Investigation of a million tonnes of Ontario hot mix asphalt (2015-2018)

自2011年以来，安大略交通部和各城市（达勒姆、金斯顿、尼亚加拉、皮尔、蒂明斯、滑铁卢、约克）已经实施了实验室标准299 -沥青水泥的抗延性破坏性和实验室标准308 -物理老化沥青水泥的性能等级，以验收超过150万吨的热拌沥青混合料（HMA）。该部的目标是为承包商提供一个机会，以提高他们的能力，指定沥青水泥（AC），以满足性能保证，而市政当局已经实施，试图避免更多的过早开裂。帝国石油公司支持这项研究，因为它在安大略的埃德蒙顿和南蒂科克的炼油厂生产来自阿尔伯塔的冷湖的高质量AC，因此它有既得利益看到改进的规格实施。自2011年以来，AC实施计划的样品可能被混合或污染，HMA与太多的再生路面（RAP）或木瓦（RAS）混合和/或在生产过程中过热。还认识到LS-299和LS-308的当前验收标准可能过于宽松，需要收紧。最后，除了LS-299和LS-308之外，还需要第三种方法，即使用改进的压力老化容器的LS-228加速老化，以有效地处理早期开裂。需要对这些问题进行调查，以便就如何建造物有所值的人行道向利益攸关方提供最佳建议。该提案要求提供配套资金，以开发和验证有助于确保未来道路使用寿命更长的方法。研究成果包括：（1）AC的提取和回收方案;（2）检测AC中废机油的标准;（3）检测AC和HMA中聚合物的标准;（4）多达100个AC和HMA样品的LS-228、LS-299和LS-308测试结果;（5）LS-299、LS-308和LS-228的额外验证;（6）对少量回收AC进行流变质量保证试验。一旦获得这项研究的结果，专有技术将转移给利益相关者，以改善沥青行业。

Since 2011, Laboratory Standard 299 - Asphalt Cement's Resistance to Ductile Failure and Laboratory Standard 308 - Performance Grade of Physically Aged Asphalt Cement have been implemented for acceptance of over 1.5 million tonnes of hot mix asphalt (HMA) for the Ontario Ministry of Transportation and various municipalities (Durham, Kingston, Niagara, Peel, Timmins, Waterloo, York). The Ministry's objective has been to provide contractors with an opportunity to improve their ability to specify asphalt cement (AC) that meets performance warranties while municipalities have implemented in an attempt to stave off more premature cracking. Imperial Oil supports the research because it produces top-quality AC from Cold Lake, Alberta, at its refineries in Edmonton and Nanticoke, Ontario, and it therefore has a vested interest to see improved specifications implemented. It is possible, or even likely, that samples from the AC implementation initiatives since 2011 were mixed up or contaminated and that HMA was mixed with too much recycled pavement (RAP) or shingles (RAS) and/or overheated during production. It is also recognized that current acceptance criteria for LS-299 and LS-308 are likely too permissive and need tightening. Finally, a third method, LS-228 Accelerated Aging Using Modified Pressure Aging Vessel, is needed in addition to LS-299 and LS-308, to effectively deal with the early cracking. These issues need to be investigated in order to provide the best advice to stakeholders on how to construct pavements that provide value for money. This proposal requests matching funds to develop and validate methods that help ensure that future roads last longer. The research deliverables include: (1) an extraction and recovery protocol for AC; (2) a standard for detecting waste engine oils in AC; (3) a standard for detecting polymers in AC and HMA; (4) LS-228, LS-299 and LS-308 test results for up to 100 AC and HMA samples; (5) additional validation of LS-299, LS-308 and LS-228; and (6) a rheological quality assurance test for small quantities of recovered AC. Once the results of this research are obtained, the knowhow will be transferred to stakeholders for the betterment of the asphalt industry.