Compound capsule underground structure concrete self-repairing system provided with aerobic microorganisms inside

A composite capsule and underground structure technology, applied in the field of concrete engineering, can solve problems such as insufficient storage time of restoration agents, insufficient sealing performance, and no theoretical basis

Active Publication Date: 2013-04-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 6. The sealing of the traditional single-layer microcapsule wall is not good enough, so the preservation time of the repair agent is not long enough;
[0011] 7. The determination of traditional microcapsule parameters is based on experience and has no theoretical basis;
[0013] 9. Binders are not durable in groundwater environments

Method used

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  • Compound capsule underground structure concrete self-repairing system provided with aerobic microorganisms inside
  • Compound capsule underground structure concrete self-repairing system provided with aerobic microorganisms inside
  • Compound capsule underground structure concrete self-repairing system provided with aerobic microorganisms inside

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Microbial composite capsules were prepared by interfacial polymerization. First configure the culture medium containing alkalophilic bacillus, the concentration of alkalophilic bacillus is 10 9 cell / ml, add 6g / L sodium citrate, 5g / L peptone, 3g / L yeast extract, 0.2g / L ammonium chloride, 0.02g / L potassium dihydrogen phosphate, 0.225g / L calcium chloride, 0.2 g / L potassium chloride, 0.2g / L magnesium chloride hexahydrate.

[0099] At 30°C, 5g TDI (toluene diisocyanate), 1g PPG2000 (polypropylene glycol 2000) and different quality media were added to 200mL distilled water containing 1.5g emulsifier SMA (styrene maleic anhydride copolymer) and heated at 4500r / Continue to stir for 10min at the speed of min-5000r / min, and continue to stir for 5min at 400r / min-800r / min, then slowly add 20ml of aqueous solution containing 2gDETA (diethylenetriamine) to the above system, keep the reaction for 30min, continue Raise the temperature to 60°C and keep it warm for 3 hours to promote ...

Embodiment 2

[0104] Referring to the method in Example 1, experiments were carried out on Bacillus subtilis, Azotobacter sp., nitrifying bacteria, and Brevibacterium flavum. The specific experimental conditions are shown in Table 1.

[0105] Table 1

[0106]

[0107] Refer to the steps of Example 1 for the compound capsules of the obtained Bacillus subtilis, nitrogen-fixing bacteria, nitrifying bacteria, and Brevibacterium flavum to prepare the corresponding concrete containing microbial compound capsules, and then carry out the same initial damage test as in Example 1 After observing the experimental results, it was found that calcite crystals were produced on the surface of the concrete cracks in the composite capsules of the four microorganisms, and the longer the curing time, the more calcite crystals. The greater the initial damage, the more calcite crystals.

[0108] It can be seen that after the microbial composite capsule in the concrete is broken, the calcite precipitation gen...

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Abstract

The invention relates to the field of concrete engineering, in particular to a compound capsule underground structure concrete self-repairing system provided with aerobic microorganisms inside. The system comprises a concrete matrix, wherein microorganism compound capsules are arranged in the concrete matrix; and the aerobic microorganisms and culture mediums suitable for the growth of the aerobic microorganisms are coated in the microorganism compound capsules. Compared with the existing microorganism self-repairing system and the microcapsule self-repairing system containing repairing agent, the compound capsule underground structure concrete self-repairing system provided with the aerobic microorganisms inside has no need to be additionally provided with the culture mediums, and concrete can achieve intelligent repairing.

Description

technical field [0001] The invention relates to the field of concrete engineering, in particular to a composite capsule underground structure concrete self-repair system with built-in aerobic microorganisms. Background technique [0002] The design life of the urban rail transit tunnel structure is 100 years. The rock and soil conditions in which it is located are complex, the surrounding environment is sensitive, the train running density is extremely high, and the service conditions are harsh. Or cannot be replaced, and will induce underground engineering disasters. Cracks in cement-based materials are the root cause of premature structural failure. The microbial self-healing system provides a new method for the repair of micro-cracks in the concrete matrix and effectively delays potential damage. A self-healing system will eliminate the high cost of effective monitoring and external repair, and avoid the need for manual repair. It can save the operating cost of the stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B103/60
Inventor 闫治国朱合华周帅陈庆
Owner TONGJI UNIV
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