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Concrete crack self-healing agent and preparation method thereof

A concrete and mixture technology, applied in the field of concrete crack self-healing agent and its preparation, can solve the problem that microbial mineralization is difficult to achieve the ideal repair effect, and achieve the effect of promoting the formation of crystals and accelerating the hydration process

Inactive Publication Date: 2021-08-17
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above-mentioned related technologies are not suitable for repairing concrete cracks with large width and deep depth, and when secondary cracks occur at the self-repairing cracks, microbial mineralization is more difficult to achieve the ideal repairing effect

Method used

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  • Concrete crack self-healing agent and preparation method thereof
  • Concrete crack self-healing agent and preparation method thereof
  • Concrete crack self-healing agent and preparation method thereof

Examples

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preparation example Construction

[0034] The preparation method of the crack self-healing agent of concrete described in above-mentioned embodiment 1 comprises the steps:

[0035] Step 1: Inoculate and cultivate Bacillus coformis according to the conventional method to obtain the bacterial liquid, and centrifuge the obtained bacterial liquid at 4000r / min for 20 minutes to obtain the bacterial sludge with a concentration of 6×10 9 cell / ml;

[0036] Step 2: Add 20ml of bacteria slime and 3g of calcium lactate described in step 1 into the silica sol and stir well;

[0037] Step 3: Add 8g of calcium formate and 0.5g of sodium methyl silicate to 120ml of water, stir well until all solid substances are dissolved;

[0038] Step 4: Add Portland cement and ISO standard sand into the mixing pot, and stir slowly for 2 minutes;

[0039] Step 5: Add the solution described in step 3 into the stirring pot and stir slowly for 1 minute;

[0040]Step 6: Add the silica sol described in step 2 into the stirring pot and stir qu...

Embodiment 2

[0048] Embodiment 2: The only difference from Example 1 is that in the self-healing agent, 30 grams of Bacillus korsi sludge, 25 grams of silica sol, 10 grams of calcium formate, 5 grams of calcium lactate, and 1.5 grams of sodium methyl silicate .

[0049] On the basis of Example 2, a comparative example is provided below.

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Abstract

The invention provides a concrete crack self-healing agent and a preparation method thereof , and the crack self-healing agent is prepared from the following components in parts by weight: 100 to 200 parts of cement, 250 to 350 parts of sand, 100 to 150 parts of water, 20 to 30 parts of basophilic bacillus, 15 to 25 parts of a sol active agent, 8 to 10 parts of water-soluble calcium salt, 3 to 5 parts of a nutrient substance, 0.5 to 1.5 parts of a water repellent and 1 to 2 parts of a complexing agent. The self-healing agent for the concrete cracks can enable a cementing material, microorganisms and a self-repairing material assisting in mineralization of the microorganisms to penetrate into the deep parts of the concrete cracks, can effectively seal the existing cracks, can self-heal new cracks in the process that the microorganisms generate calcium carbonate when secondary cracking occurs, the method has remarkable engineering significance in improving the repairing efficiency of concrete cracks and improving the durability of a repaired structure.

Description

technical field [0001] The invention relates to the technical field of concrete crack self-healing, in particular to a concrete crack self-healing agent and a preparation method thereof. Background technique [0002] Concrete is the most used building material in the field of civil engineering. In 2019, the output of commercial concrete in my country alone has reached nearly 3 billion cubic meters. Concrete will inevitably produce cracks under the influence of factors such as its own shrinkage, heat of hydration, external temperature and load. The appearance of cracks makes it easier for external harmful substances such as chloride ions and sulfate ions to enter the interior of the concrete, causing damage and corrosion of the concrete and internal steel bars. However, it is difficult to repair concrete cracks to achieve long-term durability. A large number of engineering practices have shown that there is a high probability that secondary cracks will still occur after repa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/343C04B2201/50C04B14/06C04B14/062C04B24/04C04B24/06C04B24/42C04B24/123C04B2103/0001
Inventor 元强钟福文左胜浩余志武
Owner CENT SOUTH UNIV
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