1. Dep. of Mineralogy, Leibniz University Hannover, Callinstr. 3; Hannover Germany
2. Material Testing Institute for Civil Engineering, Beethovenstr. 52; Braunschweig Germany
3. Institute for building materials, Technical University Braunschweig, Beethovenstr. 52; Braunschweig Germany
4. Dep. of Civil and Environmental Engineering, Muang, Chiang Mai; RMTUL, 128 Huay-Kaew Rd.; Chiang Mai Thailand