CN114315206A - Reinforced concrete anti-corrosion additive and preparation method thereof - Google Patents
Reinforced concrete anti-corrosion additive and preparation method thereof Download PDFInfo
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Abstract
The invention provides a reinforced concrete anticorrosion additive and a preparation method thereof. The concrete additive comprises the following components in parts by mass: 20-30 parts of an early strength agent, 20-40 parts of an expanding agent and 30-60 parts of a rust inhibitor. The invention is mainly applied to coastal building engineering reinforced concrete, has stable quality, excellent performance and better compatibility with various cements, the cracking resistance of the concrete is obvious when the reinforced concrete is poured in a corrosive environment, and simultaneously, the invention has double functions of sulfate erosion resistance and chloride ion erosion resistance, and obviously improves the durability and service life of the reinforced concrete in the coastal corrosive environment.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to a reinforced concrete additive with functions of increasing the volume stability and corrosion resistance of concrete and a preparation method thereof.
Background
The topography of coastal areas is complicated, and the temperature difference and humidity change range is large. The coastal beach area is large, and the coastal beach area comprises high saline-alkali water areas such as a solarization pool and a seawater culture pool; the method also comprises low saline-alkali soil and water areas such as farmlands, freshwater culture ponds and the like. According to the environmental action grade division method in the concrete structure durability design specification (GB/T50476-. The problems of concrete corrosion caused by saline-alkali corrosion of reinforced concrete and reinforcement corrosion caused by rust expansion are one of the main problems facing the design of the durability of the ocean engineering structure.
The early-stage construction of coastal areas has been carried out, the reinforced concrete generally has severe damage phenomena such as spalling, falling, steel bar corrosion and even rust breaking in the service period, and the key of sustainable development of coastal reinforced concrete buildings is to improve the quality of coastal buildings, prolong the service life of the engineering and reduce the maintenance and reconstruction cost. At present, in order to improve the durability of reinforced concrete in a saline-alkali environment and reduce the erosion damage of harmful ions to the reinforced concrete, a plurality of standard regulations are provided, particularly, a plurality of regulations for improving corrosion resistance measures of coastal reinforced concrete are provided by a transportation department, and mandatory industry standards of Water transportation engineering concrete construction Standard (JTS202-2011) and Harbour engineering high-performance concrete quality control Standard (JTS257-2-2012) are issued by the transportation department, such as 4-22 days in 2012 and 7-19 days in 2012. At present, buildings constructed in coastal saline-alkali environments mostly use high-performance concrete, and cementing materials in the high-performance concrete mainly comprise portland cement, granulated blast furnace slag powder and fly ash. The maximum mixing amount of granulated blast furnace slag in the cementing material of high-performance concrete in seawater environment in the concrete construction Specification for Water transportation engineering (JTS202-2011) chapter 5 is controlled to be 50-80%, and simultaneously, 2-4% of silica fume is recommended to be mixed when granulated blast furnace slag powder and fly ash are mixed. In chapter 3 of the harbour engineering high-performance concrete quality control standard (JTS257-2-2012), the mixing amount of granulated blast furnace slag powder in a mineral admixture in the composition of the high-performance concrete cementing material is 40-80%. Research experiments on high-performance concrete in recent years show that after a large amount of granulated blast furnace slag powder is doped into a cementing material, the drying shrinkage of the concrete is increased by about 10% -20% compared with that of the concrete without the slag powder, so that the cracking risk of the concrete is obviously increased, and if the concrete cracks in a saline-alkali environment, corrosive ions quickly reach the interior of the reinforced concrete through the cracks, and the corrosion damage of the reinforced concrete is accelerated.
Therefore, aiming at the problems of corrosion prevention of reinforced concrete buildings in saline-alkali rings in coastal areas at present, the standard regulation cannot be complied with by one, and a lot of work is needed in the aspect of improving the quality of coastal reinforced concrete.
Disclosure of Invention
Aiming at the problem that the reinforced concrete used in the prior saline-alkali environment is easy to crack so as to cause insufficient anticorrosion measures, the invention aims to provide a concrete additive with the functions of increasing the volume stability and preventing corrosion of the reinforced concrete and a preparation method thereof.
In order to achieve the aim, the invention provides a reinforced concrete anticorrosion additive which comprises the following components in parts by mass: 20-30 parts of an early strength agent, 20-40 parts of an expanding agent and 30-60 parts of a rust inhibitor.
Preferably, the early strength agent comprises the following components in parts by mass: 25-35 parts of free humic acid with the mass fraction of 42%, 1-4 parts of sulfuric acid with the mass fraction of 85%, 12-18 parts of water, 12-22 parts of triethanolamine and 30-40 parts of I-grade fly ash.
Preferably, the early strength agent comprises the following components in parts by mass: 30-35 parts of free humic acid with the mass fraction of 42%, 2-3 parts of sulfuric acid with the mass fraction of 85%, 14-16 parts of water, 14-18 parts of triethanolamine and 34-38 parts of I-grade fly ash.
Preferably, the expanding agent comprises the following components in parts by mass: 20-30 parts of kaolin, 20-30 parts of alunite, 25-35 parts of flint clay and 25-35 parts of anhydrite.
Preferably, the expanding agent comprises the following components in parts by mass: 20-25 parts of kaolin, 20-25 parts of alunite, 25-30 parts of flint clay and 25-30 parts of anhydrite.
Preferably, the rust inhibitor comprises the following components in parts by mass: 20-30 parts of calcium nitrite, 1-4 parts of sodium hexametaphosphate, 10-20 parts of sodium benzoate and 55-65 parts of S105-grade mineral powder.
Preferably, the rust inhibitor comprises the following components in parts by mass: 20-25 parts of calcium nitrite, 1-2 parts of sodium hexametaphosphate, 10-15 parts of sodium benzoate and 55-60 parts of S105-grade mineral powder.
The invention also provides a preparation method of the reinforced concrete anticorrosion additive, which comprises the following steps: and uniformly mixing the early strength agent, the expanding agent and the rust inhibitor to obtain the additive.
Preferably, the preparation method of the early strength agent comprises the following steps:
crushing free humic acid to a fineness of 60-100 meshes, adding sulfuric acid and water, fully stirring and reacting for 4-6 hours, and standing and cooling after the reaction is finished;
dehydrating and drying the obtained product at the drying temperature of 40-60 ℃;
and (3) uniformly mixing the dried product with the fly ash and the triethanolamine to obtain the early strength agent.
Preferably, the preparation method of the swelling agent comprises the following steps:
calcining flint clay for 6-8 h at 800-900 ℃, cooling to room temperature after calcining, and grinding by using a grinding machine until the specific surface area is more than 300m2/kg；
Calcining kaolin at 700-800 ℃ for 8-10 h, cooling to room temperature after calcination, and grinding by using a pulverizer until the specific surface area is more than 300m2/kg；
Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 300m2/kg；
Uniformly mixing the ground flint clay, kaolin, alunite and anhydrite to obtain the expanding agent.
Compared with the prior art, the invention has the following beneficial effects:
1. the steel bar reinforced concrete building block is mainly applied to coastal reinforced concrete buildings, and has stable quality and excellent performance;
2. the cement has good compatibility with various cements, can obviously reduce the shrinkage value of the concrete, has stable expansion process, does not generate uneven expansion, and reduces the cracking of the concrete;
3. the reinforced concrete poured by the product in a corrosive environment has double functions of resisting sulfate corrosion and resisting chloride ion corrosion.
4. The strength of the concrete poured by the product is improved by 4-6 MPa in 3 days under the condition of a large amount of admixture, and early cracks are effectively reduced;
5. the concrete prepared by the product has good cohesiveness and excellent appearance quality.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
1. Preparation of early strength agent
1) 30 parts of free humic acid (42%), 2 parts of sulfuric acid (85%), 18 parts of water, 20 parts of triethanolamine and 30 parts of I-grade fly ash are weighed.
2) Crushing free humic acid to 100 meshes, adding sulfuric acid and water, fully stirring and reacting for 4 hours, and standing and cooling after the reaction is finished;
3) dehydrating and drying the product obtained in the step 2 at the drying temperature of 50 ℃, and simultaneously drying the fly ash;
4) and (3) uniformly mixing the dried product obtained in the step (3) with the fly ash and the triethanolamine to obtain the early strength agent.
2. Preparation of swelling agent
1) Weighing 25 parts of kaolin, 25 parts of alunite, 30 parts of flint clay and 20 parts of anhydrite.
2) Calcining flint clay at 800 deg.C for 6 hr, cooling to room temperature, and grinding to specific surface area of 320m2/kg；
3) Calcining kaolin at 700 deg.C for 8 hr, cooling to room temperature, and grinding to specific surface area of 310m2/kg；
4) Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 320m2/kg；
5) And (3) uniformly mixing the products obtained by grinding the polymers 1, 2 and 3 to obtain the expanding agent.
3. Preparation of rust inhibitor
1) Weighing 25 parts of calcium nitrite, 2 parts of sodium hexametaphosphate, 15 parts of sodium benzoate and 58 parts of S105-grade mineral powder.
2) The rust inhibitor is obtained by uniformly mixing the four components.
4. Preparation of corrosion inhibiting additives
And (3) weighing 25 parts of the early strength agent, 35 parts of the expanding agent and 40 parts of the rust inhibitor in a mixing stirrer, and stirring uniformly for 5 hours continuously.
4. Test Performance
(1) The performance test of the additive disclosed in the invention is carried out according to concrete admixture (GB8076-2008) and concrete test detection technical specification of water transportation engineering (JTS/T236-2019), the concrete with the strength grade of C30 is prepared, the mixing amount of the additive is respectively 0, 8% and 12%, and the test results are shown in the following table:
TABLE 1C 30 test results for concrete Performance
Example 2
1. Preparation of early strength agent
1) Weighing 32 parts of free humic acid (42%), 3 parts of sulfuric acid (85%), 15 parts of water, 20 parts of triethanolamine and 30 parts of I-grade fly ash.
2) Crushing free humic acid to the fineness of 90 meshes, adding sulfuric acid and water, fully stirring and reacting for 4 hours, and standing and cooling after the reaction is finished;
3) dehydrating and drying the product obtained in the step 2 at the drying temperature of 55 ℃, and simultaneously drying the fly ash;
4) and (3) uniformly mixing the dried product obtained in the step (3) with the fly ash and the triethanolamine to obtain the early strength agent.
2. Preparation of swelling agent
1) 30 parts of kaolin, 20 parts of alunite, 25 parts of flint clay and 25 parts of anhydrite are weighed.
2) Calcining flint clay at 800 deg.C for 6 hr, cooling to room temperature, and grinding to specific surface area of 350m2/kg；
3) Calcining kaolin at 700 deg.C for 8 hr, cooling to room temperature, and grinding to specific surface area of 350m2/kg；
4) Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 350m2/kg；
5) And (3) uniformly mixing the products obtained by grinding the polymers 1, 2 and 3 to obtain the expanding agent.
3. Preparation of rust inhibitor
1) 30 parts of calcium nitrite, 4 parts of sodium hexametaphosphate, 10 parts of sodium benzoate and 56 parts of S105-grade mineral powder are weighed.
2) The rust inhibitor is obtained by uniformly mixing the four components.
4. Preparation of corrosion inhibiting additives
30 parts of the early strength agent, 30 parts of the expanding agent and 40 parts of the rust inhibitor are put in a mixing stirrer and stirred uniformly for 6 hours continuously.
4. Test Performance
(1) The performance test of the additive disclosed in the invention is carried out according to concrete admixture (GB8076-2008) and concrete test detection technical specification of water transportation engineering (JTS/T236-2019), the concrete with the strength grade of C30 is prepared, the mixing amount of the additive is respectively 0, 6% and 10%, and the test results are shown in the following table:
TABLE 2C 30 test results for concrete Performance
Example 3
1. Preparation of early strength agent
1) Weighing 35 parts of free humic acid (42%), 4 parts of sulfuric acid (85%), 13 parts of water, 16 parts of triethanolamine and 32 parts of I-grade fly ash.
2) Crushing free humic acid to 80-mesh fineness, adding sulfuric acid and water, fully stirring and reacting for 4 hours, and standing and cooling after the reaction is finished;
3) dehydrating and drying the product obtained in the step 2 at the drying temperature of 60 ℃, and simultaneously drying the fly ash;
4) and (3) uniformly mixing the dried product obtained in the step (3) with the fly ash and the triethanolamine to obtain the early strength agent.
2. Preparation of swelling agent
1) 30 parts of kaolin, 20 parts of alunite, 22 parts of flint clay and 28 parts of anhydrite are weighed.
2) Calcining flint clay at 800 deg.C for 6 hr, cooling to room temperature, and grinding to specific surface area of 400m2/kg；
3) Calcining kaolin at 700 deg.C for 8 hr, cooling to room temperature, and grinding to specific surface area of 400m2/kg；
4) Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 380m2/kg；
5) And (3) uniformly mixing the products obtained by grinding the polymers 1, 2 and 3 to obtain the expanding agent.
3. Preparation of rust inhibitor
1) Weighing 25 parts of calcium nitrite, 2 parts of sodium hexametaphosphate, 18 parts of sodium benzoate and 55 parts of S105-grade mineral powder.
2) The rust inhibitor is obtained by uniformly mixing the four components.
4. Preparation of corrosion inhibiting additives
And (3) weighing 25 parts of the early strength agent, 25 parts of the expanding agent and 50 parts of the rust inhibitor in a mixing stirrer, continuously stirring for 6 hours, and uniformly stirring.
4. Test Performance
(1) The performance test of the additive disclosed in the invention is carried out according to concrete admixture (GB8076-2008) and concrete test detection technical specification of water transportation engineering (JTS/T236-2019), the concrete with the strength grade of C30 is prepared, the mixing amount of the additive is respectively 0, 5% and 10%, and the test results are shown in the following table:
TABLE 3C 30 concrete Performance test results
Example 4
1. Preparation of early strength agent
1) 30 parts of free humic acid (42%), 4 parts of sulfuric acid (85%), 16 parts of water, 15 parts of triethanolamine and 35 parts of I-grade fly ash are weighed.
2) Crushing free humic acid to 100 meshes, adding sulfuric acid and water, fully stirring and reacting for 4 hours, and standing and cooling after the reaction is finished;
3) dehydrating and drying the product obtained in the step 2 at the drying temperature of 60 ℃, and simultaneously drying the fly ash;
4) and (3) uniformly mixing the dried product obtained in the step (3) with the fly ash and the triethanolamine to obtain the early strength agent.
2. Preparation of swelling agent
1) Weighing 20 parts of kaolin, 30 parts of alunite, 24 parts of flint clay and 26 parts of anhydrite.
2) Calcining flint clay at 800 deg.C for 6 hr, cooling to room temperature, and grinding to specific surface area of 350m2/kg；
3) Calcining kaolin at 700 deg.C for 8 hr, cooling to room temperature, and grinding to specific surface area of 350m2/kg；
4) Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 350m2/kg；
5) And (3) uniformly mixing the products obtained by grinding the polymers 1, 2 and 3 to obtain the expanding agent.
3. Preparation of rust inhibitor
1) Weighing 25 parts of calcium nitrite, 4 parts of sodium hexametaphosphate, 16 parts of sodium benzoate and 55 parts of S105-grade mineral powder.
2) The rust inhibitor is obtained by uniformly mixing the four components.
4. Preparation of corrosion inhibiting additives
And (3) weighing 25 parts of the early strength agent, 25 parts of the expanding agent and 50 parts of the rust inhibitor in a mixing stirrer, continuously stirring for 6 hours, and uniformly stirring.
4. Test Performance
(1) The performance test of the additive disclosed in the invention is carried out according to concrete admixture (GB8076-2008) and concrete test detection technical specification of water transportation engineering (JTS/T236-2019), the concrete with the strength grade of C30 is prepared, the mixing amount of the additive is respectively 0, 8% and 12%, and the test results are shown in the following table:
TABLE 4C 30 concrete Performance test results
And (3) data analysis: in tables 1 to 4, the results of tests on the mechanical properties, drying shrinkage, resistance to chloride and sulfate attack of concrete obtained by adding different amounts of concrete admixture to concrete having a strength grade of C30 are shown. Wherein, the 1 st row of each table is the concrete performance at the admixture addition amount of 0, i.e., the reference group.
When the addition amount of the additive is increased to about 5.0 percent, the compressive strength ratio of the concrete exceeds 120 percent, and the compressive strength ratio of the concrete in the early age (7d) is obviously greater than the compressive strength ratio of the concrete in the 28d, which indicates that the early strength is obviously increased; in the aspect of concrete shrinkage, the concrete basically is in a micro-expansion state, and the volume stability and the crack resistance are obviously improved; the permeability coefficient of chloride ions is reduced by 2-5 times, and the resistance to chloride salt corrosion is obviously improved; the sulfate erosion resistance of the standard concrete is only KS60, while the sulfate erosion resistance of the concrete added with the preservative exceeds KS90, and the sulfate erosion resistance is obviously improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The reinforced concrete anticorrosion additive is characterized by comprising the following components in parts by mass: 20-30 parts of an early strength agent, 20-40 parts of an expanding agent and 30-60 parts of a rust inhibitor.
2. The reinforced concrete anticorrosion additive of claim 1, wherein the early strength agent comprises the following components in parts by mass: 25-35 parts of free humic acid with the mass fraction of 42%, 1-4 parts of sulfuric acid with the mass fraction of 85%, 12-18 parts of water, 12-22 parts of triethanolamine and 30-40 parts of I-grade fly ash.
3. The reinforced concrete anticorrosion additive of claim 2, wherein the early strength agent comprises the following components in parts by mass: 30-35 parts of free humic acid with the mass fraction of 42%, 2-3 parts of sulfuric acid with the mass fraction of 85%, 14-16 parts of water, 14-18 parts of triethanolamine and 34-38 parts of I-grade fly ash.
4. The reinforced concrete anticorrosion additive according to claim 1, wherein the expanding agent comprises the following components in parts by mass: 20-30 parts of kaolin, 20-30 parts of alunite, 25-35 parts of flint clay and 25-35 parts of anhydrite.
5. The reinforced concrete anticorrosion additive according to claim 4, wherein the expanding agent comprises the following components in parts by mass: 20-25 parts of kaolin, 20-25 parts of alunite, 25-30 parts of flint clay and 25-30 parts of anhydrite.
6. The reinforced concrete anticorrosion additive of claim 1, wherein the rust inhibitor comprises the following components in parts by mass: 20-30 parts of calcium nitrite, 1-4 parts of sodium hexametaphosphate, 10-20 parts of sodium benzoate and 55-65 parts of S105-grade mineral powder.
7. The reinforced concrete anticorrosion additive of claim 6, wherein the rust inhibitor comprises the following components in parts by mass: 20-25 parts of calcium nitrite, 1-2 parts of sodium hexametaphosphate, 10-15 parts of sodium benzoate and 55-60 parts of S105-grade mineral powder.
8. The method of preparing a reinforced concrete anticorrosion additive as claimed in any one of claims 1 to 7, comprising: and uniformly mixing the early strength agent, the expanding agent and the rust inhibitor to obtain the additive.
9. The preparation method of claim 8, wherein the early strength agent is prepared by:
crushing free humic acid to the fineness of 60-100 meshes, adding sulfuric acid and water, fully stirring and reacting for 4-6 h, and standing and cooling after the reaction is finished;
dehydrating and drying the obtained product at the drying temperature of 40-60 ℃;
and (3) uniformly mixing the dried product with the fly ash and the triethanolamine to obtain the early strength agent.
10. The method of claim 8, wherein the swelling agent is prepared by:
calcining flint clay for 6-8 h at 800-900 ℃, cooling to room temperature after calcining, and grinding by using a grinding machine until the specific surface area is more than 300m2/kg；
Calcining kaolin at 700-800 ℃ for 8-10 h, cooling to room temperature after calcination, and grinding by using a pulverizer until the specific surface area is more than 300m2/kg；
Grinding alunite and anhydrite with a pulverizer until the specific surface area is more than 300m2/kg；
Uniformly mixing the ground flint clay, kaolin, alunite and anhydrite to obtain the expanding agent.
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| CN115321870A (en) * | 2022-08-05 | 2022-11-11 | 安徽皖科新科技发展有限公司 | Special additive for lightweight concrete and preparation method thereof |
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