Experimental Study on the Performance of Self-Healing Concrete Based on Temperature Response

In construction engineering, new building materials exhibit unique properties, with self-healing concrete drawing significant attention for addressing issues such as water leakage through fine cracks in concrete. This thesis investigates the healing performance of self-healing concrete based on ceramsite carrying Bacillus subtilis under various temperature conditions, conducting repair tests on self-healing concrete within a temperature range of 10°C to 40°C. It was found that the volume fraction of ceramsite carrying bacteria significantly impacts the mechanical properties of self-healing concrete. For the mix proportion in this study, the optimal replacement volume fraction of ceramsite in self-healing concrete was determined to be 45%. Additionally, environmental temperature noticeably affects the healing performance of self-healing concrete, with the crack healing rate showing a trend of initially decreasing and then increasing with rising temperature. The best healing effect was observed at an environmental temperature of 40°C, achieving a healing rate of 81.8%.