Method for plugging cast-in-situ concrete slab or base-plate crack with microbe-sedimented calcium carbonate

Abstract

The invention discloses a method for plugging a cast-in-situ concrete slab or base-plate crack with microbe-sedimented calcium carbonate. The method includes preparation of plugging materials, plugging of the cast-in-situ concrete slab crack and plugging of the cast-in-situ base-plate crack. A method for preparation of the plugging materials includes preparation of calcium source solutions, preparation of nutrient salt solutions and preparation of microbial solutions; a method for plugging of the cast-in-situ concrete slab crack includes that the pressure grouting mode is adopted on base of the crack, the top surface and bottom surface of the plugged crack are sealed with rubber tapes, and water solutions are ensured to flow out with bacteria filtered within the crack; a rubber hose is inserted in the bottom of the other end of the crack, and an injector is connected with the rubber tube; the injector is utilized to inject the microbial solutions, the nutrient salt solutions and the calcium source solutions with the volume ratio of 1:1:1, and fluid is ensured to seep from the position of a gauze; grouting work is repeated once every 24 hours for 5 days; the gauge, the rubber tube, the injector and the sealing rubber tapes are removed. By the method, problems of durability of rusting and the like caused by exposure of steel bars inside plates can be effectively solved.

Description

technical field [0001] The invention relates to a crack prevention technology for cast-in-place concrete slabs, in particular to a method for blocking cracks in floor or bottom slabs of cast-in-place concrete slabs by microbial deposition of calcium carbonate. Background technique [0002] At present, with the improvement of people's living standards, the requirements for housing functions are getting higher and higher. While satisfying comfort, the large bay structure also causes cracks in the quality of the concrete floor, which not only affects the appearance, but also brings insecurity to the residents. At the same time, it also forms leakage channels, which seriously affects the use function and Caused many quality disputes. [0003] At this stage, many places in residential projects prohibit the use of prestressed perforated panels, and cast-in-place panels improve structural integrity and durability. Some people think that the elimination of prefabricated slabs and ...

AI Technical Summary

Problems solved by technology

However, this method does not involve the specific method and steps of injecting the bacterial solution and the repairing nutrient solution into the cracks.

[0011] Jia Qiang's patents "Methods for Microbial Grouting to Seal Transverse Cracks in Basement Concrete Structure" (ZL201110412162.2) and "Methods for Microbial Grouting to Seal Vertical Cracks in Basement Concrete Structures" (ZL201110413188.9) are precisely based on this principle for the improvement of basement concrete structures. The cracks have been sealed, but this method is for the sealing of the wall cracks in the concrete basement, and no effective treatment method has been proposed for the upper and lower through cracks on horizontal members such as cast-in-place floors and basement floors, and the chlorine used Calcium solution as a calcium source can easily cause corrosion of steel bars in concrete

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