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Materials and methods for repairing concrete cracks based on mineralized deposition of facultative aerobic bacteria

A facultative aerobic and repairing material technology, applied in building maintenance, construction, building construction, etc., to achieve the effects of enhanced stability, easy preservation, and strong resistance to environmental impact

Active Publication Date: 2022-02-22
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The invention solves the above-mentioned defects and problems existing in the existing concrete crack repair method based on pure bacteria mineralization deposition, and provides a concrete crack repair material and method based on facultative aerobic mixed bacteria mineralization deposition

Method used

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preparation example Construction

[0038] c. Preparation of selective culture medium; aerobic microorganism selective culture medium: ultrapure water 1L, sodium lactate 0.85g, ammonium chloride 0.02g, trace element solution 10mL; anaerobic microorganism selective culture medium: ultrapure water 1L, sodium lactate 0.85g, sodium nitrate 0.03g, trace element solution 10mL;

[0039] d. Facultative aerobic mixed bacteria culture; the facultative aerobic mixed bacteria culture method is divided into two stages, that is, the enhancement of aerobic characteristics and the enhancement of anaerobic characteristics; aerobic cultivation is carried out first, and then anaerobic cultivation is carried out, which is a cycle , continuous culture for 10 cycles;

[0040] Characteristic enhancement process: Add 10mL of sludge mixture and 100mL of aerobic microbial selection culture solution into a 300mL conical flask at a ratio of 1:10, and use Na 3 PO 4 Adjust the pH to 11, cover the mouth of the bottle with sterile cotton gau...

Embodiment 1

[0050] In this embodiment, the 1mm wide crack at the water seepage of the building floor is repaired.

[0051] The required materials are prepared by mixing solution A and solution B at a ratio of 1:1; among them,

[0052] Solution A: 1L ultrapure water, 9g tryptone, 5g yeast extract, 10g sodium chloride, adjust pH to 7.0 with 5mol / L NaOH, facultative aerobic mixed bacteria 1.6×10 7 a / L;

[0053] Solution B: 1L ultrapure water, 14g calcium lactate, 14g calcium nitrate, 4000g standard sand;

[0054] The facultative aerobic mixed bacteria used in the solution A is obtained by the following method:

[0055] a. Select the activated sludge of the sewage treatment plant and the garden mud as separate inoculation sources; the garden mud refers to the soil in the park; after the activated sludge of the sewage treatment plant and the garden mud are mixed, distilled water is added to prepare a sludge mixture;

[0056] b. Preparation of trace element solution, ultrapure water 1L, vita...

Embodiment 2

[0070] In this embodiment, the 1.4mm wide crack at the seepage of the building wall is repaired.

[0071] The required materials are prepared by mixing solution A and solution B at a ratio of 1:1; among them,

[0072] Solution A: 1L ultrapure water, 11g tryptone, 6g yeast extract, 11g sodium chloride, adjust pH to 7.0 with 5mol / L NaOH, facultative aerobic mixed bacteria 2.0×10 7 a / L;

[0073] Solution B: 1L ultrapure water, 15g calcium lactate, 15g calcium nitrate, 4700g standard sand;

[0074] The facultative aerobic mixed bacteria used in the solution A is obtained by the following method:

[0075] a. Select the activated sludge of the sewage treatment plant and the garden mud as separate inoculation sources; the garden mud refers to the soil in the park; after the activated sludge of the sewage treatment plant and the garden mud are mixed, distilled water is added to prepare a sludge mixture;

[0076] b. Preparation of trace element solution, ultrapure water 1L, vitamin ...

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Abstract

The invention relates to a concrete crack repair material and method, in particular to a concrete crack repair material and method based on the mineralization deposition of facultative aerobic mixed bacteria. The method solves the problems that the repair efficiency of the existing concrete crack repair method based on pure bacteria mineralization deposition is significantly reduced in an anoxic environment, and the preparation process of pure bacteria is relatively expensive. The invention provides a concrete crack repair material and method based on the mineralization deposition of facultative aerobic mixed bacteria. The facultative aerobic mixed bacteria can grow in an aerobic or anaerobic environment, and generally aerobic growth is the main method. , aerobic respiration under aerobic conditions, and anaerobic respiration or fermentation under hypoxic or anaerobic conditions. Therefore, facultative aerobic mixed bacteria are more suitable for actual concrete structures, and are beneficial to crack repair in the direction of crack depth.

Description

technical field [0001] The invention relates to a concrete crack repair material and method, in particular to a concrete crack repair material and method based on the mineralization deposition of facultative aerobic mixed bacteria. Background technique [0002] Concrete has the advantages of high compressive strength, good durability, and low cost. It is currently the most widely used and used building material in the field of civil engineering. However, as a heterogeneous material, concrete is prone to local damage such as micro cracks during construction and service. Cracks in concrete structures are inevitable. If effective measures are not taken in time, these tiny cracks may further expand and eventually form wide cracks, providing channels for corrosive substances. The entry of corrosive substances will reduce the durability of concrete. Especially in cracks with water seepage problems in humid environments, the steel bars inside will be severely corroded, thus affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00E04G23/02C12N1/02C04B111/72
CPCC04B30/00C12N1/02E04G23/0203E04G23/0211C04B2111/72
Inventor 张家广陈景琦周爱娟刘元珍
Owner TAIYUAN UNIV OF TECH
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