CN112225501A - Concrete for preventing microbial corrosion and preparation method thereof - Google Patents
Concrete for preventing microbial corrosion and preparation method thereof Download PDFInfo
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- CN112225501A CN112225501A CN202010997338.4A CN202010997338A CN112225501A CN 112225501 A CN112225501 A CN 112225501A CN 202010997338 A CN202010997338 A CN 202010997338A CN 112225501 A CN112225501 A CN 112225501A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2092—Resistance against biological degradation
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Abstract
The invention discloses a concrete for preventing microbial corrosion and a preparation method thereof. The concrete for preventing microbial corrosion comprises the following raw materials, by weight, 216-265 parts of portland cement, 450-565 parts of coarse aggregate, 490-630 parts of fine aggregate, 54-160 parts of mineral admixture, 4-10 parts of a biological inhibitor and 86-137 parts of a hydrophobic compound pore plug; the biological inhibitor comprises 2-4 parts of quaternary ammonium salt wall-breaking agent, 1-3 parts of isothiazolinone, 0.5-2 parts of alkyl nitrobenzene bromide and 0.5-1 part of calcium formate. The concrete for preventing microbial corrosion can be used in industrial buildings and concrete buildings of lakes and rivers, and has the advantages of enhancing the corrosion resistance of the concrete and saving the cost; in addition, the preparation method has the advantages of simple and convenient operation and strong stability.
Description
Technical Field
The application relates to the technical field of concrete, in particular to concrete for preventing microbial corrosion and a preparation method thereof.
Background
Concrete is the most widely used and most used civil engineering material in the world today. The characteristics of the concrete structure material and the using environment cause the problems of insufficient durability and the like of the concrete structure, which causes great economic loss to the country, and the problems of resource, energy and environmental protection caused by the problem are more and more prominent.
However, in recent years, microbial corrosion of concrete is receiving more and more attention, and particularly, in industrial buildings and lakes and rivers, a large number of microbes of different types are often contained, and metabolites of the microbes cause corrosion of reinforced concrete, so that the surfaces of the reinforced concrete are stained, the surface layers are loose, mortar falls off, aggregates are exposed, cracking and steel bar corrosion are generated in severe cases, the service life of reinforced concrete facilities is shortened, the maintenance cost is increased, and serious economic loss is caused. It has been found that the biochemical process corrosion process caused by microorganisms is part of the natural sulfur cycle, and the result of the chemical reaction is called biological sulfuric acid corrosion, and experiments prove that biological sulfuric acid formed by metabolism of bacteria such as Sulfur Oxidizing Bacteria (SOB) and Sulfate Reducing Bacteria (SRB) in sewage or river water is a main cause of concrete corrosion.
Disclosure of Invention
To the problem that exists in the above technique, the application provides a concrete of preventing microbial corrosion, has good corrosion protection performance, increases the service life of concrete, reduces the overhaul number of times, practices thrift the cost.
Meanwhile, the application also provides a preparation method of the concrete for preventing microbial corrosion, which has the advantages of safe and simple operation and strong stability.
The application provides a concrete for preventing microbial corrosion, which comprises the following raw materials in parts by weight:
216-265 parts of cementing material
450-565 parts of coarse aggregate
490-630 parts of fine aggregate
54-160 parts of mineral admixture
4-10 parts of biological inhibitor
86-137 parts of a hydrophobic compound pore plug;
the biological inhibitor comprises 2-4 parts of quaternary ammonium salt wall-breaking agent, 1-3 parts of isothiazolinone, 0.5-2 parts of alkyl nitrobenzene bromide and 0.5-1 part of calcium formate.
By adopting the technical scheme, the concrete is added with the biological inhibitor: quaternary aminesSalt wall breaking agent, isothiazolinone, alkyl azobenzene bromide and calcium formate. In an anaerobic environment, sulfate reducing bacteria reduce sulfate or organic sulfur at the bottom of the pipeline into hydrogen sulfide (H)2S)，H2S enters the unfilled space of the concrete pipeline and is oxidized into biological sulfuric acid by sulfur oxidizing bacteria. At this time, the addition of the biostatic agent destroys the reaction chain of the conversion of the organic sulfur element. The quaternary ammonium salt wall-breaking agent and the isothiazolinone act synergistically to break cell walls of sulfate reducing bacteria and sulfur oxidizing bacteria, and meanwhile, the isothiazolinone can change the structure of a cell membrane, promote alkyl nitrobenzene bromide and calcium formate to enter the cell, break various components in the cell, inactivate enzymes in the cell or cannot synthesize the enzymes, so that the growth and the reproduction of the sulfate reducing bacteria and the sulfur oxidizing bacteria are inhibited or killed. Therefore, the biological sulfuric acid is prevented from reacting with calcium hydroxide in the concrete to form gypsum, the gypsum cannot further react with redundant tricalcium aluminate in the concrete to generate an expansive product ettringite, and the concrete is cracked, so that the phenomenon that microorganisms corrode the concrete is solved fundamentally.
Furthermore, the quaternary ammonium salt wall-breaking agent is mainly prepared by uniformly mixing powdery dodecyl dimethyl benzyl ammonium chloride and liquid quaternary ammonium silane and drying.
Further, the dodecyl dimethyl benzyl ammonium chloride and the quaternary ammonium silane are mixed according to the weight ratio of 1: 1.
by adopting the technical scheme, the dodecyl dimethyl benzyl ammonium chloride and the quaternary ammonium silane are mixed to form the quaternary ammonium salt wall breaking agent with strong functionality, sulfate reducing bacteria and sulfur oxidizing bacteria which cause the cell walls of the sulfate reducing bacteria and the sulfur oxidizing bacteria to become tough because of continuously adapting to the external environment in nature are attacked, and the cell walls of the sulfate reducing bacteria and the sulfur oxidizing bacteria are damaged. Through screening of the composition and the dosage of the quaternary ammonium salt wall-breaking agent, the dodecyl dimethyl benzyl ammonium chloride and the quaternary ammonium silane are found to be mixed according to the weight ratio of 1:1, the most significant effect on the cell walls of sulfate-reducing bacteria and sulfur-oxidizing bacteria.
The asphalt-free asphalt further comprises 15-18 parts by weight of acid-resistant organic resin, wherein the acid-resistant organic resin is formed by mixing polystyrene-acrylic resin and asphalt in a weight ratio of 1: 2.
By adopting the technical scheme, acid-resistant organic resin is added into the concrete to play a role in slowly releasing the biological inhibitor. Due to the adhesiveness of the asphalt, the polystyrene-acrylic resin and the mineral admixture are promoted to jointly form asphalt mucilage, the asphalt mucilage wraps the biological inhibitor on the inner layer of the concrete to form a protective film on the pipe wall, so that the dissolution of the biological inhibitor by sewage or lake and river water is reduced, the release rate of the biological inhibitor is reduced, and the long-term effective sterilization can be realized.
Further, the mineral admixture comprises 10-50 parts of fly ash, 10-30 parts of silica fume, 30-60 parts of slag and 4-20 parts of quicklime.
Further, the mineral admixture comprises 20-30 parts of fly ash, 15-20 parts of silica fume, 40-50 parts of slag and 8-12 parts of quick lime.
The application provides a preparation method of concrete for preventing microbial corrosion, which has the technical scheme that: a preparation method of concrete for preventing microbial corrosion comprises the following steps:
s1, weighing the mineral admixture according to the corresponding weight part, and uniformly mixing to obtain the mineral admixture;
s2, weighing the biological inhibitor according to the corresponding weight parts, and uniformly mixing to obtain the biological inhibitor;
and S3, mixing the mineral admixture, the biological inhibitor and other raw materials, and uniformly stirring to obtain the concrete for preventing microbial corrosion.
Further, in S2, isothiazolinone in liquid form in the bio-suppressant is previously powdered, respectively.
In summary, the present application has the following beneficial effects:
firstly, as the application adopts the method of adding the powdery filler biological inhibitor into the common concrete mixture,
the synergistic effect of the components in the biological inhibitor kills or inhibits the growth and reproduction of sulfate reducing bacteria and sulfur oxidizing bacteria which play a main role in the corrosion process.
Secondly, in the application, acid-resistant organic resin is preferably added into concrete, so that the acid-resistant organic resin and mineral admixture form asphalt mucilage together, the asphalt mucilage wraps the biological inhibitor on the inner layer of the concrete to form a layer of protective film on the pipe wall, thereby reducing the dissolution of the biological inhibitor by sewage or lake and river water, reducing the release rate of the biological inhibitor and further effectively sterilizing for a long time.
Detailed Description
The present invention will be described in further detail with reference to examples. The materials used in the preparation examples, examples and comparative examples were purchased from commercial sources. Adding zeolite into liquid isothiazolinone, and adsorbing with zeolite as carrier to obtain powder.
Preparation example of intermediate
Preparation of quaternized silanes
Preparation example 1
Sequentially adding 62.4g (0.21mol) of N, N-dimethyl octadecylamine, 60g of isopropanol solvent and a trace antioxidant into a four-necked flask provided with a thermometer, a stirrer and a reflux condenser, and stirring and heating to a set reaction temperature; dripping 39.7g (0.2mol) of gamma-chloropropyltrimethoxysilane and a catalyst potassium iodide solution, and continuously reacting for 24-36 h; filtering to remove insoluble antioxidant residue, and recovering solvent and unreacted product under reduced pressure; and adding solid acid to remove residual trace tertiary amine and decoloring to obtain light yellow transparent liquid quaternized silane BFS.
Preparation of quaternary ammonium salt wall-breaking agent
Preparation example 2
And pouring 2kg of powdery dodecyl dimethyl benzyl ammonium chloride into 2kg of liquid quaternary ammonium silane, quickly stirring uniformly, and drying to form the granular quaternary ammonium salt wall breaking agent.
Preparation example 3
And pouring 3kg of powdery dodecyl dimethyl benzyl ammonium chloride into 1kg of liquid quaternary ammonium silane, quickly stirring uniformly, and drying to form the granular quaternary ammonium salt wall breaking agent.
Preparation example 4
And pouring 1kg of powdery dodecyl dimethyl benzyl ammonium chloride into 3kg of liquid quaternary ammonium silane, quickly stirring uniformly, and drying to form the granular quaternary ammonium salt wall breaking agent.
Examples
Example 1
S1, weighing 10kg of fly ash, 10kg of silica fume, 30kg of slag and 4kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 2, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 216 kg of portland cement, 450 kg of coarse aggregate, 490 kg of fine aggregate, 5kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at the speed of 45r/min for 20min, and stirring to obtain the concrete capable of preventing microbial corrosion.
Example 2
S1, weighing 30kg of fly ash, 20kg of silica fume, 45kg of slag and 12kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 3, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 240.5 kg of portland cement, 508 kg of coarse aggregate, 560 kg of fine aggregate, 7kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combination hole plug, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Example 3
S1, weighing 50kg of fly ash, 30kg of silica fume, 60kg of slag and 20kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 3kg of isothiazolinone, 1.5kg of alkyl nitrobenzene bromide, 0.9kg of calcium formate and 4kg of quaternary ammonium salt prepared in preparation example 4, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 265 kg of portland cement, 565 kg of coarse aggregate, 630 kg of fine aggregate, 6kg of acid-resistant organic resin uniformly mixed with the polystyrene-acrylic resin and 12kg of asphalt, and 137 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at the speed of 45r/min for 20min, and thus obtaining the concrete capable of preventing microbial corrosion.
Example 4
S1, weighing 20kg of fly ash, 15kg of silica fume, 40kg of slag and 8kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 3, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 216 kg of portland cement, 450 kg of coarse aggregate, 630 kg of fine aggregate, 6kg of acid-resistant organic resin uniformly mixed with the polystyrene-acrylic resin and 12kg of asphalt, and 86 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at the speed of 45r/min for 20min, and thus obtaining the concrete capable of preventing microbial corrosion.
Example 5
S1, weighing 25kg of fly ash, 17kg of silica fume, 45kg of slag and 10kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 2, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 240.5 kg of portland cement, 508 kg of coarse aggregate, 560 kg of fine aggregate, 5kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combination hole plug, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Example 6
S1, weighing 30kg of fly ash, 20kg of silica fume, 50kg of slag and 12kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 3kg of isothiazolinone, 1.5kg of alkyl nitrobenzene bromide, 0.9kg of calcium formate and 4kg of quaternary ammonium salt prepared in preparation example 4, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 265 kg of portland cement, 565 kg of coarse aggregate, 560 kg of fine aggregate, 7kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 137 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at the speed of 45r/min for 20min, and stirring to obtain the concrete capable of preventing microbial corrosion.
Example 7
S1, weighing 30kg of fly ash, 15kg of silica fume, 45kg of slag and 10kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 2kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 2, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 240.5 kg of portland cement, 508 kg of coarse aggregate, 630 kg of fine aggregate, 5kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combination hole plug, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Example 8
S1, weighing 25kg of fly ash, 17kg of silica fume, 60kg of slag and 10kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.9kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 3, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 240.5 kg of portland cement, 450 kg of coarse aggregate, 490 kg of fine aggregate, 10kg of polystyrene-acrylic resin, 5kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combination hole plug, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Example 9
S1, weighing 60kg of fly ash, 40kg of silica fume, 50kg of slag and 10kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 5kg of isothiazolinone, 3kg of alkyl nitrobenzene bromide, 4kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 4, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain a biological inhibitor;
and S3, weighing 265 kg of portland cement, 565 kg of coarse aggregate, 630 kg of fine aggregate, 7kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 137 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at the speed of 45r/min for 20min, and stirring to obtain the concrete capable of preventing microbial corrosion.
Example 10
S1, weighing 6kg of fly ash, 6kg of silica fume, 35kg of slag and 7kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 0.5kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 3, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 216 kg of portland cement, 450 kg of coarse aggregate, 490 kg of fine aggregate, 6kg of acid-resistant organic resin uniformly mixed with polystyrene-acrylic resin and 12kg of asphalt, and 86 kg of hydrophobic combined hole plugs, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Comparative example
Comparative example 1
S1, weighing 25kg of fly ash, 17kg of silica fume, 45kg of slag and 10kg of quicklime, putting the materials into a dry powder stirrer, stirring at the speed of 50r/min for 15min to obtain a mineral admixture;
s2, weighing 1kg of isothiazolinone, 0.5kg of alkyl nitrobenzene bromide, 0.5kg of calcium formate and 4kg of quaternary ammonium salt prepared in the preparation example 2, and putting the materials into a dry powder stirrer, wherein the stirring speed is 35r/min, and stirring for 5min to obtain the biological inhibitor;
and S3, weighing 240.5 kg of portland cement, 508 kg of coarse aggregate, 560 kg of fine aggregate, 5kg of polystyrene-acrylic resin, 10kg of asphalt, uniformly mixed acid-resistant organic resin and 86 kg of hydrophobic combination hole plug, putting the obtained mixture into a concrete mixer, adding the mineral admixture obtained in the step S1 and the biological inhibitor obtained in the step S2 into the concrete mixer, adding water, stirring at a speed of 45r/min, and stirring for 20min to obtain the concrete capable of preventing microbial corrosion.
Comparative example 2
The difference from comparative example 1 is that no acid-resistant organic resin is added.
Comparative example 3
The difference from comparative example 1 is that no biostatic agent was added.
Comparative example 4
The difference from comparative example 1 is that no acid-resistant organic resin and no biostatic agent are added.
Comparative example 5
The difference from the comparative example 1 is that no quaternary ammonium salt wall breaking agent is added.
Comparative example 6
The difference from comparative example 1 is that no isothiazolinone is added.
Comparative example 7
The difference from comparative example 1 is that no alkylnitrobenzyl bromide was added.
Comparative example 8
The difference from comparative example 1 is that alkyl nitrobenzene bromide and calcium formate are not added.
Comparative example 9
The difference from the comparative example 1 is that no quaternary ammonium salt wall breaking agent and no isothiazolinone are added.
Performance test
The components in examples 1-12 and comparative examples 1-4 were mixed as follows: the test is 100:1, the anti-corrosion concrete is prepared, and after curing and soaking, the concrete is soaked again with sulfur oxidizing bacteria for anti-corrosion detection.
Detection method
1) Preparation of concrete test piece
The weight of each component is reduced by 100 times in the embodiment, water is added into the components, the mixture is uniformly stirred, and the mixture is molded in a test die with 100X 100mm to prepare a concrete test piece. The test was carried out after 28 days of curing.
2) Concrete soaking is carried out
And (4) taking sterile water, and respectively soaking the prepared concrete test piece in a reactor filled with the sterile water in a half-soaking mode and a full-soaking mode.
3) Culturing microorganisms for corrosion
Taking activated sulfurThe acid salt reducing bacteria and the sulfur oxidizing bacteria are inoculated into 150mL of prepared SPG culture medium ((g/L): PIPES 6.5, NaCl 25, MgSO4·7H2O 2.7，MgCl2·6H2O 4.3，NH4Cl 0.25，KCl 0.5，CaCl2·2H2O 0.14，K2HPO4·3H2O 0.14，Fe(NH4)2(SO4)2·6H2O 0.002，Na2S2O3·5H2O2.48, 1mL of trace element solution, 0.003g of phenol red, 10mL of vitamin solution and 1000mL of distilled water; adjusting the pH to 7.6, 1X 10 with NaOH5Sterilizing for 30min under Pa; the cells were cultured in a shaking incubator at 35 ℃ and 170r/min for 4 days and then used for the test.
4) Carrying out a microorganism corrosion concrete test
The cultured sulfate reducing bacteria and sulfur oxidizing bacteria are dropped into a reactor for half-leaching and full-leaching according to the amount of 0.5mL of bacterial liquid/100 mL of water for carrying out a soaking test. And placing the reactor into a biochemical incubator for 6 months and 1 year, respectively detecting the colony numbers of sulfate reducing bacteria and sulfur oxidizing bacteria on the concrete twice, and observing whether the aggregate is exposed at a half-leaching position and a full-leaching position.
5) Comparing the colony numbers of the sulfate reducing bacteria and the sulfur oxidizing bacteria on the concrete test piece with those of the sulfate reducing bacteria and the sulfur oxidizing bacteria when the concrete test piece is put in the concrete test piece, if the colony numbers are less, the effect of the biological inhibitor is obvious, and vice versa; meanwhile, whether aggregate exposure occurs at the semi-immersion position or not and whether aggregate exposure occurs at the immersion liquid level position or not are observed.
TABLE 1 Corrosion of concrete test pieces against microbial corrosion
As can be seen from Table 1 above, the addition of the biostatic agent and the acid-resistant organic resin to the concrete significantly reduces the number of colonies of sulfate-reducing bacteria and sulfur-oxidizing bacteria, reduces the exposure of the aggregate, and prevents the enhancement of the function of the concrete due to the corrosion of microorganisms. As can be seen by combining the examples 1 to 10, the quaternary ammonium salt wall-breaking agent prepared according to the ratio of 1:1 has the best effect, and the acid-resistant organic resin formed by mixing the polystyrene-acrylic resin and the asphalt according to the ratio of 1:2 has the best effect, wherein the example 5 is selected as the best example in the application, and the example 5 is selected as the comparative example 1 to be compared with other comparative examples. Combining examples 9 and 10, it can be seen that the amount of mineral admixture added has some effect on the protection of concrete against microbial corrosion.
The biological inhibitor firstly inhibits or kills sulfate reducing bacteria and sulfur oxidizing bacteria, and the acid-resistant organic resin and the mineral admixture act together to form green mucilage, so that the slow release effect is achieved, the dissolution of the biological inhibitor by sewage or lake and river water is reduced, and the release rate of the biological inhibitor is reduced. As can be seen by combining comparative example 1, comparative example 2 and comparative example 3, the number of colonies when only the biostatic agent is added and the acid-resistant organic resin is not added is less than the number of colonies when both the biostatic agent and the acid-resistant organic resin are added, which indicates that the biostatic agent releases more bactericidal components and inhibits or kills more sulfate-reducing bacteria and sulfur-oxidizing bacteria without the slow release effect of the acid-resistant organic resin, so that the number of detected colonies of sulfate-reducing bacteria and sulfur-oxidizing bacteria is less. Only acid-resistant organic resin is added without adding biological inhibitor, so that sulfate reducing bacteria and sulfur oxidizing bacteria are not inhibited or killed, the colony number is obviously increased, and the corrosion prevention degree is weakened; particularly, no biological inhibitor is added, the colony number of sulfate reducing bacteria and sulfur oxidizing bacteria is obviously increased, the concrete test piece is seriously corroded, and the aggregate is exposed; meanwhile, biological inhibitor and acid-resistant organic resin are added, so that the effect of preventing microbial corrosion is obvious and long-acting.
By combining the comparative example 1 and the comparative example 4, it can be seen that the colony counts of sulfate reducing bacteria and sulfur oxidizing bacteria in concrete are greatly increased, aggregates are exposed and corrosion is severe when the biological inhibitor and the acid-resistant organic resin are not added, thereby showing that the effects of the biological inhibitor and the acid-resistant organic resin are remarkable.
By combining the comparative example 1, the comparative example 5 and the comparative example 6, the method can be seen that the quaternary ammonium salt wall-breaking agent and the isothiazolinone are not added, the number of the colonies of the sulfate reducing bacteria and the sulfur oxidizing bacteria is obviously increased, and the concrete test piece is seriously corroded; when no quaternary ammonium salt wall breaking agent is added, the fully-soaked aggregate and the semi-soaked aggregate are exposed, and the colony number of sulfate reducing bacteria and sulfur oxidizing bacteria is obviously much higher than that of sulfate reducing bacteria and sulfur oxidizing bacteria when no isothiazolinone is added, so that the cell walls of the sulfate reducing bacteria and the sulfur oxidizing bacteria can be completely destroyed only under the synergistic action of the quaternary ammonium salt wall breaking agent, other components in the biological inhibitor are promoted to enter cells to destroy substances in the cells, the generation of enzymes in the cells is prevented, and the cells cannot complete metabolism and die.
In combination with comparative example 1, comparative example 5, comparative example 7, comparative example 8 and comparative example 9, it can be seen that the biological inhibitor lacks any one of the components of quaternary ammonium salt and isothiazolinone or alkyl nitrobenzene bromide and calcium formate, the colony counts of sulfate reducing bacteria and sulfur oxidizing bacteria in the test piece are changed to different degrees, and the corrosion phenomena to different degrees indicate that the four components have different effects of preventing microbial corrosion.
The colony numbers of sulfate reducing bacteria and sulfur oxidizing bacteria detected after 6 months and 1 year of culture are compared, so that the colony numbers of the concrete test piece added with the acid-resistant organic resin twice in the biochemical incubator are equivalent, and the colony number of the concrete test piece not added with the acid-resistant organic resin after 1 year is obviously more than that after 6 months, which shows that the slow release effect of the green mucilage formed by the acid-resistant organic resin and the mineral admixture is obvious.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The concrete for preventing microbial corrosion is characterized by comprising the following raw materials in parts by weight:
216-265 parts of Portland cement
450-565 parts of coarse aggregate
490-630 parts of fine aggregate
54-160 parts of mineral admixture
4-10 parts of biological inhibitor
86-137 parts of a hydrophobic compound pore plug;
the biological inhibitor comprises 2-4 parts of quaternary ammonium salt wall-breaking agent, 1-3 parts of isothiazolinone, 0.5-2 parts of alkyl nitrobenzene bromide and 0.5-1 part of calcium formate.
2. The concrete for preventing microbial corrosion according to claim 1, wherein the quaternary ammonium salt wall-breaking agent is prepared by uniformly mixing powdery dodecyl dimethyl benzyl ammonium chloride and liquid quaternary ammonium silane and drying.
3. The concrete for preventing microbial corrosion according to claim 2, wherein the dodecyl dimethyl benzyl ammonium chloride and the quaternary ammonium silane are mixed according to a weight ratio of 1: 1.
4. the concrete for preventing microbial corrosion according to claim 1, further comprising 15-18 parts by weight of an acid-resistant organic resin, wherein the acid-resistant organic resin is prepared by mixing a polystyrene-acrylic resin and asphalt in a weight ratio of 1: 2.
5. the concrete for preventing microbial corrosion according to claim 1, wherein the mineral admixture comprises 10-50 parts of fly ash, 10-30 parts of silica fume, 30-60 parts of slag and 4-20 parts of quick lime.
6. The concrete for preventing microbial corrosion according to claim 5, wherein the mineral admixture comprises 20-30 parts of fly ash, 15-20 parts of silica fume, 40-50 parts of slag and 8-12 parts of quick lime.
7. A method of producing a concrete according to any one of claims 1 to 6, characterised in that it comprises at least the following steps:
s1, weighing the mineral admixture according to the corresponding weight part, and uniformly mixing to obtain the mineral admixture;
s2, weighing the biological inhibitor according to the corresponding weight parts, and uniformly mixing to obtain the biological inhibitor;
and S3, mixing the mineral admixture, the biological inhibitor and other raw materials, and uniformly stirring to obtain the concrete for preventing microbial corrosion.
8. The method of claim 7, wherein the isothiazolinone in the bio-inhibitor is prepared in the form of powder in advance in S2.
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