| Title |
Mechanical Properties of Granite Concrete After Exposed to High Temperatures |
| Authors |
Lee Jae-Sung ; Kim Jae-Keon |
| Keywords |
Granite Concrete ; Mechanical Properties ; Fire ; Heating ; Cooling |
| Abstract |
Understanding of concrete properties under high temperature is essential to enhance fire resistance of reinforced concrete structures (RCS). It is also essential and important to provide accurate information for fire design of RCS. During a fire disaster, different parts of a concrete structure may experience different heating and cooling processes. The purpose of this study is to investigate the mechanical properties of the granite concrete subjected to various cooling scenarios after heating with the aid of residual compressive strength test and ultrasonic pulse velocity test. The thermal diffusivity of the concrete cylinder is also reported. The test variables are three cooling conditions (slow cooling, natural cooling, and water cooling) and four maximum target temperatures 200, 400, 600, and 800°C. The heating rate is 2°C/min, and the holding time at the maximum temperature is 4hrs. The test data for residual mechanical properties show that strength and stiffness properties decrease significantly as cooling rate and maximum temperature increase. |