成，该沥青的性质在化学上以不同程度的化学老化。定义凝胶化发作的因素将提供比当前用于规范分级的因素更准确地测量沥青易于开裂。我们还将研究不可逆的衰老，以增加有关沥青如何随着时间的推移与氧气反应和固执的文献中长期存在的证据。我们将首次在该领域再次使用氧气17核磁共振光谱，并在一个和二维中使用更多常规的质子，碳-13和硅-29光谱。我们将使用可行的同位素富含保护的组。作为一个长期目标，我们将评估使用蜡抑制剂，分散剂，抗氧化剂和非常规的基础沥青以减轻衰老，并使用光谱，热和流变学分析技术，以评估我们创新的抗衰老添加剂的有效性。这将减少在裂缝中的裂缝和可持续的困扰，并更加可持续。联邦，省和文化政府以及加拿大和国外的公众将为未来的基础设施支出节省大量，减少旅行延误并提高道路安全。嵌入式培训计划将为学生提供一套高度理想的转移技能和感性。知识将使他们在劳动力中具有竞争优势。