CN114213050B - Additive for concrete to resist sulfate corrosion and preparation method thereof - Google Patents
Additive for concrete to resist sulfate corrosion and preparation method thereof Download PDFInfo
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- CN114213050B CN114213050B CN202210022365.9A CN202210022365A CN114213050B CN 114213050 B CN114213050 B CN 114213050B CN 202210022365 A CN202210022365 A CN 202210022365A CN 114213050 B CN114213050 B CN 114213050B
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an admixture for concrete sulfate corrosion resistance and a preparation method thereof, wherein the admixture comprises, by weight, 20-23 parts of mineral powder, 10-17 parts of sodium silicate, 40-54 parts of potassium alum, 20-27 parts of silica fume, 10-17 parts of calcium hydroxide, 2-4 parts of polymeric ferric sulfate and 8-15 parts of complexing agent. The preparation method comprises the steps of weighing the raw materials according to the weight parts, and drying and sieving the raw materials respectively; drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer to stir until the raw materials are uniform; sieving the mixture after being stirred uniformly to obtain the finished product of the additive. The additive prepared by the invention can improve the long-acting corrosion resistance of concrete, so that the concrete has longer sulfate corrosion resistance.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an admixture for concrete with sulfate corrosion resistance and a preparation method thereof.
Background
Concrete is the most widely used building material in civil engineering, and the service life of concrete buildings has become an important point of attention in recent years. Sulfate corrosion damage is considered as one of the main factors causing failure damage of concrete materials, and when sulfate ions in the environment reach a certain concentration and the concrete structure does not take any protective measures, external sulfate ions easily invade the interior of the concrete, react and cause expansion, and finally cause damage of the concrete structure.
In order to inhibit sulfate corrosion of concrete, the prior art mostly adopts an external coating preservative or increases the thickness of a protective layer, but the external coating preservative cannot be used for preserving underground structures such as cast-in-place piles, continuous walls and the like, and increasing the thickness of the protective layer can increase the dead weight of the concrete structure, and correspondingly, the total cost is increased due to the fact that reinforcing bars are added in the concrete structure and the requirement on basic engineering is met. At present, some internal-doped preservatives which are internally doped into concrete appear in the market, but the gel generated by the reaction of the existing internal-doped preservatives and calcium hydroxide in the concrete mostly contains bound water, so that shrinkage is easy to occur, and the corrosion prevention function of the concrete is invalid after a period of time.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the additive for resisting the sulfate corrosion of the concrete and the preparation method thereof, so that the long-acting corrosion resistance of the concrete is improved, and the concrete has longer sulfate corrosion resistance.
In order to achieve the above purpose, one of the technical schemes adopted by the invention is as follows: the admixture for concrete with sulfate corrosion resistance comprises, by weight, 20-23 parts of mineral powder, 10-17 parts of sodium silicate, 40-54 parts of potassium alum, 20-27 parts of silica fume, 10-17 parts of calcium hydroxide, 2-4 parts of polymeric ferric sulfate and 8-15 parts of complexing agent.
The invention has the beneficial effects that:
1. mineral powder and silica fume are used as geopolymers, and sodium silicate can be used as an exciting agent for exciting the activity of the geopolymers after being dissolved in water, so that the geopolymers can generate high-strength and non-shrinkage mineral polymer material blocks; meanwhile, the expansion rate of the concrete is improved through potassium alum to compensate the shrinkage of the concrete, and cracks caused by dry shrinkage of the concrete can be reduced through the water-retaining function of the polymeric ferric sulfate, so that under the combined action of the potassium alum and the polymeric ferric sulfate, the cracks at the early stage and the later stage of the concrete can be effectively reduced, and the performance of the concrete for resisting sulfate corrosion is improved by being matched with mineral polymeric material blocks;
2. on the basis of geopolymer excitation, sodium silicate and calcium hydroxide are added to react to generate hydrated calcium silicate so as to fill micro gaps in the concrete, so that the compactness of the concrete is further improved, and the sulfate corrosion resistance of the concrete is further improved;
3. complexing calcium ions in calcium hydroxide in water environment by using sodium silicate as a precipitator, complexing the complexing ions into free complex ions in water environment, and migrating the complex ions in water environment by means of concentration difference, wherein the complex ions react with the precipitator sodium silicate or unhydrated silicate ions in concrete to generate hydrated calcium silicate to block cracks generated by the concrete, and the complexing agent after losing the calcium ions continues to complex the calcium ions and repeatedly starts, in the process, because a large amount of calcium hydroxide and unhydrated silicate ions are contained in the concrete, the complexing agent is not consumed, and the process can be regarded as semi-permanent, so that the self-healing capacity of the concrete can be effectively improved;
4. because the calcium hydroxide is generated in the hydration process of the concrete, the calcium hydroxide is directly added into the additive, so that the complexing agent can complex calcium ions when the complexing agent is initially stirred with the concrete, preparation is made for the reaction of the precipitant and the calcium ions, and the corrosion resistance of the concrete to the reinforcing steel bar can be improved by adding the calcium hydroxide into the concrete.
Further, the complexing agent comprises 5-9 parts by weight of glycine, 2-4 parts by weight of citrate and 1-2 parts by weight of tetrasodium ethylenediamine tetraacetate. The complexation effect of the tetra-sodium ethylenediamine tetraacetate is the best, and the tetra-sodium ethylenediamine tetraacetate is used as a main complexing agent; the citrate can be used as a complexing agent, and meanwhile, the plasticity of the concrete can be increased, and the cracking risk of the concrete can be reduced; glycine can be used as a complexing agent and can reduce the activity of chloride ions, so that the chlorine salt resistance of concrete is further enhanced.
Further, the additive comprises 23 parts of mineral powder, 17 parts of sodium silicate, 40 parts of potassium alum, 27 parts of silica fume, 10 parts of calcium hydroxide, 2 parts of polymeric ferric sulfate, 9 parts of glycine, 4 parts of citrate and 2 parts of tetra sodium ethylenediamine tetraacetate by weight.
Further, the citrate is sodium citrate or calcium citrate.
Further, the mineral powder is S95 grade mineral powder of 750-800 meshes.
Further, sodium silicate has a modulus of 2.0 to 3.5.
Further, the mesh number of the silica fume is 350-400 mesh.
The second technical scheme adopted by the invention is as follows: the preparation method of the admixture for resisting the sulfate corrosion of the concrete comprises the following steps: weighing the raw materials according to the parts by weight, and drying and sieving the raw materials respectively; drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer to stir until the raw materials are uniform; sieving the uniformly stirred mixture to obtain a finished additive product; wherein the raw materials are mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, tetra sodium ethylenediamine tetraacetate and polymeric ferric sulfate respectively. The preparation method is simple in preparation and high in practicability.
Further, the raw materials are sequentially added into a stirrer according to the sequence of mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, tetra sodium ethylenediamine tetraacetate and polymeric ferric sulfate.
Detailed Description
The following detailed description of the preferred embodiments of the invention is provided to enable those skilled in the art to more readily understand the advantages and features of the invention and to make a clear and concise definition of the scope of the invention.
Examples
The invention relates to an admixture for concrete with sulfate corrosion resistance, which comprises, by weight, 20-23 parts of mineral powder, 10-17 parts of sodium silicate, 40-54 parts of potassium alum, 20-27 parts of silica fume, 10-17 parts of calcium hydroxide, 2-4 parts of polymeric ferric sulfate and 8-15 parts of complexing agent. Wherein the complexing agent comprises 5-9 parts of glycine, 2-4 parts of citrate and 1-2 parts of tetra sodium ethylenediamine tetraacetate (EDTA-4 Na). The citrate is sodium citrate or calcium citrate.
In one embodiment, the mineral powder is 750-800 mesh S95 grade mineral powder, the sodium silicate is sodium silicate with a modulus of 2.0-3.5, and the silica fume is 98 grade silica fume with a mesh of 350-400.
In an embodiment, the invention also provides a preparation method of the admixture for resisting the sulfate corrosion of the concrete, which comprises the following steps: weighing the raw materials according to the parts by weight, and drying and sieving the raw materials respectively; drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer according to the sequence of mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, tetra sodium ethylenediamine tetraacetate and polymeric ferric sulfate, and stirring until the raw materials are uniform; sieving the mixture after being stirred uniformly to obtain the finished product of the additive.
According to the invention, mineral powder and silica fume are used as geopolymers, and sodium silicate can be used as an exciting agent for exciting the activity of the geopolymers after being dissolved in water, so that the geopolymers can generate high-strength and non-shrinkage mineral polymer material blocks; meanwhile, the expansion rate of the concrete is improved through potassium alum to compensate the shrinkage of the concrete, and cracks caused by dry shrinkage of the concrete can be reduced through the water-retaining function of the polymeric ferric sulfate, so that under the combined action of the potassium alum and the polymeric ferric sulfate, the cracks at the early stage and the later stage of the concrete can be effectively reduced, and the performance of the concrete for resisting sulfate corrosion is improved by being matched with mineral polymeric material blocks.
On the basis of the excitation of the geopolymer, sodium silicate and calcium hydroxide are added to react to generate hydrated calcium silicate so as to fill micro gaps in the concrete, so that the compactness of the concrete is further improved, and the sulfate erosion resistance of the concrete is further improved.
The additive also enables the concrete to self-heal and improves the performance of resisting chloride ion erosion, specifically, sodium silicate is taken as a precipitator, citrate, glycine and EDTA-4Na are taken as complexing agents, calcium ions in calcium hydroxide are complexed into free complex ions in water environment, the complex ions migrate in water environment by means of concentration difference and react with the precipitator sodium silicate or unhydrated silicate ions in the concrete to generate cracks generated by the hydrated calcium silicate blocking the concrete, the complexing agents after losing the calcium ions continue to complex calcium ions, and in the process, because a large amount of calcium hydroxide and unhydrated silicate ions exist in the concrete, the complexing agents are not consumed, and the process can be regarded as semi-permanent, so the self-healing capacity of the concrete can be effectively improved; the citrate can also increase the plasticity of the concrete and reduce the cracking risk of the concrete; glycine can reduce the activity of chloride ions and further enhance the chlorine salt resistance of concrete.
Because the calcium hydroxide is generated in the hydration process of the concrete, the calcium hydroxide is directly added into the additive, so that the complexing agent can complex calcium ions when the complexing agent is initially stirred with the concrete, preparation is made for the reaction of the precipitant and the calcium ions, and the corrosion resistance of the concrete to the reinforcing steel bar can be improved by adding the calcium hydroxide into the concrete.
Example 1
Weighing 20 parts of mineral powder, 10 parts of sodium silicate, 40 parts of potassium alum, 20 parts of silica fume, 5 parts of glycine, 10 parts of calcium hydroxide, 2 parts of sodium citrate, 1 part of ETDA-4Na and 2 parts of polymeric ferric sulfate, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 400-mesh 98-silica fume, and the modulus of the sodium silicate is 3.0.
The preparation method comprises the following steps: drying and sieving the raw materials respectively, and sequentially adding mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, ETDA-4Na and polymeric ferric sulfate into a powdery material stirrer for stirring until the raw materials are uniform; and then sieving the uniformly stirred mixture to obtain the additive.
Example 2
23 parts of mineral powder, 17 parts of sodium silicate, 40 parts of potassium alum, 27 parts of silica fume, 9 parts of glycine, 10 parts of calcium hydroxide, 4 parts of sodium citrate, 2 parts of ETDA-4Na and 2 parts of polymeric ferric sulfate are weighed, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 400-mesh 98-silica fume, and the modulus of the sodium silicate is 3.0. And the admixture was prepared as in example one.
Example 3
Weighing 20 parts of mineral powder, 10 parts of sodium silicate, 54 parts of potassium alum, 20 parts of silica fume, 5 parts of glycine, 17 parts of calcium hydroxide, 2 parts of sodium citrate, 1 part of ETDA-4Na and 4 parts of polymeric ferric sulfate, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 400-mesh 98-silica fume, and the modulus of the sodium silicate is 3.0. And the admixture was prepared as in example one.
Example 4
23 parts of mineral powder, 17 parts of sodium silicate, 54 parts of potassium alum, 27 parts of silica fume, 9 parts of glycine, 17 parts of calcium hydroxide, 4 parts of sodium citrate, 2 parts of ETDA-4Na and 4 parts of polymeric ferric sulfate are weighed, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 400-mesh 98-silica fume, and the modulus of the sodium silicate is 3.0. And the admixture was prepared as in example one.
Example 5
21 parts of mineral powder, 14 parts of sodium silicate, 48 parts of potassium alum, 24 parts of silica fume, 7 parts of glycine, 13 parts of calcium hydroxide, 3 parts of sodium citrate, 1.5 parts of ETDA-4Na and 3 parts of polymeric ferric sulfate are weighed, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 400-mesh 98-silica fume, and the modulus of the sodium silicate is 3.0. And the admixture was prepared as in example one.
The admixture prepared in examples 1 to 5 was tested according to the test method in concrete sulfuric acid corrosion inhibitor (JC/T1011-2006), and the test results are shown in Table 1.
TABLE 1 detection results of corrosion resistance
As can be seen from Table 1, the properties of the admixture prepared in examples 1-5 are far beyond the specifications of the sulfate-resistant preservative for concrete, wherein the admixture prepared in example 2 has the best impermeability. Therefore, the admixture of the invention has the property of obviously improving the resistance of concrete to sulfate attack.
The effect of the admixture prepared in examples 1 to 5 on the self-healing properties of concrete was tested according to the secondary permeation resistance test in cement-based permeable crystalline waterproof Material (GB 1845-2012), and the test results are shown in Table 2.
TABLE 2 secondary permeation resistance test results
As can be seen from Table 2, the secondary impermeability of the concrete was effectively improved when the admixture prepared in examples 1 to 5 was incorporated in the reference group, wherein the secondary impermeability of the admixture prepared in example 2 and example 4 was optimal. Therefore, the self-healing property of the concrete can be obviously improved by the additive.
The effect of the admixture prepared in examples 1 to 5 on the resistance to erosion by chloride ions of concrete was tested according to the electric flux test in test method Standard for ordinary concrete long-term Properties and durability (GBT 50082-2009), and the test results are shown in Table 3.
TABLE 3 results of electric flux test
It can be seen from table 3 that the electric flux of the concrete was significantly reduced when the additives prepared in examples 1 to 5 were incorporated in the reference group, wherein the electric flux reduction in example 2 was most remarkable. Therefore, the admixture of the invention can obviously improve the chloride ion resistance of concrete.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. An admixture for concrete for resisting sulfate corrosion, which is characterized in that: the additive consists of the following components in parts by weight: 20-23 parts of mineral powder, 10-17 parts of sodium silicate, 40-54 parts of potassium alum, 20-27 parts of silica fume, 10-17 parts of calcium hydroxide, 2-4 parts of polymeric ferric sulfate and 8-15 parts of complexing agent; the complexing agent comprises 5-9 parts of glycine, 2-4 parts of citrate and 1-2 parts of tetra sodium ethylenediamine tetraacetate.
2. The admixture according to claim 1, wherein: the additive consists of the following components in parts by weight: 23 parts of mineral powder, 17 parts of sodium silicate, 40 parts of potassium alum, 27 parts of silica fume, 10 parts of calcium hydroxide, 2 parts of polymeric ferric sulfate, 9 parts of glycine, 4 parts of citrate and 2 parts of tetra sodium ethylenediamine tetraacetate.
3. The admixture according to claim 2, wherein: the citrate is sodium citrate or calcium citrate.
4. The admixture according to claim 1, wherein: the mineral powder is S95 grade mineral powder with 750-800 meshes.
5. The admixture according to claim 1, wherein: the modulus of the sodium silicate is 2.0-3.5.
6. The admixture according to claim 1, wherein: the mesh number of the silica fume is 350-400 mesh.
7. A preparation method of an admixture for concrete with sulfate corrosion resistance is characterized by comprising the following steps: the method comprises the following steps: weighing the raw materials according to the parts by weight, and drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer to stir until the raw materials are uniform; sieving the uniformly stirred mixture to obtain a finished additive product; wherein the raw materials respectively comprise 20-23 parts of mineral powder, 10-17 parts of sodium silicate, 40-54 parts of potassium alum, 20-27 parts of silica fume, 5-9 parts of glycine, 10-17 parts of calcium hydroxide, 2-4 parts of sodium citrate, 1-2 parts of tetra sodium ethylenediamine tetraacetate and 2-4 parts of polymeric ferric sulfate.
8. The method for preparing the admixture according to claim 7, wherein: the raw materials are sequentially added into a stirrer according to the sequence of mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, tetra sodium ethylenediamine tetraacetate and polymeric ferric sulfate.
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| CN109437649A (en) * | 2018-12-29 | 2019-03-08 | 浙江广厦建设职业技术学院 | A kind of preservative of Concrete Resist Reinforcing Sulfate Corrosion and preparation method thereof |
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| KR100499343B1 (en) * | 2002-11-27 | 2005-07-04 | 장산방수산업(주) | Waterproof admixture for concrete having a corrosion inhibition function |
| KR101303622B1 (en) * | 2013-02-21 | 2013-09-11 | 주식회사 인트켐 | Concrete admixture, cement compound and self healing smart concrete using the same |
| CN105084798B (en) * | 2015-08-04 | 2017-04-12 | 河海大学 | Concrete sulfate-corrosion-resistant additive and preparation method thereof |
| CN105731859A (en) * | 2016-02-22 | 2016-07-06 | 沈阳建筑大学 | Internally-doped capillary crystalline waterproof material and preparation method thereof |
| CN108249815A (en) * | 2018-01-16 | 2018-07-06 | 云南森博混凝土外加剂有限公司 | A kind of composite concrete antiseptic agent |
| CN108046641B (en) * | 2018-01-17 | 2020-07-21 | 石家庄学院 | Composite concrete corrosion and rust inhibitor and preparation method thereof |
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| US5928420A (en) * | 1998-09-24 | 1999-07-27 | Lafarge Canada, Inc. | Cement composition for alkali-reactive aggregate and for sulphate resistance |
| JP2006045054A (en) * | 2004-07-06 | 2006-02-16 | Tokyo Electric Power Co Inc:The | Sulphate resistant mortar or concrete |
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| CN109437649A (en) * | 2018-12-29 | 2019-03-08 | 浙江广厦建设职业技术学院 | A kind of preservative of Concrete Resist Reinforcing Sulfate Corrosion and preparation method thereof |
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