Concrete is one of the most common building materials around the world. Therefore, it is important to improve its properties. One of the most important problems in the design and implementation of concrete buildings is the weight of the dead load of building components. The use of lightweight concrete in concrete structures reduces dead load. However, due to the presence of porosity in granular concrete, it is important to find a biologically and environmentally friendly way in order to reduce permeability, increase the durability and repairing its cracks. To this end, chemical methods such as epoxy and resin injection have been used but Not only they pollute the environment, but the cost of using them is high and it is not possible to reach all the cracks with this method. In the present study, a bacteria has been used in concrete samples, which, in the presence of calcium ion, has the ability to produce calcium carbonate sediment. The samples are placed in a medium containing calcium lactate (as a source of calcium) and urea, and conduct electrical resistance, compressive strength and water absorption tests on them. For this purpose, we used cylindrical samples of 100 mm diameter and a height of 200 mm. Finally, the results indicate increases in electrical resistance and compressive strength and a decrease in the percentage of water absorption of concrete, which can be attributed to the filling of concrete pores by calcium carbonate sedimentation.