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Recycled aggregate strengthening method utilizing biological deposition

A technology of recycled aggregate and biological deposition, applied in the field of building materials, can solve the problems of calcium carbonate unable to repair holes in a targeted manner, difficult to large-scale industrial application, complicated spray treatment equipment, etc., to change the pore structure and basic performance. , Reduce the cost of the process, and improve the effect of the repair effect

Active Publication Date: 2022-06-07
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of strengthening recycled aggregates using biodeposition to solve / improve the problem that the calcium carbonate generated by biomineralization deposition during traditional immersion treatment cannot be targeted to repair holes, and the spray treatment equipment is complex and costly. High, at least one problem in the status quo that is difficult for large-scale industrial application

Method used

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  • Recycled aggregate strengthening method utilizing biological deposition
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  • Recycled aggregate strengthening method utilizing biological deposition

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The regeneration aggregate strengthening method utilizing biological deposition of the present embodiment comprises the following steps:

[0059] (1) Filling and soaking: Select the particle size of the regenerated aggregate to be 9.5-16 mm, add the bacterial liquid to the regenerated aggregate according to the ratio of the mass ratio of the bacterial liquid and the regenerated aggregate to 1:2, and place it at 30, and the vacuum degree is 0.8 Soak in Mpa vacuum drying box for 30min, take out the regenerated aggregate from the bacterial liquid and then soak it in the mineralized culture medium with a mass ratio of 1:1 to the bacterial liquid. Then take it out, wash it, and dry it in an oven at 40°C;

[0060] (2) Repair and soaking: prepare the mixed culture solution according to the ratio of the mass ratio of the mineralized culture solution and the bacterial solution to 1:1, and then according to the ratio of the mass ratio of the mixed culture solution and the regener...

Embodiment 2

[0065] The regeneration aggregate strengthening method utilizing biological deposition of the present embodiment comprises the following steps:

[0066] (1) Filling and soaking: select the particle size of the regenerated aggregate to be 9.5-16 mm, add the bacterial liquid to the regenerated aggregate according to the ratio of the mass ratio of the bacterial liquid to the regenerated aggregate to be 1.2:2, and place it at 30, with a vacuum degree of 0.8 Soak in a vacuum drying box of Mpa for 30min; take out the regenerated aggregate from the bacterial solution and then soak it in a mineralized culture solution with a mass ratio of 1:1 to the bacterial solution, and place it in a ventilated environment at 25-35 °C for curing, 14d Then take it out, wash it, and dry it in an oven at 40°C;

[0067] (2) Repair and soaking: prepare the mixed culture solution according to the ratio of the mass ratio of the mineralized culture solution and the bacterial solution to 1:1, and then accor...

Embodiment 3

[0072] The regeneration aggregate strengthening method utilizing biological deposition of the present embodiment comprises the following steps:

[0073] (1) Filling and soaking: Select the particle size of the regenerated aggregate to be 4.75-9.5 mm, add the bacterial liquid to the regenerated aggregate according to the ratio of the mass ratio of the bacterial liquid to the regenerated aggregate to be 1:2, and place it at 30°C with a vacuum degree of 1:2. Soak in a 0.8Mpa vacuum drying box for 30min, take out the regenerated aggregate from the bacterial solution, then soak it in a mineralized culture solution with a mass ratio of 1:1 to the bacterial solution, and place it in a ventilated environment at 25-35 °C for curing. After 14 days, take it out, wash it, and dry it in an oven at 40°C;

[0074] (2) Repair and soaking: prepare the mixed culture solution according to the ratio of the mass ratio of the mineralized culture solution and the bacterial solution to 1:1, and then ...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a method for reinforcing recycled aggregate by utilizing biological deposition, which comprises the following steps: (1) filling and soaking: soaking the recycled aggregate in a bacteria solution in a vacuum environment, then taking out the recycled aggregate from the bacteria solution, soaking in a mineralization culture solution, and then, taking out the recycled aggregate from the bacteria solution; after soaking, the recycled aggregate is taken out, cleaned and dried; (2) repairing and soaking: taking out the recycled aggregate treated in the step (1), cleaning, drying, and soaking in a mixed culture solution of the bacterial solution and the mineralized culture solution; the bacterial liquid contains bacillus. The method for reinforcing the recycled aggregate by utilizing the biological deposition can act on the area, needing to be repaired, of the recycled aggregate in a more targeted manner, a better repairing effect is achieved, the process cost is greatly reduced by adopting the industrially-produced bacterial powder, and the MICP technology is more widely applied.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for strengthening recycled aggregates by utilizing biological deposition. Background technique [0002] As far as the sustainable development of the construction industry is concerned, it is of great significance to recycle building materials from construction waste to alleviate the shortage of natural building materials and the shortage of land resources for landfilling construction waste. However, the performance of recycled aggregate itself is much worse than that of natural aggregate, and the use of recycled aggregate in recycled concrete will lead to degradation of the mechanical properties and durability of recycled concrete. When recycled aggregate is used to replace all natural aggregate in recycled concrete , the splitting tensile strength, elastic modulus and compressive strength of recycled concrete will be greatly reduced. [0003] The...

Claims

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Application Information

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IPC IPC(8): C04B20/02
CPCC04B20/02C04B18/16Y02W30/91
Inventor 冯春花崔卜文朱建平黄益宏赵彦华陈钰宗旭东
Owner HENAN POLYTECHNIC UNIV