Penetration of the Chloride Ion to the High-Strength Concrete Mixed with Ground Granulated Blast Furnace Slag -Measurement of a Distribution of the Chloride Ion Concentration by EPMA-
Hiromichi MATSUSHITA, Yoshitaka MAEDA, Kazumasa FUJITA and Kenji IWAI
Abstract:As a part of the research on application of blast-furnace slag to prestressed concrete, chloride ion penetration of the high strength concrete used blast-furnace slag was examined paying attention to wet curing period. Besides, in order to measure detailed distribution of the chloride ion concentration, we propose an approach with EPMA technique and it compared with the former method. As the result, concrete mixed with ground granulated blast-furnace slag increased the concentration of chloride ion near the surface of concrete, but decreased its penetration to inside. Furthermore, by EPMA technique, it is possible to compute detailed distribution of chloride ion concentration and it has checked that use of EPMA was significant in the evaluation of chloride ion concentration on the surface of concrete, while there are some errors about an absolute value. Key Words:Ground granulated blast furnace slag, High-strength concrete, Chloride ion, Diffusion coefficient, EPMA