In this study, CGS is a concrete admixture material that has been investigated as a way to promoto recycling of CSG. As results, Show that the early strength is low and the activity index is according to the degree of fineness is insignificant

In this research is underway to determine the exact damage level of concrete structures damaged by fire. Cement paste hardened at 700℃ was characterized by TGA. As the depth increased, the mass reduction rate increased and the mass reduction rate decreased as the retention time increased.

In this study, the chemical deformation of cement pastes was determined by chemical analysis. X-ray diffraction equipment was used to investigate the chemical transformation. The decrease of ettringite and the collapse of gypsum were confirmed and then the calcium hydroxide gradually decreased.

In the study, direct tensile test was conducted to perform statistical approaches to the maximum tensile strength of design strengths (120, 150 and 180 MPa), and then the direct tensile database construction was made to examine the reliability of the direct tensile test.

In this study, In this study, Simulation using COMSOL Multiphysics thermal flow program of A company was carried out for thermal diffusion analysis according to depth of concrete exposed to high temperature. As a result of the analysis, it was found that the thermal diffusivity decreased with the depth and the temperature difference decreased with the heating time.

In this study, In this study, Simulation using COMSOL Multiphysics thermal flow program of A company was carried out for thermal diffusion analysis according to depth of concrete exposed to high temperature. As a result of the analysis, it was found that the thermal diffusivity decreased with the depth and the temperature difference decreased with the heating time.