Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

A continuous solidification process of blast furnace slag was developed to promote the use air-cooled coarse aggregate for concrete. In this process, molten can solidify in only 120 s and thickness is about 25 mm. This suppresses gas generation greatly reduces water absorption. Most crystalline, part has a glass layer on its surface. Slag with brittle because it contains several cracks. Therefore, microscopic observation thermal stress analysis solidified were carried out clarify mechanism crack plate-like slag. observation, cracks length 8 mm found layer. From analysis, cooling pattern piled temperature difference 200 K exists between center mold side pit, keeping results tensile more than 50 MPa. However, crystalline slag, gradient pit very small retained as result, almost 0