Bionic self-repairing concrete and preparation method thereof

A concrete, self-healing technology, applied in glass manufacturing equipment, manufacturing tools, glass molding, etc., can solve the problems of restricted diffusion, reduction of concrete strength, concrete strength damage, etc., and achieves highly ordered pore structure, uniform pore size distribution, The effect of improving mechanical strength

Active Publication Date: 2019-11-01
GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practical application of microbial self-healing concrete still faces many problems, mainly including the following points: 1) Most of the concrete is in a high-alkaline and harsh environment, and the microorganisms are directly mixed into the concrete, and the premature death of the microorganisms fails to exert the repairing effect
2) In the tiny cracks deep in the concrete, the permeability of oxygen and water is not good, and it is difficult for microorganisms to activate in the environment of lack of oxygen and water, and the repair effect cannot be exerted
4) After microbial activation, the metabolic function is restored, and carbon dioxide is produced by respiration. In a humid environment, carbon dioxide reacts with calcium ions in cement-based materials to form calcium carbonate, which is used to fill cracks. Calcium ions, which will lead to a decrease in the stability of the concrete structure
5) Use microcapsules to load microorganisms for repair. Once the microcapsules break and release the microorganisms, they will leave holes...

Method used

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  • Bionic self-repairing concrete and preparation method thereof
  • Bionic self-repairing concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of Mesoporous Bioactive Glass Microspheres

[0028] The preparation of mesoporous bioactive glass microspheres by template method specifically includes the following steps:

[0029] (1) The triblock copolymer Pluronic F127 (molecular formula is EO 106 PO 70 EO 106 , EO is ethylene oxide, PO is propylene oxide; average molecular weight 12600) is dissolved in the mixed solvent (the volume ratio of absolute alcohol and glacial acetic acid is 5:2) that absolute ethanol and glacial acetic acid form, described The mixing ratio of Pluronic F127 and mixed solvent is 1g:25mL, stir and mix well to obtain mixed solution A.

[0030] (2) Add 100g of the oxide precursor mixture to 400g of the mixed solution A obtained in step (1), stir and dissolve to obtain the mixed solution B, the oxide precursor mixture is composed of 51.19g calcium nitrate tetrahydrate, 18.33g normal Methyl silicate, 27.11g aluminum nitrate nonahydrate, 3.37g trimethyl phosphate, the mi...

Embodiment 2

[0032] Example 2 Preparation of Mesoporous Bioactive Glass Composite Microspheres

[0033] The preparation of mesoporous bioactive glass composite microspheres comprises the following steps:

[0034] (1) Inoculate the aerobic type alkali-resistant Bacillus (Bacillus cohnii DSM 6307) on the medium (each liter of medium contains 4.5g peptone, 30g maltodextrin, 10g ammonium chloride, 2g sodium citrate, 1g magnesium sulfate, The balance is water, the pH value is 9-10), shake culture at room temperature for 72 hours to obtain the bacterial liquid, centrifuge the bacterial liquid at 4000r / min for 20min to obtain the bacterial sludge, and resuspend the bacterial sludge with the culture medium to obtain The concentration is (4~5)×10 7 Bacteria liquid of each / mL; Mesoporous bioactive glass microspheres (prepared in Example 1) and the bacterium liquid are impregnated according to the ratio of 1g:2.5mL by vacuum impregnation method, and dried at 35°C to obtain internal loads with Mesop...

Embodiment 3

[0036] Embodiment 3 preparation of calcium peroxide microspheres

[0037] The preparation of calcium peroxide microspheres comprises the following steps: polybutylene succinate is dissolved in chloroform to make a solution with a mass fraction of 5%, and then evenly sprayed on the surface of calcium peroxide to make polybutylene succinate The thickness of the film layer of the glycol ester is 20nm, vacuum drying and recovery of chloroform to obtain calcium peroxide microspheres.

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PUM

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Abstract

The invention discloses bionic self-repairing concrete and a preparation method thereof. The bionic self-repairing concrete is characterized by being prepared from the following raw materials in partsby weight: 240 to 360 parts of cement, 180 to 250 parts of active admixture, 1300 to 1600 parts of aggregate, 60 to 90 parts of mesoporous bioactive glass composite microspheres, 20 to 30 parts of calcium peroxide microspheres, 20 to 30 parts of carbon nanotubes, 8 to 16 parts of polycarboxylate water reducing agent and 190 to 220 parts of water. The bionic self-repairing concrete provided by theinvention has a rapid self-repairing capability, can continuously and automatically repair micro-cracks or micro-damages of different deep layers in the concrete, promotes the continuous increase ofthe matrix strength after crack repairing, and improves the strength and durability of the concrete. The self-repairing concrete has the advantages of being wide in repairing range, rapid in repairingand lasting in repairing.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a bionic self-repairing concrete and a preparation method thereof. Background technique [0002] The inherent defect of high brittleness of concrete materials seriously affects its crack resistance. Microscopic damage such as micro-cracks of the matrix often occurs in actual engineering, and such micro-cracks are usually invisible, let alone repaired. If these damaged parts cannot be repaired in time, it will not only affect the strength and durability of the concrete material, affect the normal performance of the structure and shorten the service life, but also may cause macroscopic cracks and brittle fractures, resulting in serious catastrophic accidents. The repair form of traditional concrete materials is mainly regular maintenance and after-event maintenance. This negative and passive maintenance method is not only expensive, but also ineffective, and it cannot m...

Claims

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Application Information

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IPC IPC(8): C03B19/10C03B19/06C03C11/00C03C3/062C03C23/00C03C17/32C04B20/10C04B18/02C04B20/02C04B28/00C04B14/02C04B22/06
CPCC03B19/06C03B19/108C03C3/062C03C11/007C03C17/32C03C23/0095C04B14/026C04B18/027C04B20/02C04B20/1033C04B20/1037C04B22/068C04B28/00C04B2201/50C04B18/08C04B18/141C04B14/068C04B14/02C04B2103/0001C04B2103/302C04B22/002C04B18/145C04B18/146
Inventor 谢祥明余青山姚楚康胡磊李意赵雅玲邱晓艳
Owner GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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