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Concrete crack bioremediation method

A technology of bioremediation and concrete, which is applied in building maintenance, building construction, construction, etc., to achieve the effect of environmental friendliness and strength recovery

Pending Publication Date: 2021-10-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, after a patent search, there is no research on the use of Bacillus pasteurianum to repair concrete cracks

Method used

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  • Concrete crack bioremediation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The present invention provides a method of concrete crack repair, the method by sequentially immersing the concrete crack in the concrete solution, urea solution, and soluble calcium salt solution, excess liquid from the concrete crack, and after 1 hour, Repeated operation to repair concrete cracks.

[0031] The concentration of the soluble calcium salt solution was 1 mol / L.

[0032] The concentration of the urea solution was 1 mol / L.

[0033] The Bacillus solution, urea solution, and soluble calcium salt solution are the same.

[0034] The soluble calcium salt solution is CA (NO 3 ) 2 Solution.

[0035] The culturing temperature of the Bacillus bacillus solution was 20 ° C, and the culture time was 16 hours.

Embodiment 2

[0037] The production process flow used in the present invention is figure 1 As shown, the technical solutions employed are as follows:

[0038] Bacterial activation culture: Pakunar bio-purchased Pastelioprostophilus, activation, inverted flat plate, expanded culture;

[0039] Determine the optimum temperature and optimal culture of bacterial growth: Culture Bacillus in 6 temperatures (0 ° C, 5 ° C, 10 ° C, 20 ° C, 30 ° C and 40 ° C), plotted growth curves to obtain bacteria The best culture temperature is 20 ° C and the best culture time is 15-18 hours, and the result is figure 2 Indicated;

[0040] Determine the optimum concentration and proportion of urea solution and calcium nitrate solution: design three groups of experiments, the first group of 10 ml of 1 mol / L urea solution, 10ml 1 mol / L CA (NO 3 ) 2 Solution and 10 ml bacterial solution, the second group is 10 ml of 2 mol / L urea solution, 10 ml of 2 mol / L of CA (NO 3 ) 2 Solution and 10 ml bacterial solution, the ...

Embodiment 3

[0049] Bacillus Activation of Bacillus Bacillus: Italy Bacillus Pakistani Pakistani Pakistanus Bacillus Freescent Fluid, Activated, Inverted Tablet, Expanded Culture;

[0050] Bacillus Bacillus were cultured at 20 ° C for 15 hours;

[0051] Urea solution, CA (NO 3 ) 2 The best reaction ratio of the solution and bacterial solution is: the first group of 10 ml 1 mol / L urea solution, 10 ml of 1 mol / L of CA (NO 3 )2 Solution and 10 ml of bacterial solution;

[0052] Clean concrete crack: First put the concrete test piece under the faucet, to remove some of the debris in the crack, then use the plug to scratch some other debris, and then place the concrete specimen in the faucet, and finally at room temperature. Dry; paste the waterproof tape at the bottom of the crack. The action of waterproof tape is to pass excess water, and the repair material is retained in the crack;

[0053] Urea solution, CA (NO 3 ) 2 Solution and bacterial solution grout: inject the bacterial solution to b...

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Abstract

The invention provides a concrete crack bioremediation method. The concrete crack bioremediation method comprises the following steps that a bacillus pasteurii solution, a urea solution and a soluble calcium salt solution are sequentially injected into a concrete crack, operation is stopped after excessive liquid seeps from the concrete crack, and the operation is repeated after 1 hour, and therefore the concrete crack is repaired. According to the method, urea is decomposed by using bacillus pasteurii, and then calcium carbonate precipitates are generated in the presence of the calcium source, so that concrete cracks are repaired. Bacteria, urea and soluble calcium salt are used as raw materials for producing calcium carbonate, and the raw materials are cheap and easy to obtain. The bacterial remediation process is simple and easy to operate, and the calcium carbonate production process is a biological process and is environmentally friendly.

Description

Technical field [0001] The present invention belongs to the field of concrete crack repair, and in particular, the present invention relates to a method of decomposing urea inducing calcium carbonate precipitation by Pastelikarium to repair concrete cracks. Background technique [0002] Concrete is one of the most important building materials in the world. However, the tensile strength of the concrete is low, and cracks can inevitably produce. After the concrete crack occurs, many hazardous substances such as acids, alkali, gases, and water use a single mechanism or integrated mechanism such as diffusion, capillary effect, penetration, etc., causing the corrosion and concrete structural deterioration. If other hazardous substances reach the inside of the concrete, they may react with the composition of the concrete, or directly destroy the structure of the concrete, thereby seriously affecting the durability of concrete. Therefore, how to fix an effective repair for concrete crac...

Claims

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Application Information

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IPC IPC(8): E04G23/02
CPCE04G23/0203
Inventor 加尼·阿卜杜勒·瑞泽普赵婷
Owner NANKAI UNIV
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