CN114105512A - Concrete corrosion and rust inhibitor for cast-in-place pile and application thereof and cast-in-place pile - Google Patents
Concrete corrosion and rust inhibitor for cast-in-place pile and application thereof and cast-in-place pile Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 132
- 230000007797 corrosion Effects 0.000 title claims abstract description 118
- 238000005260 corrosion Methods 0.000 title claims abstract description 118
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000003112 inhibitor Substances 0.000 title claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 26
- -1 alcohol amine Chemical class 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 13
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012964 benzotriazole Substances 0.000 claims abstract description 12
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 11
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 11
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract 2
- 150000001408 amides Chemical class 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 13
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- JACMPVXHEARCBO-UHFFFAOYSA-N n-pentylpentan-1-amine Chemical compound CCCCCNCCCCC JACMPVXHEARCBO-UHFFFAOYSA-N 0.000 claims description 10
- NTDQFRAERBYXRW-UHFFFAOYSA-N 2-ethyl-n-pentylhexanamide Chemical compound CCCCCNC(=O)C(CC)CCCC NTDQFRAERBYXRW-UHFFFAOYSA-N 0.000 claims description 9
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical group CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 claims description 3
- 229940043276 diisopropanolamine Drugs 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- OBETXYAYXDNJHR-SSDOTTSWSA-M (2r)-2-ethylhexanoate Chemical compound CCCC[C@@H](CC)C([O-])=O OBETXYAYXDNJHR-SSDOTTSWSA-M 0.000 claims 1
- OBETXYAYXDNJHR-UHFFFAOYSA-N alpha-ethylcaproic acid Natural products CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000012267 brine Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 230000003487 anti-permeability effect Effects 0.000 description 4
- 239000013522 chelant Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229940005740 hexametaphosphate Drugs 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 235000014413 iron hydroxide Nutrition 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- IPJKJLXEVHOKSE-UHFFFAOYSA-L manganese dihydroxide Chemical compound [OH-].[OH-].[Mn+2] IPJKJLXEVHOKSE-UHFFFAOYSA-L 0.000 description 2
- 229910001437 manganese ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 2
- 229940007718 zinc hydroxide Drugs 0.000 description 2
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000005303 weighing 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application relates to the field of preparation of cast-in-place piles, and particularly discloses a concrete corrosion and rust inhibitor for cast-in-place piles, application thereof and a cast-in-place pile, wherein the concrete corrosion and rust inhibitor for cast-in-place piles comprises the following raw materials in parts by weight: the composite material comprises the following raw materials in parts by weight: 20-50 parts of kaolin, 35-55 parts of silica fume, 20-35 parts of phosphated slag, 20-60 parts of N-amyl-2-ethyl hexanamide, 15-30 parts of solid alcohol amine, 10-25 parts of sodium hexametaphosphate, 2-6 parts of water-soluble benzotriazole and 1.5-4.5 parts of water reducing agent; the concrete corrosion and rust inhibitor for the cast-in-place pile has better corrosion and rust resistance and is green and environment-friendly.
Description
Technical Field
The application relates to the field of preparation of cast-in-place piles, in particular to a concrete corrosion and rust inhibitor for cast-in-place piles, application of the concrete corrosion and rust inhibitor and the cast-in-place piles.
Background
A cast-in-place pile is a pile body made of cast-in-place concrete or reinforced concrete, which is commonly used in underground engineering construction. The cast-in-place pile is easy to contact with underground water or easy-to-dissolve salt and the like in underground engineering, so that concrete on the cast-in-place pile is easier to corrode compared with concrete applied to other building engineering, particularly, the corrosion of sulfate can cause the expansion deformation of the concrete and the reduction of mechanical properties such as strength and rigidity, and the bearing capacity of the structure can be reduced due to the corrosion of reinforcing steel bars, so that the structural safety of the cast-in-place pile is reduced.
At present, corrosion of reinforcing steel bars is reduced by adding an anticorrosion rust inhibitor, and the main function of the anticorrosion rust inhibitor is not to prevent harmful ions such as chloride ions in the environment from entering concrete, but to inhibit, delay and prevent the electrochemical process of reinforcing steel bar corrosion, which is shown in delaying the rusting time of the reinforcing steel bars and slowing down the corrosion development speed of the reinforcing steel bars, so that the purposes of protecting the reinforcing steel bars and improving the durability of the concrete are achieved.
The corrosion and rust inhibitor is generally divided into an anode rust inhibitor and a cathode rust inhibitor, wherein the nitrite rust inhibitor in the anode rust inhibitor is most widely applied, and the nitrite rust inhibitor can accelerate the corrosion of steel bars and is harmful to human bodies and the environment when the dosage of the nitrite rust inhibitor is insufficient; the usage amount of the cathode type rust inhibitor is often larger, the production cost is increased, and the corrosion resistance and rust resistance of the cathode type rust inhibitor are poorer.
In view of the above-mentioned related technologies, the inventors consider that the existing corrosion and rust inhibitor has poor corrosion and rust resistance and is not environment-friendly.
Disclosure of Invention
In order to provide a better, green and environment-friendly corrosion and rust inhibitor of corrosion and rust prevention performance, the application provides a concrete corrosion and rust inhibitor for a cast-in-place pile, application thereof and a cast-in-place pile.
In a first aspect, the application provides a concrete corrosion and rust inhibitor for a cast-in-place pile, which adopts the following technical scheme:
the concrete corrosion and rust inhibitor for the cast-in-place pile comprises the following raw materials in parts by weight: 20-50 parts of kaolin, 35-55 parts of silica fume, 20-35 parts of phosphated slag, 20-60 parts of N-amyl-2-ethyl caproamide, 15-30 parts of solid alcohol amine, 10-25 parts of sodium hexametaphosphate, 2-6 parts of water-soluble benzotriazole and 1.5-4.5 parts of water reducing agent.
By adopting the technical scheme, the concrete corrosion and rust inhibitor for the cast-in-place pile is prepared by firstly preparing N-pentyl-2-ethylhexanamide from dipentylamine, 2-ethyl acetic acid and water, then blending silica fume, phosphated slag, N-pentyl-2-ethylhexanamide, alcohol amine, ammonium hexametaphosphate and other auxiliary materials to prepare the concrete corrosion and rust inhibitor for the cast-in-place pile, and then applying the concrete corrosion and rust inhibitor to concrete, so that the corrosion and rust resistance of the concrete is effectively improved. The average particle sizes of the silica fume and the kaolin are smaller, and micropores in the concrete can be filled, so that chloride ions and sulfate ions can be effectively prevented from entering the interior of the concrete to damage a concrete structure, corrode a steel bar and improve the impermeability and the mechanical strength of the concrete; the phosphated slag is an industrial treatment waste slag, contains iron, zinc, manganese elements and phosphate, wherein iron ions, zinc ions, manganese ions and the like can be hydrated with alkaline concrete to generate iron hydroxide, zinc hydroxide and manganese hydroxide particles in situ, so that the compactness of the concrete is improved. The phosphate is a cathode rust inhibitor, and can form a layer of compact protective film on the cathode area on the surface of the reinforcing steel bar by adsorbing the reinforcing steel bar, so that the reinforcing steel bar is prevented from being corroded, and the corrosion resistance and rust resistance of the concrete are improved; the functional groups in the N-amyl-2-ethylhexanamide, the solid alcohol amine and the sodium hexametaphosphate can be chelated with iron to form a five-membered or six-membered chelate ring, and the five-membered or six-membered chelate ring is adsorbed on the surface of the steel bar to form a layer of compact passive film to isolate the erosion of an erosion medium.
Preferably, the concrete corrosion and rust inhibitor for the cast-in-place pile comprises the following raw materials in parts by weight: 30-45 parts of kaolin, 40-50 parts of silica fume, 25-30 parts of phosphated slag, 35-45 parts of N-amyl-2-ethyl caproamide, 20-25 parts of solid alcohol amine, 15-20 parts of sodium hexametaphosphate, 3-4.5 parts of water-soluble benzotriazole and 2-3.5 parts of water reducing agent.
By adopting the technical scheme, the raw material consumption of the concrete corrosion and corrosion inhibitor for the cast-in-place pile is optimized, the raw material consumption of the concrete corrosion and corrosion inhibitor for the cast-in-place pile is in the range, and the prepared corrosion and corrosion inhibitor for the cast-in-place pile has better corrosion and corrosion resistance.
Preferably, the amide is prepared from diammine, 2-ethyl acetic acid and water, and the added parts by weight are as follows: 60-80 parts of diamylamine, 50-70 parts of 2-ethyl acetic acid and 120 parts of water.
By adopting the technical scheme, diamylamine, 2-ethyl acetic acid and water are prepared into amide, and the amide is used for preparing the corrosion and rust inhibitor, so that the obtained corrosion and rust inhibitor is used for concrete of a cast-in-place pile, and the corrosion and rust inhibitor has good corrosion and rust resistance.
Preferably, the solid alcohol amine is diisopropanolamine or triisopropanolamine.
By adopting the technical scheme, the solid alcohol amine has a good early strength effect, can improve the compactness of concrete, effectively compensate the dry shrinkage of the concrete, prevent or reduce the generation of harmful cracks of the dry shrinkage, improve the deep performance of sulfate, chloride ions and chemical substances of the concrete, and improve the strength of the concrete.
Preferably, the silica fume has an average particle size grade of 400-800 mesh.
By adopting the technical scheme, the prepared corrosion and rust inhibitor is used in the concrete of the cast-in-place pile by limiting the average particle size grade of silica fume, so that the impermeability grade of the concrete can reach more than P12, the compressive strength is 50.9MPa, the sulfate erosion resistance is higher than KS150, the chloride ion diffusion coefficient is reduced to 2.010-12m2And is not corroded after being soaked by brine.
In a second aspect, the present application provides a use of a concrete corrosion and rust inhibitor for a cast-in-place pile, comprising the steps of: s1, stirring and reacting dipentylamine, 2-ethyl acetic acid and water, and drying to obtain N-pentyl-2-ethyl caproamide;
s2, uniformly mixing the N-pentyl-2-ethylhexanamide obtained in the S1 with kaolin, silica fume, phosphated slag, solid alcohol amine, sodium hexametaphosphate, water-soluble benzotriazole and a water reducing agent to obtain the concrete corrosion and rust inhibitor for the cast-in-place pile;
s3, directly mixing the concrete corrosion and rust inhibitor for the cast-in-place pile obtained in the step S2 into concrete, wherein the mixing amount is 2% -4%.
By adopting the technical scheme, the concrete corrosion and rust inhibitor for the cast-in-place pile is obtained by blending the amide, the kaolin, the silica fume, the phosphated slag, the amide, the alcohol amine, the sodium hexametaphosphate, the benzotriazole and the water reducing agent, and then the corrosion and rust inhibitor is applied to concrete, so that the corrosion and rust resistance of the finally prepared concrete for the cast-in-place pile is improved.
Preferably, the corrosion and rust inhibitor used for the cast-in-place pile is any one of claims 1 to 6.
By adopting the technical scheme, the concrete corrosion and rust inhibitor for the cast-in-place pile prepared by the method is added into concrete, and the prepared cast-in-place pile has better corrosion and rust resistance.
In summary, the present application has the following beneficial effects:
1. according to the concrete corrosion and rust inhibitor for the cast-in-place pile, N-pentyl-2-ethylhexanamide is prepared by dipentylamine, 2-ethyl acetic acid and water, then the concrete corrosion and rust inhibitor for the cast-in-place pile is prepared by blending silica fume, phosphated slag, N-pentyl-2-ethylhexanamide, alcohol amine, ammonium hexametaphosphate and other auxiliary materials, and then the concrete corrosion and rust inhibitor is used in concrete, so that the corrosion and rust resistance of the concrete is effectively improved. The average particle sizes of the silica fume and the kaolin are smaller, and micropores in the concrete can be filled, so that chloride ions and sulfate ions can be effectively prevented from entering the interior of the concrete to damage a concrete structure, corrode a steel bar and improve the impermeability and the mechanical strength of the concrete; the phosphated slag is an industrial treatment waste slag, contains iron, zinc, manganese elements and phosphate, wherein iron ions, zinc ions, manganese ions and the like can be hydrated with alkaline concrete to generate iron hydroxide, zinc hydroxide and manganese hydroxide particles in situ, so that the compactness of the concrete is improved. The phosphate is a cathode rust inhibitor, and can form a layer of compact protective film on the cathode area on the surface of the reinforcing steel bar by adsorbing the reinforcing steel bar, so that the reinforcing steel bar is prevented from being corroded, and the corrosion resistance and rust resistance of the concrete are improved; the functional groups in the N-amyl-2-ethylhexanamide, the solid alcohol amine and the sodium hexametaphosphate can be chelated with iron to form a five-membered or six-membered chelate ring, and the five-membered or six-membered chelate ring is adsorbed on the surface of the steel bar to form a layer of compact passive film to isolate the erosion of an erosion medium. 2. The solid alcohol amine who adopts in this application has better early strong effect, can improve the compactedness of concrete, and the dry shrinkage of effective compensation concrete prevents or reduces the production of the harmful crackle of dry shrinkage, improves the deep performance of anti sulfate of concrete, chloride ion, chemical to the intensity of concrete has been improved.
3. The prepared corrosion and rust inhibitor is used for cast-in-place pile concrete, so that the finally obtained concrete has the anti-permeability grade of more than P12, the compressive strength of 50.9MPa, the sulfate erosion resistance of more than KS150 and the chloride ion diffusion coefficient of 2.010-12m2And is not corroded after being soaked by brine.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
Kaolin: the average granularity grade is 1250 meshes, and the manufacturer is Jinniu chemical Co., Ltd in Jinan of Jinan;
silica fume: the manufacturer is Shanghai Henhuan chemical company;
diamyl amine: the manufacturer is Tianjin Xidian chemical technology Co., Ltd;
2-ethyl acetic acid: the manufacturer is Shanghai koji chemical Co., Ltd;
diisopropanolamine: the manufacturer is Nanjing Rencan Chemicals Co., Ltd;
triisopropanolamine: the manufacturer is Shanghai Aladdin Biotechnology GmbH;
benzotriazole: the manufacturer is Shanghai Weifang Fine chemical Co., Ltd;
water reducing agent: the polycarboxylic acid high-performance water reducing agent has a pH value of 8.92, and the manufacturer is Shandong bock chemical Co.
Preparation example
Preparation examples 1 to 3
An amide of preparation examples 1 to 3, wherein the respective starting materials and the respective amounts of the starting materials are shown in Table 1, was prepared by the following steps:
weighing the raw materials according to the dosage in the table 1, then uniformly stirring the raw materials, and drying to obtain the amide.
TABLE 1 preparation examples 1-3 amides and amounts (kg) of the respective materials
| Preparation example 1 | Preparation example 2 | Preparation example 3 | |
| Diamyl amine | 60 | 70 | 80 |
| 2-Ethylacetic acid | 70 | 60 | 50 |
| Water (W) | 100 | 110 | 120 |
Examples
Examples 1 to 4
The concrete corrosion and rust inhibitor for the cast-in-place pile in the embodiments 1 to 4 has the following raw materials and the use amounts of the raw materials shown in table 2, and is prepared by the following steps:
s1, stirring and reacting dipentylamine, 2-ethyl acetic acid and water, and drying to obtain N-pentyl-2-ethyl caproamide;
and S2, uniformly mixing the N-pentyl-2-ethylhexanamide obtained in the step S1 with kaolin, silica fume, phosphated slag, solid alcohol amine, sodium hexametaphosphate, water-soluble benzotriazole and a water reducing agent to obtain the concrete corrosion and rust inhibitor for the cast-in-place pile.
Wherein the kaolin has an average particle size of 1250 mesh, the amide is from preparation example 1, the silica fume has an average particle size of 400 mesh, and the benzotriazole is water-soluble benzotriazole.
TABLE 2 materials and amounts (kg) of materials of examples 1-4
Example 5
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in example 3 in that the added amide is obtained from preparation example 2, and the rest steps are the same as those in example 3.
Example 6
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in example 3 in that the added amide is obtained from the preparation example 3, and the rest steps are the same as those in example 3.
Example 7
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in example 5 in that the addition amount of amide is 35kg, and the rest steps are the same as those in example 5.
Example 8
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in example 5 in that the addition amount of amide is 45kg, and the rest steps are the same as those in example 5.
Example 9
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in example 5 in that the addition amount of amide is 60kg, and the rest steps are the same as those in example 5.
Example 10
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 8 in that the added alcohol amine is triisopropanolamine, and the rest steps are the same as the concrete corrosion and rust inhibitor in the embodiment 8.
Example 11
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 10 in that the added silica fume has the average particle size grade of 600 meshes, and the rest steps are the same as those in the embodiment 10.
Example 12
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 10 in that the added silica fume has the average particle size grade of 800 meshes, and the rest steps are the same as those in the embodiment 10.
Comparative example
Comparative example 1
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 1 in that the addition amount of amide is 0, and the rest steps are the same as those in the embodiment 1.
Comparative example 2
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 1 in that the addition amount of alcohol amine is 0, and the rest steps are the same as those in the embodiment 1.
Comparative example 3
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 1 in that the addition amount of silica fume is 0, and the rest steps are the same as those in the embodiment 1.
Comparative example 4
The concrete corrosion and rust inhibitor for the cast-in-place pile is different from the concrete corrosion and rust inhibitor in the embodiment 1 in that the addition amount of phosphated slag is 0, and the rest steps are the same as those in the embodiment 1.
Application example
Application examples 1 to 16
The application of the concrete corrosion and rust inhibitor for the cast-in-place pile in application examples 1 to 16 comprises the following application steps:
the concrete corrosion and rust inhibitor for the cast-in-place pile prepared in the examples 1 to 12 and the comparative examples 1 to 4 is directly mixed into the concrete as powder, and the mixing amount is 3 percent.
Performance test
Detection method/test method
The concrete samples of examples 1 to 16 were tested according to the following test methods, and the test results are shown in Table 3.
And (3) anti-permeability grade: and (4) detecting according to GB/T50164-2011 concrete quality control standard to obtain the impermeability grade.
Compressive strength: and (3) making a standard test block according to GB/T50081-2019 standard of mechanical property test method of common concrete, and measuring the compressive strength of the standard test block.
Sulfate attack resistance: detection is carried out according to GB/T749-2008 'test method for resisting sulfate corrosion of cement'.
Diffusion coefficient of chloride ion: the test is carried out according to the unsteady state migration test of the concrete chloride ion migration coefficient-the chloride ion diffusion coefficient model speed experiment NTBUILD492 in GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete.
Setting time: the test is carried out according to GB/T50080-2016 Standard (Standard for Performance test methods of common concrete mixtures).
TABLE 3 test results of application examples 1 to 16
It can be seen from the detection data in table 3 that the concrete corrosion and rust inhibitor for the cast-in-place pile prepared by the method improves the corrosion and rust resistance of the concrete by adding amide, alcohol amine, silica fume and the like into the concrete corrosion and rust inhibitor for the cast-in-place pile.
The detection data of application example 3 and application examples 5-6 are combined to show that the proportion of the amide of preparation example 2 is relatively good, and after the amide prepared by preparation example 2 is added into the concrete corrosion and rust inhibitor for the cast-in-place pile, the prepared concrete has good compressive strength, low chloride ion diffusion coefficient and sulfate corrosion resistance of KS150, and is free from corrosion after being soaked in salt water, so that the corrosion and rust resistance of the concrete is enhanced.
By combining the detection data of application examples 5 and 7-9, the corrosion and rust resistance of the prepared concrete can be improved by adding the amide into the concrete corrosion and rust inhibitor for the cast-in-place pile, and when the addition of the amide is 45kg, the anti-permeability grade of the prepared concrete can reach P12, the compressive strength is 50.3MPa, the sulfate corrosion resistance is higher than KS150, and the chloride ion diffusion coefficient is reduced to 2.110-12m2And is not corroded after being soaked by brine. And the detection data of the application example 13 show that the amide can effectively enhance the corrosion and rust resistance of the concrete corrosion and rust inhibitor for the cast-in-place pile.
By combining the detection data of application examples 9-10 and application example 14, the corrosion and rust resistance of the prepared concrete can be improved by adding the amide into the concrete corrosion and rust inhibitor for the cast-in-place pile. When the added alcohol amine is triisopropanolamine, the prepared concrete corrosion and rust inhibitor for the cast-in-place pile is applied to concrete, the impermeability grade of the prepared concrete can reach more than P12, the compressive strength is 50.5MPa, the sulfate erosion resistance is greater than KS150, and the chloride ion diffusion coefficient is reduced to 2.110-12m2And is not corroded after being soaked by brine.
The detection data of application example 10 and application examples 11-12 are combined to show that the larger the average particle size grade of the silica fume is, the better the corrosion and rust resistance of the prepared concrete corrosion and rust inhibitor for the cast-in-place pile is. When the average particle size of the silica fume is gradedWhen the grain size is 800 meshes, the anti-permeability grade of the prepared concrete can reach more than P12, the compressive strength is 50.9MPa, the sulfate erosion resistance is more than KS150, and the chloride ion diffusion coefficient is reduced to 2.010-12m2And is not corroded after being soaked by brine.
And the detection data of the application examples 15-16 are combined, so that when the addition amount of one of the silica fume and the phosphated slag is 0, the finally measured impermeability, compressive strength, sulfate corrosion resistance, chloride ion diffusion coefficient and salt water immersion resistance of the concrete are all reduced, which indicates that the silica fume and the phosphated slag can enhance the corrosion and rust resistance of the concrete corrosion and rust inhibitor for the cast-in-place pile.
The present embodiment is only for explaining the present application, and it is not limited to the present application, 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 application.
Claims (8)
1. A concrete corrosion and rust inhibitor for cast-in-place piles is characterized in that: the composite material comprises the following raw materials in parts by weight: 20-50 parts of kaolin, 35-55 parts of silica fume, 20-35 parts of phosphated slag, 20-60 parts of N-amyl-2-ethyl caproamide, 15-30 parts of solid alcohol amine, 10-25 parts of sodium hexametaphosphate, 2-6 parts of water-soluble benzotriazole and 1.5-4.5 parts of water reducing agent.
2. The concrete corrosion and rust inhibitor for the cast-in-place pile of claim 1, which is characterized in that: the concrete corrosion and rust inhibitor for the cast-in-place pile comprises the following raw materials in parts by weight: 30-45 parts of kaolin, 40-50 parts of silica fume, 25-30 parts of phosphated slag, 35-45 parts of N-amyl-2-ethyl caproamide, 20-25 parts of solid alcohol amine, 15-20 parts of sodium hexametaphosphate, 3-4.5 parts of water-soluble benzotriazole and 2-3.5 parts of water reducing agent.
3. The concrete corrosion and rust inhibitor for the cast-in-place pile of claim 1, which is characterized in that: the amide is prepared from diamyl, 2-ethyl hexanoic acid and water, and is added in the following parts by weight: 60-80 parts of diamylamine, 50-70 parts of 2-ethyl acetic acid and 120 parts of water.
4. The concrete corrosion and rust inhibitor for the cast-in-place pile of claim 1, which is characterized in that: the solid alcohol amine is diisopropanolamine or triisopropanolamine.
5. The concrete corrosion and rust inhibitor for the cast-in-place pile of claim 1, which is characterized in that: the average particle size grade of the silica fume is 400-800 meshes.
6. The concrete corrosion and rust inhibitor for the cast-in-place pile of claim 1, which is characterized in that: the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
7. The use of the concrete corrosion and rust inhibitor for cast-in-place piles as claimed in any one of claims 1 to 6, wherein: which comprises the following steps:
s1, stirring and reacting dipentylamine, 2-ethyl acetic acid and water, and drying to obtain N-pentyl-2-ethyl caproamide;
s2, uniformly mixing the N-pentyl-2-ethylhexanamide obtained in the S1 with kaolin, silica fume, phosphated slag, solid alcohol amine, sodium hexametaphosphate, water-soluble benzotriazole and a water reducing agent to obtain the concrete corrosion and rust inhibitor for the cast-in-place pile;
s3, directly mixing the concrete corrosion and rust inhibitor for the cast-in-place pile obtained in the step S2 into concrete, wherein the mixing amount is 2% -4%.
8. A bored concrete pile, characterized by: the corrosion and rust inhibitor for the cast-in-place pile is any one of claims 1 to 6.
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Application publication date: 20220301 |