| Title |
The Changes of Color and Residual Compressive Strength of Concrete Exposed to High Temperature with Deteriorated Depth |
| Authors |
Lee Joong-Won ; Choi Kwang-Ho ; Hong Kap-Pyo |
| Keywords |
Fire ; High Temperature ; Concrete ; Color Changes |
| Abstract |
The determination of the depth of deteriorated concrete is one of the main problems in the structural assessment of concrete structures that have been subjected to a fire. This information is particularly important in order to optimize the future operations of repair/strengthening, or in decision-making concerning a possible demolition.
The purpose of this study is to propose evaluation technique of damaged depth of concrete exposed at high temperature and to investigate the relation between color change and residual compressive strength. In order to evaluate damaged depth of core picked at member under fire, the 24 specimens have been made with variables of concrete strength(20MPa, 40MPa, 60MPa) and heating exposure condition in 600℃ and 800℃ for 2 hours. Color change analysis at split specimen after heating has been measured and split tensile stress test was performed to find the residual compressive strength against the depth of specimen.
The results show that the residual strength of specimens is coincident with the full development of the pink/red color and the method may be used to define the distance from a heated surface where strength degradation has occurred. |