Effects of compaction on the initiation and propogation of top-down cracks and the shear properties of asphalt mixes

压实对自上而下裂缝的萌生和扩展以及沥青混合料剪切性能的影响

• 批准号: 5852-2006
• 负责人: AbdElHalim, Omar
• 金额: $ 1.38万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365655
• 关键词: Effects; compaction; initiation; propogation; top

The research work of the applicant over the past 20 years has established that one major cause of the early deterioration of asphalt pavements is construction-induced cracks.  This conclusion was proved when a fundamentally new compaction device, Asphalt Multi-Integrated Roller (AMIR), was developed.  The AMIR compactor prevents such cracking during construction.  A second primary cause of early deterioration is shoving of the asphalt mix as a result of insufficient shear stiffness under traffic loading.  In another ground-breaking effort, the applicant developed a new equipment, In-Situ Shear Stiffness Test (InSiSST).  This facility measures the shear properties of asphalt pavements "on-the-road" without the need for the time consuming, costly, and unrepresentative laboratory analysis.   The proposed research builds upon these two important achievements.  The research plan consists of four main tasks: (1) experimental investigation including field and laboratory testing from test sections in Canada and overseas, (2) theoretical investigation, (3) development of prediction models based on the results of the preceding investigations, and (4) evaluation of short and long-term performance.  The research plan includes the construction of field tests using the AMIR and steel rollers (side by side), and field and laboratory tests to compare their long- term performance.  In addition, a theoretical investigation will be carried out to develop statistical models for predicting pavement behaviour and performance based on reliable field and laboratory data.  The modeling of pavement performance will continue to evolve over the five-year duration of the project.  The most significant impact of the proposed work is the development of a Canadian technology dealing with a universal market that is an important component of the nation's infrastructure.  The proposed research is expected to improve pavement performance, compaction, and evaluation technologies.

申请人过去20年的研究工作已经确定，沥青路面早期恶化的一个主要原因是施工引起的裂缝。这一结论在开发出一种全新的压实设备--沥青多功能一体化压路机(AMIR)--时得到了证实。AMIR压实机防止了施工过程中的这种裂缝。*早期恶化的第二个主要原因是由于交通荷载下剪切刚度不足而导致沥青混合料被推挤。在另一项开创性的努力中，申请人开发了一种新的设备，原位剪切刚度测试(InSiSST)。该设备测量沥青路面的剪切性能，而不需要耗时、昂贵和不具代表性的实验室分析。建议的研究建立在这两项重要成果的基础上。研究计划包括四项主要任务：(1)实验调查，包括加拿大和海外测试路段的现场和实验室测试，(2)理论调查，(3)基于先前调查结果开发预测模型，以及(4)短期和长期性能评估。研究计划包括使用AMIR和钢辊(并排)进行现场测试，以及现场和实验室测试，以比较它们的长期性能。此外，将开展一项理论研究，以开发基于可靠的现场和实验室数据预测路面行为和性能的统计模型。路面性能的建模将在项目的五年持续时间内继续发展。拟议工作最重要的影响是开发了一项处理作为国家基础设施重要组成部分的普遍市场的加拿大技术。拟议的研究预计将改善路面性能、压实和评估技术。