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Microbial self-repairing method for tunnel lining concrete cracks

A microbial remediation and microbial technology, which is applied in the intersection of microbiology and civil engineering materials, can solve the problems of reduced microbial survival and loss of self-healing effect, and achieves the effect of delaying the deterioration process, convenient operation and prolonging the effective survival period.

Active Publication Date: 2020-04-24
ROAD & BRIDGE SOUTH CHINA EINGINEERING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the continuous refinement of pores caused by the hydration reaction of cement in concrete, the microbes are squeezed and the long-term direct contact with the high-alkali environment inside the concrete results in a decrease in the number of microorganisms in the subsequent concrete crack repair process and a self-healing effect. lost

Method used

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  • Microbial self-repairing method for tunnel lining concrete cracks
  • Microbial self-repairing method for tunnel lining concrete cracks
  • Microbial self-repairing method for tunnel lining concrete cracks

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A preparation method of microbial remediation agent, its specific steps are as follows:

[0046] (1) After activating Bacillus colii, inoculate it into a liquid medium, then cultivate it for 32 hours at a temperature of 35° C. to obtain a bacterial liquid, and then centrifuge the obtained bacterial liquid with a centrifuge at a speed of 4000 r / min for 30 min to obtain Bacterial slime, the composition of the above liquid medium is: ultrapure water 1L, yeast powder 5g, trimethylglycine 4.5g, tryptone 10g, ammonium sulfate 5g, glutamic acid 2g, urea 10g;

[0047] (2) Dilute the sludge with sterilized distilled water to a concentration of 5.5×10 7 cells / mL, make a bacterial suspension, and add trioctyl phosphate and triallylamine with a content of 1wt‰ and 1wt‰ respectively, crush the carrier coral reef calcareous sand to a particle size of 2mm, and then put it into the bacterial suspension , put the bacterial suspension under the pressure of -0.07MPa and soak for 32 hours...

Embodiment 2

[0051] A microbial self-repair method for tunnel lining concrete cracks, the specific steps are as follows:

[0052] (1) Put cement, natural stone, sand, silica fume, calcium chloride, polypropylene fiber, water reducing agent and water into the mixer, and stir evenly;

[0053] (2) Then put the microbial restoration agent prepared in Example 1 into it, and then stir for 2 minutes, put the mixed concrete into the mould, and perform natural maintenance to obtain the tunnel lining concrete with the function of microbial self-repairing cracks. The weight ratio of the agent in the concrete is 13%.

Embodiment 3

[0055] A preparation method of a microbial remediation agent, the only difference between this embodiment and Example 1 is that the protective layer slurry used in step (4) also contains 0.05wt% phenylacetic acid-2-methylpropyl ester and 0.08wt% % of styrene oxide, after the two are adsorbed on the carrier, due to its hydrophobicity, the intermolecular arrangement of the protective layer material changes, and the hydrophobic group is arranged on the outermost side, which makes the hydrophilicity of the carrier significantly reduced and the hydrophobicity increased, thereby avoiding Bacteria or spores are revived in advance when they encounter water in concrete, and the dormant period is not affected by water seepage. In addition, they can also participate in the deposition of calcium carbonate after the carrier is broken, enhancing the impermeability of the cracks, and thus making the repaired concrete more resistant to freezing and thawing. The loss of compressive strength is ...

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Abstract

The invention provides a microbial self-repairing method for tunnel lining concrete cracks, and belongs to the technical field of microbiology and civil engineering material crossing. A microbial repairing agent is added into a concrete raw material to prepare tunnel lining concrete. The microbial repairing agent is prepared through the following steps: loading microbes or microbial spores in a carrier to serve as a base core material, immobilizing nutrient substances on the base core material to form a core structure, immobilizing a protective layer on the surface of the core structure, anddrying to obtain the microbial remediation agent, wherein the microbe or microbial spore loading operation is carried out in an environment in which trioctyl phosphate and triallylamine exist. The method can effectively prolong the effective survival time of microbes, has a good self-repairing effect on concrete cracks, and particularly still has a repairing effect of more than 50% on concrete with the cracking width of 0.5 mm or below after 90 days; and the water seepage repairing effect of the concrete is improved, and the impermeability of the repaired concrete is enhanced.

Description

technical field [0001] The invention belongs to the cross-technical field of microbiology and civil engineering materials, and in particular relates to a microbial self-repair method for cracks in tunnel lining concrete. Background technique [0002] Concrete is the most widely used building material in the field of civil engineering, but it is affected by factors such as temperature changes, external loads or corrosion during construction and service, and it is difficult to avoid local cracks such as micro cracks inside or on the surface of the concrete. Damage or cracks are very easy to appear, which not only affects the aesthetics of the structure, but also reduces the durability and bearing capacity of the structure, and eventually causes the structural components to be damaged. Cracks in concrete allow air and moisture to enter the structure, corrode steel reinforcement, and even chloride ion attack. [0003] Aiming at the problem of reduced durability of concrete stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/38C12N11/14C12R1/07C04B111/27C04B111/72C04B111/76
CPCC04B28/00C04B40/0039C04B2111/27C04B2111/72C04B2111/76C04B2201/50C12N11/14C04B2103/0001C04B14/28C04B14/106C04B24/38C04B22/00C04B14/02C04B14/06C04B18/146C04B16/0633C04B2103/302
Inventor 王金梁张勇王道隆李涛赖小颖黄亚娥孙浩铭
Owner ROAD & BRIDGE SOUTH CHINA EINGINEERING CO LTD
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