Test Method for Aging of Colored Concrete

Abstract

The present application provides a method for aging test of colored concrete, which relates to material determination; the method for aging test of colored concrete includes: dividing the whole year into spring, summer, autumn and winter according to the historical meteorological data of the target area; determining various parameters of the target area through statistical analysis; allocating the total ultraviolet irradiation duration T1 according to the proportion of sunshine hours in each quarter; allocating the total pure water immersion duration T2 according to the proportion of rainfall duration in each quarter; allocating the total dry and non-irradiated duration T3 according to the rainfall distribution in each quarter; mapping the various parameters to the 24-hour daily cycle according to the proportion to form four time series combinations of spring, summer, autumn and winter, and calculating the test days D for each season i ; constructing an equivalent test cycle for the whole year and sequentially executing the cyclic sequence. The present application calculates various parameters through the historical meteorological data of the target area, 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

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 function and decoration. With the characteristics of rich colors, environmental friendliness 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 air humidity. 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 not synchronized. This uneven 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:

[0007] 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;

[0008] 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;

[0009] 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 to T 11 :T 12 :T 13 :T 14 ;

[0010] The total pure water immersion duration T2 is calculated by the ratio of the annual sunshine hours to the rainfall duration, and the total pure water immersion duration T2 is allocated to T 21 :T 22 :T 23 :T 24 ;

[0011] The total dry and non-irradiated duration T3 is calculated by the ratio of the sunshine hours to the night duration, and the total dry and non-irradiated duration T3 is allocated to T 31 :T 32 :T 33 :T 34 ;

[0012] 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 according to a ratio 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 ;

[0013] Construct an annual equivalent test cycle and execute a cyclic sequence of D1 days in spring, D2 days in summer, D3 days in autumn, and D4 days in winter in sequence.

[0014] In an alternative embodiment, the calculation formula for the ultraviolet irradiation duration of each quarter is as follows:

[0015]

[0016] In the formula: —— The ultraviolet irradiation duration of each quarter; —— The sunshine duration of each quarter; —— The total ultraviolet irradiation duration.

[0017] In an alternative embodiment, the calculation formula for the pure water immersion duration of each quarter is as follows:

[0018]

[0019] In the formula: —— The pure water immersion duration of each quarter; —— The rainfall duration of each quarter; —— The ultraviolet irradiation duration of each quarter.

[0020] In an alternative embodiment, the calculation formula for the dry and non-irradiated duration of each quarter is as follows:

[0021]

[0022] In the formula: —— The dry and non-irradiated duration of each quarter; —— The night duration of each quarter; —— The ultraviolet irradiation duration of each quarter.

[0023] In an alternative embodiment, for the test days D i of each season, the calculation formula is as follows: D i =T 1i / t 1i .

[0024] In an alternative embodiment, after executing the cyclic sequence, a color difference meter is used to collect LAB parameters.

[0025] 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.

[0026] In an alternative embodiment, the output LAB parameters include three groups of data of the standard sample L, a, b and the compared with the , , .

[0027] In an alternative embodiment, the total color difference is calculated according to the following formula:

[0028]

[0029] where: L - luminance value; a - red - green value; b - blue - yellow value; ΔL - luminance value difference; Δa - red - green value difference; Δb - blue - yellow value difference.

[0030] In an alternative embodiment, after each execution of the said cyclic sequence, a colorimeter is used to collect LAB parameters.

[0031] Compared with the prior art, the beneficial effects of this application are:

[0032] This application calculates the total duration T1 of ultraviolet irradiation, the total duration T2 of pure water immersion, and the total duration T3 of drying without irradiation through the historical meteorological data of the target area, constructs an annual equivalent test cycle, forms a four - season cyclic 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some 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.

[0034] Figure 1 Shows a schematic diagram of the test environmental conditions changing with time in Embodiment 1;

[0035] Figure 2 Shows a graph of the color difference of colored concrete changing with the number of cycles in Embodiment 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following details the embodiments of this 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 this application and should not be construed as limiting this application.

[0037] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes 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.

[0039] In this application, unless otherwise clearly defined and limited, the terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. 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.

[0040] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can 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" the second feature can 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 "under" the second feature can 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.

[0041] Embodiment 1

[0042] This embodiment takes the target area as City S as an example to illustrate the following color map aging test method.

[0043] This embodiment provides a color concrete aging test method, and this color concrete aging test method includes:

[0044] 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.

[0045] S200. Determine 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.

[0046] According to statistics, the total annual ultraviolet radiation amount in City S in 2023 was 679954 J / m 2 , the total precipitation was 1901.3 mm, and the annual sunshine hours were 4276.7 h.

[0047] Among them, from March to May: the average daytime temperature was 32.7 °C (set as the temperature during the ultraviolet irradiation period in the T1 stage), the average nighttime temperature was 17.0 °C (set as the temperature during the dry and non-irradiation period in the T1 stage), the average humidity was 78%, the rainfall was 397 mm, the sunshine duration was 1082.8 h, the rainfall duration was 171.1 h, and the night duration was 954.0 h.

[0048] From June to August: the average daytime temperature was 35.1 °C, the average nighttime temperature was 24.5 °C, the average humidity was 81%, the rainfall was 755.3 mm, the sunshine duration was 1217.1 h, the rainfall duration was 379.0 h, and the night duration was 611.8 h.

[0049] From September to November: the average daytime temperature was 33.2 °C, the average nighttime temperature was 18.9 °C, the average humidity was 75%, the rainfall was 731 mm, the sunshine duration was 1097.5 h, the rainfall duration was 393.1 h, and the night duration was 644.3 h.

[0050] From December to February: the average daytime temperature was 28.5 °C, the average nighttime temperature was 8.5 °C, the average humidity was 69%, the sunshine duration was 879.3 h, the rainfall duration was 7.6 h, and the night duration was 1273.7 h.

[0051] In this embodiment, based on the above statistical data analysis, the historical meteorological data of the target area is shown in Table 1-1.

[0052] Table 1-1 Historical Meteorological Data

[0053]

[0054] 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 total annual ultraviolet irradiation amount to the ultraviolet irradiation intensity, and the total ultraviolet irradiation duration T1 is allocated to T according to the sunshine hours ratio of each quarter 11 :T 12 :T13 : T 14 。

[0055] The total duration of ultraviolet irradiation T1 = (total annual ultraviolet radiation dose 679954 J / m 2 ) / (test ultraviolet irradiation intensity 0.66 W / m 2 ):

[0056]

[0057] The calculation formulas for the ultraviolet irradiation duration in each quarter are as follows:

[0058]

[0059] Where: —— The ultraviolet irradiation duration in each quarter; —— The sunshine hours in each quarter; —— The total duration of ultraviolet irradiation.

[0060] In this embodiment, taking as an example, , similarly, calculate , , .

[0061] S400. The total duration of pure water immersion T2 is calculated by the ratio of annual sunshine hours to rainfall duration, and the total duration of pure water immersion T2 is distributed as T 21 : T 22 : T 23 : T 24 .

[0062] The calculation formulas for the pure water immersion duration in each quarter are as follows:

[0063]

[0064] Where: —— The pure water immersion duration in each quarter; —— The rainfall duration in each quarter; —— The ultraviolet irradiation duration in each quarter.

[0065] Taking as an example, , similarly, calculate , , .

[0066] S500. The total duration of drying without irradiation T3 is calculated by the ratio of sunshine hours to night duration, and the total duration of drying without irradiation T3 is distributed as T 31 : T32 :T 33 :T 34 。

[0067] The calculation formulas for the drying and non-irradiation duration of each quarter are as follows:

[0068]

[0069] In the formula: —— The drying and non-irradiation duration of each quarter; —— The night duration of each quarter; —— The ultraviolet irradiation duration of each quarter.

[0070] Taking as an example, , similarly, calculate 、 、 。

[0071] Distribute the total ultraviolet irradiation duration T1, the total pure water immersion duration T2, and the total drying and non-irradiation duration T3 to the four quarters respectively. The test parameters for each quarter are shown in Table 1-2.

[0072] Table 1-2 Test Parameters

[0073]

[0074] S600. Map the total ultraviolet irradiation duration T1, the total pure water immersion duration T2, and the total drying and non-irradiation duration T3 to the 24-hour daily cycle proportionally 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 i 。

[0075] The calculation formula for the number of test days D i of each season is as follows: D i =T 1i / t 1i 。

[0076] T 11 :T 21 :T 31 =t 11 :t 21 :t31 , 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 per quarter = T 11 / t 11 , D2 = T 12 / t 12 , D3 = T 13 / t 13 , D4 = T 14 / t 14 :

[0077]

[0078] Where: —— 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.

[0079]

[0080] Where: —— 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.

[0081] 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;

[0082] The total pure water immersion duration T2 = T 21 + T 22 + T23 +T 24 =t 21 ×D1 + t 22 ×D2 + t 23 ×D3 + t 24 ×D4;

[0083] The total duration of drying without irradiation T3 = T 31 +T 32 +T 33 +T 34 =t 31 ×D1 + t 32 ×D2 + t 33 ×D3 + t 34 ×D.

[0084] According to the above formula, the environmental parameters of the four seasons are calculated as shown in Table 1 - 3.

[0085] Table 1 - 3 Environmental Parameters of the Four Seasons

[0086]

[0087] 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.

[0088] 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.

[0089] Among them, the spring simulation cycle is 11.8 hours of daily ultraviolet irradiation (simulating the photo - aging effect), 1.8 hours of pure water immersion (simulating rainfall erosion), and 10.4 hours of drying without irradiation (simulating the night - time dehydration process), and it is continuously cycled for 6 days.

[0090] 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 it is synchronously cycled for 6 days.

[0091] In autumn, it is 12.3 hours of ultraviolet irradiation, 4.4 hours of immersion, and 7.3 hours of drying, and it is cycled for 6 days.

[0092] 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 it is also cycled for 6 days.

[0093] By quantifying the proportion of the duration of the environmental effects in the four seasons (for example, the soaking duration in summer accounts for 17.1%, while in winter it is only 0.3%), the design precisely couples the dynamic alternation process of ultraviolet radiation, water environment exposure, and drying cycles. For the schematic diagram of the test environmental conditions changing over time, see Figure 1 。

[0094] 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.

[0095] After executing the loop sequence, use a color difference meter to collect LAB parameters.

[0096] There is no unified quantitative evaluation of the color effect and vividness of the former 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 differences between the standard sample and the sample to be measured.

[0097] In this embodiment, it can be set that after each execution of the loop sequence, a color difference meter is used to collect LAB parameters.

[0098] Based on the LAB parameters, draw a color difference-time curve to determine the durability of the surface color.

[0099] The output LAB parameters include three groups of data of the standard sample L, a, b and the and 、 、 。

[0100] The total color difference is calculated as follows:

[0101]

[0102] 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.

[0103] This application calculates the total duration of ultraviolet irradiation T1, the total duration of pure water soaking T2, and the total duration of drying without irradiation T3 through the historical meteorological data of the target area, 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 to improve the simulation authenticity and accurately evaluate the color durability of colored concrete.

[0104] 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.

[0105] In terms of the protective agent film, strong light irradiation rapidly destroys the surface structure of the film formed by the protective agent. Due to the inconsistent aging rates of the aged part and the un-aged part of the film, the aging processes are out of sync, resulting in uneven aging effects, which is quite different from the actual ultraviolet aging situation.

[0106] When the film structure is damaged, the efficiency of the surface absorbing light energy drops sharply and even stops absorbing 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, causing "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.

[0107] Considering environmental factors, the traditional ultraviolet aging test system ignores the changes in rainfall and temperature in the actual conditions. Rainfall will affect the humidity on the surface of colored concrete, and then affect 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, the traditional test fails to simulate these factors, 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.

[0108] In contrast, this ultraviolet aging test system for colored concrete that simulates the alternation of day and night and the four seasons in the natural environment fully considers the factors ignored by the traditional test. 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 colored concrete.

[0109] After the test, the colored concrete is analyzed, and the colorimetric method is used to compare the color changes of the colored concrete before and after aging under different test systems, which can more accurately evaluate its color durability. In the test simulating the natural environment, the aging process of colored concrete is more uniform, the protective agent film can play a better role, and the process of the surface absorbing light energy is also more in line with the actual situation, avoiding the unreasonable use of light intensity problems in the traditional test, thus providing a more reliable basis for the evaluation of the ultraviolet aging resistance performance of colored concrete.

[0110] Example 2

[0111] a. The design scheme of the ultraviolet cyclic aging test is as follows:

[0112] This application takes City S as the target area, obtains relevant actual climate data, and through the steps in the design method, the equivalent test cycle of 1 year is 60 days, simulating 4 stages. The specific irradiation, drying without irradiation duration, and cycle days are shown in Table 2-1:

[0113] Table 2-1

[0114]

[0115] b. The design scheme of the ultraviolet + wet and dry cycle coupling aging test is as follows:

[0116] This study takes Shenzhen City as the target area, obtains relevant actual climate data, and through the steps in the design method, the equivalent test cycle of 1 year is 60 days, simulating 4 stages. The specific irradiation, drying without irradiation duration, and cycle days are shown in Table 2-2:

[0117] Time parameter settings for the coupling aging test in Table 2-2

[0118]

[0119] According to the mix ratio, special molds were customized, and mortar cube specimens with dimensions of 50×50×25 mm were prepared. There were 2 groups in total, namely the ultraviolet cycle group and the ultraviolet + wet and dry cycle group, and each group contained 3 specimens. During the experiment, after each cycle was completed, the LAB parameters of the specimens were collected using a color difference meter.

[0120] After 60 days of ultraviolet irradiation cycle experiment, the color difference of the colored concrete changes with the number of cycles as Figure 2 shown.

[0121] ( Figure 2 in (a) of ), it can be seen that in the "ultraviolet + wet and dry cycle" group, as the number of cycles increases, the growth rate is faster and the final value is higher, indicating that it is closer to the aging mode of colored concrete under the combined action of ultraviolet radiation and wet and dry alternation in the actual environment. The simple ultraviolet cycle only simulates the light factor, while the "ultraviolet + wet and dry cycle" accelerates the evolution of the pore structure on the material surface and the migration of internal substances by introducing the change of the wet and dry environment, making the comprehensive color change more significant and more truly reflecting the aging process under natural service conditions.

[0122] Observation ( Figure 2In (b) thereof, the brightness decline of 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 being exposed. This design simulates the physical damage of rainfall scouring and drying shrinkage to the material surface in reality, and forms 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.

[0123] In ( Figure 2 in (c) thereof and ( Figure 2 in (d) thereof, the color coordinate values of 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 and chemical reaction of soluble salts inside the concrete, changing the pigment dispersion state and surface optical properties. Incorporating the wet-dry factors 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.

[0124] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean 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.

[0125] 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 method for aging test of colored concrete, characterized in that, Including: 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 peak irradiation intensity at noon. 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 sunshine hours in each quarter 11 :T 12 :T 13 :T 14 ; The total duration T2 of pure water immersion is calculated by the ratio of annual sunshine hours to rainfall duration, and the total duration T2 of pure water immersion is allocated to T according to the rainfall duration ratio of each quarter 21 : T 22 : T 23 : T 24 ; The total duration T3 of dry and non-irradiated is calculated by the ratio of sunshine hours to night duration, and the total duration T3 of dry and non-irradiated is allocated to T according to the rainfall distribution in each quarter 31 :T 32 :T 33 :T 34 ; Map the total duration of ultraviolet irradiation \(T1\), the total duration of soaking in pure water \(T2\), and the total duration of drying without irradiation \(T3\) proportionally to the 24-hour daily cycle 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 calculate the number of test days \(D\) for 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; The calculation formula for the ultraviolet irradiation duration of each quarter is as follows: In the formula: —— The ultraviolet irradiation duration of each quarter; —— The sunshine duration of each quarter; —— The total ultraviolet irradiation duration; The calculation formula for the pure water immersion duration of each quarter is as follows: Wherein: —— The pure water immersion duration for each quarter; —— The rainfall duration for each quarter; —— The ultraviolet irradiation duration for each quarter; The calculation formula for the dry and non-irradiated duration of each quarter is as follows: Wherein: —— The dry and irradiation-free duration of each quarter; —— The night duration of each quarter; —— The ultraviolet irradiation duration of each quarter.

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

3. The method for aging test of colored concrete according to claim 1, wherein After executing the cyclic sequence, use a color difference meter to collect LAB parameters.

4. The method for aging test of colored concrete according to claim 3, characterized in that, Draw a color difference-time curve based on the LAB parameters to determine the durability of the surface color.

5. The method for aging test of colored concrete according to claim 4, characterized in that, The output LAB parameters include three groups of data for the standard sample L, a, and b, as well as after color comparison with the specimen and , , , where L is the brightness value; a is the red-green value; b is the blue-yellow value; ——total color difference; ——brightness value difference; ——red-green value difference; ——blue-yellow value difference.

6. The method for aging test of colored concrete according to claim 5, characterized in that, Total color difference The calculation formula is as follows: Where: L——luminance value; a——red-green value; b——blue-yellow value; ——luminance value difference; ——red-green value difference; ——blue-yellow value difference.

7. The method for aging test of colored concrete according to claim 3, characterized in that, After each execution of the cyclic sequence, use a color difference meter to collect LAB parameters.

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