CN111908830A - Concrete rust inhibitor and ready-mixed concrete using same - Google Patents
Concrete rust inhibitor and ready-mixed concrete using same Download PDFInfo
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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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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The application relates to the technical field of concrete additives, in particular to a concrete rust inhibitor and ready-mixed concrete using the same, wherein: the concrete rust inhibitor comprises the following components in parts by weight: 0.2-0.6 part of sodium molybdate, 10-16 parts of benzotriazole, 4-8 parts of adhesive, 12-18 parts of octyl triethoxysilane and 30-40 parts of water. The concrete rust inhibitor provided by the invention can ensure the rust inhibiting performance of the rust inhibitor and reduce the defect of soil pollution caused by the rust inhibitor.
Description
Technical Field
The application relates to the technical field of concrete additives, in particular to a concrete rust inhibitor and ready-mixed concrete using the concrete rust inhibitor.
Background
The performance degradation and even failure damage of concrete caused by steel bar corrosion in a chloride environment become a common concern and increasingly prominent problem all over the world, and the damage condition of coastal engineering in China caused by steel bar corrosion is very serious.
The method for improving the durability of the concrete structure in the chloride environment comprises basic measures and additional measures, wherein the basic measures are to adopt high-performance concrete and improve the thickness of a protective layer, and the additional measures comprise corrosion-resistant reinforcing steel bars, annular chloride coating reinforcing steel bars, cathode and anode protection, concrete surface coatings, reinforcing steel bar rust inhibitors and the like; wherein: the steel bar rust inhibitor is one of the most standard additional measures. However, the existing rust inhibitor contains heavy metal nitrite, and has the defect of easy pollution to soil.
Disclosure of Invention
In order to ensure the rust resistance of the rust inhibitor and reduce the defect of soil pollution caused by the rust inhibitor, the application provides the concrete rust inhibitor and the ready-mixed concrete using the rust inhibitor.
In a first aspect, the present application provides a concrete rust inhibitor, which adopts the following technical scheme:
the concrete rust inhibitor comprises the following raw materials in parts by weight: 0.2-0.6 part of sodium molybdate, 10-16 parts of benzotriazole, 4-8 parts of adhesive, 12-18 parts of octyl triethoxysilane and 30-40 parts of water.
By adopting the technical scheme, sodium molybdate is an inhibitory corrosion inhibitor and can react with the steel bar matrix to form a passivation film on the surface of the steel bar matrix, so that the steel bar is protected, chloride ions are prevented from permeating into the steel bar matrix, and the corrosion process of the steel bar is effectively inhibited; benzotriazole is easily adsorbed on the passive film on the surface of the steel bar and filled in micropores between the passive films formed by sodium molybdate, so that the passive film on the surface of the steel bar is more compact, the permeation of chloride ions is further prevented, and the corrosion resistance of the steel bar is further improved; the adhesive is filled in the system, so that the bonding strength among all components of the rust inhibitor can be enhanced, a three-dimensional reticular passive film is formed on the surface of the steel bar, and the protection effect on the surface of the steel bar is enhanced; the octyl triethoxysilane has extremely stable chemical properties, has good resistance to ultraviolet radiation, heat, chemical corrosive solutions and the like, and has small molecular particles, so that the octyl triethoxysilane can effectively permeate into concrete pores to form a firm stable layer, thereby forming a barrier for blocking chloride ions and improving the corrosion resistance of the steel bar; in the formula, a passivation film with a protection function can be formed on the surface of the steel bar without using any nitrite substances, and the advantages of good environment friendliness and good soil pollution are also shown while good rust resistance is ensured.
Preferably, the adhesive is an epoxy resin adhesive.
By adopting the technical scheme, the epoxy resin adhesive has wide application, good adhesive property and particularly good adhesive effect on concrete; in addition, the epoxy resin adhesive and the benzotriazole can act synergistically to form a stable three-dimensional network structure, and the epoxy resin adhesive is coated on the surface of a steel bar matrix, so that the epoxy resin adhesive has a good promoting effect on the corrosion prevention process of the steel bar.
Preferably, the benzotriazole is a water-soluble benzotriazole.
By adopting the technical scheme, on one hand, the water-soluble benzotriazole is selected, so that the benzotriazole can be quickly and uniformly dissolved in a rust inhibitor system, and the rust inhibitor is ensured to have good rust resistance; on the other hand, the synergistic effect between the water-soluble benzotriazole and the epoxy resin adhesive is better, and the rust resistance of the rust inhibitor is further improved.
In a second aspect, the present application provides a ready-mixed concrete, comprising the following raw materials in parts by weight: 80-90 parts of cement, 110-130 parts of gravel, 10-18 parts of fly ash, 25-35 parts of water, 4-7 parts of lubricant, 12-16 parts of filler, 0.5-1.5 parts of rust inhibitor and 0.5-0.8 part of water reducer; wherein: the corrosion inhibitor is the concrete corrosion inhibitor as set forth in any one of claims 1 to 3.
By adopting the technical scheme, the sand is used for improving the structural strength in the concrete, the sand is wetted by water, and the friction force between the sand is reduced by the lubricant, so that the concrete is stirred more uniformly; meanwhile, a gluing system with good gluing effect can be formed by matching cement, fly ash and water, sand, filler and rust inhibitor can be glued together, and the filler is filled in the pores of the concrete, so that the compactness of the concrete is improved, and the compression resistance of the concrete is further enhanced; the rust inhibitor can protect the steel bar base material, slow down the corrosion speed of the steel bar base material and further improve the performance of concrete.
Preferably, the lubricant is a mixture of erucamide and magnesium stearate.
By adopting the technical scheme, the magnesium stearate is an internal lubricant, has good compatibility with each component, and can be uniformly dispersed in a molecular chain, so that the interaction between the molecular chains is weakened, and in addition, the lubricant erucamide is easier to migrate to the surface of concrete; therefore, the magnesium stearate and the erucamide are matched, so that the inside and the outside of a concrete system have good lubricating effect, the components of the concrete are mixed more uniformly, and the uniformity of the quality of the concrete is improved.
Preferably, the filler is at least formed by mixing mica powder, carbon black and a starch/ramie fiber compound.
By adopting the technical scheme, the mica powder and the carbon black have good mechanical hardness and wear resistance, and can be filled in the gaps of the concrete, so that the concrete is more compact, and the compressive strength of the concrete is improved; the ramie fiber has poor interface compatibility, the bonding strength between the ramie fiber and each component is poor, the problem of agglomeration is likely to occur when the ramie fiber is dispersed in concrete, the starch has good viscosity, the interface compatibility of the starch is good, and the starch/ramie fiber compound obtained by compounding the ramie fiber and the starch has not only the heat resistance and the mechanical strength of the ramie fiber but also the problem of poor interface compatibility of the ramie fiber is improved, so that the starch/ramie fiber compound can be uniformly dispersed in each component of the concrete, thereby having good improvement effect on the compressive strength of the concrete.
Preferably, the weight parts of the mica powder, the carbon black and the starch/ramie fiber compound in the filler are about 1: (2.5-4.5): (0.5 to 1.1).
By adopting the technical scheme, the weight parts of the mica powder, the carbon black and the starch/ramie fiber compound are controlled within a reasonable range, the optimal synergistic effect is achieved, the aggregation improvement effect of the compound with the ramie fibers is most obvious, the compactness of a concrete system is improved more obviously, and the compression resistance of the concrete is effectively enhanced.
Preferably, the preparation method of the starch/ramie fiber compound comprises the following steps: 1) adding water into starch in parts by weight to form starch milk; 2) adding a hydrogen peroxide solution into the starch milk and continuously stirring, and dropwise adding a sodium hydroxide solution into the starch milk during stirring to maintain the pH value to be alkaline; 3) dipping ramie fibers in the starch milk obtained in the step 2); 4) and filtering and drying the starch milk and the ramie fiber impregnation liquid to obtain the starch/ramie fiber compound.
By adopting the technical scheme, the starch is firstly oxidized, so that chemical bonds among starch molecules can be broken, and the polymerization degree of the starch molecules is reduced, thereby facilitating the ramie fibers to enter the interior of the starch molecules, enabling the starch and the ramie fibers to be mixed more uniformly, and further enabling the quality of the obtained starch/ramie fiber compound to be more uniform and stable.
Preferably, the water reducing agent is a polycarboxylic acid type water reducing agent.
By adopting the technical scheme, the polycarboxylic acid type water reducing agent is a high-performance water reducing agent, and has low mixing amount, high water reducing rate and small shrinkage; meanwhile, the compatibility of the concrete with the concrete is good, and the slump retentivity of the prepared concrete is good, so that the performance of the prepared concrete is better.
Preferably, the preparation method comprises the following steps: 1) uniformly stirring and mixing cement, gravel, fly ash, a lubricant and a filler in parts by weight to obtain a dry material mixture; 2) uniformly stirring and mixing water and a rust inhibitor in parts by weight to obtain a wet material mixture; 3) and adding the dry material mixture into the wet material mixture, and uniformly stirring to obtain the premixed concrete.
By adopting the technical scheme, the components are divided into a dry material and a wet material, then the dry material and the wet material are separately stirred and mixed, and finally the dry material and the wet material are uniformly stirred and mixed to obtain the premixed concrete with uniform quality; meanwhile, the preparation method is simple and is suitable for batch production.
In summary, the present application includes at least one of the following beneficial technical effects:
1. in the formula, a passivation film with a protection function can be formed on the surface of the steel bar without using any nitrite substances, and the advantages of good environment friendliness and good soil pollution are also shown while good rust resistance is ensured;
2. on one hand, the water-soluble benzotriazole is selected, so that the benzotriazole can be quickly and uniformly dissolved in a rust inhibitor system, and the rust inhibitor is ensured to have good rust resistance; on the other hand, the synergistic effect between the water-soluble benzotriazole and the epoxy resin adhesive is better, so that the rust resistance of the rust inhibitor is further improved;
3. by adopting the matching of magnesium stearate and erucamide, the inside and the outside of a concrete system have good lubricating effect, so that the components of the concrete are mixed more uniformly, and the uniformity of the quality of the concrete is improved.
Detailed Description
The water reducing agent is selected from a polycarboxylic acid type water reducing agent;
the present invention will be described in further detail with reference to examples.
Example 1
And (2) taking a clean container, adding 0.4 part of sodium molybdate, 13 parts of water-soluble benzotriazole, 6 parts of epoxy resin adhesive, 15 parts of octyl triethoxysilane and 35 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Example 2
And (2) taking a clean container, adding 0.2 part of sodium molybdate, 10 parts of water-soluble benzotriazole, 4 parts of epoxy resin adhesive, 12 parts of octyl triethoxysilane and 30 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Example 3
And (2) taking a clean container, adding 0.6 part of sodium molybdate, 16 parts of water-soluble benzotriazole, 8 parts of epoxy resin adhesive, 18 parts of octyl triethoxysilane and 40 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Example 4
And (2) taking a clean container, adding 0.4 part of sodium molybdate, 13 parts of water-soluble benzotriazole, 6 parts of polyurethane adhesive, 15 parts of octyl triethoxysilane and 35 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Example 5
And (2) taking a clean container, adding 0.4 part of sodium molybdate, 13 parts of oil-soluble benzotriazole, 6 parts of epoxy resin adhesive, 15 parts of octyl triethoxysilane and 35 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Example 6
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 6 are specifically shown in table 1 in parts by weight.
Wherein: the rust inhibitor in the embodiment 1 is selected as the rust inhibitor;
the filler is prepared from the following components in parts by weight: 3: 0.8 of mica powder, carbon black and a starch/ramie fiber compound; the preparation method of the starch/ramie fiber compound comprises the following steps:
1) adding water 7 times the weight of the starch into the starch, heating to 80 ℃, and uniformly stirring to form starch milk;
2) adding 10 mass percent of hydrogen peroxide solution into the starch milk, continuously stirring, and dropwise adding 5 mass percent of sodium hydroxide solution into the starch milk during stirring to maintain the pH value at 8;
3) dipping ramie fibers accounting for half of the weight of the starch in the starch milk obtained in the step 2);
4) and filtering and drying the starch milk and the ramie fiber impregnation liquid to obtain the starch/ramie fiber compound.
The preparation method of the premixed concrete comprises the following steps:
1) uniformly stirring and mixing cement, gravel, fly ash, a lubricant and a filler in parts by weight to obtain a dry material mixture;
2) uniformly stirring and mixing water and a rust inhibitor in parts by weight to obtain a wet material mixture;
3) and adding the dry material mixture into the wet material mixture, and uniformly stirring to obtain the premixed concrete.
Example 7
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 7 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Example 8
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 8 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Example 9
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 9 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Example 10
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 10 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Example 11
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 11 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
The filler is prepared from the following components in parts by weight: 2.5: 0.5 of mica powder, carbon black and a starch/ramie fiber compound;
the preparation of the starch/ramie fiber combination is as in example 6.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 12
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 12 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
The filler is prepared from the following components in parts by weight: 4.5: 1.1, mixing mica powder, carbon black and a starch/ramie fiber compound;
the preparation of the starch/ramie fiber combination is as in example 6.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 13
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 13 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
The filler is prepared from the following components in parts by weight: 2: 1, mica powder, carbon black and a starch/ramie fiber compound; the preparation of the starch/ramie fiber combination is as in example 6.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 14
The composition and the proportion of the raw materials of the ready-mixed concrete provided in example 14 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
The filler is prepared from the following components in parts by weight: 5: 1, mica powder, carbon black and a starch/ramie fiber compound; the preparation of the starch/ramie fiber combination is as in example 6.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 15
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 15 are the same as those in example 6 in parts by weight.
Wherein: the composition and the proportion of the filler are the same as those of the filler in example 6, and are different from those of the filler in example 6:
the preparation method of the starch/ramie fiber compound comprises the following steps:
1) adding water 7 times the weight of the starch into the starch, heating to 80 ℃, and uniformly stirring to form starch milk;
2) dipping ramie fibers accounting for half of the weight of the starch in the starch milk obtained in the step 1);
3) and filtering and drying the starch milk and the ramie fiber impregnation liquid to obtain the starch/ramie fiber compound.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 16
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 16 are the same as those in example 6 in parts by weight.
Wherein: the rust inhibitor in the embodiment 2 is selected as the rust inhibitor.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 17
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 17 were the same as those in example 6 in parts by weight.
Wherein: the rust inhibitor in example 3 was selected as the rust inhibitor.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 18
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 18 are the same as those in example 6 in parts by weight.
Wherein: the rust inhibitor in example 4 was used.
Preparation of ready-mixed concrete was carried out as in example 6.
Example 19
The raw material composition and the compounding ratio of the ready-mixed concrete provided in example 19 are the same as those in example 6 in parts by weight.
Wherein: the rust inhibitor in example 5 was used.
Preparation of ready-mixed concrete was carried out as in example 6.
Comparative example 1
And (2) taking a clean container, adding 0.4 part of sodium nitrite, 13 parts of water-soluble benzotriazole, 6 parts of epoxy resin adhesive, 15 parts of octyl triethoxysilane and 35 parts of water, and uniformly stirring to form the concrete rust inhibitor.
Comparative example 2
The composition and the proportion of the raw materials of the ready-mixed concrete provided in comparative example 2 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Preparation of ready-mixed concrete was carried out as in example 6.
Comparative example 3
The raw material composition and the compounding ratio of the ready-mixed concrete provided in comparative example 3 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Comparative example 4
The composition and the proportion of the raw materials of the ready-mixed concrete provided in comparative example 4 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
Comparative example 5
The composition and the proportion of the raw materials of the ready-mixed concrete provided in comparative example 5 are different from those of example 6 in parts by weight, and are specifically shown in table 1.
Wherein: preparation of ready-mixed concrete was carried out as in example 6.
TABLE 1 ingredient composition and parts by weight ratio tables for examples 6 to 14 and comparative examples 2 to 5
Performance detection
Corrosion resistance
The concrete rust inhibitor prepared in the embodiments 1 to 5 is used as an external additive and is respectively added into the concrete prepared in the embodiments 6, 16, 17, 18 and 19 to obtain samples I to V; adding the concrete prepared in example 1 as an external additive to the concrete in comparative example 1 to obtain a sample VI; adding 1000ml of 10% saline water by mass into 10 samples I-VI, respectively observing the corrosion degree of the steel bars in the reinforced concrete in 5 days, 15 days, 25 days and 35 days, and classifying the corrosion degree into the following grades:
a level: no obvious change exists;
b stage: rust exists, and the surface rust area is less than 5%;
c level: rust is present, 5% < surface rust area < 15%;
d stage: rust exists, and the surface rust area is more than 15%;
the results of the measurements are reported in table 2.
TABLE 2 detection and record table for corrosion resistance of concrete corrosion inhibitor
The premixed concrete prepared according to the formulations and preparation methods of examples 6 to 19 and comparative examples 2 to 5 was sampled, a cubic sample having a side length of 70.7mm was prepared from the premixed concrete, the following performance test tests were performed on the sample, and the test results are shown in table 3.
Second, compressive strength
With reference to the national standard GB/T50081-2002 Standard for testing mechanical properties of ordinary concrete, the compressive strength test is carried out after curing for 28 days under standard curing conditions (temperature (20 +/-2) DEG C and relative humidity of more than 90%).
Third, crack resistance
And making a standard test block by referring to GB/T50081-2016 (Standard test method for mechanical properties of common concrete), and measuring after concrete pouring for 24 hours to obtain the number of cracks in a unit area and the total crack area in the unit area.
TABLE 3 tables of the performance test records of examples 6 to 19 and comparative examples 2 to 5
The test results in the performance test table show that:
1. according to the results of the rust resistance detection of the sample I and the sample III, it can be seen that: the three groups of samples have better rust resistance, which shows that the concrete rust inhibitor with better performance can be obtained by proportioning the raw materials.
2. The corrosion resistance of samples I-III was superior to that of sample IV, probably because: the epoxy resin adhesive and the benzotriazole can act synergistically to form a stable three-dimensional network structure, and the epoxy resin adhesive is coated on the surface of a steel bar matrix, so that the epoxy resin adhesive has a good promotion effect on the corrosion prevention process of the steel bar.
3. The corrosion resistance of samples I-III was superior to that of sample V, probably because: on one hand, the water-soluble benzotriazole can enable the benzotriazole to be quickly and uniformly dissolved in a rust inhibitor system, and can ensure that the rust inhibitor has good rust resistance.
4. According to the results of the rust resistance detection of the samples I to III and the sample VI, it can be seen that: the samples I-III are superior to the rust resistance of the sample VI, and the rust inhibitors used in the samples I-III do not contain nitrite, so that the rust resistance of the steel bar base material can be guaranteed, the soil is not polluted, and the steel bar base material is good in environment friendliness.
5. From the examples 6 to 8, it can be seen that each property of the concrete is excellent, which indicates that the concrete with better property can be obtained by proportioning the raw materials.
6. From examples 9-10, it can be seen that the properties of the sample of example 1 are better than those of the samples of examples 9-10, probably because: by adopting the matching of magnesium stearate and erucamide, the inside and the outside of a concrete system have good lubricating effect, so that the components of the concrete are mixed more uniformly, the uniformity of the quality of the concrete is improved, and the mechanical performance of the concrete is improved.
7. It can be seen from examples 11-14 that the properties of the samples of examples 1, 11 and 12 are better than those of the samples of examples 13 and 14, probably because: controlling the weight parts of mica powder, carbon black and a starch/ramie fiber compound to be 1: (2.5-4.5): (0.5-1.1), the concrete has the best synergistic effect, the aggregate improvement effect with ramie fibers is most obvious, the compactness of a concrete system is improved more obviously, and the compression resistance of the concrete is effectively enhanced.
8. From example 15, it can be seen that the properties of the sample of example 1 are superior to those of the sample of example 15, probably because: the method is characterized in that starch is oxidized firstly, so that chemical bonds among starch molecules can be broken, and the polymerization degree of the starch molecules is reduced, thereby facilitating ramie fibers to enter the interior of the starch molecules, enabling the starch and the ramie fibers to be mixed more uniformly, and being beneficial to improving the mechanical property of concrete.
9. As can be seen from examples 16 to 19, the properties of the sample of example 1 are not much different from those of the samples of examples 16 to 19, which shows that: the addition of the rust inhibitor into the concrete system has no obvious influence on the compression resistance and the crack resistance of the concrete, and meets the standard.
10. As can be seen from comparative examples 2-5, the properties of the sample of example 1 are better than those of the samples of examples 5-6, probably because: the mica powder and the carbon black have good mechanical hardness and wear resistance, and can be filled in gaps of concrete to enable the concrete to be more compact, so that the compressive strength of the concrete is improved; meanwhile, the mica powder, the carbon black and the starch/ramie fiber compound are mixed to form a three-dimensional network structure, so that the concrete performance is improved most obviously.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The concrete rust inhibitor is characterized by comprising the following raw materials in parts by weight: 0.2-0.6 part of sodium molybdate, 10-16 parts of benzotriazole, 4-8 parts of adhesive, 12-18 parts of octyl triethoxysilane and 30-40 parts of water.
2. The concrete rust inhibitor according to claim 1, characterized in that: the adhesive is an epoxy resin adhesive.
3. The concrete rust inhibitor according to claim 1, characterized in that: the benzotriazole is water-soluble benzotriazole.
4. The premixed concrete is characterized by comprising the following raw materials in parts by weight: 80-90 parts of cement, 110-130 parts of gravel, 10-18 parts of fly ash, 25-35 parts of water, 4-7 parts of lubricant, 12-16 parts of filler, 0.5-1.5 parts of rust inhibitor and 0.5-0.8 part of water reducer; wherein: the corrosion inhibitor is the concrete corrosion inhibitor as set forth in any one of claims 1 to 3.
5. The ready mixed concrete according to claim 4, wherein: the lubricant is a mixture of erucamide and magnesium stearate.
6. The ready mixed concrete according to claim 4, wherein: the filler is at least formed by mixing mica powder, carbon black and a starch/ramie fiber compound.
7. The ready mixed concrete according to claim 6, characterized in that: the filler is prepared from the mica powder, the carbon black and the starch/ramie fiber compound in a weight ratio of 1: (2.5-4.5): (0.5 to 1.1).
8. The ready mixed concrete according to claim 6, characterized in that: the preparation method of the starch/ramie fiber compound comprises the following steps: 1) adding water into starch in parts by weight to form starch milk; 2) adding a hydrogen peroxide solution into the starch milk and continuously stirring, and dropwise adding a sodium hydroxide solution into the starch milk during stirring to maintain the pH value to be alkaline; 3) dipping ramie fibers in the starch milk obtained in the step 2); 4) and filtering and drying the starch milk and the ramie fiber impregnation liquid to obtain the starch/ramie fiber compound.
9. The ready mixed concrete according to claim 6, characterized in that: the water reducing agent is a polycarboxylic acid type water reducing agent.
10. The ready mixed concrete according to claim 6, characterized in that: the preparation method comprises the following steps: 1) uniformly stirring and mixing cement, gravel, fly ash, a lubricant and a filler in parts by weight to obtain a dry material mixture; 2) uniformly stirring and mixing water and a rust inhibitor in parts by weight to obtain a wet material mixture; 3) and adding the dry material mixture into the wet material mixture, and uniformly stirring to obtain the premixed concrete.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115536306A (en) * | 2022-10-21 | 2022-12-30 | 南京腾恒新材料有限公司 | Anticorrosive concrete additive and preparation method thereof |
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