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A subway engineering concrete containing microbial capsules capable of continuous self-healing

A microbial and concrete technology, applied in the direction of being fixed on or in an inorganic carrier, or on or in an organic carrier, can solve the problems of strength effect, poor adhesion, easy to be washed away, etc., to achieve good resistance The effect of compressive strength, large adsorption capacity and strong adhesion

Inactive Publication Date: 2018-08-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its mechanism is that the crack penetrates the composite capsule, and the microorganisms are released to metabolize to generate carbon dioxide to react with calcium ions to form calcium carbonate to repair the crack. Second, the capsule can only be used once, and cannot continuously repair the cracks at the same position in the concrete; third, the outer surface of the capsule is a smooth structure, which has poor adhesion to the concrete, and it is easy to Washed away, unable to repair

Method used

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  • A subway engineering concrete containing microbial capsules capable of continuous self-healing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare microbial capsules:

[0028] Step 1: Cultivate Bacillus lysinus, and obtain the sludge after centrifugation, the concentration of the sludge is 6×10 9 a / ml;

[0029] Step 2, configure anhydrous Bacillus lysinus, tryptone 510g, soybean peptone 90g, glucose 75, NaCl 150g; dipotassium hydrogen phosphate 25g;

[0030] Step 3. Add all the medium and 0.1ml of bacteria sludge prepared in step 2 into 1200ml of water and stir evenly to obtain a mixed solution;

[0031] Step 4. After adding 100 g of macroporous adsorption resin to the mixed solution obtained in step 3, stir at a speed of 250 r / min for 30 minutes, filter and collect the macroporous adsorption resin, and dry at 20°C until the water content is lower than 5%;

[0032] Step 5. Place the dried macroporous adsorbent resin in 90%wt alcohol for the first soaking for 30 minutes, and then evenly spray 20% cement liquid on its surface to make the thickness 0.3mm. Dry at ℃, spray again the mixed solution of cement ...

Embodiment 2

[0036] Prepare microbial capsules:

[0037] Step 1. Cultivate Bacillus lysinus or Bacillus cereus, centrifuge to obtain the sludge, the concentration of the sludge is 6×10 9 a / ml;

[0038] Step 2, configure anhydrous aerobic alkalophilic bacillus culture medium, tryptone 510g, soybean peptone 90g, glucose 75, NaCl 150g; dipotassium hydrogen phosphate 25g;

[0039] Step 3. Add all the medium and 0.1ml of bacteria sludge prepared in step 2 into 1500ml of water and stir evenly to obtain a mixed solution;

[0040] Step 4. After adding 100 g of macroporous adsorption resin to the mixed solution obtained in step 3, stir at a speed of 250 r / min for 20 minutes, filter and collect the macroporous adsorption resin, and dry at 30°C until the water content is lower than 5%;

[0041] Step 5. After soaking the dried macroporous adsorption resin in 100%wt alcohol for 50 minutes once, spray the cement liquid with a mass fraction of 25% evenly on the surface to make the thickness 0.8mm, and ...

Embodiment 3

[0044] Prepare microbial capsules:

[0045] Step 1: Cultivate Bacillus cereus, obtain the sludge after centrifugation, and the concentration of the sludge is 4×10 9 a / ml;

[0046] Step 2. Configure anhydrous M.S.P medium, NaNO 3 9g, K 2 HPO 4 3g, KCI1.5g, MgSO 4 1.5g, FeSO 4 , 0.03g, 90g of sucrose;

[0047] Step 3. Add all the medium and 0.1ml of bacteria sludge prepared in step 2 into 180ml of water and stir evenly to obtain a mixed solution;

[0048] Step 4: After adding 15 g of macroporous adsorbent resin to the mixed solution obtained in step 3, stir at a speed of 250 r / min for 30 minutes, filter and collect the macroporous adsorbent resin, and dry at 30°C until the water content is lower than 5%;

[0049] Step 5. After soaking the dried macroporous adsorption resin in 100%wt alcohol for 40min once, spray the cement liquid with a mass fraction of 25% on the surface evenly to make the thickness 0.5mm, and dry it at 30°C Dry in the box, spray again the mixed solutio...

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Abstract

The invention discloses a subway engineering concrete containing microbial capsules capable of continuous self-repair, and relates to the technical field of concrete repair. The concrete is C30 concrete, which contains the following raw materials in parts by weight: 266 parts of cement, 114 parts of fly ash, and 718 parts of sand 592 parts of fine gravel, 484 parts of small gravel, 157 parts of water, 33 parts of HLC anti-crack and anti-seepage agent, and 15‑20 parts of microbial capsules. The concrete of the present invention can replace manual work to solve the water seepage problem of underground engineering in a long period of time, and its repairing power is better, up to 99%. Therefore, the concrete of the present invention has greater economic benefits and market potential.

Description

technical field [0001] The invention relates to the technical field of concrete repair, in particular to a subway engineering concrete containing microbial capsules capable of continuous self-repair. Background technique [0002] Dealing with the cracking of active concrete structures is a common technical problem in the field of civil engineering. All countries in the world have limits on the allowable crack width. For example, the technical standards of the United States and New Zealand allow a crack width of 0.4mm (in a dry environment), and our country is 0.2-0.3mm. The appearance of cracks affects the safety and applicability of the structure. If there are cracks in underground engineering, water seepage will occur, which will seriously affect the use of underground engineering; and cracks in office buildings, residential beams, columns, walls, etc. will not only affect the appearance and life of the building, but also threaten people's lives and property Safety. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/00C04B20/12C12N11/14C12N11/02
CPCC12N11/02C12N11/14C04B20/12C04B24/00C04B28/00C04B2201/50C04B18/08C04B14/06C04B14/02C04B2103/0068C04B2103/0001C04B20/1077C04B20/107
Inventor 唐禄博王丽丽秦磊赵慷慨张华玮林凡通李壮壮孙明悦王鹏飞
Owner UNIV OF JINAN
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