{"id":1372,"date":"2020-12-02T11:57:00","date_gmt":"2020-12-02T08:27:00","guid":{"rendered":"http:\/\/dri.civil.sharif.ir\/?p=1372"},"modified":"2021-10-26T12:00:45","modified_gmt":"2021-10-26T08:30:45","slug":"%d8%a2%da%af%d9%87%db%8c-%d8%a8%d8%b1%da%af%d8%b2%d8%a7%d8%b1%db%8c-%d9%88%d8%a8%db%8c%d9%86%d8%a7%d8%b1-%d8%b9%d9%84%d9%85%db%8c-%d8%af%d8%b1-%d8%b2%d9%85%db%8c%d9%86%d9%87-%d8%b1%d9%88%d8%b3%d8%a7-5","status":"publish","type":"post","link":"http:\/\/dri.civil.sharif.ir\/?p=1372","title":{"rendered":"\u0622\u06af\u0647\u06cc \u0628\u0631\u06af\u0632\u0627\u0631\u06cc \u0648\u0628\u06cc\u0646\u0627\u0631 \u0639\u0644\u0645\u06cc \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u0631\u0648\u0633\u0627\u0632\u06cc \u0648 \u0645\u0648\u0627\u062f \u0622\u0633\u0641\u0627\u0644\u062a\u06cc"},"content":{"rendered":"\n

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Evaluation of effectiveness of different parameters on thermal cracking properties of asphalt mixtures and its numerical modeling<\/strong><\/strong><\/p>\n\n\n\n

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\u0644\u06cc\u0646\u06a9 \u0648\u0631\u0648\u062f: <\/strong><\/strong><\/p>\n\n\n\n

https:\/\/vc.sharif.edu\/ch\/civil-seminar<\/a><\/p>\n\n\n\n

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Abstract<\/strong><\/p>\n\n\n\n

One of the main types of distress in asphalt pavements is low temperature (thermal) cracking. This kind of distress may happen in two different forms, instant cracking due to very low temperatures or cracking due to thermal fatigue. In this webinar, the effectiveness of different parameters of the asphalt mixture on its thermal cracking behavior will be discussed based on the results of experimental tests such as dynamic modulus in low and intermediate temperature, indirect tensile and semi-circular bending tests in low temperature, cyclic fatigue in intermediate temperatures, Thermal Stress Restrained Specimen (TSRST) and Uniaxial Thermal Stress and Strain test (UTSST). The parameters under study include asphalt bitumen percentage, air void percentage, filer content, aggregate type, type of modification of asphalt binder and aging levels on the performance of asphalt mixes, especially in low temperatures. Numerical modeling of asphalt mixtures using ABAQUS software will also be discussed. Specifically, the improvements in the numerical results by implementing three new features in the numerical model are assessed. These features include: 1) incorporating of cohesive zone model to predict the extent of crack propagation with the use of fracture energy parameter, 2) accounting the effect of continuum damage in predicting the induced stress, 3) including the change in contraction coefficients of the asphalt mixes with respect to temperature. In this webinar, the analysis method of dynamic modulus and cyclic fatigue experimental data as well as calculations needed to obtain the VECD properties of asphalt mixtures will be discussed.<\/p>\n\n\n\n

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Biography<\/strong><\/p>\n\n\n\n

Hamidreza Sahebzamani holds a PhD in Road and Transportation Engineering from University of Tehran. He started his undergraduate studies in Civil Engineering at College of Engineering, University of Tehran in 2006. Recognized as an exceptional talent member during his graduate studies, he was given the honor to continue his studies for obtaining a PhD degree without entrance exam. He conducted part of his thesis experimental tests at Eiffage lab located in Lyon, France during his PhD sabbatical. He has published more than 25 papers in national and international conferences and journals. Dr. Sahebzamani joined Kandovan Pars Company in 2012 and currently is the head of the market development department and quality control division. He is in charge of R&D department as well. His research interests include viscoelastic modeling of asphalt mixtures and innovative methods of surface treatment, i.e. very thin-layer and ultra-thin layer polymer-modified asphalt. Carrying out the first very thin-layer asphalt project in Iran with the cooperation of Eiffage company, is one of his achievements in this department.<\/p>\n\n\n\n

He is a member of different committees and has contributed to the revision of the Road General Technical Specification (No.101), preparation of the Guideline for Assessment of Quality & Technical Specifications of Performed Operations (No. 773), preparation of the National standards for bitumen and asphalt, revision of the price analysis handbook and preparation of the Iran Road code (No.800). He is also an active member of the technical committee of Road Construction companies\u2019 association and has been on the scientific committee board of the National Bitumen and Asphalt congress for the past three years.<\/p>\n","protected":false},"excerpt":{"rendered":"

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