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

A technology of calcium carbonate and microorganisms, which is applied in building construction and construction, can solve problems such as corrosion of concrete and steel bars, and achieve the effect of consistent thermal expansion coefficient and good permeability

Active Publication Date: 2014-12-10
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 principl

Method used

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

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Effect test

Embodiment 1

[0045] The method for plugging cracks in cast-in-place concrete slabs by microbial deposition of calcium carbonate comprises:

[0046] A. Preparation of plugging materials

[0047] (1) The preparation of calcium source solution provides calcium ion for calcium carbonate deposition; The present invention selects calcium nitrate (Ca(NO 3 ) 2 ) solution or calcium acetate (Ca(CH 3 COO) 2 ) solution, the concentration is 1mol / L;

[0048] (2) the preparation of nutrient salt solution provides nutrients for the growth and reproduction of microorganisms, and the present invention selects urea (CO(NH 2 ) 2 ) solution, the concentration is 1mol / L;

[0049] (3) preparation of microorganisms, the present invention adopts Bacillus pasteurianum, adopts fermentation tank to cultivate. Fill the fermenter with pure water, and add the following substances per liter of water to prepare a culture medium solution: 20g / L of yeast extract, 10g / L of ammonium sulfate, 2g / L of sodium hydroxide ...

Embodiment 2

[0057] A method for microbial deposition of calcium carbonate to plug cracks in the base plate of cast-in-place concrete slabs, comprising:

[0058] A. Preparation of plugging materials

[0059] (1) The preparation of calcium source solution provides calcium ion for calcium carbonate deposition; The present invention selects calcium nitrate (Ca(NO 3 ) 2 ) solution or calcium acetate (Ca(CH 3 COO) 2 ) solution, the concentration is 1mol / L;

[0060] (2) the preparation of nutrient salt solution provides nutrients for the growth and reproduction of microorganisms, and the present invention selects urea (CO(NH 2 ) 2 ) solution, the concentration is 1mol / L;

[0061] (3) preparation of microorganisms, the present invention adopts Bacillus pasteurianum, adopts fermentation tank to cultivate. Fill the fermenter with pure water, and add the following substances per liter of water to prepare a culture medium solution: 20g / L of yeast extract, 10g / L of ammonium sulfate, 2g / L of sod...

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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 ...

Claims

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Application Information

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IPC IPC(8): E04B1/682
Inventor 贾强张鑫
Owner SHANDONG JIANZHU UNIV
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