Abstract
Immobilization of chloride ion is important for applying to the building into the salt damage environment like seaside. It is known that the aluminate phase（C3A）produce AFm phase such as Friedel’s salt or Kuzel’s salt which immobilize chloride ion into its layer structure. In hydration, the ferrite phase（C4AF）generate less heat compared with C3A, so it is strong point to prevent thermal crack. Since C4AF also produce AFm phase, it is expected that C4AF hydrates can immobilize chloride ion. The authors have been reported the immobilization of many harmful anion such as iodide ion and chromate ion in hydrated products of C4AF. This paper describes the hydration products in C4AF-CaSO4・2H2O-CaCl2 system and the immobilization of chloride ion in hydrated products of C4AF.
In this system containing CaCl2, Kuzel’s salt or Friedel’s salt was produced. Therefore, it is clear that the immobilization of chloride ion is occurred. Fe-containing gel was also found in every hydrated samples. The main elements of Fe-containing gel are Ca and Fe. Although Cl is detected from Fe-containing gel, it seems that Fe-containing gel immobilize less chloride ion than AFm phase since the density of chloride ion is smaller than that of Friedel’s salt.
