Kefei Li, Professor, Civil Engineering Department, Tsinghua University, Beijing, China. Li obtained his first Ph.D in Bridge Engineering in 2000 from Tongji University (China), and the second in Material Science from Ecole des Ponts, ParisTech (France) in 2002. He began his professional life as a civil engineering consultant in OXAND S.A. (France) and transferred to Tsinghua University taking a teaching-research position in 2004. His research interests include durability mechanisms of structural concretes, durability design of concrete structures, and assessment of structural behaviors. He also participated in or led the following projects:- the design of Hong Kong-Zhuhai-Macao sea link project (design life of 120 years); the durability design and assessment of High Integrity Container for radioactive disposal (design life of 300 years, 2010-now); the Chinese design code GB/T 50476-2008 "Code for Durability Design of Concrete Structures". He has published more than 50 journal papers and this is his first book.