微生物修复混凝土细小裂缝不同修复 方法对比研究

The effect of seepage caused by small cracks in concrete structure cannot be ignored in engineering application, so it is of great significance to study the repair of small cracks and the evaluation of effect after repair. Two methods of microbial remediation were used to repair cracks of concrete specimen the injections and soaking method, and through the permeability, the unconfined compressive strength, damping ratio to evaluate repair effect of two methods. Results show that the permeability of the concrete specimens repaired by two kinds of microbiological repair methods decrease, and the permeability reduction with the injection method is more obvious. The strength of the specimen is not only improved more by injection, but also affected less by the fatigue test. In addition, the strength of the test is relatively stable, and the strength of the specimen is more than 90% of the strength of the non-crack specimens. After the fracture repair, the hysteresis loop of concrete samples is relatively plump and the damping ratio is larger and samples recovered by the injection method have the plumpest one and the largest damping ratio. Compared with not repair specimen, the damping ratio of specimens with injections repair is improved by more than 0. 44%, therefore the technique of small fracture repair with the injection method can be widely used in the concrete building structure which has long been subjected to dynamic and static load.