Color concrete aging test method

Abstract

The invention provides a color concrete aging test method, and relates to material determination. The color concrete aging test method comprises the following steps: dividing the whole year into spring, summer, autumn and winter according to historical meteorological data of a target area; various parameters of the target area are determined through statistical analysis; distributing the total ultraviolet radiation duration T1 according to the sunshine duration proportion of each quarter; the total pure water soaking duration T2 is distributed according to the rainfall duration proportion of each quarter; distributing the total drying and irradiation-free duration T3 according to the rainfall distribution of each quarter; each parameter is mapped to a 24-hour cycle period every day in proportion, four groups of time sequence combinations in spring, summer, autumn and winter are formed, and the number Di of test days in each season is calculated; and constructing a year-round equivalent test period, and sequentially executing the cyclic sequence. According to the method, various parameters are calculated through the historical meteorological data of the target area, and on the basis of ultraviolet radiation, rainfall and temperature changes are increased, so that the simulation authenticity is improved, and the color durability of the colored concrete is accurately evaluated.

Description

Technical Field

[0001] The present application relates to the field of material determination, and more particularly, to a method for aging test of colored concrete. Background Art

[0002] Colored concrete is a building material that integrates functions and decoration. With the characteristics of rich colors, environmental protection and convenient construction, it has been widely used in domestic and foreign building decoration projects in recent years. However, when colored concrete is exposed to the outdoor environment for a long time, the surface color will gradually fade with the increase of exposure time. Under the sunlight irradiation in the natural environment, the molecular structure of organic pigments will be affected by factors such as ultraviolet radiation, heat, and relative humidity of the air. The high ultraviolet radiation intensity causes the chemical bonds in the molecular structure to break and the anti-ultraviolet aging performance to decline, resulting in deterioration phenomena such as fading and discoloration of colored concrete; temperature and humidity will cause the soluble alkalis inside the colored concrete to migrate along the capillary pores to the concrete surface with the evaporation of water and react with carbon dioxide in the air, resulting in the formation of white substances on the concrete surface.

[0003] In order to evaluate the service life of the color durability and decorative effect of colored concrete, indoor aging simulation is often required. The most important test condition factors are ultraviolet irradiation, temperature and humidity. Therefore, ultraviolet irradiation, temperature and humidity are selected as the environmental factors for indoor accelerated aging when simulating outdoor ultraviolet aging. To improve the anti-ultraviolet aging performance of colored concrete, a protective agent is usually applied to the surface of colored concrete to prevent water infiltration and inhibit ultraviolet aging. After the coating is cured, an indoor simulated ultraviolet experiment is carried out to evaluate the effectiveness of the protective agent.

[0004] Most current indoor ultraviolet aging tests use continuous, short-time, high-intensity ultraviolet irradiation. Although this method can shorten the material aging test time, it will cause the rapid destruction of the surface structure of the protective agent to form a thin film; secondly, due to the inconsistent aging rates of the aged part and the unaged part of the thin film, the aging process is asynchronous. This non-uniform aging effect does not conform to the actual ultraviolet aging situation. In addition, after the thin film structure is damaged, the light absorption efficiency of the surface drops sharply and even stops absorbing. Although the ultraviolet radiation is strong in the initial stage of the aging test, the light intensity fails to be reasonably connected in the later stage, resulting in subsequent "waste" of ultraviolet irradiation, making the indoor ultraviolet aging process lose practical significance in the later stage. And the traditional ultraviolet aging test system ignores the changes in rainfall and temperature in the actual conditions, resulting in an even greater gap between the simulation effect and the actual situation, and it is difficult to accurately evaluate the color durability of colored concrete. Summary of the Invention

[0005] The purpose of the present application is to provide a method for aging test of colored concrete, which can truly simulate the ultraviolet aging situation and accurately evaluate the color durability of colored concrete.

[0006] In a first aspect, the present invention provides a method for aging test of colored concrete. The method for aging test of colored concrete includes: Dividing the whole year into four typical climate stages of spring, summer, autumn and winter according to the historical meteorological data of the target area; Determining the total annual ultraviolet irradiation amount, annual rainfall, sunshine hours, night duration and rainfall duration of each month in the target area through statistical analysis; The ultraviolet irradiation intensity is based on the noon peak irradiation intensity. The total ultraviolet irradiation duration T1 is calculated by the ratio of the total annual ultraviolet irradiation amount to the ultraviolet irradiation intensity, and the total ultraviolet irradiation duration T1 is allocated as T according to the sunshine hours ratio of each quarter 11 :T 12 :T 13 :T 14 ; The total pure water immersion duration T2 is calculated by the ratio of annual sunshine hours to rainfall duration, and the total pure water immersion duration T2 is allocated as T according to the rainfall duration ratio of each quarter 21 :T 22 :T 23 :T 24 ; The total dry and non-irradiated duration T3 is calculated by the ratio of sunshine hours to night duration, and the total dry and non-irradiated duration T3 is allocated as T according to the rainfall distribution of each quarter 31 :T 32 :T 33 :T 34 ; Mapping the total ultraviolet irradiation duration T1, the total pure water immersion duration T2 and the total dry and non-irradiated duration T3 to the daily 24-hour cycle period in proportion to form spring (t 11 →t 21 →t 31 ), summer (t 12 →t 22 →t 32 ), autumn (t 13 →t 23 →t 33 ), winter (t 14 →t 24 →t 34 ) four groups of time series combinations, and calculating the test days D of each season i ; Constructing an annual equivalent test cycle and sequentially executing a cyclic sequence of D1 days in spring, D2 days in summer, D3 days in autumn and D4 days in winter.

[0007] In an alternative embodiment, the calculation formula for the ultraviolet irradiation duration of each quarter is as follows:

[0008] Wherein: —— Ultraviolet irradiation duration of each quarter; —— Sunshine duration of each quarter; —— Total ultraviolet irradiation duration.

[0009] In an alternative embodiment, the calculation formula for the pure water immersion duration of each quarter is as follows:

[0010] Wherein: —— Pure water immersion duration of each quarter; —— Rainfall duration of each quarter; —— Ultraviolet irradiation duration of each quarter.

[0011] In an alternative embodiment, the calculation formula for the dry and non-irradiated duration of each quarter is as follows:

[0012] Wherein: —— Dry and non-irradiated duration of each quarter; —— Night duration of each quarter; —— Ultraviolet irradiation duration of each quarter.

[0013] In an alternative embodiment, the number of test days D i in each season is calculated as follows: D i =T 1i / t 1i .

[0014] In an alternative embodiment, after executing the loop sequence, a colorimeter is used to collect LAB parameters.

[0015] In an alternative embodiment, a color difference-time curve graph is plotted based on the LAB parameters to determine the durability of the surface color.

[0016] In an alternative embodiment, the output LAB parameters include three groups of data of the standard sample L, a, b and the after color comparison with the test sample , , .

[0017] In an alternative embodiment, the total color difference is calculated as follows:

[0018] Wherein: L—— Luminance value; a—— Red-green value; b—— Blue-yellow value; —— Luminance value difference; ——Difference in red-green values; ——Difference in blue-yellow values.

[0019] In an alternative embodiment, after each execution of the loop sequence, a colorimeter is used to collect LAB parameters.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: Based on the historical meteorological data of the target area, the present application calculates the total duration of ultraviolet irradiation T1, the total duration of pure water immersion T2, and the total duration of drying without irradiation T3, constructs an annual equivalent test cycle, forms a four-season cycle sequence, and on the basis of ultraviolet irradiation, increases the changes in rainfall and temperature, improves the simulation authenticity, and accurately evaluates the color durability of colored concrete. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 Shows a schematic diagram of the test environment conditions changing over time in Embodiment 1; Figure 2 Shows a graph of the color difference of colored concrete changing with the number of cycles in Embodiment 2. Detailed Embodiments

[0023] The following details the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0025] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0026] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] Embodiment 1 This embodiment takes the target area as City S as an example to illustrate the following color map aging test method.

[0029] This embodiment provides a color concrete aging test method, and this color concrete aging test method includes: S100. Divide the whole year into four typical climate stages of spring, summer, autumn and winter according to the historical meteorological data of the target area to reflect the seasonal dynamic changes in the real environment.

[0030] S200. Determine the total annual ultraviolet irradiation amount, annual rainfall, and the sunshine hours, night duration, and rainfall duration of each month in the target area through statistical analysis.

[0031] According to statistics, the total annual ultraviolet radiation amount in City S in 2023 is 679954 J / m 2 , the total precipitation is 1901.3 mm, and the annual sunshine hours are 4276.7 h.

[0032] Among them, from March to May: the average daytime temperature is 32.7 °C (set as the temperature during the ultraviolet irradiation period in the T1 stage), the average nighttime temperature is 17.0 °C (set as the temperature during the dry and non-irradiated period in the T1 stage), the average humidity is 78%, the rainfall is 397 mm, the sunshine duration is 1082.8 h, the rainfall duration is 171.1 h, and the night duration is 954.0 h.

[0033] From June to August: the average daytime temperature is 35.1 °C, the average nighttime temperature is 24.5 °C, the average humidity is 81%, the rainfall is 755.3 mm, the sunshine duration is 1217.1 h, the rainfall duration is 379.0 h, and the night duration is 611.8 h.

[0034] From September to November: the average daytime temperature is 33.2 °C, the average nighttime temperature is 18.9 °C, the average humidity is 75%, the rainfall is 731 mm, the sunshine duration is 1097.5 h, the rainfall duration is 393.1 h, and the night duration is 644.3 h.

[0035] From December to February: the average daytime temperature is 28.5 °C, the average nighttime temperature is 8.5 °C, the average humidity is 69%, the sunshine duration is 879.3 h, the rainfall duration is 7.6 h, and the night duration is 1273.7 h.

[0036] In this embodiment, based on the above statistical data analysis, the historical meteorological data of the target area is shown in Table 1-1.

[0037] Table 1-1 Historical Meteorological Data

[0038] S300. The ultraviolet irradiation intensity is based on the noon peak irradiation intensity. The total ultraviolet irradiation duration T1 is calculated by the ratio of the annual total ultraviolet irradiation amount to the ultraviolet irradiation intensity, and the total ultraviolet irradiation duration T1 is allocated to T according to the proportion of the sunshine hours in each quarter 11 :T 12 :T 13 :T 14 .

[0039] The total ultraviolet irradiation duration T1 = (the annual total ultraviolet radiation amount 679954 J / m 2 ) / (the test ultraviolet irradiation intensity 0.66 W / m 2 ):

[0040] The calculation formulas for the ultraviolet irradiation duration in each quarter are as follows:

[0041] Where: —— Ultraviolet irradiation duration for each quarter; —— Sunshine duration for each quarter; —— Total ultraviolet irradiation duration.

[0042] In this embodiment, is taken as an example, , and similarly, , , are calculated.

[0043] S400. The total pure water immersion duration T2 is calculated based on the ratio of annual sunshine duration to rainfall duration, and the total pure water immersion duration T2 is allocated to T 21 :T 22 :T 23 :T 24 .

[0044] The calculation formulas for the pure water immersion duration of each quarter are as follows:

[0045] In the formula: —— Pure water immersion duration for each quarter; —— Rainfall duration for each quarter; —— Ultraviolet irradiation duration for each quarter.

[0046] Taking as an example, , and similarly, , , are calculated.

[0047] S500. The total dry and non-irradiated duration T3 is calculated based on the ratio of sunshine duration to night duration, and the total dry and non-irradiated duration T3 is allocated to T 31 :T 32 :T 33 :T 34 .

[0048] The calculation formulas for the dry and non-irradiated duration of each quarter are as follows:

[0049] In the formula: —— Dry and non-irradiated duration for each quarter; —— Night duration for each quarter; —— Ultraviolet irradiation duration for each quarter.

[0050] Taking as an example, , and similarly, , , .

[0051] The total duration of ultraviolet irradiation T1, the total duration of pure water immersion T2, and the total duration of drying without irradiation T3 are respectively allocated for four quarters, and the test parameters for each quarter are shown in Table 1-2.

[0052] Table 1-2 Test Parameters

[0053] S600. Map the total duration of ultraviolet irradiation T1, the total duration of pure water immersion T2, and the total duration of drying without irradiation T3 proportionally to the 24-hour daily cycle to form four groups of time series combinations for spring (t 11 →t 21 →t 31 ), summer (t 12 →t 22 →t 32 ), autumn (t 13 →t 23 →t 33 ), and winter (t 14 →t 24 →t 34 ), and calculate the number of test days D for each season i .

[0054] The number of test days D for each season i is calculated as follows: D i =T 1i / t 1i .

[0055] T 11 :T 21 :T 31 =t 11 :t 21 :t 31 , T 12 :T 22 :T 32 =t 12 :t 22 :t 32 , T 13 :T 23 :T 33 =t 13 :t 23 :t 33 and T 14 :T 24 :T 34 =t 14 :t 24 :t 34 ; The number of test days D1 = T 11 / t 11 、D2 = T12 / t 12 、D3 = T 13 / t 13 、D4 = T 14 / t 14 :

[0056] In the formula: —— The ultraviolet irradiation duration per day in the first quarter; —— The total ultraviolet irradiation duration in the first quarter; —— The total pure water immersion duration in the first quarter; —— The total dry and non-irradiated duration in the first quarter.

[0057]

[0058] In the formula: —— The ultraviolet irradiation duration per day in the first quarter; —— The total ultraviolet irradiation duration in the first quarter; —— The number of test days simulating the first quarter.

[0059] The total ultraviolet irradiation duration T1 = T 11 +T 12 +T 13 +T 14 =t 11 ×D1 + t 12 ×D2 + t 13 ×D3 + t 14 ×D4; The total pure water immersion duration T2 = T 21 +T 22 +T 23 +T 24 =t 21 ×D1 + t 22 ×D2 + t 23 ×D3 + t 24 ×D4; The total dry and non-irradiated duration T3 = T 31 +T 32 +T 33 +T 34 =t 31 ×D1 + t 32 ×D2 + t 33 ×D3 + t 34 ×D.

[0060] According to the above formula, the environmental parameters of the four seasons are calculated as shown in Table 1-3.

[0061] Table 1-3 Environmental Parameters of the Four Seasons

[0062] S700. Construct an annual equivalent test cycle and sequentially execute a cyclic sequence of D1 days in spring, D2 days in summer, D3 days in autumn, and D4 days in winter.

[0063] The test adopts an accelerated environmental simulation method to reproduce the annual climate characteristics through a 24-day equivalent cycle. The specific design is as follows: Based on the climate data of the target area, map the environmental parameters of the four seasons to the daily cyclic sequence.

[0064] Among them, the spring simulation cycle is 11.8 hours of daily ultraviolet irradiation (simulating the photoaging effect), 1.8 hours of pure water immersion (simulating rainfall erosion), and 10.4 hours of dry and non-irradiated (simulating the night dehydration process), and continuously execute the cycle for 6 days.

[0065] In summer, it is adjusted to 13.2 hours of ultraviolet irradiation (enhancing the sunshine intensity), 4.1 hours of immersion (simulating the high rainfall during the monsoon period), and 6.7 hours of drying, and synchronously execute the cycle for 6 days.

[0066] In autumn, the ultraviolet irradiation is 12.3 hours, the immersion is 4.4 hours, and the drying is 7.3 hours, and the cycle is for 6 days.

[0067] In winter, it is set to 9.8 hours of ultraviolet irradiation (weakening the light intensity), 0.08 hours of immersion (simulating trace precipitation), and 14.2 hours of drying (prolonging the dehydration time), and also execute the cycle for 6 days.

[0068] This design quantifies the proportion of the action duration of the four-season environment (for example, the proportion of the immersion duration in summer reaches 17.1%, and only 0.3% in winter), accurately couples the dynamic alternation process of ultraviolet radiation, water environment exposure, and drying cycle. For the schematic diagram of the test environmental conditions changing with time, see Figure 1 .

[0069] While ensuring the equivalence of climate characteristics, this method significantly compresses the test cycle to 1 / 15 of the actual service time, providing an efficient experimental framework for the evaluation of material durability.

[0070] S800. After executing the cyclic sequence, use a color difference meter to collect LAB parameters.

[0071] There is no unified quantitative evaluation of the color effect and vividness of the pre-colored concrete. In this paper, a color difference-time curve is drawn by collecting LAB parameters with a color difference meter to determine the surface color durability. The test principle of the color difference meter is to automatically compare the color difference between the standard sample and the measured sample.

[0072] In this embodiment, it can be set that after each execution of the cyclic sequence, use a color difference meter to collect LAB parameters.

[0073] Based on the LAB parameters, draw a color difference-time curve to determine the durability of the surface color.

[0074] The output LAB parameters include three groups of data of the standard sample L, a, and b, as well as the compared with , , .

[0075] The total color difference is calculated as follows:

[0076] In the formula: L - brightness value; a - red-green value; b - blue-yellow value; - brightness value difference; - red-green value difference; - blue-yellow value difference.

[0077] In this application, through the historical meteorological data of the target area, the total duration of ultraviolet irradiation T1, the total duration of pure water immersion T2, and the total duration of drying without irradiation T3 are calculated, an annual equivalent test cycle is constructed to form a four-season cycle sequence. On the basis of ultraviolet irradiation, the changes of rainfall and temperature are added to improve the simulation authenticity and accurately evaluate the color durability of colored concrete.

[0078] Currently, most indoor ultraviolet aging tests adopt a continuous, short-time, and high-intensity ultraviolet irradiation method. Although this test method can shorten the material aging test time to a certain extent, there are many problems, resulting in its test results being difficult to accurately reflect the aging situation of colored concrete in the actual environment.

[0079] In terms of the protective agent film, strong light irradiation causes the surface structure of the film formed by the protective agent to be rapidly damaged. Due to the inconsistent aging rates of the aged part and the unaged part of the film and the asynchronous aging process, the aging effect is uneven, which is quite different from the actual ultraviolet aging situation.

[0080] When the film structure is damaged, the efficiency of the surface absorbing light energy drops sharply, and it even no longer absorbs light energy. In the initial stage of the aging test, although the ultraviolet radiation is strong, the light intensity cannot be reasonably connected in the later stage, resulting in the "waste" of subsequent ultraviolet irradiation, making the indoor ultraviolet aging test lose its practical significance in the later stage and unable to truly reflect the aging process of colored concrete.

[0081] Considering environmental factors, the traditional ultraviolet aging test system ignores the changes of rainfall and temperature in the actual conditions. Rainfall will affect the humidity on the surface of colored concrete, thereby affecting the migration of soluble alkalis and the chemical reaction with carbon dioxide; temperature changes will affect the stability of the pigment molecular structure, the performance of the protective agent, etc. However, these factors are not simulated in the traditional test, resulting in a further increase in the gap between the simulation effect and the actual situation and making it difficult to accurately evaluate the color durability of colored concrete.

[0082] In contrast, the color concrete ultraviolet aging test regime that simulates the alternation of day and night and the four seasons in the natural environment fully considers the factors ignored by the traditional tests mentioned above. By simulating the climatic conditions in different seasons, including ultraviolet irradiation intensity, rainfall duration, day and night duration, etc., the test process is closer to the actual service environment of color concrete.

[0083] After the test, the color concrete is analyzed. The colorimetric method is used to compare the color changes of the color concrete before and after aging under different test regimes, which can more accurately evaluate its color durability. In the test simulating the natural environment, the aging process of the color concrete is more uniform, the protective agent film can play a better role, and the process of surface light energy absorption is also more in line with the actual situation, avoiding the unreasonable light intensity utilization problem in the traditional test, thus providing a more reliable basis for the evaluation of the ultraviolet aging resistance performance of color concrete.

[0084] Example 2 a. The design scheme of the ultraviolet cyclic aging test is as follows: Taking City S as the target area, this application obtains relevant actual climate data. After going through the steps in the design method, the equivalent 1-year test cycle is 60 days, simulating 4 stages. The specific irradiation, drying without irradiation duration, and cycle days are shown in Table 2-1: Table 2-1

[0085] b. The design scheme of the ultraviolet + wet-dry cycle coupling aging test is as follows: Taking Shenzhen City as the target area, this research obtains relevant actual climate data. After going through the steps in the design method, the equivalent 1-year test cycle is 60 days, simulating 4 stages. The specific irradiation, drying without irradiation duration, and cycle days are shown in Table 2-2: Table 2-2 Time parameter settings for the coupling aging test

[0086] According to the mix ratio, special molds were customized to prepare mortar cube specimens with dimensions of 50×50×25 mm, a total of 2 groups, namely the ultraviolet cycle group and the ultraviolet + wet-dry cycle group, with 3 specimens in each group. During the experiment, after each cycle was completed, a color difference meter was used to collect the LAB parameters of the specimens.

[0087] After 60 days of ultraviolet irradiation cyclic experiment, the color difference of the color concrete changes with the number of cycles as Figure 2 shown.

[0088] ( Figure 2 in (a) of It has a faster growth rate and a higher final value, indicating that it is closer to the aging mode of colored concrete under the combined action of ultraviolet radiation and wet-dry alternation in the actual environment. The simple ultraviolet cycle only simulates the lighting factor, while the "ultraviolet + wet-dry cycle" accelerates the evolution of the pore structure on the material surface and the internal material migration by introducing the change of the wet-dry environment, making the comprehensive color change more significant and more truly reflecting the aging process under natural service conditions.

[0089] Observation (( Figure 2 In (b) of [reference], the brightness decrease in the "ultraviolet + wet-dry cycle" group is more obvious, indicating that the wet-dry cycle promotes faster fading of the concrete surface, and the pigments are more severely damaged by ultraviolet after exposure. This design simulates the physical damage of rainfall scouring and drying shrinkage on the material surface in reality, forming a synergistic aging effect with ultraviolet radiation. Compared with the single ultraviolet cycle, it more comprehensively reveals the color durability attenuation mechanism of colored concrete in complex environments.

[0090] In (( Figure 2 In (c) of [reference]) and (( Figure 2 In (d) of [reference]) parameter changes, the color coordinate values in the "ultraviolet + wet-dry cycle" group fluctuate more violently and the attenuation amplitude is greater. This is because the humidity change caused by the wet-dry cycle accelerates the migration of soluble salts inside the concrete and chemical reactions, changing the pigment dispersion state and surface optical properties. Incorporating the wet-dry factor into the system design makes up for the lack of simulation of environmental interaction in the traditional single ultraviolet test, more accurately reproduces the aging scenario of multi-factor coupling in the natural environment, provides a more reliable test basis for evaluating the anti-aging performance of colored concrete, and highlights the necessity of the system design simulating the synergistic action of natural multi-factors in the aging test.

[0091] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A colored concrete aging test method, characterized in that: include: The whole year is divided into four typical climate stages of spring, summer, autumn and winter according to the historical meteorological data of the target area; Determine the total annual ultraviolet radiation, annual rainfall, and sunshine hours, night hours, and rainfall hours of each month in the target area through statistical analysis; The UV radiation intensity is based on the peak radiation intensity at noon. The total UV radiation duration T1 is calculated by the ratio of the total annual UV radiation to the UV radiation intensity, and the total UV radiation duration T1 is allocated to T according to the proportion of sunshine hours in each quarter. 11 :T 12 :T 13 :T 14 ; The total time of pure water immersion T2 is calculated by the ratio of annual sunshine hours to rainfall hours, and the total time of pure water immersion T2 is allocated to T according to the ratio of rainfall hours in each season. 21 :T 22 :T 23 :T 24 ; The total dry and non-irradiated time T3 is calculated by the ratio of sunshine hours to night hours, and is distributed as T according to the rainfall distribution in each season. 31 :T 32 :T 33 :T 34 ; The total duration of UV irradiation T1, the total duration of pure water immersion T2, and the total duration of dryness without irradiation T3 are proportionally mapped to the daily 24-hour cycle to form the spring (t 11 →t 21 →t 31 ), Xia (t 12 →t 22 →t 32 ), autumn (t 13 →t 23 →t 33 ), winter (t 14 →t 24 →t 34 ) Four groups of time series are combined, and the number of test days in each season is calculated D i ; Construct a full-year equivalent test cycle, and execute the cyclic sequence of D1 day in spring, D2 days in summer, D3 days in autumn, and D4 days in winter in sequence.

2. The colored concrete aging test method according to claim 1, characterized in that: The calculation formula for the duration of UV exposure in each season is as follows: Where: —— Duration of UV exposure in each season; - sunshine hours in each season; ——Total duration of UV exposure.

3. The colored concrete aging test method according to claim 2, characterized in that: The calculation formula for the pure water immersion time in each quarter is as follows: Where: ——The duration of pure water immersion in each season; - Duration of rainfall in each season; ——Duration of UV exposure in each season.

4. The colored concrete aging test method according to claim 3, characterized in that: The calculation formula for the dry and non-irradiated time in each season is as follows: Where: - the dry and sun-free time in each season; - Length of night in each season; ——Duration of UV exposure in each season.

5. The colored concrete aging test method according to claim 4, characterized in that: Number of test days in each season D i The calculation formula is as follows: i =T 1i / t 1i .

6. The colored concrete aging test method according to any one of claims 1 to 4, characterized in that: After executing the cycle sequence, LAB parameters were collected using a colorimeter.

7. The colored concrete aging test method according to claim 6, characterized in that: The color difference-time curve is plotted based on the LAB parameters to determine the durability of the surface color.

8. The colored concrete aging test method according to claim 7, characterized in that: The output LAB parameters include three sets of data of standard sample L, a, b and the colorimetric data of the sample. and , , .

9. The colored concrete aging test method according to claim 8, characterized in that: Total color difference The calculation formula is as follows: In the formula: L——brightness value; a——red-green value; b——blue-yellow value; ——brightness value difference; ——Difference between red and green values; ——Difference between blue and yellow values.

10. The colored concrete aging test method according to claim 6, characterized in that: After each execution of the cycle sequence, LAB parameters were collected using a colorimeter.

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