CN112390563A - Preparation method of concrete additive resisting microbial corrosion under action of magnetic field - Google Patents
Preparation method of concrete additive resisting microbial corrosion under action of magnetic field Download PDFInfo
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- CN112390563A CN112390563A CN202011239463.5A CN202011239463A CN112390563A CN 112390563 A CN112390563 A CN 112390563A CN 202011239463 A CN202011239463 A CN 202011239463A CN 112390563 A CN112390563 A CN 112390563A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/67—Biocides
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Abstract
The invention relates to the field of composite materials, in particular to a preparation method of a concrete admixture with microbial corrosion resistance under the action of a magnetic field. The invention aims to solve the problem that concrete is easy to be corroded by microorganisms in a sewage pipeline. Under the action of microorganisms in the sewer, sulfur oxidizing bacteria can generate sulfuric acid under the biochemical action, so that the surface of concrete is corroded, and the durability and the physical performance of the concrete are obviously reduced. Therefore, the invention discloses a preparation method of a microbial corrosion resistant concrete admixture under the action of a magnetic field, which comprises the following components: 100 parts of sodium naphthalene sulfonate solution, 2 parts of silver molybdate, 10 parts of calcium tungstate and 1 part of hydroxypropyl cellulose. When the concrete is stirred, the prepared admixture is directly added into the concrete, and the anti-microbial corrosion capability of the concrete can be improved.
Description
Technical Field
The invention relates to the field of composite materials, in particular to a preparation method of a concrete admixture with microbial corrosion resistance under the action of a magnetic field.
Background
In industrial and municipal sewage discharge, there are often large numbers of different kinds of microorganisms associated with it, and the microbial corrosion of concrete caused by microbial metabolism is called microbial corrosion of concrete. Under the action of microbial corrosion, aggregate is exposed, and cracking and steel bar corrosion can be generated in severe cases, so that the service cycle of concrete is obviously shortened. According to statistics, the proportion of microbial corrosion in the destruction of German building materials is 10-20%. In the 70 s of the 20 th century, the maintenance costs of sewage piping systems in hamburger, germany alone, caused by microbial corrosion, were as high as 5000 ten-thousand macks. A concrete sewer line of 1900km total length in los Angeles, 208km of which has been destroyed by microbial corrosion, costs up to $ 4 million for repair and replacement.
The current measures for preventing and controlling the microbial corrosion of concrete mainly comprise three major technologies of concrete modification, surface coating protection and biological killing. From the practical effect, both the concrete modification and the inert protection layer are typical passive measures, and the corrosion and deterioration processes of the concrete cannot be obviously relieved; the biological killing technology is established on the basis of the action mechanism of microbial corrosion, is a typical active measure and represents the development direction of the microbial corrosion control of concrete.
Therefore, the invention is based on the biological killing technology, creatively introduces silver molybdate and calcium tungstate to inhibit the growth of microorganisms, successfully synthesizes the antimicrobial corrosion-resistant concrete admixture under the action of the magnetic field under the action of the self-made magnetic field auxiliary stirring device, and has profound significance for improving the durability of concrete in the sewage discharge system in China and reducing the maintenance cost of the sewage discharge system.
Disclosure of Invention
The invention aims to solve the problem that concrete is easily corroded by microorganisms in a sewage pipeline. Under the action of microorganisms in the sewer, sulfur oxidizing bacteria can generate sulfuric acid under the biochemical action, so that the surface of concrete is corroded, and the effect has obvious influence on the comprehensive performance of the concrete. The preparation method of the microbial corrosion resistant concrete admixture under the action of the magnetic field is carried out according to the following steps:
(1) adding 1 part of hydroxypropyl cellulose into 100 parts of 40% sodium naphthalenesulfonate aqueous solution, and stirring for 5 hours at 40-55 ℃ to obtain solution A;
(2) putting the liquid A into a self-made magnetic field auxiliary stirring device, adding 2 parts of silver molybdate under the action of a magnetic field of 355-500mT, and stirring for 1-3h to obtain liquid B;
(3) 10 parts of silver tungstate is added into the liquid B and stirred for 2-4h under the action of a magnetic field of 200-500mT, and the concrete admixture for resisting the microbial corrosion under the action of the magnetic field is obtained.
Preferably, the stirring speed in the step (1) is 120-130 r/min.
Preferably, the stirring temperature in the step (2) is 60-70 ℃, and the stirring speed is greater than or equal to the critical speed Nc1, wherein Nc1 and the magnetic field strength T1 in the step (2) meet the following conditions:
Nc1＝226-50.84T1
where T1 is in units of T and Nc1 is in units of r/min.
Preferably, in the step (3), the stirring speed is greater than or equal to the critical speed Nc2, wherein Nc2 and the magnetic field strength T2 in the step (3) satisfy the following conditions:
Nc2＝226-30.72T2
where T2 is in units of T and Nc2 is in units of r/min.
Preferably, when in actual use, the addition amount of the additive added into the concrete is 0.2 percent of the total mass of the rubber material in the concrete.
The invention has the following beneficial effects:
1. the antimicrobial corrosion resistant concrete admixture prepared by the invention can obviously improve the antimicrobial corrosion resistance of concrete under the action of a magnetic field;
2. the concrete admixture with the function of resisting microbial corrosion under the action of a magnetic field prepared by the invention has small mixing amount and has no negative influence on other performances of the concrete;
3. the concrete admixture with the function of resisting microbial corrosion under the action of the magnetic field, which is prepared by the invention, has the advantages of simple process and good repeatability, and is suitable for large-scale industrial production.
Drawings
FIG. 1 is a comparison of the number of colonies before and after oscillation of thiobacillus thiooxidans;
fig. 2 is a schematic diagram of the principle of the self-made magnetic field auxiliary stirring device:
in fig. 2: 1. a stirring mechanism; 2. a steam heating mechanism; 3. a heat-resistant coil; 4. a stainless steel upper cover; 5. a binding post A; 6. a binding post B; 7. inner liner 8, outer shell.
Detailed Description
The first embodiment is as follows: the preparation method of the waste recycling self-repairing setting accelerator comprises the following steps:
(1) adding 1 part of hydroxypropyl cellulose into 100 parts of 40% sodium naphthalenesulfonate aqueous solution, and stirring at 40 ℃ at a speed of 120r/min for 5 hours to obtain a solution A;
(2) putting the liquid A into a self-made magnetic field auxiliary stirring device, adding 2 parts of silver molybdate under the action of a 355mT magnetic field, stirring at 60 ℃ and at a speed of 210r/min for 1h to obtain a liquid B;
(3) and adding 10 parts of silver tungstate into the liquid B, stirring under the action of a magnetic field of 500mT at the stirring temperature of 60 ℃ and the stirring speed of 220r/min for 2 hours to obtain the concrete admixture for resisting the microbial corrosion under the action of the magnetic field.
The embodiment has the following beneficial effects:
1. the antimicrobial corrosion resistant concrete admixture prepared by the invention can obviously improve the antimicrobial corrosion resistance of concrete under the action of a magnetic field;
2. the concrete admixture with the function of resisting microbial corrosion under the action of a magnetic field prepared by the invention has small mixing amount and has no negative influence on other performances of the concrete;
3. the concrete admixture with the function of resisting microbial corrosion under the action of the magnetic field, which is prepared by the invention, has the advantages of simple process and good repeatability, and is suitable for large-scale industrial production.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the step (1), the stirring temperature was 45 ℃.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the step (2), the magnetic field is 400mT, and the stirring speed is 210 r/min.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: in the step (2), the magnetic field is 500mT, and the stirring speed is 205 r/min.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the step (3), the magnetic field is 350mT, and the stirring speed is 220 r/min.
The beneficial effects of the invention are verified by the following tests:
the test is realized according to the following steps:
(1) adding 1 part of hydroxypropyl cellulose into 100 parts of 40% sodium naphthalenesulfonate aqueous solution, and stirring at 40 ℃ at a speed of 120r/min for 5 hours to obtain a solution A;
(2) putting the liquid A into a self-made magnetic field auxiliary stirring device, adding 2 parts of silver molybdate under the action of a 355mT magnetic field, stirring at 60 ℃ and at a speed of 210r/min for 1h to obtain a liquid B;
(3) adding 10 parts of silver tungstate into the liquid B, stirring under the action of a magnetic field of 500mT, wherein the stirring temperature is 60 ℃, the stirring speed is 220r/min, and stirring for 2 hours to obtain the antimicrobial corrosion concrete admixture under the action of the magnetic field;
(4) the prepared concrete admixture for resisting the microbial corrosion under the action of the magnetic field is added into concrete when the concrete is mixed, wherein the mixing amount is 0.2 percent of the total mass of rubber materials in the concrete, and the specific ratio is as shown in Table 1:
TABLE 1 concrete mix proportion for experiments
(5) Preparing the fully mixed concrete into a test block with the size of 100 x 10 x 14mm, and continuously soaking the prepared concrete in warm water at 42 ℃ for 7 d;
(6) crushing concrete in a mortar, placing the crushed concrete in a container with the temperature of 25 ℃ and the humidity of 95%, and continuously introducing carbonic acid gas for 7d to remove alkali;
(7) placing the obtained concrete sample into a conical flask, adding 0.75g of phosphate buffer with pH value of 7, then placing the concrete sample into 50mL of thiobacillus thiooxidans bacterial liquid, oscillating the thiobacillus thiooxidans bacterial liquid in an oscillator at the temperature of 30 +/-1 ℃ for 24 hours, and measuring the number of residual colonies of the thiobacillus thiooxidans;
(8) the concrete prepared in Table 2 was subjected to the above-mentioned steps (5) to (7), and the number of thiobacillus thiooxidans colonies was measured as comparative data.
TABLE 2 concrete mixing ratio for comparison experiment
The final data are shown in fig. 1, after the concrete is oscillated for 24 hours after the concrete is added with the antimicrobial corrosion concrete additive under the action of the magnetic field, the thiobacillus thiooxidans is completely killed, and the antimicrobial corrosion capability of the concrete is obviously improved by adding the additive.
As shown in fig. 2, the inner liner 7 is made of teflon and the outer shell 8 is made of stainless steel, which is a schematic diagram of the principle of the home-made magnetic field auxiliary stirring device. When the self-made magnetic field auxiliary stirring device works, the intensity of a magnetic field is controlled by adjusting the current of the binding post A, and liquid in the kettle is stirred under the synergistic effect of the magnetic field.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A preparation method of a concrete admixture resisting microbial corrosion under the action of a magnetic field is characterized by comprising the following steps: the method comprises the following steps:
(1) adding 1 part of hydroxypropyl cellulose into 100 parts of 40% sodium naphthalenesulfonate aqueous solution, and stirring for 5 hours at 40-55 ℃ to obtain solution A;
(2) putting the liquid A into a self-made magnetic field auxiliary stirring device, adding 2 parts of silver molybdate under the action of a magnetic field of 355-500mT, and stirring for 1-3h to obtain liquid B;
(3) 10 parts of silver tungstate is added into the liquid B and stirred for 2-4h under the action of a magnetic field of 200-500mT, and the concrete admixture for resisting the microbial corrosion under the action of the magnetic field is obtained.
2. The method for preparing the concrete admixture with the effect of resisting the microbial corrosion under the action of the magnetic field according to claim 1, wherein the concrete admixture comprises the following components in percentage by weight: the stirring speed in the step (1) is 120-130 r/min.
3. The method for preparing the concrete admixture with the effect of resisting the microbial corrosion under the action of the magnetic field according to claim 1, wherein the concrete admixture comprises the following components in percentage by weight: the stirring temperature in the step (2) is 60-70 ℃, the stirring speed is greater than or equal to the critical speed Nc1, wherein Nc1 and the magnetic field intensity T1 in the step (2) meet the following conditions:
Nc1＝226-50.84T1
where T1 is in units of T and Nc1 is in units of r/min.
4. The method for preparing the concrete admixture with the effect of resisting the microbial corrosion under the action of the magnetic field according to claim 1, wherein the concrete admixture comprises the following components in percentage by weight: in the step (3), the stirring speed is greater than or equal to the critical speed Nc2, wherein Nc2 and the magnetic field strength T2 in the step (3) meet the following conditions:
Nc2＝226-30.72T2
where T2 is in units of T and Nc2 is in units of r/min.
5. The method for preparing the concrete admixture with the effect of resisting the microbial corrosion under the action of the magnetic field according to claim 1, wherein the concrete admixture comprises the following components in percentage by weight: when in actual use, the addition amount of the additive added into the concrete is 0.2 percent of the total mass of the rubber material in the concrete.
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Citations (8)
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|---|---|---|---|---|
| WO1993005345A1 (en) * | 1991-08-28 | 1993-03-18 | Commonwealth Scientific And Industrial Research Organisation | Mixing during microwave or rf heating |
| WO1998056730A1 (en) * | 1997-06-11 | 1998-12-17 | Doppel Co., Ltd. | Antimicrobial artificial stone and process for the production thereof |
| KR20060014449A (en) * | 2002-11-29 | 2006-02-15 | 시나넨 제오믹 가부시키가이샤 | Antimicrobial agent for concrete, concrete composition and concrete article |
| CN101780980A (en) * | 2010-02-05 | 2010-07-21 | 河北理工大学 | Method for preparing ultrafine silver molybdate antibacterial powder by using ultrasonic wave |
| CN107265908A (en) * | 2017-07-31 | 2017-10-20 | 杨化飞 | A kind of concrete admixture of antimicrobial corrosion |
| CN108821792A (en) * | 2018-07-23 | 2018-11-16 | 浙江省交通规划设计研究院有限公司 | A method of improving concrete durability |
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2020
- 2020-11-09 CN CN202011239463.5A patent/CN112390563A/en active Pending
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| WO1993005345A1 (en) * | 1991-08-28 | 1993-03-18 | Commonwealth Scientific And Industrial Research Organisation | Mixing during microwave or rf heating |
| WO1998056730A1 (en) * | 1997-06-11 | 1998-12-17 | Doppel Co., Ltd. | Antimicrobial artificial stone and process for the production thereof |
| KR20060014449A (en) * | 2002-11-29 | 2006-02-15 | 시나넨 제오믹 가부시키가이샤 | Antimicrobial agent for concrete, concrete composition and concrete article |
| CN101780980A (en) * | 2010-02-05 | 2010-07-21 | 河北理工大学 | Method for preparing ultrafine silver molybdate antibacterial powder by using ultrasonic wave |
| CN107265908A (en) * | 2017-07-31 | 2017-10-20 | 杨化飞 | A kind of concrete admixture of antimicrobial corrosion |
| US20200267990A1 (en) * | 2017-09-15 | 2020-08-27 | Hecosol Gmbh | Anti-microbial coating |
| RU2677181C1 (en) * | 2017-10-31 | 2019-01-15 | Общество с ограниченной ответственностью "Новый ресурс" | Method of improving quality of building structures |
| CN108821792A (en) * | 2018-07-23 | 2018-11-16 | 浙江省交通规划设计研究院有限公司 | A method of improving concrete durability |
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| 刘智安: "《工业循环冷却水处理》", 30 September 2017, 中国轻工业出版社 * |
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