Anotace:
In this study, we selected cement mortar as the research object, used the expanded perlite (EP) which adsorbed bacteria as the self-healing agent, and mixed basalt fibers to improve the properties. The effects of different dosages and sizes of self-healing agent and basalt fibers on the mechanical properties and self-healing properties of cement mortar were investigated by compressive strength, SEM, EDS, XRD, and optical microscopy tests. The results of the study showed that the bacteria were able to survive in cement mortar using expanded perlite as a carrier and induced the generation of calcium carbonate precipitates to fill the cracks. The dosage of the healing agent is proportional to the amount of healing products generated, which can significantly improve the self-healing performance of cracks in mortar. Fibers can bond the material, play the role of bridging, and become the adsorption carrier of bacterial metabolic precipitates, which is beneficial to the dense bonding of the products. The addition of appropriate amount of basalt fiber can simultaneously improve the self-healing properties and compressive strength of mortar. The simultaneous addition of healing agent and basalt fiber can realize the complementary advantages. By adding a small amount of healing agent and a moderate amount of fiber, not only can achieve 100% self-healing performance, but also improve the compressive strength of mortar. This study provides useful theoretical guidance for the design, preparation, and application of concrete.