مهندس سید محمد طبیب، مهندس ارشد بخش قیر و مواد قیری در MTO
چهارشنبه 5 شهریور 1399، ساعت 13:30 تا 15:00
نحوه ورود: مجانی و بدون نیاز به پسورد – بر روی گزینه “میهمان” کلیک کنید و نام خود را وارد کنید.
Seyed Mohammad Tabib, M.Sc., P.Eng. is a senior bituminous engineer with the Bituminous Section of the MTO. He completed a M.Sc. degree in 1996 from Sharif University of Technology in Transportation Engineering , majored in asphalt technology, and another M.Sc. in 2001 in Traffic Engineering from U of T. Seyed has a broad range of background experience in materials engineering and research, pavement, geotechnical, and traffic engineering in Ontario and overseas. He joined MTO in 2003 and has provided effective support to regional and head office programs ever since.
Seyed is a licensed engineer with the Professional Engineers Ontario (PEO). He has authored and co-authored several research papers in asphalt technology, pavement, and traffic engineering.
The Ministry of Transportation of Ontario (MTO) uses a PG plus specification to mitigate premature pavement cracking. Due to complex nature of the various asphalt mixture components and binder additives, testing the tank asphalt cement (AC) alone may not be sufficient and there is a need for testing post-production products for acceptance.
The MTO is evaluating various asphalt mix performance tests with the goal to establish acceptance criteria for post-production asphalt mix that relates to long term pavement performance (i.e., to achieve a balance between resistance to cracking and rutting). Loose asphalt mix and pavement cores were collected and tested from various paving contracts using the following tests:
• Flexibility Index Test (FIT)
• Disk-Shaped Compact Tension (DC(T)) test
• Hamburg Wheel Tracking (HWT) test
Work to date has revealed that, in general, these tests were able to differentiate asphalt mixes based on PGAC, asphalt mix type, and presence of RAP.
MTO has also evaluated cores taken from good and poor performing pavements 5-13 years old using FIT and DC(T) tests and obtained reasonable results. Both recovered AC grading and mix performance tests are considered effective tools in evaluating pavement performance.
This presentation will provide an overview of the test procedure, results, and preliminary threshold values for acceptance of post-production asphalt mixes.