CN114620987A - Marine concrete with microbial corrosion effect - Google Patents
Marine concrete with microbial corrosion effect Download PDFInfo
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- CN114620987A CN114620987A CN202210458369.1A CN202210458369A CN114620987A CN 114620987 A CN114620987 A CN 114620987A CN 202210458369 A CN202210458369 A CN 202210458369A CN 114620987 A CN114620987 A CN 114620987A
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses marine concrete with a microbial corrosion effect, which is prepared from the following raw materials in parts by weight: 1800-2000 parts of aggregate, 220-240 parts of cement, 150-180 parts of water, 20-40 parts of fly ash, 2-6 parts of zinc oxide and 2-6 parts of calcium tungstate. The concrete provided by the invention takes zinc oxide and calcium tungstate as additives, and the zinc oxide causes damage to cell membranes and proteins through isomerization, polycondensation and other reactions to inhibit the growth of bacteria and even cause the death of bacteria, so that the formation of biological sulfuric acid or biological sulfate radicals is reduced, and the microbial corrosion damage of the concrete is reduced. The calcium tungstate powder can also improve the early strength of a cement matrix, improve the compactness of concrete, have remarkable effects on improving the workability, setting time, mechanical property and durability of the concrete, and can also effectively relieve the reduction of the pH value of the concrete.
Description
Technical Field
The invention relates to the technical field of marine construction engineering, in particular to marine concrete with a microbial corrosion effect.
Background
The marine concrete is applied to ocean engineering, and the concrete has required impermeability, frost resistance, corrosion resistance, performance of preventing steel bar corrosion and resisting ice slush impact besides strength and workability of a mixture to meet design and construction requirements. With the increasing application of marine concrete, the research on the corrosion prevention of marine concrete becomes more important. Research shows that the failure of concrete is related to the metabolism of microbes, i.e. biological sulfuric acid generated by the metabolism of sulfate reducing bacteria, sulfur oxidizing bacteria and other bacteria is the main cause of concrete corrosion.
The microbial corrosion action mechanism of the concrete is as follows: the initial pH value of the concrete surface is as high as 11-13, which is not suitable for the growth of bacteria, and H is required2S and CO2The neutralization effect firstly reduces the pH value of the surface of the concrete, the mesophilic bacteria can grow in the environment with higher pH value (-9), the pH value of the surface of the concrete is reduced to 4-5, environmental conditions and nutrient substances are provided for mass propagation of the acidophilic bacteria, and the acid production effect of metabolism of the acidophilic bacteria further reduces the pH value of the surface of the concrete to 1-2, so that the concrete is seriously corroded. According to the existing microbial corrosion mechanism, before biological sulfuric acid is formed, microorganisms are attached to the surface of concrete to form a biological film, and then the concrete can be corroded.
At present, the microbial corrosion research on concrete mainly focuses on corrosion under a land blow-off pipe sewage environment, the concrete corrosion under a marine environment focuses on reinforced concrete chloride ion corrosion, and the microbial corrosion does not attract attention and attention of people. If a method for killing or inhibiting the growth and reproduction or reducing the activity of microorganisms in contact with concrete in a marine environment can be found, the generation of biological sulfuric acid or biological sulfate radicals can be reduced, and the microbial corrosion damage of the concrete is further reduced.
Trace amounts of metal ions (e.g. Zn)2+) The balance of (a) is crucial for the survival of the bacteria, not only participating in the metabolism of a large number of enzymes but also balancing the stabilization of various protein structures. However, ZnO dissolved in water continuously releases Zn2+Large amount of Zn2+The balance is not adjusted, and the structure of the machine body is damaged more. Due to Zn2+The particle size is small enough to penetrate cell wall and cell membrane of bacteria to enter bacteria, and is divided into two parts to act on bacteria, and part of Zn2+Reacting with protein with transport function while passing through cell wall and cell membrane to change phospholipid arrangement mechanism, influence permeability of cell membrane to destroy relatively stable internal environment required by cell life activity, and obtain Zn2+The cell membrane enters the interior of the bacteria to react with groups with transfer and transport functions on the cell membrane, and simultaneously destroy an electron transfer system to inhibit the release of internal energy and destroy the activity in the bacteria so as to achieve the aim of sterilization. Accordingly, the present invention provides a marine concrete incorporating zinc oxide.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
In order to solve the problems, the invention provides marine concrete with a microbial corrosion effect. The concrete provided by the invention takes zinc oxide and calcium tungstate as additives, and the zinc oxide causes damage to cell membranes and proteins through isomerization, polycondensation and other reactions to inhibit the growth of bacteria and even cause the death of bacteria, so that the formation of biological sulfuric acid or biological sulfate radicals is reduced, and the microbial corrosion damage of the concrete is reduced. The calcium tungstate powder can also improve the early strength of a cement matrix, improve the compactness of concrete, have remarkable effects on improving the workability, setting time, mechanical property and durability of the concrete, and can also effectively relieve the reduction of the pH value of the concrete.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1800-2000 parts of aggregate, 220-240 parts of cement, 150-180 parts of water, 20-40 parts of fly ash, 2-6 parts of zinc oxide and 2-6 parts of calcium tungstate.
The prior technical scheme of the invention is as follows: the aggregate is composed of natural macadam and river sand.
The weight portions of the natural gravel and the river sand are respectively 800-850 parts and 1100-1200 parts.
The prior technical scheme of the invention is as follows: the natural limestone macadam is 20-40 mm of natural limestone macadam, the water absorption rate is 0.59%, and the compact packing density is 1570 kg.m-3Apparent density of 2690 kg.m-3The close packing porosity is 42%
The prior technical scheme of the invention is as follows: the aggregate is also subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate.
The prior technical scheme of the invention is as follows: the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent is 0.5-1% of the weight of the aggregate.
The prior technical scheme of the invention is as follows: the modification treatment method of the aggregate comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
The invention also provides a preparation method of the marine concrete, which comprises the following steps: weighing the raw materials according to the proportion, sequentially adding the aggregate, the cement and the fly ash into a stirrer, dry-stirring for 10-30s, uniformly mixing, then adding the zinc oxide and the calcium tungstate, finally adding the water, continuously stirring for 2-3min, taking out of the stirrer, and uniformly stirring to obtain the marine concrete.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the added zinc oxide has stronger photocatalysis effect, and generates an oxidative cavity (h +) and a reductive electron (e-) under the irradiation of sunlight. In and H2When O contacts, it is oxidized into strong oxidant hydroxyl radical (0H), and the highly active hydroxyl radical can be used to oxidize bacteria, viruses and various organic substances into C02And H20, and the like. And water and O2Under the condition of simultaneous existence, H is generated on the surface of the nano zinc oxide through multi-step reaction202 and other reactive oxygen species generate oxidation pressure on bacteria, and cell membranes and protein are damaged by isomerization, polycondensation and other reactions to inhibit the growth of the bacteria and even cause the death of the bacteria, so that the formation of biological sulfuric acid or biological sulfate radicals is reduced, and the microbial corrosion damage of concrete is reduced. The calcium tungstate powder can also improve the early strength of a cement matrix and can accelerate tricalcium silicate (C) in cement3S) prevents the conversion of ettringite (AFt) to monosulfur hydrated calcium sulfoaluminate (AFm). In addition, the calcium tungstate can improve the grain composition of the cementing material, has a good filling effect, replaces free water, further improves the compactness of concrete, has obvious and beneficial influences on the workability, the setting time, the mechanical property and the durability of the concrete, and can effectively relieve the reduction of the pH value of the concrete.
1. According to the invention, sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate modified aggregate are adopted, and when lignosulfonate is compounded with a polycarboxylic acid water reducing agent, the dispersing performance of the polycarboxylic acid water reducing agent can be improved, and the compactness of concrete can be improved; sodium nitrite early strength agent promotes C3AFt and C in A direction3S and C2S to Ca (OH)2Thereby promoting an increase in concrete strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The cement used in the following examples was PO42.5 portland cement. The used crushed stone is natural limestone crushed stone with the particle size of 20-40 mm, the water absorption rate is 0.59%, and the compact packing density is 1570 kg.m-3Apparent density of 2690 kg.m-3The close packing porosity was 42%.
Example 1
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stones, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash, 2.7kg of zinc oxide and 2.7kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Example 2
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash, 5.4kg of zinc oxide and 2.7kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Example 3
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash, 2.7kg of zinc oxide and 5.4kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Example 4
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash, 5.4kg of zinc oxide and 5.4kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Example 5
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 937kg of river sand, 223kg of cement, 153kg of water, 32kg of fly ash, 3.6kg of zinc oxide and 2.7kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.6% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Example 6
The marine concrete with the microbial corrosion effect is prepared from the following raw materials in parts by weight: 1152kg of natural limestone macadam, 845kg of river sand, 233kg of cement, 162kg of water, 30kg of fly ash, 3.6kg of zinc oxide and 4.5kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.8% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Comparative example 1
The marine concrete is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash and 2.7kg of zinc oxide.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Comparative example 2
The marine concrete is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash and 2.7kg of calcium tungstate.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Comparative example 3
The marine concrete is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stones, 831kg of river sand, 237.6kg of cement, 162kg of water and 27kg of fly ash.
The natural limestone macadam and river sand are subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, wherein the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 0.7% of the weight of the aggregate. The modification treatment method comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
Comparative example 4
The marine concrete is prepared from the following raw materials in parts by weight: 1141kg of natural limestone broken stone, 831kg of river sand, 237.6kg of cement, 162kg of water, 27kg of fly ash, 2.7kg of zinc oxide and 2.7kg of calcium tungstate.
Concrete test pieces were produced according to the formulations of examples 1 to 6 and comparative examples 1 to 4 by the following steps:
(1) and pouring the weighed aggregate, cement and fly ash into a stirrer in sequence, starting the stirrer after a cover is added, carrying out dry stirring for 20s, adding water, and continuing stirring for 3 min. Adding zinc oxide and calcium tungstate.
(2) Manually turning and stirring the discharged mixture for 2-3 times to make the mixture uniform.
(3) The concrete mixture is loaded into a human test mould at one time, the vibration of the vibration table is continued until the concrete surface is slurry and no obvious large bubbles overflow, and the vibration table is stopped immediately without over-vibration, so that the mixture is prevented from being layered and the air content is prevented from being lost.
(4) After the test piece was molded, the molded product was left standing for 24 hours in a room at (20 cm 5) ° C with a mold, and then the mold was removed. And immediately placing the test piece into a standard curing room with the temperature of 20 degrees 2 ℃ after the mold is removed, and placing the test piece at the air with the interval of 10-20 mm.
(5) Maintaining for 28d, measuring the rebound value, the compressive strength and the pH value, and measuring the results as shown in Table 1.
Table 1: the performance test result of the marine concrete provided by the invention
| Group of | Compressive strength/MPa | PH | Rebound value |
| Example 1 | 41.6 | 13.19 | 33.6 |
| Example 2 | 41.7 | 13.04 | 32.8 |
| Example 3 | 42.2 | 12.98 | 32.1 |
| Example 4 | 43.1 | 13.15 | 33.2 |
| Example 5 | 40.5 | 12.82 | 31.9 |
| Example 6 | 41.2 | 12.67 | 32.3 |
| Comparative example 1 | 35.7 | 12.84 | 30.5 |
| Comparative example 2 | 36.3 | 12.99 | 31.6 |
| Comparative example 3 | 32.0 | 12.75 | 28.61 |
| Comparative example 4 | 38.8 | 13.09 | 31.2 |
From the above test results, it is known that not only effectively inhibits the propagation of microorganisms on the surface of concrete when the concrete is doped with zinc oxide and calcium tungstate by combining the change of compressive strength and the change of resilience value, improves the strength and durability of the concrete, but also effectively relieves the reduction of the pH value of the concrete test block. After the aggregate is modified by sodium nitrite, polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, the compressive strength is also obviously improved.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (8)
1. The marine concrete with the microbial corrosion effect is characterized in that: the marine concrete is prepared from the following raw materials in parts by weight: 1800-2000 parts of aggregate, 220-240 parts of cement, 150-180 parts of water, 20-40 parts of fly ash, 2-6 parts of zinc oxide and 2-6 parts of calcium tungstate.
2. The marine concrete having a microbial corrosion effect according to claim 1, wherein: the aggregate is composed of natural macadam and river sand.
3. The marine concrete having a microbial corrosion effect according to claim 2, wherein: the weight portions of the natural macadam and the river sand are respectively 850 portions and 1200 portions.
4. The marine concrete having a microbial corrosion effect according to claim 3, wherein: the natural crushed stone is 20-40 mm natural limestone crushed stone.
5. The marine concrete having a microbial corrosion effect according to claim 3, wherein: the aggregate is also subjected to modification treatment by sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate.
6. The marine concrete having a microbial corrosion effect according to claim 5, wherein: the mass ratio of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent to the lignosulfonate is 7:15:22, and the using amount of the sodium nitrite to the polycarboxylic acid high-efficiency water reducing agent is 0.5-1% of the weight of the aggregate.
7. The marine concrete having a microbial corrosion effect according to claim 6, wherein: the modification treatment method of the aggregate comprises the following steps: mixing sodium nitrite, a polycarboxylic acid high-efficiency water reducing agent and lignosulfonate, dissolving in water, and spraying on the aggregate to fully wet the aggregate, thereby obtaining the modified recycled aggregate.
8. The method for preparing a marine concrete having a microbial corrosion effect according to any one of claims 1 to 7, wherein: the method comprises the following steps: weighing the raw materials according to the proportion, sequentially adding the aggregate, the cement and the fly ash into a stirrer, dry-stirring for 10-30s, uniformly mixing, then adding the zinc oxide and the calcium tungstate, finally adding the water, continuously stirring for 2-3min, taking out of the stirrer, and uniformly stirring to obtain the marine concrete.
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