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A microbial grouting method to increase the early deposition of calcium carbonate

A sedimentation and microbial technology, applied to underwater structures, water conservancy projects, artificial islands, etc., can solve the problems of effectively sealing concrete cracks and low early sediment production, so as to increase the total production and reduce the amount and frequency of grouting , Improve the effect of early yield

Active Publication Date: 2018-02-23
SHANDONG JIANZHU UNIV
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  • Abstract
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  • Application Information

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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.
[0007] 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 were sealed by using the Bacillus pasteurian bacteria solution mixed with the compound solution containing urea and mineral calcium salts, but there was a problem of low early yield of deposits, and concrete cracks could not be effectively sealed in a short period of time, often The problem of multiple grouting

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  • A microbial grouting method to increase the early deposition of calcium carbonate
  • A microbial grouting method to increase the early deposition of calcium carbonate
  • A microbial grouting method to increase the early deposition of calcium carbonate

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Embodiment 1

[0029] The present invention is based on the mechanism of microorganism-induced deposition of calcium carbonate, and according to the results of comparative experiments, the formulation of the grouting material with the highest amount of calcium carbonate deposition is proposed as follows:

[0030] (1) Bacteria liquid, adopt Bacillus pasteurii (Bacillus pasteurii), the enzyme activity of the bacteria liquid needs to be greater than 1 by the conductivity method.

[0031] (2) Nutrient salt solution, which provides nutrients for the growth and reproduction of microorganisms, selects urea (CO(NH 2 ) 2 ) solution.

[0032] (3) Calcium source solution, if calcium nitrate (Ca(NO 3 ) 2 ) solution, the concentration is 2mol / L; if calcium chloride solution (Cacl 2 ) solution with a concentration of 3mol / L.

[0033] (4) Add urea to the bacterial solution 1 hour in advance, and the urea concentration is 4.5mol / L. Adding urea to the bacterial solution in advance can increase the earl...

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Abstract

The invention discloses a microbial grouting method for increasing the early deposition of calcium carbonate, which comprises the following steps: 1) adding a nutrient salt solution to the microbial bacterial liquid to obtain a mixed liquid of the bacterial liquid and the nutrient salt, and standing for 0.5 to 1 hour; 2. ) When grouting, mix the mixture of bacteria solution and nutrient salt with the calcium salt solution in a predetermined ratio. The use of this microbial grouting material can not only effectively increase the total production of calcium carbonate deposits, but also effectively increase the early production of deposits, which is of great significance for the use of grouting methods to seal concrete cracks: only a large amount of calcium carbonate deposits can be produced in a relatively short period of time. Seals concrete cracks in a short period of time, thus reducing the amount and frequency of grouting.

Description

technical field [0001] The invention belongs to the field of concrete pouring, and relates to a microbial grouting method for increasing the early deposition of calcium carbonate. Background technique [0002] For various cracks in concrete, epoxy resin is usually used to seal them, which can prevent the air from entering the concrete and cause the steel bars to rust. However, epoxy resin is an organic material, which is easy to age over time, and the material is highly viscous, so it is not easy to pour into small cracks. [0003] The technology of microbe-induced calcium carbonate deposition to seal cracks came into being under such circumstances. It is composed of a series of complex biochemical reactions: some basophilic microorganisms can use their own urease to decompose urea into NH 3 and CO 2 , with the increase in the amount of ammonia generated by decomposition will cause the pH of the surrounding environment to rise, making CO 2 in solution with CO 3 2- form ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D15/00E02D29/16
Inventor 贾强张鑫陈晓瀚
Owner SHANDONG JIANZHU UNIV
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