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Microbial microcapsule anti-sulfate erosion system of structural concrete

A sulfate-resistant and microcapsule technology, applied in the field of concrete engineering, can solve the problems that sulfate-resistant cement cannot meet actual engineering needs, cannot effectively control sulfate corrosion for a long time, and cannot prevent sulfate diffusion, etc. The anti-sulfate corrosion ability is effective for a long time, avoiding the outage of rail transit lines, and improving the safety and durability.

Active Publication Date: 2014-08-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 1) Although some problems can be solved by improving the design grade of concrete and improving the protection ability of concrete and its steel bars, practice has proved that it is still unable to effectively control sulfate corrosion for a long time
Moreover, the corrosion resistance index of sulfate-resistant cement stipulates that SO 4 2- The concentration of SO is 2500mg / L, but in fact SO 4 2- The concentration often exceeds this index, and ordinary sulfate-resistant cement cannot meet the actual engineering needs.
[0014] 2) The construction is difficult when using anti-corrosion coating, and the coating is easy to fall off
[0015] 3) The further diffusion of sulfate cannot be prevented in the later stage

Method used

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  • Microbial microcapsule anti-sulfate erosion system of structural concrete
  • Microbial microcapsule anti-sulfate erosion system of structural concrete
  • Microbial microcapsule anti-sulfate erosion system of structural concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] First configure the culture medium containing sulfate-reducing bacteria, the concentration of sulfate-reducing bacteria of the genus Desulfurium is 10 9 cell / ml, add K 2 HPO 4 0.5g,NH 4 Cl 1g, Na 2 SO 4 1g, CaCl 2 2H 2 O 0.1g, MgSO 4 ·7H2 O 2g, 70% sodium lactate solution 5g, distilled water 1000mL, Fe(NH 4 ) 2 (SO 4 ) 2 6H 2 O 0.2 g. Prepare microbial microcapsules by traditional in-situ polymerization method: weigh 50 grams of urea and 90 grams of formaldehyde to make a mixed solution, adjust the pH to 8-9 with dilute NaOH solution, and then conduct a heating reaction in a water bath for a period of time until it is completely dissolved to obtain a prepolymer body. Emulsify the culture medium containing sulfate-reducing bacteria in SDBS (sodium dodecylbenzenesulfonate) solution for a period of time, then add it to the prepolymer solution and adjust the pH to 2-2.5 with dilute acid solution, while raising the temperature to 55 ℃, stirred and reacted for 2...

Embodiment 2

[0081] Referring to the method in Example 1, experiments were carried out on Desulfococcus, Desulfosarcina and Desulfurina sulfate-reducing bacteria respectively. The specific experimental conditions are shown in Table 1.

[0082] Table 1

[0083]

[0084]

[0085] With reference to the steps of Example 1 for the microcapsules of the obtained Desulfococcus, Desulfosarcina and Desulfurina sulfate-reducing bacteria, prepare respective corresponding concrete containing microbial microcapsules, and then proceed with Example 1 The same initial damage test as in the immersion test. After observing the experimental results, it was found that sulfur precipitated on the surface of the cracks in the microcapsule concrete of the four microorganisms, and the longer the curing time, the more sulfur precipitated. The greater the initial damage, the greater the sulfur precipitation.

[0086] It can be seen that the sulfur precipitation generated by the microbial metabolism after the ...

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Abstract

The invention relates to the field of concrete engineering, in particular to a microbial microcapsule anti-sulfate erosion system of structural concrete. The invention provides the microbial microcapsule anti-sulfate erosion system of underground structural concrete, which comprises a concrete matrix and microbial microcapsules inside the concrete matrix, wherein sulfate reducing bacteria and culture media suitable for the growth of the sulfate reducing bacteria are coated inside the microbial microcapsules. Compared with the prior anti-sulfate erosion method, the microbial microcapsule anti-sulfate erosion system provided by the invention has the following advantages that the intelligent control of the sulfate concentration can be realized, and the sulfate erosion degree is reduced; sulfur precipitants can be generated simultaneously with the reduction of the concentration of sulfate ions to block sulfate erosion passageways; the microcapsules can protect the internal microorganisms and culture media from the effects of the external environment, so the anti-sulfate erosion capability of the microorganisms and the culture media is effective for a long time; and large-range restoring can be realized.

Description

technical field [0001] The invention relates to the field of concrete engineering, in particular to a system for resisting sulfate corrosion of structural concrete microbial microcapsules. Background technique [0002] Underground structures (such as urban rail transit tunnel structures) have a design life of 100 years, where the rock and soil conditions are complex, the surrounding environment is sensitive, the train running density is extremely high, and the service conditions are harsh. Once damaged, it is difficult or irreplaceable, and will induce underground engineering disasters. Sulfate attack is an important part of the durability of concrete, and it is also the most complex and harmful environmental water attack, such as Kang Jingfu, Several basic issues in the study of concrete sulfate attack [J], Concrete, As recorded in 1995, 3:9-18, in recent years, in railways, highways, mines and hydropower projects, the problem of sulfate erosion and damage of concrete stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/00
Inventor 朱合华周帅闫治国陈庆
Owner TONGJI UNIV
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