CN114213050A - Sulfate corrosion-resistant additive for concrete and preparation method thereof - Google Patents
Sulfate corrosion-resistant additive for concrete and preparation method thereof Download PDFInfo
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- CN114213050A CN114213050A CN202210022365.9A CN202210022365A CN114213050A CN 114213050 A CN114213050 A CN 114213050A CN 202210022365 A CN202210022365 A CN 202210022365A CN 114213050 A CN114213050 A CN 114213050A
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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 a sulfate corrosion resistant additive for concrete and a preparation method thereof, wherein the additive 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 a complexing agent. The preparation method comprises weighing the raw materials respectively 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 be stirred until the raw materials are uniform; and sieving the uniformly stirred mixture to obtain the additive finished product. 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 a sulfate corrosion-resistant concrete additive 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 the focus of attention in recent years. The sulfate corrosion damage is considered to be one of the main factors causing the failure damage of concrete materials, when sulfate ions in the environment reach a certain concentration and the concrete structure does not adopt any protective measures, the external sulfate ions easily invade into the concrete, react and cause expansion, and finally cause the damage of the concrete structure.
In order to inhibit the sulfate corrosion of concrete, the existing method mostly adopts an outer coating preservative or increases the thickness of a protective layer, but the outer coating preservative can not carry out corrosion prevention on underground structures such as cast-in-place piles, continuous walls and the like, and the increase of the thickness of the protective layer can increase the self weight of a concrete structure, so that the total cost is increased due to the corresponding increase of reinforcing bars in the concrete structure and the requirement on foundation engineering. Some internal-doped preservatives internally doped in concrete appear in the market at present, but gel generated by reaction of the existing internal-doped preservatives and calcium hydroxide in the concrete contains more bound water, is easy to shrink, and can cause the corrosion prevention function of the concrete to lose efficacy after a period of time.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide an additive for resisting sulfate corrosion of concrete and a preparation method thereof, which improve the long-acting corrosion resistance of the concrete and enable the concrete to have longer sulfate corrosion resistance.
In order to achieve the above purpose, one of the technical schemes adopted by the invention is as follows: the additive for resisting sulfate corrosion of concrete 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 a complexing agent.
The invention has the beneficial effects that:
1. mineral powder and silica fume are used as geopolymers, and when the sodium silicate is dissolved in water, the sodium silicate can be used as an excitant for exciting the activity of the geopolymers, so that the geopolymers can generate high-strength non-shrinkable mineral polymer material blocks; meanwhile, the expansion rate of the concrete is improved through potassium alum to compensate the shrinkage of the concrete, and the cracks of the concrete caused by drying shrinkage can be reduced through the water retention function of the polyferric sulfate, so that the cracks of the concrete at the early stage and the later stage can be effectively reduced under the combined action of the potassium alum and the polyferric sulfate, and the sulfate corrosion resistance of the concrete is improved by matching with the mineral polymeric material block;
2. on the basis of geopolymer excitation, sodium silicate reacts with calcium hydroxide to generate calcium silicate hydrate so as to fill tiny gaps in concrete, so that the compactness of the concrete is further improved, and the sulfate corrosion resistance of the concrete is further improved;
3. the method is characterized in that sodium silicate is used as a precipitator, calcium ions in calcium hydroxide are complexed into free complex ions in a water environment through a complexing agent, the complex ions migrate in the water environment depending on concentration difference and react with unhydrated silicate ions in the precipitator sodium silicate or concrete to generate hydrated calcium silicate to block cracks generated in the concrete, and the complexing agent losing the calcium ions continues to complex calcium ions in cycles;
4. because the concrete can generate calcium hydroxide in the hydration process, the calcium hydroxide is directly added into the additive, so that the complexing agent can complex calcium ions when being stirred with the concrete at the beginning, the preparation is made for the reaction of the precipitator and the calcium ions, and the calcium hydroxide doped in the concrete can improve the reinforcement corrosion resistance of the concrete.
Further, the complexing agent comprises, by weight, 5-9 parts of glycine, 2-4 parts of citrate and 1-2 parts of tetrasodium ethylene diamine tetraacetate. The complexing effect of the tetrasodium ethylene diamine tetraacetate is the best, and the tetrasodium ethylene diamine tetraacetate is used as a main complexing agent; the citrate can be used as a complexing agent, and can also increase the plasticity of the concrete and reduce the cracking risk of the concrete; the glycine can reduce the activity of chloride ions while being used as a complexing agent, and further enhance the chlorine salt resistance of concrete.
Further, the additive comprises 23 parts by weight of mineral powder, 17 parts by weight of sodium silicate, 40 parts by weight of potassium alum, 27 parts by weight of silica fume, 10 parts by weight of calcium hydroxide, 2 parts by weight of polymeric ferric sulfate, 9 parts by weight of glycine, 4 parts by weight of citrate and 2 parts by weight of tetrasodium ethylenediamine tetraacetate.
Further, the citrate is sodium citrate or calcium citrate.
Further, the ore powder is 750-800-mesh S95-grade ore powder.
Further, the modulus of sodium silicate is 2.0 to 3.5.
Further, the mesh number of the silica fume is 350-400 meshes.
The second technical scheme adopted by the invention is as follows: a method for preparing an additive for resisting sulfate corrosion of concrete comprises the following steps: weighing the raw materials in parts by weight respectively, and drying and sieving the raw materials respectively; drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer to be stirred 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, tetrasodium ethylene diamine tetraacetate and polymeric ferric sulfate. The preparation method is simple and practical.
Further, the raw materials are sequentially added into the stirrer according to the sequence of mineral powder, sodium silicate, potassium alum, silica fume, glycine, calcium hydroxide, sodium citrate, tetrasodium ethylene diamine tetraacetate and polymeric ferric sulfate.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Examples
The invention relates to a sulfate corrosion resistant additive for concrete, 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 a complexing agent. Wherein the complexing agent comprises 5-9 parts of glycine, 2-4 parts of citrate and 1-2 parts of ethylene diamine tetraacetic acid tetrasodium (EDTA-4 Na). The citrate is sodium citrate or calcium citrate.
In one embodiment, the ore powder is 750-800 mesh S95-grade ore powder, the sodium silicate is 2.0-3.5 modulus, and the silica fume is 350-400 mesh 98 silica fume.
In one embodiment, the invention also provides a preparation method of the sulfate corrosion-resistant additive for concrete, which comprises the following steps: weighing the raw materials in parts by weight respectively, 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, ethylene diamine tetraacetic acid tetrasodium salt and polymeric ferric sulfate, and stirring until the mixture is uniform; and sieving the uniformly stirred mixture to obtain the additive finished product.
Mineral powder and silica fume are used as geopolymers, and when the sodium silicate is dissolved in water, the sodium silicate can be used as an excitant for exciting the activity of the geopolymers, so that the geopolymers can generate high-strength non-shrinkable mineral polymer material blocks; simultaneously, improve the expansion rate of concrete through potassium alum to the shrink of compensation concrete can reduce the crack that the concrete leads to because of the shrinkage by water retention function through polyferric sulfate, consequently, under potassium alum, polyferric sulfate's combined action, can effectively reduce the crack in concrete earlier stage and later stage, and then cooperate the mineral polymeric material block to promote the anti sulphate type of concrete and corrode the performance.
On the basis of geopolymer excitation, sodium silicate reacts with calcium hydroxide to generate calcium silicate hydrate so as to fill tiny gaps in concrete, so that the compactness of the concrete is further improved, and the sulfate corrosion resistance of the concrete is further improved.
The admixture also enables the concrete to self-heal and improves the performance of resisting chloride ion corrosion, specifically, sodium silicate is used as a precipitator, citrate, glycine and EDTA-4Na are used as complexing agents, calcium ions in calcium hydroxide are complexed into free complex ions in a water environment, the complex ions migrate in the water environment depending on concentration difference and react with silicate ions which are not hydrated in the precipitator sodium silicate or the concrete to generate hydrated calcium silicate to block cracks generated by the concrete, the complexing agents after losing the calcium ions continue to complex calcium ions and are repeated in a week, in the process, because a large amount of calcium hydroxide and unhydrated silicate ions exist in the concrete and the complexing agents cannot be consumed, the process can be regarded as semi-permanent, and therefore, the self-healing capability 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; the glycine can reduce the activity of chloride ions and further enhance the chlorine salt resistance of concrete.
Because the concrete can generate calcium hydroxide in the hydration process, the calcium hydroxide is directly added into the additive, so that the complexing agent can complex calcium ions when being stirred with the concrete at the beginning, the preparation is made for the reaction of the precipitator and the calcium ions, and the calcium hydroxide doped in the concrete can improve the reinforcement corrosion resistance of 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 98-mesh silica fume with 400 meshes, 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 then sequentially adding the 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 mixture is uniform; then the mixture after being stirred evenly is sieved to prepare the admixture.
Example 2
Weighing 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, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 98-mesh silica fume with 400 meshes, and the modulus of the sodium silicate is 3.0. The admixture was prepared according to the preparation method of 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 98-mesh silica fume with 400 meshes, and the modulus of the sodium silicate is 3.0. The admixture was prepared according to the preparation method of example one.
Example 4
Weighing 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, 4 parts of ETDA-4Na 2 and 4 parts of polymeric ferric sulfate, wherein the mineral powder is 800-mesh S90-grade mineral powder, the silica fume is 98-mesh silica fume with 400 meshes, and the modulus of the sodium silicate is 3.0. The admixture was prepared according to the preparation method of example one.
Example 5
Weighing 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, 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 admixture was prepared according to the preparation method of example one.
The admixtures prepared in examples 1-5 were tested according to the test method in concrete sulfuric acid corrosion resistance preservative (JC/T1011-2006), and the test results are shown in Table 1.
TABLE 1 results of corrosion resistance test
As can be seen from Table 1, the properties of the admixtures obtained in examples 1-5 far exceed the specification of concrete anti-sulfate type corrosion inhibitor, wherein the impermeability of the admixture obtained in example 2 is the best. Therefore, the additive of the invention has the advantage of remarkably improving the sulfate corrosion resistance of concrete.
The effect of the admixtures prepared in examples 1 to 5 on the self-healing properties of concrete was tested according to the secondary impermeability test in the cement-based permeable crystalline waterproofing material (GB18445-2012), and the test results are shown in table 2.
TABLE 2 Secondary impermeability test results
As can be seen from Table 2, the secondary impermeability of the concrete was effectively improved when the admixtures according to examples 1 to 5 were incorporated into the reference group, wherein the admixtures according to examples 2 and 4 had the best secondary impermeability. Therefore, the admixture of the invention can obviously improve the self-healing performance of concrete.
The effect of the admixtures prepared in examples 1 to 5 on the resistance of concrete to attack by chloride ions was tested according to the electric flux test in Standard test methods for Long-term Performance and durability of ordinary concrete (GBT50082-2009), and the test results are shown in Table 3.
TABLE 3 electric flux test results
As can be seen from Table 3, when the admixtures prepared in examples 1 to 5 were incorporated into the reference group, the electric flux of the concrete was significantly reduced, wherein the electric flux reduction of example 2 was most significant. Therefore, the admixture of the invention can obviously improve the chloride ion resistance of concrete.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. An additive for resisting sulfate erosion of concrete is characterized in that: the additive 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 a complexing agent.
2. The admixture of claim 1, wherein: the complexing agent comprises, by weight, 5-9 parts of glycine, 2-4 parts of citrate and 1-2 parts of tetrasodium ethylene diamine tetraacetate.
3. The admixture of claim 2, wherein: the additive comprises, 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 tetrasodium ethylene diamine tetraacetate.
4. The admixture according to claim 2 or 3, wherein: the citrate is sodium citrate or calcium citrate.
5. The admixture of claim 1, wherein: the ore powder is 750-800-mesh S95-grade ore powder.
6. The admixture of claim 1, wherein: the modulus of the sodium silicate is 2.0-3.5.
7. The admixture of claim 1, wherein: the mesh number of the silica fume is 350-400 meshes.
8. A preparation method of an additive for resisting sulfate corrosion of concrete is characterized by comprising the following steps: the method comprises the following steps: weighing the raw materials in parts by weight respectively, and drying and sieving the raw materials respectively; drying and sieving the raw materials respectively; sequentially adding the raw materials into a stirrer to be stirred 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, tetrasodium ethylene diamine tetraacetate and polymeric ferric sulfate.
9. The method for preparing the admixture according to claim 8, 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, tetrasodium ethylene diamine tetraacetate and polymeric ferric sulfate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115231852A (en) * | 2022-08-18 | 2022-10-25 | 北京砼固新材料科技有限公司 | Proliferation type concrete compacting agent and preparation method thereof |
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