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A microbial self-healing concrete crack repair observation method

A microbial and self-repairing technology, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators, can solve the problems of not being able to display the actual repair of microbial self-repairing concrete cracks, and achieve Improve the effect of color distinction

Active Publication Date: 2022-03-08
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem that existing concrete crack observation methods cannot display the actual repair status of microbial self-repairing concrete cracks, the present invention provides a method for observing the repair status of microbial self-repairing concrete cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Sample: The size of the concrete specimen is 100mm×100mm×100mm, the water-cement ratio is 0.50, and the sand rate is 36%. Carbonic anhydrase is added in the form of bacterial powder to replace the sand, and the replacement rate is 5%, and the standard condition is maintained for 28 days.

[0031] Equipment and test conditions: Take out the microbial self-repairing concrete test block that has been cured for 28 days under standard curing conditions, and load it continuously and evenly at a speed of 0.02MPa / s with a universal testing machine. When the upper platen is close to the test piece, adjust the ball The seat balances the contact, and stops loading when microscopic cracks appear in the microbial self-healing concrete. Put the microbial self-healing concrete test block with fine cracks prepared into the standard curing room for 28 days of curing. Take the test piece out of the standard curing room, add a concentration of 2.5g / 100ml (0.01mol / L) copper sulfate pentahy...

Embodiment 2

[0034] The size of the sample concrete specimen is 100mm×100mm×100mm, the water-cement ratio is 0.50, and the sand rate is 36%. Carbonic anhydrase is added in the form of bacterial powder to replace the sand, and the replacement rate is 5%, and the standard condition is maintained for 28 days.

[0035]Equipment and test conditions: Take out the microbial self-repairing concrete test block that has been cured for 28 days under standard curing conditions, and load it continuously and evenly at a speed of 0.02MPa / s with a universal testing machine. When the upper platen is close to the test piece, adjust the ball The seat balances the contact, and stops loading when microscopic cracks appear in the microbial self-healing concrete. Put the microbial self-healing concrete test block with fine cracks prepared into the standard curing room for 28 days of curing. Take the test piece out of the standard curing room, add a concentration of 3g / 100ml (0.012mol / L) copper sulfate pentahydra...

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Abstract

The invention discloses a method for observing the repairing condition of microbial self-repairing concrete cracks, which comprises the following steps: preparing a microbial self-repairing concrete specimen containing cracks; adding copper sulfate pentahydrate solution to the cracks of the specimen, and then keeping the specimen Let it stand for more than two days, and dry it in vacuum; split the dried microbial self-repairing concrete specimen from the crack, and the blue-green material at the crack split is the position where the microorganism produces calcium carbonate through mineralization and deposition. This method can significantly improve the color distinction between microbial deposition of calcium carbonate and concrete matrix, clearly and accurately display the distribution of calcium carbonate produced by microbial mineralization deposition in the crack area of ​​microbial self-healing concrete, so that the microbiological self-healing concrete cracks can be directly observed by naked eyes The location of calcium carbonate deposition clearly shows the effect of microbial mineralization deposition on repairing cracks.

Description

technical field [0001] The invention relates to a method for characterization and display of concrete cracks, in particular to a method for observing the repairing condition of microbial self-repairing concrete cracks, and belongs to the technical field of building materials. Background technique [0002] In modern society, concrete has become the most important building material in the field of civil engineering, and is used in many fields such as construction, transportation, bridges, water conservancy, and underground engineering. With the rapid development of my country's economy, the scale of national infrastructure construction has gradually expanded, and the amount of concrete has been increasing year after year. Concrete itself has the characteristics of high brittleness and low tensile strength. At the same time, multiple reasons such as load-bearing overload and internal expansion in concrete applications lead to cracks in concrete components, which reduces the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/82G01N21/78
CPCG01N21/82G01N21/78
Inventor 钱春香陈沁文李敏张耀明
Owner SOUTHEAST UNIV
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