Method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete

A technology of recycled aggregate and denitrification, applied in the field of construction waste recycling, can solve the problems of high crushing value, high water absorption, low apparent density of recycled aggregate, etc., and achieve the effect of low cost

Active Publication Date: 2021-05-28
XIAN JIAOTONG LIVERPOOL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method utilizes the phenomenon of microbial denitrification to strengthen recycled aggregates, which well solves the shortcomings of recycled aggregates such as low apparent density, high water absorption rate, and high crushing value, and the defects of recycled aggregate concrete in low mechanical properties.

Method used

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  • Method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete
  • Method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete
  • Method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete

Examples

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Effect test

preparation example 1

[0070] This preparation example provides a bacterial liquid of denitrifying bacteria, which is prepared by the following preparation method:

[0071] (a) Inoculate the denitrifying bacteria on the culture medium and culture on a shaker at 30°C for 18 hours. When the OD value reaches 1, the bacterial concentration can reach 10 9 CFU / mL;

[0072] Described culture medium is: the American BD234000 culture medium of 5g / L, the sodium chloride of 5g / L and distilled water prepare bacterial liquid culture medium, and culture medium is carried out high temperature and high pressure steam sterilization;

[0073] (b) Centrifuge to obtain bacteria, add distilled water to prepare 10 7 cfu / mL bacterial solution.

preparation example 2

[0075] This preparation example provides a kind of bacterium liquid of denitrifying bacteria, and the difference of preparation example 1 is only, step (b) adds distilled water and is mixed with 10 5 cfu / mL bacterial solution.

preparation example 3

[0077] This preparation example provides a kind of bacterium liquid of denitrifying bacteria, and the difference of preparation example 1 is only, step (b) adds distilled water and is mixed with 10 8 cfu / mL bacterial solution.

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Abstract

The invention provides a method for strengthening recycled aggregate concrete by utilizing a microbial denitrification phenomenon and the recycled aggregate concrete. The method for strengthening the recycled aggregate concrete by utilizing the microbial denitrification phenomenon comprises the following steps: (1) soaking recycled aggregate in a bacteria solution of denitrifying bacteria to obtain the recycled aggregate attached with the denitrifying bacteria; (2) soaking the recycled aggregate attached with the denitrifying bacteria obtained in the step (1) in a calcium salt solution and / or spraying the calcium salt solution on the surface of the recycled aggregate attached with the denitrifying bacteria obtained in the step (1); and (3) concrete mixing: mixing the recycled aggregate treated in the step (2) instead of natural aggregate to obtain the recycled aggregate concrete. The method disclosed by the invention well overcomes the defects of low apparent density, high water absorption rate, high crushing value and the like of the recycled aggregate and the defect of low mechanical property of the recycled aggregate concrete.

Description

technical field [0001] The invention belongs to the technical field of construction waste recycling, and relates to a method for strengthening recycled aggregate concrete by utilizing the microbial denitrification phenomenon and the recycled aggregate concrete. Background technique [0002] Construction waste can be reprocessed into recycled aggregate to replace natural aggregate in fresh concrete. On the one hand, recycled aggregates significantly increase the sustainability of concrete production. On the other hand, due to the shortcomings of recycled aggregates such as low apparent density, high water absorption, and high crushing value, recycled aggregate concrete has defects in low mechanical properties, large shrinkage, and poor durability. Bacterial mineralization technology has been used to strengthen recycled aggregates and concrete. [0003] At present, the commonly used bacteria are mainly bacteria containing urease such as Bacillus. This kind of bacteria encou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B18/16C04B28/00
CPCC04B20/023C04B18/16C04B28/00C04B2201/50C04B14/06C04B2103/0001C04B24/04C04B22/085C04B24/10Y02W30/91
Inventor 刘作为程志翔夏骏
Owner XIAN JIAOTONG LIVERPOOL UNIV
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