CN115304306A - Concrete anti-corrosion additive and preparation method thereof - Google Patents
Concrete anti-corrosion additive and preparation method thereof Download PDFInfo
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- CN115304306A CN115304306A CN202210936208.9A CN202210936208A CN115304306A CN 115304306 A CN115304306 A CN 115304306A CN 202210936208 A CN202210936208 A CN 202210936208A CN 115304306 A CN115304306 A CN 115304306A
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- water reducing
- corrosion additive
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- 239000004567 concrete Substances 0.000 title claims abstract description 60
- 238000005260 corrosion Methods 0.000 title claims abstract description 44
- 239000000654 additive Substances 0.000 title claims abstract description 26
- 230000000996 additive effect Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011852 carbon nanoparticle Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 23
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000004021 humic acid Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000005060 rubber Substances 0.000 claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- 239000010426 asphalt Substances 0.000 claims abstract description 10
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000010000 carbonizing Methods 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001694 spray drying Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 21
- 238000012360 testing method Methods 0.000 description 33
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000005457 optimization Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000011381 foam concrete Substances 0.000 description 2
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete corrosion-resistant additive and a preparation method thereof, wherein the concrete corrosion-resistant additive comprises the following raw materials in percentage by mass: 30-35% of asphalt, 30-35% of fly ash, 20-30% of carbon nanoparticles, 2-4% of rubber powder, 1-3% of a water reducing agent, 1-3% of a stabilizing agent and water as a solvent, wherein the carbon nanoparticles are obtained by carbonizing humic acid. The concrete anti-corrosion additive provided by the invention can improve the anti-corrosion performance of the lightweight concrete, and the additive with the carbon nano-particle addition amount of 26% and the rubber powder addition amount of 2.6% is added into the lightweight concrete by exploration, so that the anti-corrosion performance of the lightweight concrete can be improved, and the structural compactness and the waterproof performance of the lightweight concrete can be improved.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete anti-corrosion admixture for lightweight concrete and a preparation method thereof.
Background
The corrosion action of various environmental factors is a key factor for reducing the durability of a reinforced concrete structure, and concrete is easily damaged by corrosion erosion, so that the improvement of the corrosion performance of the concrete needs to be emphasized;
at present, aiming at light concrete, due to the fact that a large number of fine closed air holes exist in the structure of the light concrete, the porosity and the aperture of the light concrete have certain influence on the physical, mechanical and building waterproof performance of the foam concrete, and in addition, the porous and foam structures can also influence the waterproof performance and the corrosion resistance of the foam concrete, so that the large-scale application of the light concrete is limited.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a concrete anti-corrosion admixture for lightweight concrete and a method for preparing the same.
The invention realizes the purpose through the following technical scheme:
the invention provides a concrete corrosion-resistant additive which comprises the following raw materials in percentage by mass: 30-35% of asphalt, 30-35% of fly ash, 20-30% of carbon nanoparticles, 2-4% of rubber powder, 1-3% of a water reducing agent, 1-3% of a stabilizing agent and water as a solvent, wherein the carbon nanoparticles are obtained by carbonizing humic acid.
As a further optimized scheme of the invention, the composite material comprises the following raw materials in percentage by mass: 30% of asphalt, 30% of fly ash, 26% of carbon nanoparticles, 2.6% of rubber powder, 2% of water reducing agent, 2% of stabilizing agent and water as a solvent.
As a further optimization scheme of the invention, the carbonization treatment steps specifically comprise:
(1) Mixing humic acid and NaOH solution, and carrying out ultrasonic treatment for 6 hours at the temperature of 60 ℃ to obtain sodium humate solution;
(2) Neutralizing the sodium humate solution obtained in the step (1) by using concentrated sulfuric acid to obtain a humic acid extract;
(3) And (3) continuously carbonizing the humic acid extract obtained in the step (2) and concentrated sulfuric acid at 180 ℃ for 6 hours to obtain carbide, neutralizing the carbide by using a NaOH solution, and filtering and drying the carbide subjected to neutralization treatment to obtain the carbon nano-particles.
As a further optimization scheme of the invention, the water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the polycarboxylic acid water reducing agent is 30-40%, and the water reducing rate is more than or equal to 30%.
As a further optimization scheme of the invention, the stabilizing agent is sodium lauryl sulfate.
As a further optimization scheme of the invention, the addition amount of the concrete anti-corrosion additive is 1-3% of the mass of the cementing material.
The invention also provides a preparation method of the concrete anti-corrosion additive, which comprises the steps of uniformly dispersing asphalt, fly ash, carbon nano particles, rubber powder, a water reducing agent and a stabilizing agent in water according to parts by weight, uniformly stirring, and then carrying out spray drying to obtain fixed powder, namely the concrete anti-corrosion additive.
The working principle of the invention is as follows: humic acid is used as a raw material, and is mixed with a NaOH solution, ultrasonic treatment is carried out for 6 hours at the temperature of 60 ℃ to prepare a sodium humate solution, and the sodium humate solution is neutralized by concentrated sulfuric acid to obtain a humic acid extract; adding concentrated sulfuric acid into the humic acid extract for carbonization; after the carbonization reaction of the humic acid extract and concentrated sulfuric acid is carried out for 6 hours at 180 ℃, naOH solution is utilized to neutralize carbide, the carbide after neutralization is filtered and dried, so that carbon nano particles are obtained, the carbon nano particles are used as an anti-corrosion agent component and added into concrete components, so that the additive is added into lightweight concrete, and the anti-corrosion performance of the concrete is improved.
In conclusion, the beneficial effects of the invention are as follows: the admixture special for the lightweight concrete is prepared by taking asphalt, fly ash, carbon nano-particles, rubber powder, a water reducing agent, a stabilizing agent and water as main raw materials, wherein the carbon nano-particles are obtained by carbonizing humic acid, so that the corrosion resistance of the concrete is improved when the admixture is added into the lightweight concrete, and the discovery shows that when the admixture with the addition of 26% of the carbon nano-particles and the addition of 2.6% of the rubber powder is added into the lightweight concrete, the corrosion resistance of the lightweight concrete can be improved, and the structural compactness and the waterproof performance of the lightweight concrete are improved.
Detailed Description
The present application is described in further detail below, and it should be noted that the following detailed description is provided for illustrative purposes only, and is not intended to limit the scope of the present application, which is defined by the appended claims.
Example 1
1. Materials and methods
The methods used in this example are conventional methods known to those skilled in the art unless otherwise specified, and the reagents and other materials used in this example are commercially available products unless otherwise specified.
The embodiment provides a concrete corrosion-resistant additive which comprises the following raw materials in percentage by mass: 30% of asphalt, 30% of fly ash, 24% of carbon nanoparticles, 2.6% of rubber powder, 2% of a water reducing agent, 2% of a stabilizing agent, wherein the solvent is water, the water reducing agent is a polycarboxylate water reducing agent, the solid content of the polycarboxylate water reducing agent is 30%, the water reducing rate is not less than 30%, and the stabilizing agent is sodium lauryl sulfate;
the carbon nano-particles are obtained by taking humic acid as a raw material, performing hydrothermal dissolution under a strong alkaline condition, performing carbonization treatment by using concentrated sulfuric acid, cleaning and filtering to obtain a carbide of the humic acid, and finally drying the carbide;
taking 10g of humic acid as an example, mixing the humic acid with 100ml of 2mol/L NaOH solution, carrying out ultrasonic treatment at 60 ℃ for 6 hours to obtain a sodium humate solution, and dropwise adding 10mol/L sulfuric acid by using a dropper to neutralize the obtained sodium humate solution to obtain a humic acid extract; adding 60ml of humic acid extract into 120ml of concentrated sulfuric acid with the concentration of 10mol/L for carbonization; after the carbonization reaction of the humic acid extract and concentrated sulfuric acid is carried out for 6 hours at 180 ℃, adding 5mol/L NaOH solution for neutralization treatment until the pH of the mixture is adjusted to 5-6, carrying out vacuum filtration, and drying for 24 hours at 60 ℃ to obtain the carbon nano-particles;
the preparation method of the concrete corrosion-resistant additive comprises the steps of uniformly dispersing asphalt, fly ash, carbon nano particles, rubber powder, a water reducing agent and a stabilizing agent in water according to the component proportion of the concrete corrosion-resistant additive, uniformly stirring, and then carrying out spray drying to obtain fixed powder, namely the concrete corrosion-resistant additive.
2. Verification test
The concrete selected in the verification test is LC60 lightweight high-strength concrete as an example, and the single-use proportion and the performance of the concrete are shown in table 1 (note that the doping amount of the anti-corrosion additive in the embodiment is 2% of the mass of the cementing material):
TABLE 1 Single-formula dosage ratio table of LC60 light high-strength concrete
In order to verify the influence of different rubber powder addition amounts and different carbon nanoparticle addition amounts on the performance of lightweight concrete, the component formula disclosed in example 1 is adopted, and under the condition that the other component proportions are kept to be constant, the experimental group is to mix the rubber powder according to the addition amounts of 2%, 2.6% and 4%, and the latex powder added with 2.6% is used as a control group; the second experimental group is designed by doping carbon nano-particles according to the addition amounts of 20%, 24%, 26% and 30%, and simultaneously taking commercially available carbon nano-tube particles doped with 26% as a control group, specifically referring to table 2;
TABLE 2 test design Table
Applying the test pieces in the table 2 to the lightweight concrete example, namely respectively manufacturing cubes of 100mm × 100mm × 100mm, naturally drying to obtain the test pieces, and sequentially testing the water absorption rate and the corrosion resistance of the test pieces, wherein the results are shown in the table 3;
testing water absorption, namely placing the test piece in a drying oven at (60 +/-5) DEG C for drying for 4h, cooling to room temperature in a drier, weighing, calculating the weight of each test piece, and taking the average value; putting the test piece into a constant-temperature (25 +/-5) DEG C water tank, adding water to one third of the test piece, standing for 24h, adding water to two thirds of the test piece, keeping for 24h, and finally adding water to exceed the test piece by 30mm and keeping for 24h. Taking out the test piece, wiping off surface moisture and weighing, and calculating the water absorption according to a formula:
W r ＝(m g -m 0 )/m 0 ×100％
in the formula W r Water absorption,%; m is 0 G is the dried mass of the test piece; m is g The mass of the test piece after water absorption, g.
The corrosion resistance test is carried out by referring to the compression strength ratio in JT/T1011-2006 concrete sulfate corrosion-resistant agent, wherein the corrosion solution comprises the following components: naCl 60g/L, mgSO 4 4.8g/L，MgCl 2 5.6g/L，CaSO 4 2.4g/L，KHCO 3 0.4g/L, after the sample is normally maintained for 28 days, forming a polymer film with the thickness of 300-500 mu m on the surface of the concrete product in a spraying mode, transferring the product to be tested into an erosion solution, soaking a reference product in clear water, and testing the compressive strength ratio and the compactness of the corroded 7 th and 28 th days;
TABLE 3 test results
And (4) conclusion: test group I proves that the density of a test piece can be improved by adding the rubber powder, the higher the density is, the better the strength of the test piece is, but with the improvement of the adding amount of the rubber powder, certain influence is found on the water absorption rate of a lightweight concrete test piece, the increase of the adding amount of the rubber powder enables the water absorption rate of the concrete test piece to be improved, the water absorption rate to be increased is not beneficial to the improvement of the waterproof performance of the lightweight concrete test piece, and the corrosion resistance of the test piece can also be influenced, the rubber powder is added into an additive of the lightweight concrete according to 2.6%, the shrinkage rate of the concrete can be reduced, the adding amount of the rubber powder has little influence on the compression strength ratio of the test piece, namely, the corrosion resistance of the test piece is not influenced;
in addition, the experiment group II proves that the doping of the carbon nanoparticles is beneficial to the improvement of the corrosion resistance of the lightweight concrete test piece, and in addition, when the addition amount of the carbon nanoparticles is 26%, the corrosion resistance of the test piece can be improved, in addition, the water absorption of the test piece is obviously reduced, and the improvement of the waterproof performance of the lightweight concrete test piece is facilitated.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The concrete anti-corrosion additive is characterized by comprising the following raw materials in percentage by mass: 30-35% of asphalt, 30-35% of fly ash, 20-30% of carbon nanoparticles, 2-4% of rubber powder, 1-3% of a water reducing agent, 1-3% of a stabilizing agent and water as a solvent, wherein the carbon nanoparticles are obtained by carbonizing humic acid.
2. The concrete anti-corrosion additive according to claim 1, which comprises the following raw materials in percentage by mass: 30% of asphalt, 30% of fly ash, 26% of carbon nanoparticles, 2.6% of rubber powder, 2% of water reducing agent, 2% of stabilizing agent and water as a solvent.
3. An anti-corrosion additive for concrete according to any one of claims 1-2, wherein said carbonization treatment comprises:
(1) Mixing humic acid with NaOH solution, and carrying out ultrasonic treatment for 6 hours at the temperature of 60 ℃ to obtain sodium humate solution;
(2) Neutralizing the sodium humate solution obtained in the step (1) by using concentrated sulfuric acid to obtain a humic acid extract;
(3) And (3) continuously carbonizing the humic acid extract obtained in the step (2) and concentrated sulfuric acid at 180 ℃ for 6 hours to obtain carbide, neutralizing the carbide by using a NaOH solution, and filtering and drying the carbide subjected to neutralization treatment to obtain the carbon nano-particles.
4. The concrete anti-corrosion additive according to claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the polycarboxylic acid water reducing agent is 30-40%, and the water reducing rate is not less than 30%.
5. An anti-corrosion admixture for concrete according to claim 1 wherein said stabilizer is sodium lauryl sulfate.
6. The concrete anti-corrosion additive according to claim 1, wherein the amount of the concrete anti-corrosion additive is 1-3% of the mass of the cementitious material.
7. The preparation method of the concrete anti-corrosion additive according to any one of claims 1 to 6, characterized in that asphalt, fly ash, carbon nano-particles, rubber powder, a water reducing agent and a stabilizing agent are uniformly dispersed in water according to the component proportion of the concrete anti-corrosion additive, and after being uniformly stirred, fixed powder is obtained through spray drying, namely the concrete anti-corrosion additive.
Priority Applications (1)
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| CN202210936208.9A CN115304306A (en) | 2022-08-05 | 2022-08-05 | Concrete anti-corrosion additive and preparation method thereof |
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Application publication date: 20221108 |