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Preparation method of concrete repairing mortar

A technology for repairing mortar and concrete, which is applied in the field of building materials, can solve the problems of reduced concrete bearing capacity and durability, small shrinkage, and difficulty in maintaining stable repair effects, so as to improve the compressive strength, avoid gradual reduction, and repair effects good effect

Active Publication Date: 2019-06-07
成都顺佳美恒新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Concrete is a common building material with good compressive properties and low cost. However, during the use of concrete, due to its weak elongation, its structure is prone to cracking and water seepage, which will not only affect the bearing capacity and durability of concrete. reduction, and may cause safety accidents. At present, concrete crack repair materials are mainly divided into two categories: inorganic and organic. Most of the inorganic repair materials are composed of rapid hardening cement, which has small shrinkage, low early strength, and low viscosity. Low junction strength; organic repair materials are mainly composed of organic polymers, such as epoxy silica gel, but their prices are high, pollute the environment and have poor compatibility with concrete interfaces
[0003] It has been reported that microbially induced carbonate deposition (MICP) technology is used in concrete repair, which induces the formation of calcium carbonate precipitation through the mineralization of microorganisms in the metabolic process, thereby increasing the compressive strength and impermeability of concrete, but The calcium carbonate formed by this technology is extremely uneven, and the calcium carbonate produced is generally concentrated in the crack, and it is difficult to penetrate deep into the crack. Therefore, only the surface layer of the crack can be repaired, and the repair result is affected by the crack width, crack age, etc. difficult to maintain stability

Method used

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  • Preparation method of concrete repairing mortar
  • Preparation method of concrete repairing mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare concrete repair mortar as follows.

[0046](1) Add 200 ml of 5 mol / L citric acid to 100 g of corn stalk powder (particle size 60 μm), acidify for 2 hours, wash with distilled water until neutral, and dry to obtain acidified straw powder;

[0047] (2) Mix the strain cells, 15% urea solution, 50% calcium acetate solution and 2% sodium alginate solution in a weight ratio of 1:5:6:5, stir at 30°C for 20 minutes, let stand for 32 hours, and mix according to the weight ratio Solution: acidified straw=10:2, add the acidified straw powder obtained in step (1), mix evenly, let it stand for 2 hours, and obtain the repairing liquid, wherein, the strain cells are purified carbonic anhydrase strains in a sterile medium After culturing at 30°C for 48 hours, it was obtained by repeated centrifugation and washing at 2°C. The sterile medium was composed of: peptone 15g / L, yeast powder 20g / L, ammonium sulfate 10g / L, pH 7;

[0048] (3) Mix the repair liquid obtained in step (2) w...

Embodiment 2

[0050] Prepare concrete repair mortar as follows.

[0051] (1) Add 300 ml of 5 mol / L citric acid to 100 g of corn stalk powder (particle size 100 μm), acidify for 1.5 h, wash with distilled water until neutral, and dry to obtain acidified straw powder;

[0052] (2) Mix the strain cells, 15% urea solution, 50% calcium acetate solution and 2% sodium alginate solution in a weight ratio of 1:3:8:6, stir at 30°C for 20 minutes, let stand for 48 hours, and mix according to the weight ratio Solution: acidified straw=10:4, add the acidified straw powder obtained in step (1), mix evenly, and let it stand for 3 hours to obtain a repairing solution, wherein the strain cells are purified carbonic anhydrase strains in a sterile medium After culturing at 30°C for 24 hours, it was obtained by repeated centrifugation and washing at 2°C. The sterile medium consists of: meat extract broth 30g / L, peptone 12g / L, polysaccharide 8g / L, agar 10g / L, pH is 6.5;

[0053] (3) Mix the repair liquid obta...

Embodiment 3

[0055] Prepare concrete repair mortar as follows.

[0056] (1) Add 200 ml of 5 mol / L citric acid to 100 g of corn stalk powder (particle size 120 μm), acidify for 1.5 h, wash with distilled water until neutral, and dry to obtain acidified straw powder;

[0057] (2) Mix the strain cells, 15% urea solution, 50% calcium acetate solution and 2% sodium alginate solution in a weight ratio of 1:4:8:5, stir at 30°C for 20 minutes, let stand for 48 hours, and mix according to the weight ratio Solution: acidified straw=10:3.5 add the acidified straw powder obtained in step (1), after mixing evenly, let it stand for 3 hours to obtain repairing solution, wherein, the strain cells are purified carbonic anhydrase strains in a sterile medium After culturing at 30°C for 48 hours, it was obtained by repeated centrifugation and water washing at 2°C. The sterile medium consists of: meat extract broth 30g / L, peptone 12g / L, polysaccharide 8g / L, agar 10g / L, pH is 6.5;

[0058] (3) Mix the repair ...

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Abstract

The invention discloses a preparation method of concrete repairing mortar. The preparation method comprises the following steps: (1) adding citric acid into corn stalk powder, performing acidification, performing washing by using distilled water to neutrality, and performing drying to obtain acidified stalk powder; (2) mixing strain cells, a urea solution, a calcium acetate solution and a sodium alginate solution according to a certain weight ratio, performing stirring, allowing the stirred material to stand, adding the product into the acidified stalk powder obtained in the step (1), performing uniform mixing, and allowing the mixed material to stand to obtain a repairing liquid; and (3) mixing the repairing liquid obtained in the step (2), autoclaved quartz sand (particle size of 0.5-1.0mm) and water to form the mortar. According to the preparation method provided by the invention, the repairing mortar prepared by the method can be applied to internal structural repair of concrete,has strong bonding performance, is not easy to fall off, and has a stable repair effect, and wide applicability.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing concrete repair mortar. Background technique [0002] Concrete is a common building material with good compressive properties and low cost. However, during the use of concrete, due to its weak elongation, its structure is prone to cracking and water seepage, which will not only affect the bearing capacity and durability of concrete. reduction, and may cause safety accidents. At present, concrete crack repair materials are mainly divided into two categories: inorganic and organic. Most of the inorganic repair materials are composed of rapid hardening cement, which has small shrinkage, low early strength, and low viscosity. The junction strength is low; the main component of organic repair materials is organic polymers, such as epoxy silica gel, but its price is high, pollutes the environment and has poor compatibility with the concrete interface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C12N11/12C12N11/10C12N11/04C12R1/07C04B111/72
Inventor 郭绪平郭芋伶
Owner 成都顺佳美恒新材料有限公司
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