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

自2011年以来，安大略省交通部和各市政府(达勒姆、金斯敦、尼亚加拉、皮尔、蒂明斯、滑铁卢、约克)已实施了实验室标准299-沥青水泥的延性破坏性能等级和实验室标准308-物理老化沥青水泥的性能等级，以验收超过150万吨热拌沥青(HMA)。该部的目标一直是为承包商提供一个机会，以提高他们指定符合性能保证的沥青水泥(AC)的能力，同时市政当局已经实施了这些措施，试图防止更多的过早裂缝。帝国石油支持这项研究，因为它在艾伯塔省冷湖的炼油厂生产高质量的空调，位于安大略省埃德蒙顿和南蒂科克的炼油厂，因此看到改进的规格实施符合它的既得利益。自2011年以来实施空调倡议的样品有可能被混合或污染，HMA在生产过程中混合了过多的再生路面(RAP)或瓦片(RA)和/或过热。还认识到，目前对LS-299和LS-308的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进行LS-228加速老化，以有效地解决早期开裂问题。需要调查这些问题，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。这项提案要求配套资金，以开发和验证有助于确保未来道路使用更长时间的方法。研究成果包括：(1)空调的提取和回收方案；(2)空调中废机油的检测标准；(3)空调和HMA中聚合物的检测标准；(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的进一步验证；以及(6)针对少量回收AC的流变性质量保证测试。一旦这项研究的结果出来，技术诀窍将被转让给利益相关者，以促进沥青行业的发展。

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.