Yuan Jian’an: Professor of Chemistry and Materials Science at the Faculty of Science. He is mainly engaged in teaching of chemistry and road materials, preparation and compounding and synthesis of road materials, research on performance of road materials and technical consultation. He has many innovative technologies in asphalt, modified asphalt technology and evaluation, application of modified materials, and development of new road materials, leading the way at home and abroad. He has published over 40 papers in important journals at home and abroad. E-mail：yja1956@sina.com