Mimicking Bone Healing Process to Self Repair Concrete Structure Novel Approach Using Porous Network Concrete

摘要

To repair concrete cracks in difficult or dangerous conditions such as underground structures or hazardous liquid containers, self healing mechanism is a promising alternative method. This research aims to imitate the bone self healing process by putting porous concrete internally in the concrete structure to create a porous network similar to ‘spongious bone’. When crack is formed and detected by sensors, healing agent can be infused into the porous network so as to fill up voids and seal a crack or cracks in the concrete body. This idea was tested using cylindrical samples. A porous concrete core was placed in the center of the concrete cylinder. Uniaxial direct tensile load was applied to create cracks close to the notch of the sample. A healing action was performed by injecting healing agent manually. The results show that a macro-crack is sealed and strength of concrete is regained. Therefore, the concept is considered as to be feasible for self repair mechanism in concrete.