A construction process for large-area outdoor imitation fair-faced concrete coating

Abstract

This invention discloses a construction process for outdoor large-area imitation fair-faced concrete coating, specifically including the following steps: Step 1: Material preparation; Step 2: Color matching, using the base material as a color diluent, and using gray I and gray II as dyeing materials, adjusting the imitation fair-faced concrete color effect by adding diluent to the dyeing materials; Step 3: Cleaning and repairing the substrate to be sprayed; Step 4: Applying imitation fair-faced paint A to the substrate treated in Step 3 for the first spraying, and then applying imitation fair-faced paint B to the substrate after the first spraying, so that the substrate color blends with the color effects of each layer of imitation fair-faced paint A and imitation fair-faced paint B, and dilutes the decorative traces brought by the color, obtaining a fresh and natural imitation fair-faced concrete color and texture effect; Step 5: Applying a transparent protective topcoat.

Description

Technical Field

[0001] This invention relates to the field of concrete surface decoration technology, specifically to a construction process for outdoor large-area imitation fair-faced concrete coating. Background Technology

[0002] Concrete is widely used as one of the main building materials for tunnels. Among the many concrete coatings on the market, the imitation fair-faced concrete coating process is increasingly favored by customers due to its advantages such as fresh and natural appearance, no obvious decorative traces, and the ability to effectively adjust and cover various color defects in the original concrete base during the pouring process.

[0003] Currently, the market for imitation clear water coating mainly includes two types: simple imitation clear water process and textured (painted) imitation clear water process. The simple imitation clear water process generally employs a "base layer repair + color adjustment + topcoat protection" construction technique. Its core control points are: 1. Using cement slurry (or other cement-based repair materials) as the repair material, which plays a role in leveling the base surface and unifying the base color during the base layer repair process; 2. Selecting imitation clear water color paint during the color adjustment stage to further adjust the color of the repaired base surface. The advantage of this technique is that the construction process is not significantly different from conventional coating processes, making it simple and efficient; however, the disadvantage is that it is difficult to achieve a fresh and natural color effect, generally resulting in a single color and noticeable decorative traces. The "patting and pulling" imitation fair-faced paint process generally employs techniques such as "base repair + patting (pulling) + color matching + topcoat protection." Its core control points are: 1. Using cement slurry as a repair material, it plays a role in leveling the base surface and unifying the base color during the base repair process; 2. Using color matching material to pat (pull) the base surface, creating irregular patterns; 3. Applying a second color matching material to the entire base surface, adjusting the overall base color and blending it with the patting (pulling) colors to highlight the overall imitation fair-faced effect. The advantages of this process are natural and fresh patterns and layered colors, generally reproducing the imitation fair-faced artistic effect very well. However, the disadvantages are: First, the colors still have a certain stiffness; although several colors can present a good sense of layering and pattern effects, there are still some traces of artistic processing; Second, it is more suitable for interior decoration. For large-area outdoor construction, the work efficiency is relatively slow, resulting in higher construction costs. Considering the advantages and disadvantages of the commonly used concrete imitation fair-faced concrete coating processes mentioned above, the current outdoor large-area imitation fair-faced concrete coating process has problems such as heavy decorative traces, slow work efficiency, and high cost. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a construction process for outdoor large-area imitation fair-faced concrete coating, so as to solve the problems of heavy decorative traces, slow work efficiency and high cost in the existing outdoor large-area imitation fair-faced concrete coating process.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A construction process for large-area outdoor imitation fair-faced concrete coating includes the following steps:

[0007] Step 1: Prepare materials. Select imitation clear paint A and imitation clear paint B. The color of imitation clear paint B is darker than that of imitation clear paint A. Imitation clear paint A consists of a base material, gray I, and gray II; imitation clear paint B consists of a base material, gray III, and gray IV.

[0008] The base material, calculated by weight percentage, comprises 30-50% emulsion, 30-50% fine filler, 5-10% film-forming agent, 2-6% dispersant, and an acceptable amount of water;

[0009] The gray I, calculated by weight percentage, comprises 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water. An appropriate amount of pigment paste is added to achieve the color of color number N8.25; the color number used is the Chinese national standard color card for building materials. The amount of pigment paste added is based on achieving the desired color-matching effect and is not specified in a specific proportion. In this invention, the pigment paste is added in batches multiple times after the coating is prepared until the desired color effect is achieved, and the amount of pigment paste used is not the focus of this invention.

[0010] The gray II, calculated by weight percentage, contains 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water, with an appropriate amount of color paste added to achieve the color of color number N7.25.

[0011] The gray III, calculated by mass percentage, contains 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water, with an appropriate amount of color paste added to achieve the color of color number N4.25.

[0012] The gray IV, by weight percentage, contains 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water, with an appropriate amount of color paste added to achieve the color of N7.75.

[0013] Step 2: Color matching. Use the base material as a diluent to lighten the color, and use gray I and gray II as dyeing materials. Adjust the color effect of imitation Qing A by adding diluent to the dyeing materials. Use the base material as a diluent to lighten the color, and use gray III and gray IV as dyeing materials. Adjust the color effect of imitation Qing B by adding diluent to the dyeing materials.

[0014] Step 3: Clean and repair the substrate to be sprayed.

[0015] Step 4: Apply the imitation clear paint A to the substrate treated in Step 3 using an airless sprayer for the first coat, ensuring a uniform and thin spray. The paint consumption is 0.25-0.35 kg / m². 2 Then, based on this, a second coat of imitation clear paint B is applied to the substrate after the first coat, with a consumption of 0.05-0.15 kg / m². 2 This allows the base color to blend seamlessly with the colors of the imitation clear concrete coatings A and B, while minimizing decorative traces and achieving a fresh and natural imitation clear concrete color and texture effect.

[0016] Step 5: Apply 1-2 coats of clear protective topcoat by spraying or rolling, with a consumption of 0.2-0.3 kg / m². 2 The transparent protective topcoat comprises the following raw materials by weight percentage: 60-90% emulsion, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water.

[0017] Preferably, the emulsion is an acrylic emulsion / or a modified acrylic emulsion.

[0018] Preferably, the fine filler is heavy calcium carbonate.

[0019] Preferably, the film-forming aid is an alcohol-based solvent.

[0020] Preferably, the dispersant is sodium dodecyl sulfate.

[0021] Preferably, in step 4, when performing the first spraying, a cross-spraying method is used, the nozzle of the spray gun is controlled to be 40-60cm away from the substrate, and the coverage is 50-70%.

[0022] Preferably, in step 4, when performing the second spraying, a cross-spraying method is used, the nozzle of the spray gun is controlled to be 40-60cm away from the substrate, and the coverage is 10-20%.

[0023] Preferably, according to mass percentage, in the imitation clear coating A, the ratio of base material, gray I and gray II is (90-98):(1-10):(1-10); in the imitation clear coating B, the ratio of base material, gray III and gray IV is (90-98):(1-10):(1-10).

[0024] Preferably, in step 5, the transparent protective topcoat is applied by spraying or rolling 1-2 coats.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The construction process described in this invention is particularly suitable for large-area outdoor imitation fair-faced concrete coating. It can be applied directly to conventional concrete substrates after cleaning. No special treatment is required for defects in the substrate color, and it does not affect the final imitation fair-faced coating effect. If the concrete substrate needs to be repaired, conventional cement-based repair materials can be used for repair without affecting the final imitation fair-faced coating effect. This avoids the situation where some manufacturers use cement directly for repair in order to pursue the consistency of repair material with the original substrate color. Direct use of cement for repair is prone to cracking, powdering, and peeling, leading to the detachment of the entire system.

[0027] 2. Existing technologies often involve directly diluting the color with water, which not only affects the anti-corrosion protection function of the coating but also changes the consistency of the paint, affecting its workability and the final effect. If a lighter-colored paint is used directly, it cannot achieve the purpose of blending with other colors, and obvious decorative marks are often left after the treatment. The process described in this invention uses two different colored imitation clear paints for dilution treatment, allowing each color-correcting layer to blend with the base color, presenting a random and natural texture and color, without the need for patting or striping treatment.

[0028] 3. The construction process described in this invention effectively solves the problems of heavy decorative marks, slow efficiency, and high cost in the current outdoor large-area imitation fair-faced concrete coating process. After coating, the imitation fair-faced concrete coating has a fresh and natural appearance, is simple to construct, has high efficiency, and low cost, and has a very good application prospect. Attached Figure Description

[0029] Figure 1 This is a distant view of the construction effect after Example 11.

[0030] Figure 2 This is a close-up view of the construction effect after Example 11.

[0031] Figure 3 This is a close-up view of the construction results for Comparative Example 1.

[0032] Figure 4 This is a close-up view of the construction results for Comparative Example 2.

[0033] Figure 5 This is before the partial repair work in Example 17.

[0034] Figure 6 This is after the partial repair work in Example 17.

[0035] Figure 7 The images show the results after partial repairs to the damage observed in Comparative Examples 1 and 2. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Examples 1-3: Prepare materials according to the table below (the amount of colorant added is based on achieving the desired color mixing effect and is not shown separately as a proportion, the same applies below):

[0038] Table 1. Base Material (Unit: %)

[0039] Components lotion Fine packing Film-forming aids dispersant water Example 1 30 40 8 6 16 Example 2 40 35 6 4 15 Example 3 50 30 5 2 13

[0040] Table 2 Gray I (Unit: %)

[0041] Components lotion Fine packing Titanium dioxide Film-forming aids dispersant water Example 1 30 20 15 10 6 19 Example 2 40 15 20 8 4 13 Example 3 50 10 25 6 2 7

[0042] Table 3 Gray II (Unit: %)

[0043] Components lotion Fine packing Titanium dioxide Film-forming aids dispersant water Example 1 30 20 15 10 6 19 Example 2 40 15 20 8 4 13 Example 3 50 10 25 6 2 7

[0044] Table 4 Gray III (Unit: %)

[0045] Components lotion Fine packing Titanium dioxide Film-forming aids dispersant water Example 1 30 20 15 10 6 19 Example 2 40 15 20 8 4 13 Example 3 50 10 25 6 2 7

[0046] Table 5 Gray IV (Unit: %)

[0047] Components lotion Fine packing Titanium dioxide Film-forming aids dispersant water Example 1 30 20 15 10 6 19 Example 2 40 15 20 8 4 13 Example 3 50 10 25 6 2 7

[0048] Table 6 Imitation Clear Coating A (Unit: %)

[0049] Components base material Gray I Grey II Example 1 96 2 2 Example 2 94 3 3 Example 3 92 4 4

[0050] Table 7 Imitation Clear Coating B (Unit: %)

[0051] Components base material Gray I Grey II Example 1 96 2 2 Example 2 94 3 3 Example 3 92 4 4

[0052] Example 11

[0053] The specific steps are as follows:

[0054] Step 1: Prepare materials according to Tables 1-7;

[0055] The base material, by weight percentage, is: 30% emulsion, 40% fine filler, 8% film-forming aid, 6% dispersant, and 16% water;

[0056] Gray I, by mass percentage, consists of: 30% emulsion, 20% fine filler, 15% titanium dioxide, 10% film-forming aid, 6% dispersant, and 19% water. An appropriate amount of color paste is added to achieve the color of N8.25 (China National Standard Color Card for Building Construction).

[0057] Gray II, by weight percentage, comprises: 30% emulsion, 20% fine filler, 15% titanium dioxide, 10% film-forming aid, 6% dispersant, and 19% water, with an appropriate amount of color paste added to achieve the color of N7.25 (China National Standard Color Card for Building Construction).

[0058] Gray III, calculated by weight percentage, includes: 30% emulsion, 20% fine filler, 15% titanium dioxide, 10% film-forming aid, 6% dispersant, and 19% water, with an appropriate amount of color paste added to achieve the color of N4.25 (China National Standard Color Card for Building Construction).

[0059] Gray IV, calculated by weight percentage, includes: 30% emulsion, 20% fine filler, 15% titanium dioxide, 10% film-forming aid, 6% dispersant, and 19% water, with an appropriate amount of color paste added to achieve the color of N7.75 (China National Standard Color Card for Building Construction).

[0060] Step 2: Color matching. Use the base material as a color diluent and use gray I and gray II as dyeing materials. Adjust the imitation Qing A color effect by adding diluent to the dyeing materials. The material ratio can be adjusted within a certain range according to the color of the base concrete and the customer's preference. The ratio is base material (96%), gray I (2%), and gray II (2%).

[0061] The base material is used as a color dilution material, and gray III and gray IV are used as dyeing materials. The color effect of imitation Qing B is adjusted by adding diluent to the dyeing material. The material ratio can be adjusted within a certain range according to the color of the base concrete and the customer's preference. The ratio is base material (96%), gray III (2%), and gray IV (2%).

[0062] The transparent protective topcoat comprises the following raw materials by weight percentage: 85% emulsion, 10% film-forming aid, 5% dispersant, and an acceptable amount of water;

[0063] Step 3: Clean and repair the substrate to be sprayed;

[0064] Step 4: Apply a first coat of imitation clear concrete paint A to the substrate treated in Step 3. Then, apply a second coat of imitation clear concrete paint B to the substrate after the first coat, allowing the colors of the substrate to blend and fade with those of the imitation clear concrete paints A and B, achieving a simulated fair-faced concrete effect. During the first coat, use a cross-hatching technique, keeping the nozzle 40-60cm away from the substrate, and achieving 50-70% coverage. Coverage is controlled primarily by combining paint consumption and visual observation of the substrate's transparency. The paint consumption is controlled at 0.25-0.35 kg / m². 2 The coating must be applied evenly. After the first coat, allow it to cure naturally for at least 4-6 hours before applying the second coat. Before the first coat, ensure the substrate is clean and dry. The application temperature should be 5-45℃, humidity <80%, and application is prohibited in inclement weather such as rain or snow.

[0065] For the second coat, use a cross-hatching technique, keeping the nozzle 40-60cm from the substrate and achieving 10-20% coverage. Coverage is controlled primarily through a combination of paint consumption and visual inspection to ensure the coating shows through. Paint consumption is controlled at 0.05-0.15 kg / m². 2 The coating must be applied evenly. Before the second coat, the substrate should be checked to ensure it is clean and dry. The application temperature should be between 5-45℃, and the humidity should be <80%. Application is prohibited in inclement weather such as rain or snow.

[0066] Step 5: After the second coat, allow the surface to cure naturally for at least 4-6 hours before applying the clear protective topcoat. Apply 1-2 coats of clear protective topcoat by spraying or rolling, with a consumption of 0.2-0.3 kg / m². 2 .

[0067] Table 8 Material System Matching

[0068] base material Gray I Grey II Gray III Gray IV Imitation Qing A Imitation Qing Dynasty B Example 11 Example 1 Example 1 Example 1 Example 1 Example 1 Example 1 Example 1 Example 12 Example 2 Example 2 Example 2 Example 2 Example 2 Example 2 Example 2 Example 13 Example 3 Example 3 Example 3 Example 3 Example 3 Example 3 Example 3 Example 14 Example 1 Example 2 Example 2 Example 2 Example 2 Example 3 Example 3 Example 15 Example 2 Example 3 Example 3 Example 3 Example 3 Example 1 Example 1 Example 16 Example 3 Example 1 Example 1 Example 1 Example 1 Example 2 Example 2

[0069] Note: The transparent protective topcoat uses a standardized material formula and is applied by spraying or rolling.

[0070] Examples 11-16 follow the specific steps of Example 11, using the materials of Examples 1-3, and are matched according to the material system in Table 8. The amounts of base material, gray I, gray II, gray III, gray IV, imitation clear A, and imitation clear B are the same as in Example 11. The substrate to be sprayed is treated with imitation clear water construction.

[0071] Example 17

[0072] After the simulated fair-faced finish treatment in Example 11, surface damage occurred. In this case, the loose parts of the damaged area should be cleaned first. Depending on the size of the defect, repair materials should be applied in layers for repair. After repair, cement-based repair materials should be used to level the surface, followed by curing. Then, following steps 4-5 in Example 11, simulated fair-faced finish treatment should be applied to the repaired area. The simulated fair-faced finish color-corrected area should extend slightly beyond the defect area, overlapping to some extent with the undamaged area. Because the simulated fair-faced finish treatment method of this invention itself creates a certain natural texture, and the color correction is lightened to avoid a heavy decorative hue, the simulated fair-faced finish color-corrected area after defect repair will not show a significant difference in appearance from the undamaged area.

[0073] Figure 5 Before the construction of the simulated fair-faced water feature for partial repairs. Figure 6 The image shows a partial repair using the fair-faced concrete technique described in this invention. A comparison reveals that the resulting partial repair exhibits a concrete texture, seamlessly integrating with adjacent concrete sections without noticeable differences or transitional marks.

[0074] Comparative Example 1: Simplified Imitation Water Process

[0075] Step 1: Material preparation. Gray I is composed of the following by weight percentage: emulsion 30%, fine filler 20%, titanium dioxide 15%, film-forming aid 10%, dispersant 6%, and water 19%. The preferred color is N8.25 (China National Standard Color Card for Building).

[0076] Step 2: Clean the substrate to be sprayed and repair it with cement slurry (or other cement-based repair materials);

[0077] Step 3: Apply gray I by spraying or rolling, two coats, controlling the total consumption to 0.3-0.4 kg / m². 2 The requirement is to apply the coating evenly and achieve full coverage of the base color.

[0078] Step 4: Apply 1-2 coats of clear protective topcoat by spraying or rolling, with a consumption of approximately 0.2-0.3 kg / m². 2 .

[0079] Comparative Example 2: Imitation Clear Water Process

[0080] An improvement on Example 11 is made, but the difference lies in the following: a process of "base repair + patterning + color correction + topcoat protection" is used for the imitation clear water treatment. Specifically, cement slurry is first used as a repair material to level the base surface and unify the color of the base surface during the base repair process; then, imitation clear color A (dark color) is used to create irregular patterns by patting and drawing patterns on the base surface. This step needs to be repeated multiple times as needed. Finally, imitation clear color B (light color) is applied to the base surface to adjust the overall color of the base surface and blend it with the patting (drawing) color.

[0081] After the substrate surface was damaged following the application of the "painted pattern" imitation clear water finish process, the damaged area was repaired, and cement grout was used as the repair material. The surface color was then treated according to the "painted pattern" imitation clear water finish process. However, the color in this process relies on the texture created by the fusion of cement grout and two imitation clear water finish colors. After the repair and color matching are completed, the damaged area will have a certain difference in appearance between the old and new areas.

[0082] Figure 7 When damage occurs in Comparative Example 1 or Comparative Example 2 (the appearance defects are similar in these two cases), after repairing and color-matching using the process of Comparative Example 1 or Comparative Example 2, a significant color difference appears between the repaired area and the surrounding area, affecting the appearance quality.

[0083] Comparative Example 3

[0084] An improvement was made based on Example 11, the difference being that: no base material was used for color matching, and when adjusting the colors of gray I, gray II, gray III and gray IV, water was added directly for color matching, and then the construction method of Example 1 was used for water treatment.

[0085] Comparative Example 4

[0086] An improvement was made based on Example 11, but the difference is that no base material was used for color matching. Instead, gray pigments of different shades were selected according to the Chinese national standard color card for building materials, and various corresponding coatings were prepared. The construction method of Example 1 was used to perform a simulated fair-faced finish.

[0087] Comparative Example 5

[0088] An improvement on Example 11 is made in that, after the first coat is applied, a second coat is applied directly before the first coat is completely dry. All other steps are the same as in Example 1.

[0089] Table 9 Comparison of different Qing Dynasty imitation processes in Example 11 and Comparative Examples 1-2

[0090]

[0091] Referring to the testing methods in the standards for "Synthetic Resin Emulsion Exterior Wall Coatings" and "Cross-linked Fluoropolymer Coatings", the material properties of Examples 11-16 and Comparative Examples 1-4 were tested, and the test results are as follows:

[0092] Table 10 Material Performance Test Results

[0093]

[0094] (1) In this invention, all embodiments can achieve excellent Qing-style simulation effects under conditions of high efficiency and low cost. Figure 1 For viewing from a distance, Figure 2 For a closer look, from Figure 1 As can be seen from a distance, it is not significantly different from the original concrete, with an overall light gray color and subtle, indistinct textures in some areas. It also eliminates color defects such as water ripples that occur during concrete pouring. Figure 2 As can be seen upon close inspection, the base concrete color is visible to a certain extent, the first sprayed imitation clear color A is visible to a certain extent, and the surface layer is a loosely and evenly distributed imitation clear color B. The three colors blend together and dilute the decorative traces brought by the colors, resulting in a fresh and natural imitation clear concrete color and texture effect.

[0095] (2) Compared with Example 11, although the construction cost and efficiency are the same, the imitation clean effect of Comparative Example 1 is worse. After construction, the overall appearance color of Comparative Example 1 is completely uniform, light gray, and does not have the unique texture of concrete, resulting in very obvious decorative marks after treatment. The imitation clean effect is much worse than that of Example 11. This can be seen from the fact that... Figure 3 This can also be seen in the text. Figure 3 The photo shows the completed version of the simplified concrete-look finish (Comparative Example 1). It can be seen that the overall appearance of Comparative Example 1 is uniformly light gray, completely lacking the texture characteristic of concrete. The monochromatic color creates obvious decorative marks. Figure 1 , Figure 2 The effect is significantly inferior compared to the Qing dynasty style.

[0096] (3) Compared with Comparative Example 2 and Example 11, both have a very good imitation effect, from Figure 4 As can be seen, Comparative Example 2 has a very good texture mechanism, but its construction cost is high and its construction efficiency is very low. This is mainly because Comparative Example 2 requires special patting and pulling treatments, which need to be repeated multiple times and can only be done manually to achieve the imitation water effect. This makes the construction efficiency of Comparative Example 2 far lower than that of Example 11. Moreover, Comparative Example 2 is generally suitable for indoor use, and its overall material has poor weather resistance, stain resistance, and acid and alkali resistance.

[0097] (4) Compared with Comparative Examples 3 and 4, Comparative Examples 4 and Example 11, Comparative Example 3 directly diluted the color by adding water, which reduced the content of other components in the coating, made the coating thinner, and had poorer adhesion. During weathering construction, the coating needed to be sprayed multiple times to adhere to the substrate. The color of the coating on the substrate floated on the surface, and the imitation water effect was also very poor, with obvious decorative marks. At the same time, the performance of the coating in Comparative Example 3 also decreased significantly after construction. A series of properties such as water resistance, alkali resistance, acid resistance, and hardness all decreased to varying degrees. Comparative Example 4 used gray pigments of different shades for construction, which led to a significant increase in construction costs. Moreover, the different shades of gray pigments had very poor blending between different colors of coating during construction, and the decorative marks after treatment were as obvious as in Comparative Example 1.

[0098] (5) Compared with Example 11, Comparative Example 5 has a similar imitation clear water effect. However, since the surface of the first sprayed coating was not cured to dry when Comparative Example 5 was sprayed for the second time, spraying for a similar period of time will cause flow marks to form on the surface, resulting in appearance defects. These appearance defects will not only damage the decorative effect, but also affect the final imitation clear water effect.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A construction process for large-area outdoor imitation fair-faced concrete coating, characterized in that, Specifically, the steps include the following: Step 1: Prepare materials. Select imitation clear paint A and imitation clear paint B. The color of imitation clear paint B is darker than that of imitation clear paint A. Imitation clear paint A consists of a base material, gray I, and gray II; imitation clear paint B consists of a base material, gray III, and gray IV. The base material, calculated by weight percentage, comprises 30-50% emulsion, 30-50% fine filler, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water; The gray I, by weight percentage, comprises 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water; The gray II, by weight percentage, comprises 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water; The gray III, by weight percentage, comprises 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water; The gray IV, by mass percentage, comprises 30-50% emulsion, 10-20% fine filler, 15-25% titanium dioxide, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water; Step 2: Color matching. Use the base material as a diluent to lighten the color, and use gray I and gray II as dyeing materials. Adjust the color effect of the imitation Qing paint A by adding diluent to the dyeing materials. Use the base material as a diluent to lighten the color, and use gray III and gray IV as dyeing materials. Adjust the color effect of the imitation Qing paint B by adding diluent to the dyeing materials. Step 3: Clean and repair the substrate to be sprayed; Step 4: Apply the imitation clear paint A to the substrate treated in Step 3 using an airless sprayer for the first coat, ensuring a uniform and thin spray. The paint consumption is 0.25-0.35 kg / m². 2 Then, based on this, a second coat of imitation clear paint B is applied to the substrate after the first coat, with a consumption of 0.05-0.15 kg / m². 2 This allows the base color to blend with the color effects of the imitation clear paint A and imitation clear paint B, and to soften the decorative traces brought by the colors, thereby achieving the color and texture effect of imitation fair-faced concrete. Step 5: Apply 1-2 coats of clear protective topcoat by spraying or rolling, with a consumption of 0.2-0.3 kg / m². 2 The transparent protective topcoat comprises the following raw materials by weight percentage: 60-90% emulsion, 5-10% film-forming aid, 2-6% dispersant, and an acceptable amount of water. According to the mass percentage calculation, in imitation Qing paint A, the ratio of base material, gray I and gray II is (90~98):(1~10):(1~10); in imitation Qing paint B, the ratio of base material, gray III and gray IV is (90~98):(1~10):(1~10). The emulsion is a modified acrylic emulsion.

2. The construction process for outdoor large-area imitation fair-faced concrete coating according to claim 1, characterized in that, The fine filler is heavy calcium carbonate.

3. The construction process for outdoor large-area imitation fair-faced concrete coating according to claim 1, characterized in that, The film-forming aid is an alcohol-ester solvent.

4. The construction process for outdoor large-area imitation fair-faced concrete coating according to claim 1, characterized in that, The dispersant is sodium dodecyl sulfate.

5. The construction process for outdoor large-area imitation fair-faced concrete coating according to claim 1, characterized in that, In step 4, when spraying for the first time, a cross-spraying method is used, and the nozzle of the spray gun is kept 40-60cm away from the substrate, with a coverage of 50-70%. After the first spraying is completed, the substrate should be naturally cured for at least 4-6 hours before the second spraying is applied. The temperature for the first spraying is 5-45℃ and the humidity is <80%.

6. The construction process for outdoor large-area imitation fair-faced concrete coating according to claim 1, characterized in that, In step 4, when applying the second coat, a cross-spraying technique is used, keeping the nozzle of the spray gun 40-60cm away from the substrate and ensuring 10-20% coverage. After the second coat is applied, the substrate should be allowed to cure naturally for at least 4-6 hours before applying the transparent protective topcoat. The temperature for the second coat application should be 5-45℃, and the humidity should be <80%.

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