1. Assistant Researcher, Wuhan Univ. of Technology, State Key Laboratory of Silicate Materials for Architectures, Luoshi Rd. 122, Wuhan 430070, China (corresponding author).
2. Professor, Delft Univ. of Technology, Faculty of Civil Engineering and Geosciences, Micromechanics Laboratory (MICROLAB), Stevinweg 1, 2628 CN Delft, The Netherlands.
3. Associate Professor, Delft Univ. of Technology, Faculty of Civil Engineering and Geosciences, Road and Railway Engineering, Stevinweg 1, 2628 CN Delft, The Netherlands.