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Surface pre-coating method for crack self-repairing of cement-based material

A cement-based material and self-repairing technology, applied in the field of interdisciplinary science, can solve problems such as steel bar damage, shorten the service life of concrete structures, economic losses and hidden safety hazards, and achieve the goal of improving structural durability, saving crack detection and manpower repair costs Effect

Active Publication Date: 2017-05-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of cracking can be called the "cancer" of cement-based materials and has always troubled many cement concrete researchers
Cement-based materials are prone to cracks during use and under the influence of the surrounding environment, so that corrosive media can easily invade into the material, causing damage to the concrete itself and the pre-embedded steel bars, greatly shortening the use of concrete structures Life expectancy, causing huge economic losses and potential safety hazards
[0003] Traditional repair methods such as inorganic repair and organic repair are widely used, but due to the complex structure of concrete and the difficulty of detecting small cracks, repairing cracks becomes time-consuming, laborious and expensive

Method used

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  • Surface pre-coating method for crack self-repairing of cement-based material
  • Surface pre-coating method for crack self-repairing of cement-based material
  • Surface pre-coating method for crack self-repairing of cement-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 10g of sucrose, Na 2 HPO 4 12H 2 O 2g, MgSO 4 0.5g, CaCO 3 1.0g, KCl0.2g, (NH 4 ) 2 SO 4 Dissolve 0.5g and 0.3g of yeast extract in deionized water, prepare the required medium solution, adjust the pH to 7, and sterilize at 125°C for 25 minutes, inoculate Bacillus colioids into the cooled medium solution, Shake culture at 35°C for 12h, the shaking frequency is 170r / min, and the culture time is 24h;

[0036] (2) Centrifuge the cultured bacteria solution at high speed for 10 minutes, the speed of the centrifuge is 8000rpm, and the temperature is controlled at 4°C. After removing the upper layer of medium, add deionized water, and then place it in a freeze dryer at -10°C to dry into bacteria. powder spare;

[0037] (3) Prepare Bacillus colioids powder into 0.5g / mL bacterial liquid, add hydrophilic thickener sodium alginate to the bacterial liquid, and the concentration of the hydrophilic thickener in the bacterial liquid is 0.3g / mL ; At this time, the st...

Embodiment 2

[0042] (1) Weigh 12g of sucrose, Na 2 HPO 4 12H 2 O 3g, MgSO 4 0.6g, CaCO 3 0.8g, KCl 0.3g, (NH 4 ) 2 SO 4 Dissolve 0.3g and 0.2g of yeast extract in deionized water, configure the required medium solution, and adjust the pH to 8, sterilize at 125°C for 25min, inoculate Bacillus colioids into the cooled medium solution, Shake culture at 35°C for 12h, the shaking frequency is 170r / min, and the culture time is 24h;

[0043] (2) Centrifuge the cultured bacteria solution at high speed for 10 minutes, the speed of the centrifuge is 8000rpm, and the temperature is controlled at 4°C. After removing the upper layer of medium, add deionized water, and then place it in a freeze dryer at -10°C to dry into bacteria powder spare;

[0044] (3) Prepare Bacillus colioids powder as 1.0g / mL bacterial liquid, add hydrophilic thickener sodium alginate to the bacterial liquid, and the concentration of the hydrophilic thickener in the bacterial liquid is 0.5g / mL , the strain concentration...

Embodiment 3

[0049] (1) Weigh 11g of sucrose, Na 2 HPO 4 12H 2 O 2g, MgSO 4 0.6g, CaCO 3 1.5g, KCl 0.3g, (NH 4 ) 2 SO 4 Dissolve 0.6g and 0.4g of yeast extract in deionized water, configure the required medium solution, adjust the pH to 7, and sterilize at 125°C for 25 minutes, inoculate Bacillus colloidus into the cooled medium solution, Shake culture at 35°C for 12h, the shaking frequency is 170r / min, and the culture time is 24h;

[0050] (2) Centrifuge the cultured bacteria solution at high speed for 10 minutes, the speed of the centrifuge is 8000rpm, and the temperature is controlled at 4°C. After removing the upper layer of medium, add deionized water, and then place it in a freeze dryer at -10°C to dry into bacteria. powder spare;

[0051] (3) Prepare Bacillus colioids powder into 0.8g / mL bacterial liquid, add hydrophilic thickener sodium alginate to the bacterial liquid, and the concentration of the hydrophilic thickener in the bacterial liquid is 0.8g / mL , the strain co...

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PUM

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Abstract

The invention discloses a surface pre-coating method for crack self-repairing of a cement-based material. The method comprises the following steps: (1) preparing bacteria liquid from nutrient immobilized bacillus mucilaginosus powder; (2) adding a hydrophilic thickening agent into the bacteria liquid to obtain repairing liquid; (3) preparing weak-acid pretreatment liquid; and before spraying the repairing liquid, spraying the weak-acid pretreatment liquid to the surface of the cement-based material; and (4) after spraying the weak-acid pretreatment liquid to the surface of the cement-based material for 10min, spraying the repairing liquid. The repairing test result indicates that calcium carbonate can be precipitated at the crack of the cement-based material within 7d; and after 30d of continuous repairing, microcracks with average crack width below 0.4mm can be completely repaired.

Description

technical field [0001] The invention belongs to the interdisciplinary science and technology in the fields of microbiology and civil engineering materials, and in particular relates to a coating method of a microbial self-repairing agent. Background technique [0002] Cement-based materials are currently the most widely used building materials, and have already become the most important building materials today and for a long time to come. However, the problem of cracking can be called the "cancer" of cement-based materials and has always troubled many cement concrete researchers. Cement-based materials are prone to cracks during use and under the influence of the surrounding environment, so that corrosive media can easily invade into the material, causing damage to the concrete itself and the pre-embedded steel bars, greatly shortening the use of concrete structures Life expectancy, causing huge economic losses and potential safety hazards. [0003] Traditional repair met...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/00C04B41/62E04G23/02
CPCC04B40/0039C04B41/009C04B41/4572C04B41/4803C04B41/62E04G23/0203C04B2103/0001C04B2103/44C04B24/38C04B41/53C04B28/00
Inventor 钱春香艾果果伊海赫
Owner SOUTHEAST UNIV
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