(Lecture, Oct 15)Study on Low Temperature Size Effect of Asphalt Mixture
time: 2018-10-14

Title: Study on Low Temperature Size Effect of Asphalt Mixture

Time: Oct 15, 14:30-16:30


Venue: Conference Room 410, Building of Transportation, Wushan Campus

Speaker: Dr. Cannone Falchetto Augusto from Technische Universität Braunschweig

Welcome all the teachers and students to attend this lecture!


Speaker Introduction:

Cannone Falchetto Augusto, associate professor. He graduated from the University of Parma in Italy with a Ph.D. in 2011 and graduated from the University of Minnesota in 2013 with a Ph.D. From August 2008 to January 2013, he was a postgraduate assistant and graduate assistant at the University of Minnesota (Civil Engineering and Road Materials). From July 2013 to June 2017, he worked as a research assistant at the Technical University of Braunschweig, Germany; in April 2017 – currently, he is an associate professor at the Technical University of Braunschweig, teaching civil engineering and pavement concrete.


Cannone Falchetto Augusto received the Matthew J. Huber Award from the University of Minnesota in 2012, the Best Paper Award from Road Materials and Pavement Design in 2013, and the European Asphalt Pavement Association (EATA) in 2015 with solid research knowledge and rich research results. Best Paper Award and 2017 Outstanding Paper Award from the International Society of Asphalt Pavements (ISAP). At the same time he became a member of the Association of Asphalt Paving Technology Association (AAPT), a member of the RILEM Asphalt Concrete Chemical-Mechanical Characterization Technical Committee and a member of the International Asphalt Pavement Society in 2014; and in 2016 he became a member of the ASCE Engineering Mechanics Committee; in 2017 he became the team leader of the RILEM Asphalt Pavement Recycling Technical Committee and the TRB AFK20 Asphalt Adhesive Properties Committee. He have been closely following the research hotspots and new directions in this field.


His main research directions include pavement management and maintenance technology, dynamic mechanical response of asphalt mixture, asphalt mixture grading theory, internal structure analysis of asphalt mixture, finite element simulation of viscoelastic mechanics, etc. In recent years, the main research projects are Preliminary Investigation on Size Effect in Asphalt Mixture – ISBS.


Lecture Introduction:

Low temperature cracking is a serious distress for asphalt pavement built in cold regions. Therefore, accurate assessment of strength and fracture properties of asphalt mixtures is fundamental for ensuring the long term integrity of the entire pavement structure. It has been shown that asphalt mixtures behave in a quasibrittle manner at low temperatures and, consequently, its nominal strength strongly depends on the structure size. Most of the research performed in the past has experimentally addressed this phenomenon either on unnotched or deep-notched specimens corresponding to Type I and Type II size effect, respectively. However, the evolution of the pavement conditions during the service life can lead to the formation and propagation of cracks which strongly affect the response of the material and, eventually, determine a complex size effect. In this research a comprehensive experimental study is presented to evaluate the effect of notch depth and shape on the scaling law for quasibrittle fracture. Three-point bending tests are performed on plain and notched asphalt mixture beams of different sizes at low temperature. The results on unnotched specimens are analyzed through the Type I energetic-statistical size effect law (SEL) in combination with the Weakest Link Model, while, in the case of deep notched specimens, the Type II SEL is used. A significant variation in the evolution of the SEL is observed with a dramatic decrease in strength over size and notch depth.