Microorganism grouting method capable of improving early-stage calcium carbonate deposit volume

A technology of sedimentation and calcium carbonate, applied in underwater structures, water conservancy projects, artificial islands, etc., can solve the problems of low early yield of sediments, effectively plug concrete cracks, etc., to increase the total yield, reduce the amount of grouting and number of times, the effect of improving early yield

Active Publication Date: 2015-08-05
SHANDONG JIANZHU UNIV
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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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  • Microorganism grouting method capable of improving early-stage calcium carbonate deposit volume
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  • Microorganism grouting method capable of improving early-stage calcium carbonate deposit volume

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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 microorganism grouting method capable of improving an early-stage calcium carbonate deposit volume, which comprises the following steps: (1) a nutritive salt solution is added into a microorganism bacterium liquid to obtain a mixed liquid of bacterium liquid and nutritive salt, and standing is carried out for 0.5-1h; and (2) during grouting, the mixed liquid of bacterium liquid and nutritive salt is blended with a calcium salt solution according to a predetermined proportion. Due to the adoption of a microorganism grouting material, not only is the total output of calcium carbonate sediment effectively improved, but also the early-stage output of the sediment is can be effectively improved, so that important significance is provided for blocking concrete cracks by utilizing a grouting method. Only a lot of calcium carbonate sediment is generated in relatively short time, the concrete cracks can be blocked in relatively short time, and thus grouting amount and times can be reduced.

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 Applications(China)
IPC IPC(8): E02D15/00E02D29/16
Inventor 贾强张鑫陈晓瀚
Owner SHANDONG JIANZHU UNIV
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