1. Assistant Professor, Dept. of Concrete Structures, Technical Univ. of Lodz, Al. Politechniki 6, 92-549 Lodz, Poland (corresponding author).
2. Ph.D. Student, Dept. of Concrete Structures, Technical Univ. of Lodz, Lodz, Poland.
3. Dipl. Masch.-Ing. ETH, Carbo-Link GmbH, Fehraltorf, Switzerland.
4. Professor, Retired Director, Swiss Federal Laboratories for Materials Testing and Research (EMPA), Dübendorf, Switzerland.