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Method for reinforcing recycled aggregates through biological carbonization

A recycled aggregate and biological technology, applied in the field of recycled aggregate reinforcement, can solve the problems of restricting the reuse of recycled aggregate, high crushing index, and high porosity, and achieves the improvement of hydration reaction rate, quality and water absorption. Effect

Inactive Publication Date: 2019-12-27
THE THIRD ENG CO LTD OF CCCC SECOND HIGHWAY ENG BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with natural aggregates, the performance of recycled aggregates is quite different, such as: high porosity, high water absorption, high crushing index, etc., which limits the reuse of recycled aggregates in engineering structures to a certain extent

Method used

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  • Method for reinforcing recycled aggregates through biological carbonization
  • Method for reinforcing recycled aggregates through biological carbonization
  • Method for reinforcing recycled aggregates through biological carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A kind of method of biological carbonization strengthening recycled aggregate, the steps are as follows:

[0028] (1) collect recycled aggregate, prepare calcium hydroxide solution, concentration is 0.02mol;

[0029] (2) Obtain the Bacillus colloidus bacterium liquid: Inoculate the Bacillus colloidus into the culture medium solution after sterilization, every liter of medium contains sucrose 9g, Na 2 HPO 4 12H 2 O2g, MgSO 4 0.5g, CaCO 3 1.0g, KCl0.1g, (NH 4 ) 2 SO 4 0.4g, 0.4g of yeast extract powder, and control the pH to 7, shake culture at 30°C for 24 hours to obtain the bacterial liquid containing Bacillus colioids;

[0030] (3) Carry out carbonization strengthening treatment: spray calcium hydroxide solution and colloidal bacillus bacteria solution on the surface of the recycled aggregate successively until the surface of the aggregate is wet, once every 6 hours, repeat 3 times, put the aggregate after spraying In a closed container or curing ...

Embodiment 2

[0032] Embodiment 2: A kind of method of biological carbonization strengthening recycled aggregate, the steps are as follows:

[0033] (1) collect recycled aggregate, prepare calcium chloride solution, concentration is 1.00mol;

[0034] (2) Obtain the Bacillus colloidus bacterium liquid: inoculate the Bacillus colloidus into the culture medium solution after sterilization, every liter of medium contains sucrose 12g, Na 2 HPO 4 12H 2 O3g, MgSO 4 0.6g, CaCO 3 1.5g, KCl0.2g, (NH 4 ) 2 SO 4 0.4g, 0.4g of yeast extract powder, and control the pH to 9, shake culture at 37°C for 24h to obtain the bacterial liquid containing Bacillus colioids;

[0035] (3) Carry out carbonization strengthening treatment: spray calcium hydroxide solution and colloidal bacillus bacteria solution on the surface of the recycled aggregate successively until the surface of the aggregate is wet, once every 6 hours, repeat 5 times, put the aggregate after spraying In a closed container or curing room,...

Embodiment 3

[0037] Embodiment 3: A kind of method of biological carbonization strengthening recycled aggregate, the steps are as follows:

[0038] (1) collect recycled aggregate, prepare calcium acetate solution, concentration is 0.50mol;

[0039] (2) Obtain the Bacillus colloidus bacterium liquid: inoculate the Bacillus colloidus into the culture medium solution after sterilization, every liter of medium contains sucrose 8g, Na 2 HPO 4 12H 2 O2g, MgSO 4 0.4g, CaCO 3 0.5g, KCl0.1g, (NH 4 ) 2SO 4 0.4g, 0.2g of yeast extract powder, and control the pH to 8, shake culture at 37°C for 24h to obtain the bacterial liquid containing Bacillus colioids;

[0040] (3) Carry out carbonization strengthening treatment: spray calcium hydroxide solution and colloidal bacillus bacteria solution on the surface of the recycled aggregate successively until the surface of the aggregate is wet, once every 6 hours, repeat twice, and put the aggregate after spraying In a closed container or curing room, ...

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Abstract

The invention provides a method for strengthening recycled aggregates through biological carbonization. The method comprises: a step of collecting recycled aggregates and preparing a calcium salt solution; a step of obtaining a Bacillus mucilaginosus bacterial solution; a step of carrying out carbonization strengthening treatment, namely a step of spraying the calcium salt solution and the bacillus mucilaginosus bacterial solution to the surface of the recycled aggregates until the surface of the recycled aggregates is wet, repeating the spraying operation every 6 hours, with total 2-5 times of the spraying operation being performed, putting the sprayed recycled aggregates in a closed container or a curing chamber, performing vacuumizing, then feeding carbon dioxide, controlling the pressure to 0.1-0.6 MPa, and keeping the pressure for 2-6 h to obtain biologically-strengthened recycled aggregate particles; a step of testing the water absorption rate of the recycled aggregates, samplingthe aggregate particles, observing a tissue diagram under a scanning electron microscope. According to the method, the recycled aggregates are strengthened through the enzymatic and mineralization effects of microorganisms, the quality of the recycled aggregates is improved, the application way of the recycled aggregates is expanded, aggregate demand tension in engineering construction can be relieved, construction waste resources can be recycled, and efforts are made for solving the problem of 'cities are besieged with construction waste'.

Description

technical field [0001] The invention belongs to the technical field of recycled aggregate strengthening, and in particular relates to a method for strengthening recycled aggregate through biological carbonization. Background technique [0002] With the acceleration of my country's urbanization process, the disposal of construction waste has become a difficult problem that must be overcome for the sustainable development of my country's construction industry. The composition of construction waste is very complex, but the waste concrete contained in it contains a certain amount of natural sand and gravel aggregates, which are crushed and screened by specific technical means to obtain recycled aggregates. Compared with natural aggregates, the performance of recycled aggregates is quite different, such as: high porosity, high water absorption, high crushing index, etc., which limits the reuse of recycled aggregates in engineering structures to a certain extent. Contents of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B18/16
CPCC04B18/16C04B20/023Y02W30/91
Inventor 胡敏高海云刘辉高飞马孟田串串程子坤王瑞兴丁泽晨
Owner THE THIRD ENG CO LTD OF CCCC SECOND HIGHWAY ENG BUREAU
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