Sprayed concrete with microorganism crack self-repairing capacity and preparation method of sprayed concrete

A technology of shotcrete and self-repair, which is applied in the field of concrete materials, can solve problems such as the complicated repair process of shotcrete cracks, the difficulty of diagnosing and repairing micro-cracks, etc., and achieve the effects of avoiding adverse effects, low price and stable performance

Inactive Publication Date: 2018-05-11
李珠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main repair methods for shotcrete cracks are post-event repair or regular repair. However, shotcrete is mainly used in tunnel engineering, underground engineering and other engineering fields, which makes the repair process of shotcrete cracks more complicated, and this passive and planned repair Most

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A self-healing shotcrete for microbial cracks, made of the following raw materials in parts by weight: 80 parts of expanded perlite loaded with microorganisms and nutrients, 400 parts of cement, 800 parts of stones, 900 parts of sand, 30 parts of silica fume, water 150 parts, 3 parts of polycarboxylate superplasticizer, 0.9 parts of polypropylene fiber, 30 parts of sodium aluminate liquid accelerator.

[0038] The preparation method of carrier particles comprises the following technological process:

[0039] Vector preparation:

[0040] (1) Select Bacillus courier, purify and cultivate the strain; prepare the culture medium of Bacillus courier (the content of each component per liter: distilled water 1L, peptone 5g, beef extract 3g); use 1mol / L times and a half Sodium carbonate sterile solution (the content of each component per liter: sodium bicarbonate 42g, anhydrous sodium carbonate 53g) Adjust the pH value of the above medium to 9.0, sterilize at 121°C for 30min, a...

Embodiment 2

[0050] A self-healing shotcrete for microbial cracks, made of the following raw materials in parts by weight: 90 parts of expanded perlite loaded with microorganisms and nutrients, 410 parts of cement, 850 parts of stones, 1050 parts of sand, 32 parts of silica fume, water 170 parts, 4 parts of polycarboxylate superplasticizer, 1.0 parts of polypropylene fiber, 31 parts of sodium aluminate liquid accelerator.

[0051] Select Bacillus pasteurii, purify and cultivate the strain; prepare the culture medium of Bacillus pasteurii (distilled water 1L, yeast powder 5g, trimethylglycine 4.5g, tryptone 10g, ammonium sulfate 5g, glutamic acid 2g, urea 10g ).

[0052] All the other implementation steps are the same as in Example 1.

Embodiment 3

[0054] A self-healing shotcrete for microbial cracks, made of the following raw materials in parts by weight: 100 parts of expanded perlite loaded with microorganisms and nutrients, 420 parts of cement, 900 parts of stones, 1100 parts of sand, 34 parts of silica fume, water 190 parts, 5 parts of polycarboxylate superplasticizer, 1.2 parts of polypropylene fiber, 32 parts of sodium aluminate liquid accelerator.

[0055] The microorganisms used were self-screened aerobic basophilic bacteria; prepared microbial culture medium (distilled water 1L, tryptone 10g, yeast extract 5g, sodium chloride 10g).

[0056] All the other implementation steps are the same as in Example 1.

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PUM

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Abstract

The invention discloses sprayed concrete with microorganism crack self-repairing capacity and a preparation method of the sprayed concrete. The sprayed concrete is prepared from components as follows:self-repairing particles carrying a microorganism repair agent and nutrients, cement, pebbles, sand, silica fume, water, polypropylene fibers, a sodium aluminate liquid accelerator and a polycarboxylate superplasticizer. The microorganism with mineralization and sedimentation characteristics is taken as the crack repair agent of the sprayed concrete, and expanded perlite or flyash pottery sand with high porosity is taken as a carrier of the repair agent; the carrier is coated with the nutrients and is isolated from a cement-based material by an isolating layer. The concrete cracks are repaired by calcium carbonate precipitate produced by the microorganism repair agent in a metabolism process, and the crack self-repairing capacity of the sprayed concrete in the service is improved, so thatimpervious performance and durability of the sprayed concrete are improved. The sprayed concrete with crack self-repairing capacity as a sprayed concrete material with crack self-diagnosis and self-repairing functions has great research value and application potential.

Description

technical field [0001] The invention relates to the field of concrete materials, in particular to microbial crack self-repairing shotcrete and a preparation method thereof. Background technique [0002] Shotcrete is made by spraying machinery, using compressed air or other power, transporting the mixture in a certain proportion through pipelines and spraying it on the surface to be sprayed (rock wall, formwork, old building) at high speed to solidify and harden of a concrete. The essential difference between sprayed concrete and ordinary concrete is that its construction method is special. It uses a concrete sprayer to spray directly to the construction site. It does not need to support the formwork and only relies on adding accelerators to the concrete to harden the concrete in a short time. The rock or structure being blasted is strengthened and protected. It is precisely because of the advantages of simple construction, unlimited construction site, flexible maneuverabil...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B111/20C04B111/34
CPCC04B28/02C04B2111/00017C04B2111/00155C04B2111/20C04B2111/343C04B14/02C04B14/06C04B18/146C04B16/0633C04B22/08C04B2103/302C04B2103/0001C04B14/185C04B18/027C04B18/08C04B24/06C04B14/106
Inventor 李珠张家广赵林张玉
Owner 李珠
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