Concrete crack repairing material with sodium alginate immobilized microorganisms and preparation method of concrete crack repairing material

The invention discloses a sodium alginate immobilized microorganism concrete crack repair material and a preparation method thereof, and the sodium alginate immobilized microorganism concrete crack repair material comprises the following components by mass: 0.5-2 parts of sodium alginate, 6-12 parts of urea, 17-34 parts of calcium acetate, 10 parts of bacterial strain liquid, and 190 parts of distilled water; the bacterial strain liquid is bacillus pasteurii strain liquid, the concentration of the microbial strain liquid is 107-109 cells/mL, and the ratio of beta-D-mannuronic acid to alpha-L-guluronic acid in the sodium alginate is 1: 1. The product of microorganism mineralization deposition is calcium carbonate, the calcium carbonate has good compatibility with a concrete matrix, and the calcium carbonate is an inorganic material, has no negative influence on the environment and is higher in durability. Sodium alginate and calcium acetate react to generate calcium alginate hydrogel, a good growth environment