关于举办美国威斯康星大学麦迪逊分校大学Hussain U. Bahia教授学术讲座的通知
发布时间: 2021-09-22

题目:复杂沥青粘合剂性能分级的演变

Evolution of Performance Grading of Complex Asphalt Binders

时间:20210924日周五10001100

地点:腾讯会议 ID42265298356

腾讯直播间:https://meeting.tencent.com/l/QALGLWoVMAcS

报告人:

Hussain U. Bahia威斯康星大学麦迪逊分校,土木与环境工程系

Bahia教授官方主页:https://directory.engr.wisc.edu/cee/faculty/bahia_hussain.

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                                   土木与交通学院

                                                                                                            20210922

报告人简介:

Hussain U. Bahia目前是美国威斯康星大学麦迪逊分校土木与环境工程系的教授,从事路面材料和设计相关研究。Bahia教授于1991年在宾夕法尼亚州立大学完成博士学位,并作为沥青粘合剂的主要研究员参与了SHRP研究。曾在1995年任职美国沥青协会研究及技术服务部的主任,并于1996年加入威斯康星大学至今。2005年至2012年期间,曾担任威斯康星州公路研究项目的技术总监,并于2009年成立了改性沥青研究中心(MARC),担任该中心的主任。Bahia教授目前发表了期刊论文200余篇,指导超过75名硕士和博士生,并培养了10多名博士后研究员。Bahia教授是中东沥青技术专家协会(MESAT)的创始人之一,并在2013-2016年期间担任卡塔尔公共工程署的首席路面专家。他为美国、南美、非洲和中东的许多公司和公路机构提供咨询服务。更多详情请参阅

https://directory.engr.wisc.edu/cee/faculty/bahia_hussain.

 

Professor Bahia completed his PhD at the Pennsylvania State University in 1991 and participated in the SHRP research as a leading researcher on asphalt binders. He is currently a full professor in the department of Civil and Environmental Engineering at which he teaches and conducts research on pavement materials and design. He served as the Director of Research and Technical Services of the Asphalt Institute-USA in 1995 and joined the University of Wisconsin on permanent basis in 1996. He served as the Technical Director of the Wisconsin Highway Research Program from 2005 until 2012 and established the Modified Asphalt Research Center (MARC) in 2009 for which he serves as the Director. He has published more than 200 technical papers in refereed journals and has graduated more than 75 MS and Ph.D. students, and supervised 10 post-doctoral fellows at UW-Madison.He is one of the Founders of the Middle East Society of Asphalt Technologists (MESAT) and served as the Leading Pavement Expert for the Public Work Authority in Qatar 2013-2016.  He provides consulting services for many companies and road agencies in the USA, South America, Africa, and the Middle East.

 

报告摘要:

道路对于任何社会而言是最重要的基础设施要素之一。世界上90%以上的铺装道路都由矿物骨料制成的沥青混合料以及约5%重量比的沥青粘合剂(沥青)混合料组成。修建道路的费用也非常昂贵,一旦失效,就会对人们的正常生活和经济发展造成巨大的破坏。尽管矿物集料在沥青混合料的性能上发挥着重要作用,但沥青其实很容易通过改性在许多情况下能够更有效地控制抗裂性。

在过去的10年里,更复杂的沥青改性研究一直在进行。许多添加剂研发用以改变沥青的分子性质及其对机械负荷、热负荷和水分的反应。基于此,Bahia教授团队开发了一系列新的表征方法来描述这些复杂粘合剂的行为,且这些方法还在不断地得到优化和完善。本讲座将重点介绍为提高粘合剂性能分级的想法,并说明改进当前Superpave分级系统的必要性。讲座将展示粘合剂的粘度应在多个剪切速率下进行评估;复杂粘合剂的润滑性至关重要,车辙和开裂的大应变测试的必要性等几个关键问题。此类在改善复杂粘合剂特性方面的投入研究对于未来铺设更加可持续发展的公路的投资建设意义重大。

Roads are one of the most important infrastructure elements for any society. More than90% of paved roads in the world includes the use of asphalt mixtures which are produced from mineral aggregates and about 5% by weight of mixture of asphalt binders (bitumen). Roads are also very expensive to built and when the fail, they cause tremendous disruption of normal people life and of economic progress. Although the mineral aggregates play an important role in asphalt mixture performance, the bitumen is by far easier to modify and in many cases much more effective in controlling cracking resistance.

In the last 10 years more complex modification of bitumen is taking place. Many types of additives are being proposed that are altering the molecular nature of bitumen and its response to mechanical loading, thermal loading and moisture. Therefore, a new set of characterization methods that can capture the behavior of these complex binders have been developed, and continue to evolve.This presentation will focus on the ideas under consideration for better Performance Grading of binders and show the need for improvement of the current Superpave grading systems. The presentation will show that viscosity of binders should be evaluated at multiple shear rates; that lubricity of complex binders is critical and that large strain testing for rutting and cracking is necessary.

Such investments in improving complex binder characterization is needed to protect the future investments in paving highways more sustainable.