A super permeable concrete surface enhancer and its preparation method and application

Abstract

The present invention relates to a super-permeable concrete surface enhancer, a preparation method thereof, and an application thereof. The raw materials for preparing the super-permeable concrete surface enhancer include a dispersant, a fluorosilicate, a nano-oxide, an early strength agent, and water. The super-permeable concrete surface enhancer of the present invention not only has a good penetration effect, but also has a milder chemical reaction with the concrete surface and a longer action time when penetrating into the concrete surface. The concrete surface enhancer of the present invention is a multi-component chemical reagent with low viscosity. When applied by brushing or spraying on the concrete surface, it can quickly penetrate into the interior of the concrete, react with the by-products of cement hydration in the concrete, and generate a large amount of gel. These gels can block the capillary pores inside the concrete, thereby increasing the surface properties of the concrete, such as density, compressive strength, hardness, wear resistance, air tightness, impermeability, and carbonization resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a super-permeable concrete surface enhancer and a preparation method and application thereof. Background Art

[0002] In recent years, with the acceleration of my country's urbanization process, construction projects have become a focus of people's attention. At present, many domestic construction projects still have certain problems in the application of concrete construction technology during the construction process. Many construction projects have encountered a series of quality problems caused by poor application of concrete construction technology after production and operation, which cannot meet the society's requirements for construction project quality. In this case, construction units actively take effective measures to improve the overall level of concrete construction technology during the construction process of construction projects, so that the quality of the entire project can keep up, thereby meeting people's expectations and needs and promoting the development of construction project construction.

[0003] Surface treatment of concrete is a method that can effectively improve the durability and service life of concrete. Its main working principle is: utilizing the physical and chemical reaction between surface treatment agents, or the physical and chemical reaction between surface treatment agents and concrete, fillers such as CSH gel, AFt, and polymer compounds are generated in the microscopic defects and pores on the concrete surface to block the microscopic defects and pores on the concrete surface, making the concrete surface microstructure smoother and denser. Silicate-type and residual substances in concrete can generate calcium silicate, but a large amount of silicon dioxide in silicate will quickly hydrolyze into a film on the concrete surface, preventing further penetration of silicate. Therefore, the surface enhancer effect of the prior art is not very ideal.

[0004] Concrete surface enhancers are divided into single-component and multi-component types based on the reaction between the components. Since single-component concrete surface enhancers cannot be flexibly adjusted according to the actual use environment, and the components are complex and the reaction is uncontrollable, multi-component types currently have great development potential and have also received extensive attention from researchers in this field.

[0005] Chinese patent CN111170765A discloses a multi-component concrete surface enhancer, but the enhancer has poor permeability, which makes it easy for the concrete surface enhancer to become ineffective in some parts of the concrete. Therefore, we propose a super-permeable concrete surface enhancer. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a super permeable concrete surface enhancer and its preparation method and application.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a super permeable concrete surface enhancer, wherein raw materials for preparing the super permeable concrete surface enhancer include a dispersant, a fluorosilicate, a nano-oxide, an early strength agent, and water.

[0009] The ultra-permeable concrete surface enhancer of the present invention not only has a good penetration effect, but also penetrates into the concrete surface and the chemical reaction produced by the concrete is gentler and has a longer action time. The addition of a dispersant improves the dispersion effect and penetration of the concrete surface enhancer. The addition of fluorosilicate can effectively improve the durability of concrete. Nano-oxide can improve the strength, wear resistance and durability of concrete. Early strength agents can also improve the strength of concrete.

[0010] This concrete surface enhancer is a multi-component chemical reagent with low viscosity. When applied to the concrete surface by brushing or spraying, it can quickly penetrate into the concrete and react with the by-products of cement hydration in the concrete to generate a large amount of gel. These gels can block the capillary pores inside the concrete, thereby increasing the surface properties of the concrete, such as density, compressive strength, hardness, wear resistance, air tightness, impermeability and carbonization resistance.

[0011] Preferably, the raw materials for preparing the super permeable concrete surface enhancer include, by weight, 6-12 parts of dispersant, 5-10 parts of fluorosilicate, 3-7 parts of nano-oxide, 6-10 parts of early strength agent and water.

[0012] When combined in the above-mentioned specific mass ratio, the effect of improving the durability, wear resistance and compression resistance of the concrete surface can be maximized.

[0013] The mass parts of the dispersant can be selected from 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, etc.; the mass parts of the fluorosilicate can be selected from 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, etc.; the mass parts of the nano oxide can be selected from 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, etc.; the mass parts of the early strength agent can be selected from 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, etc. Other specific point values ​​within the above numerical range can be selected, and they will not be repeated here.

[0014] Preferably, the nano-oxide includes nano-silicon dioxide, nano-aluminum oxide and nano-calcium carbonate.

[0015] The present invention creatively discovers that nano silicon dioxide, nano aluminum oxide and nano calcium carbonate in the nano oxide have a certain synergistic effect in improving the durability, wear resistance and compressive strength of the concrete surface.

[0016] Preferably, the mass ratio of nano-silicon dioxide, nano-aluminum oxide and nano-calcium carbonate in the nano-oxide is (1-2):(1-2):(1.2-3).

[0017] The specific point values ​​in (1-2) can be selected as 1, 1.5, 2, etc., and the specific point values ​​in (1.2-3) can be selected as 1.2, 1.5, 1.8, 2, 2.5, 2.8, 3, etc. Other specific point values ​​within the above numerical range can be selected, so they will not be listed here one by one.

[0018] When combined in the above-mentioned specific mass ratio, the effect of improving the durability, wear resistance and compression resistance of the concrete surface can be maximized.

[0019] Preferably, the fluorosilicate includes any one of magnesium fluorosilicate, sodium fluorosilicate or potassium fluorosilicate, or a combination of at least two of them, preferably a combination of magnesium fluorosilicate and sodium fluorosilicate.

[0020] Magnesium fluorosilicate and sodium fluorosilicate in fluorosilicate have a certain synergistic effect in effectively improving the durability of concrete.

[0021] Fluorosilicates and nano-oxides also have a certain synergistic effect on the above-mentioned effects.

[0022] Preferably, the mass ratio of magnesium fluorosilicate to sodium fluorosilicate in the fluorosilicate is (1-2):(1-2), wherein the specific point values ​​in (1-2) can be selected from 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc. Other specific point values ​​within the above numerical range can be selected, and they will not be repeated here.

[0023] Preferably, the early strength agent includes any one of triethanolamine, glycerol or diethanolamine, or a combination of at least two of them.

[0024] The dispersant includes any one of polycarboxylate water reducer, oleic acid, stearic acid or cetyltrimethylammonium bromide or a combination of at least two thereof.

[0025] Preferably, the dispersant is a combination of a polycarboxylate water reducer and cetyltrimethylammonium bromide.

[0026] When the dispersant is a combination of polycarboxylate water-reducing agent and cetyltrimethylammonium bromide, the effect of enhancing the permeability of the concrete surface enhancer is the best, and the polycarboxylate water-reducing agent and cetyltrimethylammonium bromide have a certain synergistic effect.

[0027] Preferably, the mass ratio of the polycarboxylate water reducer and the cetyltrimethylammonium bromide in the dispersant is (1.5-2.5): (0.5-1.5), wherein the specific point values ​​in (1.5-2.5) can be selected from 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc., and the specific point values ​​in (0.5-1.5) can be selected from 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc. Other specific point values ​​within the above numerical range can be selected, and they will not be repeated here.

[0028] In a second aspect, the present invention provides a method for preparing the super permeable concrete surface enhancer according to the first aspect, the preparation method comprising: mixing a dispersant with water, and sequentially adding fluorosilicate, nano-oxide and an early strength agent to obtain the super permeable concrete surface enhancer.

[0029] In a third aspect, the present invention provides a use of the super permeable concrete surface enhancer according to the first aspect in concrete.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a concrete surface enhancer. This concrete surface enhancer not only has excellent penetration, but also produces a milder, longer-lasting chemical reaction with the concrete surface. This concrete surface enhancer is a multi-component chemical reagent with low viscosity. When applied by brushing or spraying on the concrete surface, it rapidly penetrates the concrete interior, reacting with cement hydration byproducts in the concrete to generate a large amount of gel. This gel can clog the concrete's capillary pores, thereby enhancing the concrete's surface properties, such as compactness, compressive strength, hardness, wear resistance, air tightness, impermeability, and carbonization resistance. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical means and effects adopted by the present invention, the technical solutions of the present invention are further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0033] The sources of the functional ingredients contained in the products involved in the following examples and comparative examples are as follows (only the functional ingredients are reflected, and the necessary auxiliary ingredients contained in other commercially available raw materials are not repeated):

[0034] The polycarboxylate water reducer was purchased from Guangzhou Jiyechangqing New Materials Co., Ltd. under the trade name of polycarboxylate water reducer jm04.

[0035] Nano-silica was obtained from a product called Nano-silica 20 nm purchased from MCC New Materials Company;

[0036] Nano-alumina was derived from a product purchased from MCC New Materials Co., Ltd. under the trade name Nano-alumina 20 nm;

[0037] Nano calcium carbonate was obtained from a product purchased from Yuanjiang Chemical Company under the trade name Nano calcium carbonate.

[0038] Example 1

[0039] This embodiment provides a super permeable concrete surface enhancer, which includes, by mass, 9 parts of polycarboxylate water reducer, 4 parts of magnesium fluorosilicate, 4 parts of sodium fluorosilicate, 1.5 parts of nano silicon dioxide, 1.5 parts of nano aluminum oxide, 3 parts of nano calcium carbonate, 8 parts of triethanolamine, and the balance water.

[0040] Its preparation method is:

[0041] The polycarboxylate water reducer is mixed with water, and magnesium fluorosilicate, sodium fluorosilicate, nano silicon dioxide, nano aluminum oxide, nano calcium carbonate and triethanolamine are added in sequence to obtain the product.

[0042] Example 2

[0043] This embodiment provides a super permeable concrete surface enhancer, which includes, by mass, 12 parts of a polycarboxylate water reducer, 2 parts of magnesium fluorosilicate, 3 parts of sodium fluorosilicate, 1 part of nano-silica, 1 part of nano-alumina, 2 parts of nano-calcium carbonate, 10 parts of glycerol, and the balance of water.

[0044] The preparation method is as in Example 1.

[0045] Example 3

[0046] This embodiment provides a super permeable concrete surface enhancer, which includes, by mass, 7 parts of polycarboxylate water reducer, 3 parts of magnesium fluorosilicate, 2 parts of sodium fluorosilicate, 2 parts of nano silicon dioxide, 2 parts of nano aluminum oxide, 3 parts of nano calcium carbonate, 7 parts of diethanolamine, and the balance of water.

[0047] The preparation method is as in Example 1.

[0048] Example 4

[0049] This embodiment provides a super permeable concrete surface enhancer, which differs from Example 1 only in that it does not contain magnesium fluorosilicate, and its reduced mass is distributed to the mass of sodium fluorosilicate, while other components and contents remain unchanged.

[0050] The preparation method is as in Example 1.

[0051] Example 5

[0052] This embodiment provides a super permeable concrete surface enhancer, which differs from Example 1 only in that it does not contain sodium fluorosilicate, and its reduced mass is distributed to the mass of magnesium fluorosilicate, while other components and contents remain unchanged.

[0053] The preparation method is as in Example 1.

[0054] Example 6

[0055] This embodiment provides a super permeable concrete surface enhancer, which differs from Example 1 only in that it does not contain nano-alumina, and its reduced mass is proportionally distributed to the mass of nano-silicon dioxide and nano-calcium carbonate, while other components and contents remain unchanged.

[0056] The preparation method is as in Example 1.

[0057] Example 7

[0058] This embodiment provides a super permeable concrete surface enhancer, which differs from Example 1 only in that it does not contain nano-silicon dioxide, and its reduced mass is proportionally distributed to the mass of nano-alumina and nano-calcium carbonate, while other components and contents remain unchanged.

[0059] The preparation method is as in Example 1.

[0060] Example 8

[0061] This embodiment provides a super permeable concrete surface enhancer, which differs from Example 1 only in that it does not contain nano-calcium carbonate, and its reduced mass is proportionally distributed to the mass of nano-alumina and nano-silicon dioxide, while other components and contents remain unchanged.

[0062] The preparation method is as in Example 1.

[0063] Example 9

[0064] This embodiment provides a super permeable concrete surface enhancer, which includes, by mass, 6 parts of polycarboxylate water reducer, 3 parts of cetyltrimethylammonium bromide, 4 parts of magnesium fluorosilicate, 4 parts of sodium fluorosilicate, 1.5 parts of nano-silica, 1.5 parts of nano-alumina, 3 parts of nano-calcium carbonate, 8 parts of triethanolamine, and the balance water.

[0065] The preparation method is as in Example 1.

[0066] Example 10

[0067] This embodiment provides a super permeable concrete surface enhancer, which includes, by mass, 9 parts of cetyltrimethylammonium bromide, 4 parts of magnesium fluorosilicate, 4 parts of sodium fluorosilicate, 1.5 parts of nano-silicon dioxide, 1.5 parts of nano-alumina, 3 parts of nano-calcium carbonate, 8 parts of triethanolamine, and the balance water.

[0068] The preparation method is as in Example 1.

[0069] Comparative Example 1

[0070] This comparative example provides a concrete surface enhancer, which differs from Example 1 only in that it does not contain magnesium fluorosilicate and sodium fluorosilicate, and the reduced mass thereof is proportionally distributed to the mass of nano-silicon dioxide, nano-alumina and nano-calcium carbonate, while the other components and contents remain unchanged.

[0071] The preparation method is as in Example 1.

[0072] Comparative Example 2

[0073] This comparative example provides a concrete surface enhancer, which differs from Example 1 only in that it does not contain nano-silicon dioxide, nano-aluminum oxide, and nano-calcium carbonate, and the reduced mass thereof is proportionally distributed to the mass of magnesium fluorosilicate and sodium fluorosilicate, while the other components and contents remain unchanged.

[0074] The preparation method is as in Example 1.

[0075] Test Example 1

[0076] Concrete surface enhancer effect detection:

[0077] The concrete used is of the same grade C40, and the specific formula is:

[0078] Conch PO42.5 cement was used, and the concrete mix ratio was: cement: fly ash: sand: gravel: water = 320:130:750:1160:175. The water reducer dosage was 0.15% (in terms of solid content) of the cementitious material.

[0079] Equal amounts of the super permeable concrete surface enhancers described in Examples 1-10 and Comparative Examples 1-2 were sprayed onto the surface of the concrete specimens. The test method was as follows:

[0080] Rebound value: refer to the standard method of "Technical Specification for Testing Concrete Compressive Strength by Rebound Method" JGJ / T23-2001 to test the rebound value of 28d concrete specimens.

[0081] Durability test: Concrete specimens were cut into 100mm diameter and 50mm height specimens. Chloride ion permeability was tested according to the standard GB / T50082-2009, "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete." Chloride ion permeability indicates the rate at which chloride ions penetrate the concrete, expressed as the chloride ion diffusion coefficient.

[0082] Abrasion resistance test: Abrasion resistance refers to the wear resistance a material can withstand when worn to a certain depth. A higher abrasion resistance value indicates better wear resistance. The test specimen size is 100mm x 100mm x 100mm, as per GB / T 16925-1997, "Test method for abrasion resistance of concrete and its products."

[0083] Table 1

[0084] Group Rebound value (MPa) <![CDATA[90-day chloride ion diffusion coefficient (×10 -12 m 2 / s)]]> wear resistance Example 1 48.2 1.323 4.3 Example 2 44.8 1.426 4.1 Example 3 45.2 1.534 4.0 Example 4 46.3 1.398 4.1 Example 5 47.1 1.403 3.9 Example 6 46.3 1.426 3.7 Example 7 47.6 1.468 3.5 Example 8 45.9 1.501 3.3 Example 9 50.3 1.245 4.6 Example 10 48.5 1.301 4.4 Comparative Example 1 42.1 1.587 3.1 Comparative Example 2 43.2 1.602 3.2

[0085] As can be seen from the data in Table 1, the ultra-permeable concrete surface enhancer of the present invention has strong compressive strength, durability, and wear resistance. The present invention creatively discovered that fluorosilicates and nano-oxides have a certain synergistic effect in achieving the above-mentioned effects, that sodium fluorosilicate and magnesium fluorosilicate in the fluorosilicates have a certain synergistic effect, and that nano-silica, nano-alumina, and nano-calcium carbonate in the nano-oxides have a certain synergistic effect. The addition of a dispersant improves the permeability of the concrete surface enhancer, and that polycarboxylate water reducer and cetyltrimethylammonium bromide have a certain synergistic effect in achieving the above-mentioned effects.

[0086] The applicant declares that the present invention uses the above-described embodiments to illustrate the ultra-permeable concrete surface enhancer, its preparation method, and its application. However, the present invention is not limited to the above-described embodiments, nor does it necessarily rely on the above-described embodiments for implementation. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for various raw materials in the present invention, addition of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

[0087] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A super permeable concrete surface enhancer, characterized in that: The raw materials for preparing the super permeable concrete surface enhancer include, by weight, 6-12 parts of a dispersant, 5-10 parts of a fluorosilicate, 3-7 parts of a nano-oxide, 6-10 parts of an early strength agent, and water; Wherein, the nano-oxide is a combination of nano-silicon dioxide, nano-aluminum oxide and nano-calcium carbonate; The mass ratio of nano-silicon dioxide, nano-aluminum oxide and nano-calcium carbonate in the nano-oxide is (1-2):(1-2):(1.2-3); The fluorosilicate is a combination of magnesium fluorosilicate and sodium fluorosilicate; The mass ratio of magnesium fluorosilicate to sodium fluorosilicate in the fluorosilicate is (1-2):(1-2); The dispersant is a combination of a polycarboxylate water reducer and cetyltrimethylammonium bromide; The mass ratio of the polycarboxylate water reducer to cetyltrimethylammonium bromide in the dispersant is (1.5-2.5):(0.5-1.5).

2. The super permeable concrete surface enhancer according to claim 1, characterized in that: The early strength agent includes any one of triethanolamine, glycerol or diethanolamine, or a combination of at least two of them.

3. The method for preparing the super permeable concrete surface enhancer according to claim 1 or 2, wherein: The preparation method comprises the following steps: mixing a dispersant with water, and then sequentially adding fluorosilicate, nano-oxide and an early strength agent to obtain the product.

4. Use of the super permeable concrete surface enhancer according to claim 1 or 2 in concrete.