CN115304323B - Conductive mortar and preparation method and application thereof - Google Patents

Conductive mortar and preparation method and application thereof Download PDF

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CN115304323B
CN115304323B CN202210862918.1A CN202210862918A CN115304323B CN 115304323 B CN115304323 B CN 115304323B CN 202210862918 A CN202210862918 A CN 202210862918A CN 115304323 B CN115304323 B CN 115304323B
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sacrificial anode
mortar
conductive
cement
gel
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CN115304323A (en
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陈昊翔
张东方
赵娟
范志宏
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CCCC Fourth Harbor Engineering Institute Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/12—Electrodes characterised by the material
    • 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
    • C04B2111/90—Electrical properties
    • C04B2111/94—Electrically conducting materials
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The invention relates to conductive mortar, a preparation method and application thereof, and relates to the technical field of reinforced concrete structure corrosion and protection. The conductive mortar comprises cement, quartz sand, water, a sacrificial anode activator and an expanding agent; the weight ratio of the quartz sand to the cement is (2.5-4): 1, cement and water in a weight ratio of 1: (0.50 to 0.70); the weight part ratio of the sum of the cement and the quartz sand to the sacrificial anode activator is 100: (2-5), the weight ratio of cement to expanding agent is 100: (8-15). The conductive mortar has the advantages of strong internal binding power, easy molding, small resistivity, promotion of internal ion transmission, small porosity and high ion permeation resistance, so that the prepared sacrificial anode mortar has good electrochemical activity, the electric connection of metal and a sacrificial anode can be realized without welding wires on the surface of the metal, and the long-term cathode protection effect on the surface of the metal can be realized.

Description

Conductive mortar and preparation method and application thereof
Technical Field
The invention relates to the technical field of reinforced concrete structure corrosion and protection, in particular to conductive mortar and a preparation method and application thereof.
Background
As a novel corrosion-resistant steel bar, the epoxy-coated steel bar has wide application in important overseas engineering at home and abroad due to excellent chloride ion resistance. However, according to the long-term tracking detection result, the micro defects of micropores, damages, scratches and the like are very easy to occur on the surface of the coating due to the on-site carrying, processing, binding and vibrating actions in the construction process of the epoxy coating steel bar, so that corrosion is caused in advance in the service process of the steel bar, and the theoretical design service life of the epoxy coating steel bar cannot be achieved.
Therefore, how to repair the epoxy steel bars corroded at the damaged parts in the concrete is important to ensure the service life of the structure in the service period. However, the preparation method of the sacrificial anode conductive mortar in the prior art has the following defects and inconveniences in the use process:
(1) The electric connection between the sacrificial anode and the concrete is realized by welding or binding wires on the surface of the steel bar, and the method is troublesome to operate, consumes time and consumes labor in the field use process;
(2) After mortar is allocated on a construction site, the concrete structure is filled manually, so that the operation is inconvenient and the efficiency is low;
(3) The internal structure of the sacrificial anode mortar is loose in the use process because the sacrificial anode is gradually dissolved in the use process, so that the internal resistance of the mortar is increased and even the mortar cannot function;
(4) The existing concrete structure and the repair mortar are not considered to have a certain shrinkage expansion difference, and the repair mortar is possibly invalid and falls off due to the poor binding force between the existing concrete structure and the repair mortar;
(5) Meanwhile, when the mortar is acted on common steel bars, the provided cathodic protection effect of the sacrificial anode is easily influenced by stray current of other surrounding steel bars due to small resistance among the steel bars, so that the actual protection life of the sacrificial anode is easily caused to be less than the theoretical design year requirement.
Disclosure of Invention
Aiming at the technical problems, the invention provides conductive mortar, which comprises the following raw materials: cement, quartz sand, water, a sacrificial anode activator and an expanding agent;
the weight ratio of the quartz sand to the cement is (2.5-4): 1, the weight ratio of the cement to the water is 1: (0.50 to 0.70);
the weight part ratio of the sum of the cement and the quartz sand to the sacrificial anode activator is 100: (2-5), wherein the weight ratio of the cement to the expanding agent is 100: (8-15).
The conductive mortar prepared by adopting the quartz sand, cement and water in the proportion has strong internal cohesive force, is easy to mold, has smaller resistivity, promotes internal ion transmission, has smaller porosity and higher ion permeation resistance, and further has better electrochemical activity.
In one embodiment, the conductive mortar comprises the following raw materials in parts by weight:
Figure BDA0003757737580000021
in one embodiment, the conductive mortar comprises the following raw materials in parts by weight:
Figure BDA0003757737580000022
because the mortar has poor internal binding force and is difficult to form due to the excessively low or excessively high mortar ratio, the mortar has the mortar-sand ratio (namely the weight ratio of cement to sand) of 0.25-0.40; the lower water-cement ratio (namely, the weight ratio of water to cement) can lead to the higher resistivity of the mortar and influence the internal ion transmission, thereby influencing the electrochemical activity of the sacrificial anode mortar, and the higher water-cement ratio can lead to the overlarge porosity of the conductive mortar and lead to the low ion permeation resistance of the conductive mortar, so that the water-cement ratio in the conductive mortar is 0.50-0.70. If the doping amount of the sacrificial anode activator is too low, the resistivity of the conductive mortar is higher, the doping amount is too high, bromine ions easily permeate into the metal surface, and the metal corrosion is promoted, so that adverse effects are generated; meanwhile, the expansion effect cannot be achieved due to the fact that the content of the expanding agent is too low, the stress in the conductive mortar is too high due to the fact that the content of the expanding agent is too high, and then the conductive mortar is cracked.
In one embodiment, the sacrificial anode activator comprises at least 1 of the following materials: lithium bromide, lithium chloride or lithium nitrate;
the expanding agent comprises at least 2 of the following raw materials: low activity magnesium oxide, calcium oxide or calcium sulfoaluminate; the iodine absorption value measured by the low-activity magnesium oxide is 20-40 mg/g;
the cement comprises at least 1 of the following raw materials: portland cement and Portland cement; the grade of the Portland cement is 42.5 or 52.5, and the grade of the ordinary Portland cement is 42.5 or 52.5.
The sacrificial anode activator can ensure that the surface of the sacrificial anode mortar prepared by the conductive mortar is always in an activated state, can continuously react and dissolve and emit current, and is also used as a main ion conductive medium in the mortar; the calcium oxide or calcium sulfoaluminate in the expanding agent acts on the early stage of mortar hydration, so that the cohesive force between the mortar and the existing concrete structure within days after filling can be ensured, and the low-activity magnesium oxide can act on the mortar for a long time, and the main effect of the low-activity magnesium oxide is to make up the problem of the increase of the contact resistance between the inside of the mortar and the sacrificial anode caused by the volume loss after the sacrificial anode is consumed; the specific cement can ensure that the mortar has certain strength.
In one embodiment, the expanding agent comprises the following components in parts by weight (2-4): 1 or comprises the following components in parts by weight: 1 and calcium sulfoaluminate.
The invention also provides a sacrificial anode mortar, which comprises: a sacrificial anode, a gel, a conductive layer and the conductive mortar; the sacrificial anode is inserted into the conductive mortar, gel and a conductive layer are sequentially paved at one end, close to the sacrificial anode, of the conductive mortar, and an iron core of the sacrificial anode is connected with the conductive layer through a wire.
The sacrificial anode mortar prepared from the raw materials has good electrochemical activity; the gel is a high water absorption elastic material, and can ensure ion channels between metal (such as steel bars) in the concrete and the sacrificial anode mortar. The sacrificial anode mortar does not need to weld wires on the surface of the metal in the use process, and the electrical connection between the metal and the sacrificial anode mortar can be realized through the carbon fiber inside the gel and the conductive layer at the bottom layer; and the gel and the conductive layer positioned at the bottom of the sacrificial anode mortar can be compressed and deformed under the action of external force, so that the gel and the damaged part of metal can be fully contacted in the use process of the sacrificial anode mortar.
In one embodiment, the sacrificial anode mortar is cylindrical, and the ratio of the height to the diameter is more than or equal to 1; the sacrificial anode is cuboid or cylinder, and when the sacrificial anode is cuboid, the ratio of the width of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1, when the sacrificial anode is a cylinder, the ratio of the diameter of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1.
the proportion of the height to the diameter can ensure the normal operation of the sacrificial anode mortar.
In one embodiment, the ratio of the thickness of the gel layer to the height of the conductive mortar is (0.1 to 0.3): 1, the gel comprises a gel substrate, an alkali solution and an electron conducting medium;
the volume ratio of the mass of the gel base material to the alkaline solution is 80 g/L-120 g/L, and the volume of the electron conducting medium to the alkaline solution is 10 g/L-30 g/L;
the gel substrate comprises at least 1 of the following raw materials: agar, methylcellulose gel or polyacrylic acid gel; the alkali solution comprises NaOH solution, ca (OH) 2 The concentration of the alkali solution is 0.2mol/L to 0.5mol/L; the electron conducting medium comprises at least 1 of the following raw materials: carbon fiber, graphene or carbon powder.
The gel with high water absorbability can be prepared by adopting the raw materials, meanwhile, the alkali solution can play a role in repassivation of a metal activation layer in the concrete, and the electron conducting medium can increase an electron transmission channel between the sacrificial anode and the reinforcing steel bar.
In one embodiment, the sacrificial anode comprises at least 1 of the following materials: zinc alloy, magnesium alloy or aluminum alloy; the conductive layer is conductive carbon fiber cloth, flexible steel wire cloth or fiber cloth containing metal plating layers.
The invention also provides a preparation method of the sacrificial anode mortar, which comprises the following steps: pouring the conductive mortar into a mold, inserting a sacrificial anode, adding gel after the conductive mortar is solidified, and paving a conductive layer after the gel is solidified to obtain the sacrificial anode mortar.
By adopting the preparation method, the gel and the conductive layer can be laid at the bottom of the sacrificial anode mortar in sequence, which is beneficial to the subsequent contact and repair of the damaged part of the metal.
The invention also provides a method for preventing metal corrosion, which comprises the steps of paving the sacrificial anode mortar on the surface of metal, enabling the conductive layer to be in contact with the metal, and enabling the alkali solution in the gel to permeate into the surface layer of the metal.
By adopting the method, the alkali solution in the gel can permeate into the metal surface layer, so that the metal is promoted to be passivated again. The method does not need to prepare mortar on site, and only needs to repair metal by adopting sacrificial anode mortar prepared in advance.
In one embodiment, the metal is a damaged metal located within the concrete, the method comprising the steps of: drilling concrete to a metal surface layer, removing rust on the metal, filling the sacrificial anode mortar into the hole, pressing the sacrificial anode mortar to enable the cushion layer to be in contact with the damaged part of the metal, enabling gel to permeate into the damaged part of the metal, and filling gaps between the sacrificial anode mortar and the concrete by adopting sealant or glass.
Compared with the prior art, the invention has the following beneficial effects:
according to the conductive mortar, the quartz sand, the cement and the water in a specific proportion are adopted, so that the conductive mortar is high in internal adhesion, easy to form, low in resistivity, low in porosity and high in ion permeation resistance, and internal ion transmission is promoted. The sacrificial anode mortar prepared by the conductive mortar has good electrochemical activity, and in the use process, the electric connection between metal and the sacrificial anode can be realized without welding wires on the surface of the metal, and the long-term cathode protection effect on the surface of the metal can be realized.
Drawings
FIG. 1 is a cross-sectional view of a sacrificial anode slurry in an embodiment;
FIG. 2 is a diagram of an embodiment of a fabricated sacrificial anode mortar for an epoxy rebar in an example;
wherein, 1 is the iron core of sacrificial anode, 2 is the sacrificial anode, 3 is conductive mortar, 4 is gel, 5 is the wire, 6 is the conducting layer, 7 is the existing concrete structure, 8 is epoxy coating reinforcing bar, 9 is epoxy coating reinforcing bar damage department.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Definition:
low activity magnesium oxide: the active magnesium oxide can be classified into high-activity, active and low-activity magnesium oxide according to iodine absorption value, and in the present invention, the iodine absorption value of the low-activity magnesium oxide is 20-40 mg/g.
Ordinary Portland cement: according to the specification of GB175-2007, the hydraulic cementing material is prepared by grinding silicate cement clinker, 5% -20% of mixed materials and a proper amount of gypsum.
The source is as follows:
the reagents, materials and equipment used in the examples are all commercially available sources unless otherwise specified; the test methods are conventional in the art unless otherwise specified.
Examples
A conductive mortar, a sacrificial anode mortar prepared from the conductive mortar and application of the sacrificial anode mortar are provided.
1. A preparation method of the conductive mortar is shown as follows.
1. The raw materials were weighed according to the following formulation table.
TABLE 1 mixing ratio of raw materials of conductive mortar (amount of materials required for 1L conductive mortar)
Figure BDA0003757737580000041
Figure BDA0003757737580000051
Note that: the resistivity of the mortar was measured by a four-probe method.
2. Lithium bromide is dissolved in the mixing water, and is fully dissolved.
3. And (2) mixing and stirring quartz sand, cement and an expanding agent for 30-60 s, pouring the solution obtained in the step (2) and stirring for 2-3 minutes to form the conductive mortar.
2. A sacrificial anode mortar is shown in figure 1, and the preparation method of the sacrificial anode mortar is shown as follows.
1. Pouring the conductive mortar prepared in the step one into a cylindrical mold, and inserting the prepared sacrificial anode in the initial setting stage of the mortar, and completely setting the mortar after about 24 hours.
2. 10g of methylcellulose was poured into 100mL of Ca (OH) at a temperature of 70 to 95℃and a concentration of 0.3mol/L 2 The solution was stirred well and 2g of carbon fiber was poured into the solution to obtain a gel. Pouring the gel into the upper part of the sacrificial anode mortar with the sacrificial anode inserted while the gel is hot, wherein the thickness of the gel layer can be determined according to the height ratio of the sacrificial anode mortar test block, so that the height ratio of the thickness of the gel layer to the conductive mortar is (0.1-0.3): 1, in this example, a gel layer of about 2cm was laid flat on the sacrificial anode mortar. Notably, the gel should be laid after the sacrificial anode wire has been removed.
3. After the gel is solidified, a layer of conductive carbon fiber cloth is placed above the gel, and the fiber cloth is electrically connected with the lead, so that the sacrificial anode mortar is prepared.
In order to ensure the water-retaining property of the gel at the bottom of the sacrificial anode mortar and the expansion property of the mortar, the sacrificial anode mortar should be used within 7 days after the preparation.
3. And (5) a field installation process.
Because the emission current and the service life of the sacrificial anode in the sacrificial anode mortar are limited, the sacrificial anode mortar prepared in the second step is used for protecting epoxy steel bars which are locally damaged in a splash zone or an atmosphere zone, and an implementation diagram is shown in figure 2.
1. Firstly, the corrosion of the surface of the concrete is detected by a steel bar corrosion instrument, and the corrosion condition of the interior of the concrete steel bar is determined.
2. And (5) drilling the outer concrete for determining the corrosion of the inner steel bar until the steel bar surface layer is reached. Derusting the surface layer of the steel bar and flushing with fresh water.
3. Filling the prepared sacrificial anode mortar (comprising bottom gel and a conductive layer) into the drilled holes, and slowly pressing the surface of the sacrificial anode mortar to ensure that the conductive layer of the mortar bottom layer is fully contacted with the damaged part of the steel bar, and also the solution in the gel is permeated to the damaged part of the surface of the steel bar to restore the alkaline environment on the surface of the steel bar.
4. And filling gaps between the mortar and the concrete surface with sealant or glass cement on the surface of the filled sacrificial anode mortar, so as to prevent the incomplete hydration process of the sacrificial anode mortar in the early stage and the incomplete function of the expanding agent, thereby causing poor contact between the reinforcing steel bars and the surface of the conductive layer. After filling, the mortar internal expanding agent plays a role within a few days, and can be tightly adhered to the existing concrete structure.
Comparative example
The raw materials were weighed according to the following formulation table.
TABLE 2 mixing ratio of raw materials of conductive mortar (amount of materials required for 1L conductive mortar)
Figure BDA0003757737580000052
Figure BDA0003757737580000061
Note that: the resistivity of the mortar was measured by a four-probe method.
In the comparative example, the resistivity of the conductive mortar 1 and the conductive mortar 2 is larger than 1500Ω & cm, and the requirements of GB/T4950-2002 on the dielectric resistivity are not met.
Experimental example
And detecting the potential change of the reinforced bar repaired by the sacrificial anode mortar of the embodiment.
The detection method comprises the following steps: JTS/T236-2019 water transport engineering concrete test detection technical specifications.
The results of the detection are shown in the following table.
TABLE 3 potential variation of reinforcing bars repaired with sacrificial anode mortar of examples
Figure BDA0003757737580000062
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (9)

1. A sacrificial anode slurry, characterized in that the sacrificial anode slurry comprises: sacrificial anode, gel, conductive layer and conductive mortar; the sacrificial anode is inserted into the conductive mortar, gel and a conductive layer are sequentially paved at one end of the conductive mortar, which is close to the sacrificial anode, and an iron core of the sacrificial anode is connected with the conductive layer through a wire;
the conductive mortar comprises the following raw materials: cement, quartz sand, water, a sacrificial anode activator and an expanding agent;
the weight ratio of the quartz sand to the cement is (2.5-4): 1, the weight ratio of the cement to the water is 1: (0.50 to 0.70);
the weight part ratio of the sum of the cement and the quartz sand to the sacrificial anode activator is 100: (2-5), wherein the weight ratio of the cement to the expanding agent is 100: (8-15);
the gel comprises a gel substrate, an alkali solution and an electron conducting medium;
the volume ratio of the mass of the gel base material to the volume of the alkali solution is 80 g/L-120 g/L, and the volume of the electron conducting medium mass to the volume of the alkali solution is 10 g/L-30 g/L; the gel substrate comprises at least 1 of the following raw materials: agar, methylcellulose gel or polyacrylic acid gel; the electron conducting medium comprises at least 1 of the following raw materials: carbon fiber, graphene or carbon powder.
2. The sacrificial anode mortar of claim 1, wherein the conductive mortar comprises the following raw materials in parts by weight:
2.5-4 parts of quartz sand
Cement 1 part
0.50 to 0.70 part of water
0.08-0.25 part of sacrificial anode activator
0.08-0.15 parts of an expanding agent.
3. The sacrificial anode mortar of any one of claims 1-2, wherein the sacrificial anode activator comprises at least 1 of the following raw materials: lithium bromide, lithium chloride or lithium nitrate;
the expanding agent comprises at least 2 of the following raw materials: low activity magnesium oxide, calcium oxide or calcium sulfoaluminate; the iodine absorption value measured by the low-activity magnesium oxide is 20-40 mg/g;
the cement comprises at least 1 of the following raw materials: portland cement and Portland cement; the grade of the Portland cement is 42.5 or 52.5, and the grade of the ordinary Portland cement is 42.5 or 52.5.
4. The sacrificial anode mortar of claim 3, wherein the expanding agent comprises (2-4) by weight: 1 or comprises the following components in parts by weight: 1 and calcium sulfoaluminate.
5. The sacrificial anode mortar of claim 1, wherein the sacrificial anode mortar is cylindrical in shape and has a height to diameter ratio of 1 or more; the sacrificial anode is cuboid or cylinder, and when the sacrificial anode is cuboid, the ratio of the width of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1, when the sacrificial anode is a cylinder, the ratio of the diameter of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1.
6. the sacrificial anode mortar of claim 1, wherein the ratio of the thickness of the gel lay to the height of the conductive mortar is (0.1-0.3): 1, a step of;
the alkali solution comprises NaOH solution, ca (OH) 2 The concentration of the alkali solution is 0.2 mol/L-0.5 mol/L.
7. The sacrificial anode mortar of claim 1, wherein the sacrificial anode comprises at least 1 of the following materials: zinc alloy, magnesium alloy or aluminum alloy; the conductive layer is conductive carbon fiber cloth, flexible steel wire cloth or fiber cloth containing metal plating layers.
8. The method for preparing the sacrificial anode mortar as claimed in claims 1 to 7, comprising the steps of: pouring the conductive mortar into a mold, inserting a sacrificial anode, adding gel after the conductive mortar is solidified, and paving a conductive layer after the gel is solidified to obtain the sacrificial anode mortar.
9. A method of preventing corrosion of a metal, comprising the steps of: the sacrificial anode mortar of claims 1-7 is applied to the surface of a metal, the conductive layer is contacted with the metal, and the alkali solution in the gel is permeated to the surface layer of the metal.
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WO2018169495A1 (en) * 2017-03-16 2018-09-20 Pinai Mungsantisuk Sacrificial anode for steel reinforcement in concrete
CN108878796A (en) * 2017-05-16 2018-11-23 天津大学 Graphene modified conductive polymer gel and its preparation method and application
CN109678414A (en) * 2018-08-31 2019-04-26 南京优邦加能新材料科技有限公司 A kind of porous mortar of flush type composite sacrificial anode and preparation method thereof
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