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Method for modifying recycled aggregate based on aerobic basophilic mixed bacterium mineralization deposition

A recycled aggregate and alkaliphilic technology, which is applied in the field of building materials, can solve the problems of increasing the damage of recycled aggregate, increasing the alkali-silicon reaction, and the compatibility between polymer and concrete to be discussed, so as to improve the physical and mechanical properties and improve the surface Effects of compactness, porosity reduction and water absorption

Active Publication Date: 2017-10-03
山西耀辉实业发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are mainly two methods for the modification of recycled aggregates: one is to remove the mortar layer by mechanical grinding, thermal grinding, pickling, etc. Damage to recycled aggregates; another kind of mortar that strengthens the bonding of recycled aggregates, for example, by using sodium silicate to treat recycled aggregates, but this treatment method will greatly increase the probability of alkali-silicon reactions. In addition, It is also possible to form a waterproof coating on the surface of recycled aggregates by impregnating recycled aggregates in polymers, but the compatibility of polymers with concrete is questionable

Method used

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  • Method for modifying recycled aggregate based on aerobic basophilic mixed bacterium mineralization deposition

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Experimental program
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Effect test

Embodiment 1

[0036] A method for modifying recycled aggregates based on the mineralization deposition of aerobic alkaliphilic mixed bacteria requires the following raw materials in parts by weight: 3 parts of recycled aggregates with a particle size of 5-20 mm, and 0.6 parts of aerobic alkaliphilic mixed bacteria solution , 0.48 parts of calcium lactate, 0.48 parts of yeast powder, and 24 parts of water. (1kg per serving)

[0037] Ⅰ. Screening of aerobic and alkalophilic mixed bacteria:

[0038] a. Select activated sludge from sewage treatment plants and garden mud as separate inoculation sources;

[0039] b. Prepare trace element solution (diluted 100 times when used), the content of each component per liter is: vitamin H 0.2g, folic acid (vitamin B9) 0.2g, vitamin B6 1g, vitamin B2 0.5g, vitamin B1 0.5g, tobacco Acid (vitamin B3) 0.5g, vitamin B5 0.5g, vitamin B12 0.01g, p-aminobenzoic acid 0.5g, lipoic acid 0.5g.

[0040] c. Prepare an aerobic basophilic selective culture solution. T...

Embodiment 2

[0060] A method for modifying recycled aggregates based on the mineralization deposition of aerobic alkaliphilic mixed bacteria requires the following raw materials in parts by weight: 4 parts of recycled aggregates with a particle size of 10-25 mm, and 0.8 parts of aerobic alkaliphilic mixed bacteria solution , 0.56 parts of calcium lactate, 0.56 parts of yeast powder, and 28 parts of water. (1kg per serving)

[0061] 1. The screening method of aerobic alkalophilic mixed bacteria is the same as that of Example 1. The bacterial liquid cultivated for the last time is diluted with distilled water to make the concentration of the bacterial liquid to 5.0×10 6 individual / mL.

[0062] Ⅱ. Modification process of recycled aggregate:

[0063] (1) Bacterial adsorption of recycled aggregate

[0064] The regeneration aggregate adsorption method is the same as Example 1.

[0065] (2) Restoration and maintenance of recycled aggregate

[0066] a. Add calcium lactate and yeast powder int...

Embodiment 3

[0071] A method for modifying recycled aggregate based on the mineralization deposition of aerobic alkaliphilic mixed bacteria requires the following raw materials in parts by weight: 5 parts of recycled aggregate with a particle size of 10-30mm, and 1.0 part of aerobic alkaliphilic mixed bacteria solution , 0.64 parts of calcium lactate, 0.64 parts of yeast powder, and 32 parts of water. (1kg per serving)

[0072] 1. The screening method of aerobic and alkalophilic mixed bacteria is the same as that of Example 1. The bacteria liquid cultivated for the last time is diluted with distilled water to make the concentration of the bacteria liquid reach 6.0×10 6 individual / mL.

[0073] Ⅱ. Modification process of recycled aggregate:

[0074] (1) Bacterial adsorption of recycled aggregate

[0075] The regeneration aggregate adsorption method is the same as Example 1.

[0076] (2) Restoration and maintenance of recycled aggregate

[0077] a. Add calcium lactate and yeast powder in...

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Abstract

The invention discloses a method for modifying recycled aggregate based on aerobic basophilic mixed bacterium mineralization deposition. The method comprises I, screening aerobic basophilic mixed bacteria and II, modifying recycled aggregate. Through a bacterial screening method, aerobic basophilic mixed bacteria having good practicability to the survival environment are screened. In the environment with enough calcium sources, oxygen and water, the mixed bacteria realize mineralization deposition of a large amount of calcium carbonate precipitates through metabolism. Through the excellent mineralization deposition capacity of the mixed bacteria, cracks and holes on the surface of recycled aggregate are repaired. In modification of the recycled aggregate, the desired mixed bacteria are screened and then are cultured, then the bacterium solution is adsorbed by the surface of recycled aggregate through a vacuum absorption method, and a calcium lactate solution is sprayed to the recycled aggregate to cure the recycled aggregate so that the surface defects of the recycled coarse aggregate are repaired. The method can effectively improve the physical and mechanical properties of the recycled coarse aggregate.

Description

technical field [0001] The invention relates to building materials, in particular to a method for modifying regenerated aggregates by using aerobic alkaliphilic mixed bacteria mineralization deposition technology. Background technique [0002] With the continuous advancement of urbanization in our country, a large number of existing concrete buildings have been demolished. The negative impact on the environment caused by waste concrete piled up randomly or simply buried is becoming more and more serious. At the same time, concrete production requires a large amount of sand and gravel aggregates, and with the continuous mining of natural sand and gravel, natural aggregate resources tend to be exhausted. Therefore, how to recycle waste concrete is an urgent problem to be solved . At present, the recycling and reuse of waste concrete is mainly to use recycled stones as coarse aggregates of recycled concrete. However, studies have shown that the recycled concrete prepared by r...

Claims

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Application Information

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IPC IPC(8): C04B18/16C12N1/00
CPCC04B18/167C12N1/00Y02W30/91
Inventor 张家广郝小虎李珠周爱娟刘元珍赵林
Owner 山西耀辉实业发展股份有限公司
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