Application of alcaligenes as reinforcing agent to mineralized reinforced calcareous sand technology

The technology of Alcaligenes bacteria and reinforcement agent is applied in the field of application of Alcaligenes bacteria as reinforcement agent in the process of mineralization and reinforcement of calcareous sand, which can solve the problems such as pH increase and negative environmental impact, and achieves low environmental impact, Guaranteed drainage and infiltration, widening the application range

Inactive Publication Date: 2019-10-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a considerable part of the ammonia gas is directly discharged into the air due to the increase of the pH value of the solution as the reaction progresses and cannot be dissolved, which has a negative impact on the environment.

Method used

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  • Application of alcaligenes as reinforcing agent to mineralized reinforced calcareous sand technology
  • Application of alcaligenes as reinforcing agent to mineralized reinforced calcareous sand technology
  • Application of alcaligenes as reinforcing agent to mineralized reinforced calcareous sand technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Add citrate with a volume molar concentration of 0.8mol / l to the strain concentration OD 600 In the Alcaligenes solution of =1.5, a mixed liquid is formed, wherein, in the mixed solution, the volume ratio of Alcaligenes and citrate is 1:1;

[0039] 2) Inject 100mL of the above mixed solution into a Ф5cm×10cm calcareous sand column with a peristaltic pump, and let it stand for 2 hours;

[0040] 3) Use a peristaltic pump to inject 100 mL of CaCl with a volume molar concentration of 0.8 mol / l into the above-mentioned calcareous sand column 2 solution, let it stand for 6 hours, and discharge the remaining solution in the calcareous sand column;

[0041] 4) Repeat steps 2)-3) until the mixed liquid can no longer be injected into the above-mentioned calcareous sand column;

[0042] 5) The above-mentioned reinforced calcareous sand column can be dried, maintained and demoulded. The reinforcement effect of the resulting reinforced calcareous sand column

[0043] The sche...

Embodiment 2

[0045] Step 1) The volume ratio of Alcaligenes and citrate in the mixed solution is 0.5:1, and the others are the same as in Example 1. The reinforcement effect of the obtained reinforced calcareous sand column is shown in Table 1.

Embodiment 3

[0047] Step 1) The volume ratio of Alcaligenes and citrate in the mixed solution is 1.5:1, and the others are the same as in Example 1. The reinforcement effect of the obtained reinforced calcareous sand column is shown in Table 1.

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Abstract

The invention discloses application of alcaligenes as a reinforcing agent to a mineralized reinforced calcareous sand technology. Studies unexpectedly find that when the alcaligenes is added as the reinforcing agent in a grouting technology of mineralized reinforced calcareous sand, on one hand, compared with the existing urease-based microbial cement producing ammonia gas in the process of hydrolyzing urea, citrate can be hydrolyzed into carbonas in which the carbonate is combined with calcium ions to produce calcium carbonate, and no ammonia gas is produced during mineralization consolidation, so that influence on the environment is less and environment friendliness is higher; and on the other hand, compared with ordinary Portland cement, a larger permeability coefficient is achieved, drainage and seepage of the ground can be better guaranteed while a slope and a foundation are reinforced, so that the application range of the alcaligenes in the market is greatly widened.

Description

technical field [0001] The present invention relates to a new use of Alcaligenes, in particular to the use of Alcaligenes as a reinforcing agent in the process of mineralizing and strengthening calcareous sand Background technique [0002] Portland cement is the most commonly used gel material in construction engineering, and it occupies an important position in the historical process and future development of mankind. However, the production process of Portland cement requires a large amount of heat to convert quicklime into slaked lime. At the current level of productivity, this part of the heat is generated by the combustion of fossil fuels. As a result, the production process of Portland cement needs to consume a large amount of fossil fuels, and a large amount of carbon dioxide (CO2) will be emitted in the process of burning fossil fuels and burning quicklime. 2 ), atmospheric CO 2 The increase in concentration will cause the "greenhouse effect". In addition, various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/06C04B20/02
CPCC04B20/02C04B40/0039C04B24/06C04B2103/0001C04B14/06
Inventor 马建军黄林冲梁禹
Owner SUN YAT SEN UNIV
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