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Marking method for microbial self-repairing of concrete cracks based on fluorescent material

A technology of fluorescent materials and marking methods, applied in the field of building materials, to achieve the effect of improving color discrimination

Inactive Publication Date: 2020-04-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, there are few methods to mark the location of microbial mineralization deposition products in the existing reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Sample: Concrete specimen size 100mm×100mm×100mm, demoulding for 24 hours, water-cement ratio 0.50, sand rate 36%, adding carbonic anhydrase in the form of bacteria powder to replace sand, replacement rate 5%, standard condition curing 28d .

[0025] Europium nitrate solution preparation: according to the chemical reaction formula Prepare 10ml of deionized water, 0.7ml of 68% nitric acid, 0.765g of Eu 2 o 3 . Dilute 0.7ml of concentrated nitric acid with 10ml of deionized water, pour it into a 25ml three-necked flask, and weigh 0.495g of Eu with a purity of 99.99%. 2 o 3 Add the white powder, stir at room temperature on a magnetic stirrer for 2h, measure the pH value of the solution, weigh 0.270g of Eu with a purity of 99.99% 2 o 3 Add the white powder, stir the solution for 2 hours in a water bath at 60°C, and measure the pH value of the solution. When the pH value of the solution is 7, the reaction is complete. Transfer the reaction solution to a 100ml volumetr...

Embodiment 2

[0029] 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.

[0030] Europium nitrate solution preparation: according to the chemical reaction formula Prepare 15ml of deionized water, 1.75ml of 68% nitric acid, 1.913g of Eu 2 o 3 . Dilute 1.75ml of concentrated nitric acid with 15ml of deionized water, pour it into a 50ml three-necked flask, and weigh 1.238g of Eu with a purity of 99.99%. 2 o 3 Add the white powder, stir at room temperature on a magnetic stirrer for 2h, measure the pH value of the solution, weigh 0.675g of Eu with a purity of 99.99% 2 o 3 Add the white powder, stir the solution for 2 hours in a water bath at 60°C, and measure the pH value of the solution. When the pH value of the solution is 7, the reaction is complete. Tr...

Embodiment 3

[0034]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.

[0035] Europium nitrate solution preparation: according to the chemical reaction formula Prepare 20ml of deionized water, 0.7ml of 68% nitric acid, 0.765g of Eu 2 o 3 . Dilute 1ml of concentrated nitric acid with 20ml of deionized water, pour it into a 50ml three-necked flask, and weigh 0.500g of Eu with a purity of 99.99%. 2 o 3 Add the white powder therein, stir at room temperature on a magnetic stirrer for 2h, measure the pH value of the solution, weigh 0.265g of Eu with a purity of 99.99% 2 o 3 Add the white powder, stir the solution for 2 hours in a water bath at 60°C, and measure the pH value of the solution. When the pH value of the solution is 7, the reaction is complete....

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Abstract

The invention discloses a marking method for microbial self-repairing of concrete cracks based on a fluorescent material. The method comprises the following steps: adding a Eu(NO3)3 solution with a certain concentration into the microbial self-repairing concrete crack, maintaining a test block at room temperature, doping eu<3+> in calcium carbonate generated by microbial mineralization and deposition in a crack area, and generating the CaCO3: Eu < 3 + > fluorescent substance which emits bright red fluorescence after being irradiated by an ultraviolet lamp in the wavelength of 365 nm. The actual position of self-repairing product calcium carbonate in the microbial self-repairing concrete test block crack can be clearly represented.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a fluorescent material-based microbial self-repairing concrete crack marking method. Background technique [0002] In recent years, with the rapid development of my country's infrastructure construction, the consumption of concrete materials has been increasing year by year. The concrete material itself has high brittleness, low tensile strength and the influence of external construction, maintenance and other factors, which are prone to cracks. There are cracks in the concrete specimens, which may affect the normal use of buildings containing concrete parts, or threaten the safety of human life and property in the buildings. In order to be able to repair the cracks produced by concrete, more and more new technologies and new materials are emerging, and microbial self-healing concrete technology is the research focus of many technicians. [0003] Using the mineraliza...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 李敏陈沁文钱春香
Owner SOUTHEAST UNIV
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