阅读说明：本技术 一种混凝土抗侵蚀剂及其制备方法 (Concrete erosion-resistant agent and preparation method thereof ) 是由 郑宝霞 岑儒湛 于 2020-06-05 设计创作，主要内容包括：一种混凝土抗侵蚀剂及其制备方法,利用了硅铝质材、塑化剂、膨胀剂、引气剂、硅灰石、阻锈剂、轻烧氧化镁,在特定的比例配合下加入到混凝土中可极大的增加混凝土性能,提高抗硫酸盐和抗氯离子侵蚀侵蚀,减少干缩,降低混凝土的透水性和各种离子的渗透性,对钢筋具有极好的钝化阻锈和保护作用,改善和提高混凝土的施工性能和服役性能,可使建筑物使用寿命延长40-50年,生产工艺简单,使用方便,适用性强,应用效果非常突出,采用本发明产品配制的混凝土,其抗硫酸盐侵蚀能力可提高6-8倍,抗氯离子渗透能力可提高4倍以上,在混凝土结构使用环境不变情况下,可提高混凝土结构使用寿命。(A concrete corrosion-resistant agent and its preparation method, utilize silica-alumina material, plasticizer, swelling agent, air entraining agent, wollastonite, rust inhibitor, light burnt magnesia, add into concrete under specific proportion and cooperating, can greatly increase the concrete performance, improve sulfate and resisting the erosion of chloride ion, reduce the drying shrinkage, reduce the water permeability of the concrete and permeability of various ions, have very good passivation, rust inhibition and protective action to the steel reinforcement, improve and improve the workability and service property of the concrete, can make the building service life lengthen 40-50 years, the production technology is simple, easy to use, the serviceability is strong, the application effect is very prominent, the concrete prepared by adopting the product of the invention, its sulfate erosion-resistant ability can be improved by 6-8 times, the chloride ion permeability can be improved by more than 4 times, under the situation that the concrete structure uses the environment and does not change, the service life of the concrete structure can be prolonged.)

1. A concrete erosion-resistant agent is characterized in that: the erosion-resistant agent comprises the following components in parts by weight:

a silicon aluminum material 100;

2-4 parts of plasticizer;

40-70 parts of a swelling agent;

0.1-0.2 of air entraining agent;

45-65 parts of wollastonite;

0.1-0.3 of rust inhibitor;

and (3) lightly-calcined magnesia 8-10.

2. A concrete erosion-resistant agent as claimed in claim 1, wherein: the silicon-aluminum material is one or two selected from coal gangue and fly ash.

3. A concrete erosion-resistant agent as claimed in claim 1, wherein: the plasticizer is one or a mixture of more than two of polycarboxylic acids, sulfamic acid and melamine water reducing agents.

4. A concrete erosion-resistant agent as claimed in claim 1, wherein: the swelling agent is selected from sulphoaluminate swelling agents.

5. A concrete erosion-resistant agent as claimed in claim 1, wherein: the content of the plasticizer is 3.5.

6. A concrete erosion-resistant agent as claimed in claim 1, wherein: the swelling agent is 40-70; the wollastonite is 25 to 50, and the rust inhibitor is 0.1 to 0.3.

7. A concrete erosion-resistant agent as claimed in claim 1, wherein: the air entraining agent comprises sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and the content of the sodium dodecyl sulfate and the content of the sodium dodecyl benzene sulfonate are respectively 0.025-0.2 and 0.05-0.1.

8. A concrete erosion-resistant agent as claimed in claim 1, wherein: the rust inhibitor is prepared by uniformly mixing aminocarboxylic acid, dimethylethanolamine and calcium molybdate according to the mass ratio of 1:3: 1.

9. The method for preparing the concrete erosion-resistant agent according to claim 1, wherein: the method comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

3.5 of plasticizer;

a thioaluminate swelling agent 55;

sodium dodecyl sulfate 0.04;

sodium dodecyl benzene sulfonate 0.08;

55 parts of wollastonite;

0.15 of rust inhibitor;

light-burned magnesium oxide 8;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent and the wollastonite, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

Technical Field

The invention relates to a building material, in particular to a concrete erosion-resistant agent and a preparation method thereof.

Background

Concrete is excellent in durability as a building material which is most widely used. However, in the environment of practical engineering application, the concrete is often affected by acid, alkali and salt, so that the carbonization of the concrete is deepened, alkali-aggregate reaction, sulfate corrosion, chloride ion permeation and the like occur, and expansion cracking, structure loosening, steel bar corrosion and other phenomena are easily caused under the corrosion, so that the concrete structure is damaged, the safety of a building is affected, and great economic loss and resource waste are caused. People do a lot of work to solve the problem of the corrosivity of concrete, such as increasing the cement dosage, doping a water reducing agent, improving the aggregate proportion and other methods to improve the compactness of the concrete and prevent the harm of corrosive ions, but the method has low effect and high cost; the sulfate-resistant cement is used for replacing common cement, so that the sulfate corrosion resistance of the concrete is improved, but the corrosion resistance effect is poor under the condition of coexistence of chloride ions and sulfate ions, and the cost is high; the thickness of the concrete protective layer is increased, but the manufacturing cost is extremely high; the concrete surface is painted, but the paint is easy to fall off.

After the concrete expanding agent is successfully developed, the impermeability and compactness of concrete are improved by adopting measures of singly doping the expanding agent or compounding and doping the expanding agent and the water reducing agent, but the practicability of the measures is not strong because the measures depend on the expansibility and the filling property of the expanding agent excessively.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a concrete erosion-resistant agent integrating water reduction, fluidity loss maintenance, densification, erosion resistance and other reactions, and a preparation method and application thereof.

The purpose of the invention can be realized by the following technical scheme:

the concrete erosion-resistant agent is characterized by comprising the following components in parts by weight:

a silicon aluminum material 100;

2-4 parts of plasticizer;

40-70 parts of a swelling agent;

0.1-0.2 of air entraining agent;

45-65 parts of wollastonite;

0.1-0.3 of rust inhibitor;

and (3) lightly-calcined magnesia 8-10.

The silicon-aluminum material is one or two selected from coal gangue and fly ash.

The plasticizer is one or a mixture of more than two of polycarboxylic acids, sulfamic acids and melamine water reducers; the swelling agent is selected from sulphoaluminate swelling agents.

The content of the plasticizer, preferably 2 to 4; the swelling agent is preferably 40-70; the wollastonite is preferably 25 to 50, and the rust inhibitor is preferably 0.1 to 0.3.

The air entraining agent comprises sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and the content (weight parts) of the sodium dodecyl sulfate and the sodium dodecyl benzene sulfonate is 0.025-0.2 and 0.05-0.1 respectively.

The content (weight portion) of the sodium dodecyl sulfate and the sodium dodecyl benzene sulfonate is respectively optimized

0.03-0.10 and 0.07-0.09.

The rust inhibitor is prepared by uniformly mixing aminocarboxylic acid, dimethylethanolamine and calcium molybdate according to the mass ratio of 1:3: 1.

The firing temperature of the light-burned magnesia is 800-900 ℃, and the MgO content is more than 90 mass percent.

The preparation method of the concrete erosion-resistant agent is characterized by comprising the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

2-4 parts of plasticizer;

30-80 parts of swelling agent;

0.075-0.3 of air entraining agent;

45-65 parts of wollastonite;

0.1-0.3 of rust inhibitor;

8-10 parts of light-burned magnesium oxide;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent and the wollastonite, mechanically mixing 10-15 parts and uniformly mixing to obtain the concrete erosion-resistant agent.

The application of the concrete erosion-resisting agent comprises the step of mixing the concrete erosion-resisting agent into cement or a cementing material to serve as an erosion-resisting agent, wherein the mixing amount of the concrete erosion-resisting agent is 4% -8% of the total amount of the cement or the cementing material, and then stirring is carried out for 10-15 min.

In the invention, the silica-alumina material has a certain water reducing effect, can greatly improve the workability of concrete together with a plasticizer, has higher activity than common fly ash, has very strong secondary volcanic ash effect, greatly contributes to the early and later strength of the concrete, and supplements a certain amount of active Al2O3 for the concrete, which is very beneficial to the sulfate erosion resistance, the chloride ion erosion resistance and the carbonization resistance of the concrete.

The plasticizer is one or a mixture of more than two of polycarboxylic acids, naphthalene sulfonic acids and melamine water reducers, so that the water consumption can be reduced by about 20 percent under the condition that the concrete keeps the same slump, the water consumption can play a role of superimposed water reduction under the condition that the plasticizer and the silicon-aluminum material coexist, the water consumption can be reduced by more than 25 percent, and the water reduction efficiency of the high-efficiency water reducer is achieved.

The sulphoaluminate expanding agent has the function of participating in the hydration process of cement, and improves the crack resistance and the water resistance of concrete.

The sodium dodecyl sulfate and the sodium dodecyl benzene sulfonate are air entraining agent components, and have the functions of leading in a large amount of uniform, stable and closed fine micro bubbles in the process of mixing the concrete and improving the toughness and the crack resistance of the concrete.

The corrosion inhibitor prepared by uniformly mixing the aminocarboxylic acid, the dimethylethanolamine and the calcium molybdate according to the mass ratio of 1:3:1 has excellent passivation, corrosion inhibition and protection effects on the steel bar, and the service life of a building can be prolonged by 40-50 years by adding 0.1-0.3 part of corrosion inhibitor.

The light calcined magnesia has the function that the calcined magnesia has expansion performance, can further compact and strengthen concrete, reduce dry shrinkage and obviously reduce the water permeability of the concrete and the permeability of various ions.

The erosion-resistant agent of the invention can integrate water reduction, fluidity loss maintenance, densification, water resistance and erosion resistance reaction under the condition that the mixing amount is 4-8 percent (accounting for the mass percent of cement or gelled materials), can greatly increase the strength of concrete, and improve the construction performance and service performance of the concrete.

Compared with the prior art, the product of the invention utilizes the silicon-aluminum material, the plasticizer, the expanding agent, the air entraining agent,

Wollastonite, rust inhibitor and light burned magnesium oxide are added into concrete according to a specific proportion, so that the performance of the concrete can be greatly improved, sulfate and chloride ion corrosion resistance is improved, drying shrinkage is reduced, the water permeability and the permeability of various ions of the concrete are reduced, the concrete has excellent passivation, rust inhibition and protection effects on reinforcing steel bars, the construction performance and service performance of the concrete are improved and improved, the service life of a building can be prolonged by 40-50 years, the production process is simple, the use is convenient, the applicability is strong, the application effect is very remarkable, the sulfate corrosion resistance of the concrete prepared by the product can be improved by 6-8 times, the chloride ion permeability can be improved by more than 4 times, and the service life of the concrete structure can be prolonged under the condition that the use environment of the concrete structure is unchanged.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

A preparation method of a concrete erosion-resistant agent comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

silicon aluminum material 100

Plasticizer 4

Sulphoaluminate swelling agent 45

Sodium dodecyl sulfate 0.03

Sodium dodecyl benzene sulfonate 0.08

Wollastonite 50

Rust inhibitor 0.1

Light-burned magnesia 8

(2) Putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent, the wollastonite and the light-burned magnesium oxide, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

The product of the invention is added into concrete which accounts for 8 percent of the weight of the cement, and then the mixture is stirred for 10 to 15min, so that the water reducing rate of the concrete reaches 23 percent, the bleeding rate ratio is 0, the water absorption ratio is 32 percent, the compressive strength ratios of the concrete for 3 days, 7 days and 28 days are 165 percent, 153 percent and 145 percent respectively, the penetration height ratio of the concrete is 31 percent, the water absorption ratio is 38 percent, the 5 hCl-electric flux is reduced from 1700C to 550C, and after the concrete is soaked and dried for 50 times by saturated sodium sulfate solution, the strength loss rate is only 2 percent and the weight loss rate is 0.

Example 2

A preparation method of a concrete erosion-resistant agent comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

3.5 of plasticizer;

a thioaluminate swelling agent 55;

sodium dodecyl sulfate 0.04;

sodium dodecyl benzene sulfonate 0.08;

55 parts of wollastonite;

0.15 of rust inhibitor;

light-burned magnesium oxide 8;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent, the wollastonite and the light-burned magnesium oxide, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

The product of the invention is added into concrete which accounts for 7 percent of the weight of the cement, and then the concrete is stirred for 10 to 15 minutes, so that the water reducing rate of the concrete reaches 25 percent, the bleeding rate ratio is 0, and the water absorption ratio is 23 percent. The compressive strength ratios of the concrete in 3 days, 7 days and 28 days are 173%, 160% and 153% respectively, the penetration height ratio of the concrete is 28%, the water absorption ratio is 35%, the 5 hCl-electric flux is reduced from 1700C to 510C, and after the concrete is soaked and dried for 50 times by a saturated sodium sulfate solution, the strength loss rate is only 2.3%, and the weight loss rate is 0. .

Example 3

A preparation method of a concrete erosion-resistant agent comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

a plasticizer 3;

thioaluminate swelling agent 65;

sodium dodecyl sulfate 0.04;

sodium dodecyl benzene sulfonate 0.09;

60 parts of wollastonite;

0.2 of rust inhibitor;

light-burned magnesium oxide 9;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent, the wollastonite, the rust inhibitor and the light-burned magnesium oxide, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

The product of the invention is added into concrete which accounts for 6 percent of the weight of the cement, and then the mixture is stirred for 10 to 15min, so that the water reducing rate of the concrete reaches 18 percent, the bleeding rate ratio is 0, the water absorption ratio is 28 percent, the compressive strength ratios of the concrete for 3 days, 7 days and 28 days are 158 percent, 140 percent and 135 percent respectively, the penetration height ratio of the concrete is 33 percent, the water absorption ratio is 39 percent, the 5 hCl-electric flux is reduced from 1700C to 670C, after the concrete is soaked and dried for 50 times by saturated sodium sulfate solution, the strength loss rate is only 2.5 percent, and the weight loss rate is 0.

Example 4

A preparation method of a concrete erosion-resistant agent comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

2.5 of plasticizer;

thioaluminate swelling agent 75;

sodium dodecyl sulfate 0.1;

sodium dodecyl benzene sulfonate 0.05;

60 parts of wollastonite;

0.25 of rust inhibitor;

light-burned magnesium oxide 9;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent, the wollastonite, the rust inhibitor and the light-burned magnesium oxide, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

The product of the invention is added into concrete which accounts for 5 percent of the weight of the cement, and then the mixture is stirred for 10 to 15min, so that the water reducing rate of the concrete reaches 12 percent, the bleeding rate ratio is 0, the water absorption ratio is 32 percent, the compressive strength ratios of the concrete for 3 days, 7 days and 28 days are 135 percent, 128 percent and 113 percent respectively, the penetration height ratio of the concrete is 34 percent, the water absorption ratio is 40 percent, the 5 hCl-electric flux is reduced from 1700C to 770C, and after the concrete is soaked and dried for 50 times by saturated sodium sulfate solution, the strength loss rate is only 3 percent and the weight loss rate is 0.

Example 5

A preparation method of a concrete erosion-resistant agent comprises the following steps:

(1) preparing the following components in percentage by weight (Kg):

a silicon aluminum material 100;

a plasticizer 2;

thioaluminate swelling agent 75;

sodium dodecyl sulfate 0.1;

sodium dodecyl benzene sulfonate 0.05;

60 parts of wollastonite;

0.25 of rust inhibitor;

9.5 of light-burned magnesium oxide;

(2) putting the silicon-aluminum material, the rust inhibitor and the plasticizer into a dry powder mixer for mechanical mixing for 5-8 min;

(3) sequentially adding the expanding agent, the air entraining agent, the wollastonite, the rust inhibitor and the light-burned magnesium oxide, mechanically mixing for 10-15min, and uniformly mixing to obtain the concrete erosion-resistant agent.

The product of the invention is added into concrete which accounts for 5 percent of the weight of the cement, so that the working performance of the concrete can be effectively improved.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.