Method for marking the age of protective coating on the surface of marine environment concrete structure

Abstract

The application discloses a kind of marine environment concrete structure surface coating protective coating age calibration method, it is related to marine engineering technical field, and the marine environment concrete structure surface coating protective coating age calibration method of the present application includes establishing the first mathematical relationship of surface coating protection construction control index and concrete curing age, determines the first concrete equivalent age;Establish the second mathematical relationship of concrete compressive strength and concrete equivalent age, determine the second concrete equivalent age;Obtain surface coating protection standard concrete coating age;According to temperature data, obtain the development law of entity engineering concrete equivalent age;Determine the surface coating protection actual coating age of entity engineering concrete structure under actual service environment.The present application can determine scientific coating operation opportunity, while avoiding the risk of protection failure caused by premature coating, improve the turnover efficiency of prefabrication yard, realize the balance of engineering quality and engineering economy.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to a method for calibrating the age of protective coatings applied to the surface of concrete structures in marine environments. Background Technology

[0002] Chloride corrosion in marine environments is a major factor affecting the durability of marine concrete structures. To ensure the service life of marine concrete structures, surface protection measures such as surface coating and silane impregnation are usually adopted to slow down the propagation speed of chloride ions in seawater in concrete.

[0003] According to standards such as the "Code for Construction of Corrosion Protection of Waterway Engineering Structures" (JTS / T 209-2020), the application time for surface protective materials such as surface coatings and silane impregnation should not be less than 28 days. This is mainly based on the control index that the compressive strength of concrete test blocks cured under the same conditions or indoor standard curing reaches 28 days. However, since the performance development of solid concrete structures is affected by many factors such as external environmental conditions, component dimensions, and concrete mix proportions, using only the performance development of concrete test blocks as an evaluation of the coating age of structural concrete is clearly unreasonable, especially for cast-in-place concrete structures in tidal-affected areas.

[0004] It should be noted that high-performance marine concrete has poor resistance to seawater erosion in its early stages due to insufficient early hydration. To avoid early contact between concrete structures and seawater, for some major cross-sea bridges and other transportation infrastructure projects, cast-in-place concrete structures in tidal zones are often constructed using the dry cofferdam method. At the same time, to avoid early seawater erosion of the concrete structure, steel cofferdams usually need to be painted after 28 days before they can be removed. This greatly reduces the turnover efficiency of steel cofferdams, restricts the construction progress, and increases the construction cost. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for calibrating the coating age of protective coatings on the surface of concrete structures in marine environments. This method can accurately determine the coating age of concrete components in actual engineering projects, improve the turnover efficiency of prefabrication yards, and thus improve the efficiency of engineering construction.

[0006] A method for calibrating the age of protective coatings applied to the surface of marine concrete structures according to embodiments of the present invention includes:

[0007] Based on the actual materials and the preset concrete mix proportions, a first mathematical relationship is established between the main performance parameters of surface coating protection and the curing age of concrete. The construction control indicators of surface coating protection are determined, and the first equivalent age of concrete when the construction control indicators are met is obtained according to the first mathematical relationship.

[0008] Based on the actual materials and the preset concrete mix proportion, a second mathematical relationship between the concrete compressive strength and the concrete equivalent age is established to determine the design strength of the concrete. The second equivalent age of the concrete when the design strength is met is obtained according to the second mathematical relationship.

[0009] Compare the first equivalent age of concrete with the second equivalent age of concrete, and take the larger value of the first equivalent age of concrete with the second equivalent age of concrete as the standard concrete coating age for surface coating protection.

[0010] Real-time monitoring of temperature data of concrete structures in actual service environments and the duration of each temperature; establishment of a third mathematical relationship between temperature data of concrete structures and concrete curing age; and acquisition of the development law of equivalent age of concrete in actual engineering projects based on the third mathematical relationship.

[0011] By comparing the development patterns of the surface coating protection standard concrete coating age with the equivalent age of concrete in actual engineering projects in real time, the actual coating age of the surface coating protection of concrete structures in actual service environments can be determined.

[0012] This approach offers at least the following benefits: Firstly, by establishing a primary mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete, it ensures that the concrete surface coating meets protective performance requirements. Secondly, by establishing a secondary mathematical relationship between concrete compressive strength and the equivalent age of concrete, it ensures that the concrete meets structural performance requirements. Furthermore, by combining temperature data from actual engineering concrete structures, it effectively quantifies the impact of ambient temperature on the concrete hydration process, thereby enabling a scientific assessment of the actual maturity of the concrete structure and determining the optimal coating timing. Accurately determining the coating timing effectively ensures the construction quality of the surface protective material, effectively reduces chloride ion erosion in the concrete structure, and improves the service life of marine concrete structures. It also solves the evaluation deviation problem caused by differences between the curing conditions of concrete specimens and actual engineering concrete structures. While avoiding the risk of protective failure due to premature coating, it scientifically shortens the support time in the prefabrication yard, thereby improving the turnover efficiency of the prefabrication yard and achieving a balance between project quality and economic efficiency.

[0013] According to some embodiments of the present invention, establishing a first mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete includes: preparing multiple sets of first concrete specimens based on actual engineering materials and a preset concrete mix proportion; curing the multiple sets of first concrete specimens for 1 day, 3 days, 5 days, 7 days, 10 days, 14 days, 21 days, and 28 days respectively under standard curing conditions; applying a surface protective material to the first concrete specimens at each curing age according to preset construction process parameters; curing for 3 days under standard curing conditions after coating; obtaining the main performance parameter values ​​of surface coating protection at different curing ages under standard curing conditions; and establishing a first mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete.

[0014] According to some embodiments of the present invention, establishing a second mathematical relationship between concrete compressive strength and concrete equivalent age includes: preparing multiple sets of second concrete specimens based on actual engineering materials and a preset concrete mix proportion; curing the multiple sets of second concrete specimens under standard curing conditions, and measuring the compressive strength values ​​of the second concrete specimens at curing ages of 3 days, 5 days, 7 days, 14 days, 21 days, and 28 days respectively; and establishing a second mathematical relationship between concrete compressive strength and concrete equivalent age based on the compressive strength values ​​of the second concrete specimens at each curing age.

[0015] According to some embodiments of the present invention, real-time monitoring of temperature data of concrete structures in actual service environments includes: during the concrete pouring process, arranging a temperature monitoring device at a preset depth on the surface of the concrete structure to collect real-time time-series data of the surface temperature of the concrete structure.

[0016] According to some embodiments of the present invention, establishing a third mathematical relationship between temperature data of concrete structures and the curing age of concrete includes: obtaining the apparent activation energy and ideal gas constant of concrete; converting the time series data of surface temperature of the concrete structure into a temperature influence coefficient based on the apparent activation energy and ideal gas constant of concrete; and obtaining the development law of the equivalent age of concrete in the actual engineering project, which reflects the actual maturity development law of the structure, based on the duration of each temperature segment and its corresponding influence coefficient.

[0017] According to some embodiments of the present invention, determining the actual coating age of a concrete structure in actual service environment includes: obtaining the cumulative equivalent age of the concrete structure in actual service environment based on the development law of the equivalent age of concrete in actual service environment; when the cumulative equivalent age reaches or exceeds the standard coating age of concrete in actual service environment, determining that the corresponding equivalent age of concrete in actual service environment is the actual coating age of concrete in actual service environment that meets the conditions for surface coating construction.

[0018] According to some embodiments of the present invention, when a surface coating is used for surface protection, the construction control index for surface coating protection is the bond strength when the surface coating and concrete form a reliable interface bond.

[0019] According to some embodiments of the present invention, the first mathematical relationship between the construction control index of surface coating protection and the curing age of concrete includes: obtaining the curing age of concrete coating, and confirming the bonding strength of the surface coating based on the curing age and a preset fitting constant.

[0020] According to some embodiments of the present invention, when the surface coating protection adopts silane impregnation, the construction control index of the surface coating protection is the impregnation depth of silane when a hydrophobic barrier is formed on the concrete surface.

[0021] According to some embodiments of the present invention, the first mathematical relationship between the construction control index of surface coating protection and the curing age of concrete includes: obtaining the immersion age of concrete, and confirming the silane impregnation depth based on the immersion age and a preset fitting constant.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic flowchart illustrating the method for calibrating the age of protective coatings on the surface of marine concrete structures according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram illustrating the mathematical relationship between the bonding strength of the surface coating and the curing age of concrete in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram illustrating the mathematical relationship between the compressive strength of concrete and the equivalent age of concrete in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram illustrating the mathematical relationship between the silane impregnation depth and the concrete curing age in an embodiment of the present invention. Detailed Implementation

[0028] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0030] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0031] Reference Figure 1 This invention discloses a method for calibrating the age of protective coatings applied to the surface of concrete structures in marine environments, comprising:

[0032] Based on the actual materials and the preset concrete mix proportions, a first mathematical relationship is established between the main performance parameters of surface coating protection and the curing age of concrete. The construction control indicators of surface coating protection are determined, and the first equivalent age of concrete when the construction control indicators are met is obtained according to the first mathematical relationship.

[0033] Based on the actual materials and the preset concrete mix proportion, a second mathematical relationship between the concrete compressive strength and the concrete equivalent age is established to determine the design strength of the concrete. The second equivalent age of the concrete when the design strength is met is obtained according to the second mathematical relationship.

[0034] Compare the first equivalent age of concrete with the second equivalent age of concrete, and take the larger value of the first equivalent age of concrete with the second equivalent age of concrete as the standard concrete coating age for surface coating protection.

[0035] Real-time monitoring of temperature data of concrete structures in actual service environments and the duration of each temperature; establishment of a third mathematical relationship between temperature data of concrete structures and concrete curing age; and acquisition of the development law of equivalent age of concrete in actual engineering projects based on the third mathematical relationship.

[0036] By comparing the development patterns of the surface coating protection standard concrete coating age with the equivalent age of concrete in actual engineering projects in real time, the actual coating age of the surface coating protection of concrete structures in actual service environments can be determined.

[0037] By establishing a primary mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete, the surface coating of concrete can be ensured to meet the protective performance requirements. A secondary mathematical relationship between concrete compressive strength and equivalent age can be established to ensure that the concrete meets structural performance requirements. Simultaneously, by combining temperature data from actual engineering concrete structures, the impact of ambient temperature on the concrete hydration process can be effectively quantified, thereby achieving a scientific assessment of the actual maturity of the concrete structure and determining the optimal coating timing. Precisely determining the coating timing effectively ensures the construction quality of the surface protective material, effectively reduces chloride ion erosion in the concrete structure, and extends the service life of marine concrete structures. Furthermore, it solves the assessment deviation problem caused by differences in curing conditions between concrete specimens and actual engineering concrete structures. While avoiding the risk of protective failure due to premature coating, it scientifically shortens the support time in the prefabrication yard, thereby improving the turnover efficiency of the prefabrication yard and achieving a balance between project quality and economic efficiency.

[0038] In some specific embodiments of the present invention, establishing the first mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete includes: preparing multiple sets of first concrete specimens according to the actual engineering materials and the preset concrete mix proportion; curing the multiple sets of first concrete specimens for 1 day, 3 days, 5 days, 7 days, 10 days, 14 days, 21 days and 28 days respectively under standard curing conditions; coating the first concrete specimens at each curing age with surface protective material according to the preset construction process parameters; curing the specimens for 3 days under standard curing conditions after coating; obtaining the main performance parameter values ​​of surface coating protection at different curing ages under standard curing conditions; and establishing the first mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete.

[0039] It should be noted that the standard curing conditions for concrete require an ambient temperature of 20±2℃ and a relative humidity of not less than 95%, with a curing time typically of 28 days. In some specific embodiments of the present invention, when a surface coating is used for surface protection, the construction control index for the surface coating is the bond strength when the surface coating and concrete form a reliable interface bond.

[0040] In some specific embodiments of the present invention, the first mathematical relationship between the construction control indicators of surface coating protection and the curing age of concrete includes: obtaining the concrete coating age, and confirming the bonding strength of the surface coating based on the coating age and a preset fitting constant. Specifically, the first mathematical relationship between the construction control indicators of surface coating protection and the curing age of concrete is expressed by the following formula:

[0041] L = A.ln(t) e )+B;

[0042] Where L is the adhesive strength of the surface coating, and t eLet A be the curing age of the concrete, and B be fitting constants.

[0043] In some specific embodiments of the present invention, when the surface coating protection adopts silane impregnation, the construction control index of the surface coating protection is the impregnation depth of silane when a hydrophobic barrier is formed on the concrete surface.

[0044] In some specific embodiments of the present invention, the first mathematical relationship between the construction control index of surface coating protection and the curing age of concrete includes: obtaining the concrete immersion age, and confirming the silane impregnation depth based on the immersion age and a preset fitting constant. Specifically, the first mathematical relationship between the construction control index of surface coating protection and the curing age of concrete is expressed by the following formula:

[0045]

[0046] Where H is the silane impregnation depth, t e denoted as the concrete curing age, and a and b as fitting constants.

[0047] In some specific embodiments of the present invention, establishing a second mathematical relationship between concrete compressive strength and concrete equivalent age includes: preparing multiple sets of second concrete specimens based on actual engineering materials and a preset concrete mix proportion; curing the multiple sets of second concrete specimens under standard curing conditions, and measuring the compressive strength values ​​of the second concrete specimens at curing ages of 3 days, 5 days, 7 days, 14 days, 21 days, and 28 days respectively; and establishing a second mathematical relationship between concrete compressive strength and concrete equivalent age based on the compressive strength values ​​of the second concrete specimens at each curing age.

[0048] Specifically, the second mathematical relationship between the compressive strength of concrete and the equivalent age of concrete is expressed by the following formula three:

[0049] f cu =c.lnt f +d;

[0050] In the formula, f cu t represents the compressive strength of concrete. f denoted as the concrete curing age, and c and d as fitting constants.

[0051] The first equivalent age t of the concrete corresponding to the bond strength of the preset surface coating is obtained according to Formula 1. a Alternatively, the first equivalent age t of the concrete corresponding to the preset silane impregnation depth can be obtained according to Formula 2. a According to Formula 3, the second equivalent age t of the concrete corresponding to the preset design compressive strength is obtained. f , with t = MAX(t a , t fThe standard for concrete coating protection in physical engineering projects is the concrete coating age.

[0052] In some specific embodiments of the present invention, periodically acquiring temperature data of concrete in actual service environments includes: during the concrete pouring process, arranging a temperature monitoring device at a preset depth on the surface of the concrete structure to collect real-time temperature time-series data of the concrete structure surface.

[0053] In some specific embodiments of the present invention, obtaining the development law of the equivalent age of concrete in a real project based on temperature data includes: obtaining the apparent activation energy and ideal gas constant of concrete; converting the time series data of surface temperature of the real concrete structure into a temperature influence coefficient based on the apparent activation energy and ideal gas constant of concrete; and obtaining the development law of the equivalent age of concrete in a real project to reflect the actual maturity development law of the structure based on the duration of each temperature segment and its corresponding influence coefficient.

[0054] Specifically, the development law of the equivalent age of concrete in solid engineering projects is expressed by the following formula four:

[0055] t=∑a T t T ;

[0056] In the formula, t is the equivalent age of the concrete in the actual project, and a T Let be the equivalent coefficient for temperature T, where E a Let be the apparent activation energy of concrete, taken as 35000 J / mol, and R be the ideal gas constant, taken as 8.314 J / (mol·K). T Let T be the duration of temperature T.

[0057] In some specific embodiments of the present invention, determining the actual coating age of the concrete structure of the actual engineering project under actual service environment includes: obtaining the cumulative equivalent age of the concrete structure of the actual engineering project according to the development law of the equivalent age of the concrete of the actual engineering project; when the cumulative equivalent age reaches or exceeds the standard concrete coating age of the surface coating protection, it is determined that the corresponding equivalent age of the concrete of the actual engineering project at this time is the actual coating age of the surface coating protection that meets the surface coating construction conditions.

[0058] The following two specific examples illustrate the method for calibrating the age of protective coatings applied to the surface of concrete structures in this marine environment.

[0059] Example 1:

[0060] Taking the cast-in-place concrete structure of the pile caps of a port terminal in South China as an example, the pile caps of this project are made of C45 marine high-performance concrete with fly ash and slag powder mixed together, and the pile caps are coated with a surface coating for surface protection.

[0061] First, based on the materials at the construction site and the pre-set concrete mix proportion, multiple sets of first concrete specimens with dimensions of 15cm×15cm×15cm were prepared. After standard curing for 1 day, 3 days, 5 days, 7 days, 10 days, 14 days, 21 days and 28 days respectively, the first concrete specimens at each curing age were coated with a surface coating according to the construction requirements. After coating, they were cured for 3 days under standard curing conditions.

[0062] The bond strength of the surface coating on first concrete specimens at different ages under standard curing conditions was tested, thereby establishing the mathematical relationship between the main performance parameters of the surface coating protection and the curing age of the first concrete specimens. For example... Figure 2 As shown, the mathematical relationship between the main performance parameters of the surface coating protection and the curing age of the first concrete specimen is expressed by the following formula:

[0063] L = 0.90ln(t) e +0.34;

[0064] In the formula, L is the adhesive strength of the surface coating, and t e Let R be the curing age of the concrete. The coefficient of determination R in this formula is... 2 =0.95.

[0065] Considering the quality fluctuation of the bonding strength of the concrete surface coating, a bonding strength of 2.25 MPa is taken as the construction control index for surface coating protection. According to Formula 5, when the bonding strength of the surface coating on the first concrete specimen is 2.25 MPa, the equivalent age t of the first concrete is... a The calculated value is 8.35 days, which is equivalent to 200.4 hours of age.

[0066] Secondly, based on the materials at the engineering site and the pre-set concrete mix proportion, at least six sets of second concrete specimens with dimensions of 15cm×15cm×15cm were prepared. These second concrete specimens were cured under standard curing conditions, and the compressive strength values ​​of the second concrete specimens were measured at curing ages of 3 days, 5 days, 7 days, 14 days, 21 days, and 28 days, respectively. This established a mathematical relationship between the concrete compressive strength and the equivalent curing age of the second concrete specimens. For example... Figure 3 As shown, the mathematical relationship between the compressive strength of concrete and the equivalent age of the second concrete specimen is expressed by the following formula:

[0067] f cu =10.13ln(t) f +21.31;

[0068] In the formula, f cu The compressive strength of the second concrete specimen is t. fLet R be the curing age of the concrete. The coefficient of determination R in this formula is... 2 =0.93.

[0069] According to Formula 6, when the compressive strength of the second concrete specimen is 100% of the design strength, i.e., the compressive strength is 45 MPa, the equivalent age t of the second concrete is calculated. f The calculated value is 10.37 days, which is equivalent to 248.88 hours of age.

[0070] With t = MAX(t) a , t f The standard age for concrete coating protection in physical engineering projects is t. f The effective curing period is 10.37 days, which is equivalent to 248.88 hours, serving as the shortest time for applying a coating to the surface of a concrete structure.

[0071] Finally, during the pile cap pouring construction, multiple temperature monitoring probes were arrayed and embedded 2cm away from the surface concrete inside the pile cap structure to periodically acquire the temperature time series data of the surface of the pile cap concrete structure during the construction period. Based on the temperature time series data of the pile cap concrete surface, the development law of the equivalent age of the pile cap concrete structure was calculated using Formula 4:

[0072] t=∑a T t T ;

[0073] In the formula, t is the equivalent age of the concrete in the actual project, and a T Let be the equivalent coefficient for temperature T, where E a Let be the apparent activation energy of concrete, taken as 35000 J / mol, and R be the ideal gas constant, taken as 8.314 J / (mol·K). T Let T be the duration of temperature T.

[0074] Table 1 shows the development law of equivalent age of wharf pile cap concrete with construction time based on Formula 7. Construction time is the sum of the actual curing time of the concrete structure under all temperatures, i.e., the total natural curing time of the concrete structure from the start of pouring to the current moment. According to Table 1, 248.88 hours is less than 275.21 hours. 275.21 hours corresponds to a construction time of 6 days, meaning that the curing time for coating the pile cap concrete surface should not be less than 6 days.

[0075] Table 1

[0076] Equivalent age / h 40.87 100.90 152.08 239.08 275.21 307.11 493.87

[0077] Example 2:

[0078] Taking the cast-in-place concrete structure of pile caps at a port terminal in South China as an example, the pile caps of this project are made of C45 marine high-performance concrete with fly ash and slag powder mixed together, and the pile caps are coated with silane for surface protection.

[0079] First, based on the materials at the construction site and the pre-set concrete mix proportion, multiple sets of first concrete specimens with dimensions of 15cm×15cm×15cm were prepared. After standard curing for 1 day, 3 days, 5 days, 7 days, 10 days, 14 days, 21 days and 28 days respectively, the first concrete specimens at each curing age were coated with silane material according to the construction requirements of the project. After coating, they were cured for 3 days under standard curing conditions.

[0080] The bond strength of the surface coating on first concrete specimens at different ages under standard curing conditions was tested, thereby establishing the mathematical relationship between the main performance parameters of the surface coating protection and the curing age of the first concrete specimens. For example... Figure 4 As shown, the mathematical relationship between the main performance parameters of the surface coating protection and the curing age of the first concrete specimen is expressed by the following formula:

[0081]

[0082] Where H is the silane impregnation depth, t e Let R be the curing age of the concrete. The coefficient of determination R in this formula is... 2 =0.82.

[0083] According to Formula 7, when the silane impregnation depth of the first concrete specimen is 2.5 mm, the equivalent age t of the first concrete is... a The calculated value is 4.26 days, which is equivalent to 102.2 hours of age.

[0084] Secondly, based on the materials at the engineering site and the preset concrete mix proportion, at least 6 sets of second concrete specimens with dimensions of 15cm×15cm×15cm were prepared. The second concrete specimens were cured under standard curing conditions, and the compressive strength values ​​of the second concrete specimens at curing ages of 3 days, 5 days, 7 days, 14 days, 21 days and 28 days were measured respectively. Then, a mathematical relationship between the concrete compressive strength and the equivalent age of the second concrete specimens was established.

[0085] According to Formula 6, when the compressive strength of the second concrete specimen is 100% of the design strength, i.e., the compressive strength is 45 MPa, the equivalent age t of the second concrete is calculated. f The calculated value is 10.37 days, which translates to an equivalent age of 248.88 hours. Let t = MAX(t a , t f The standard age for concrete coating protection in physical engineering projects is t. fThe effective curing period is 10.37 days, which is equivalent to 248.88 hours, serving as the shortest time for applying a coating to the surface of a concrete structure.

[0086] Finally, during the pile cap pouring construction, multiple temperature monitoring probes were arrayed and embedded 2cm away from the surface concrete inside the pile cap structure to periodically obtain the temperature time series data of the surface of the pile cap concrete structure during the construction period. Based on Formula 4, the development law of the equivalent age of the pile cap concrete structure is obtained as shown in Table 1, that is, the coating age of the pile cap concrete surface should not be less than 6 days.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for calibrating the age of protective coatings applied to the surface of concrete structures in marine environments, characterized in that, include: Based on the actual materials and the preset concrete mix proportions, a first mathematical relationship is established between the main performance parameters of surface coating protection and the curing age of concrete. The construction control indicators of surface coating protection are determined, and the first equivalent age of concrete when the construction control indicators are met is obtained according to the first mathematical relationship. Based on the actual materials and the preset concrete mix proportion, a second mathematical relationship between the concrete compressive strength and the concrete equivalent age is established to determine the design strength of the concrete. The second equivalent age of the concrete when the design strength is met is obtained according to the second mathematical relationship. Compare the first equivalent age of concrete with the second equivalent age of concrete, and take the larger value of the first equivalent age of concrete with the second equivalent age of concrete as the standard concrete coating age for surface coating protection. Real-time monitoring of temperature data of concrete structures in actual service environments and the duration of each temperature; establishment of a third mathematical relationship between temperature data of concrete structures and concrete curing age; and acquisition of the development law of equivalent age of concrete in actual engineering projects based on the third mathematical relationship. By comparing the development patterns of the surface coating protection standard concrete coating age with the equivalent age of concrete in actual engineering projects in real time, the actual coating age of the surface coating protection of concrete structures in actual service environments can be determined.

2. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 1, characterized in that, The primary mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete includes: Multiple sets of first concrete specimens were prepared based on the actual materials and the preset concrete mix proportions of the project. Under standard curing conditions, the multiple sets of first concrete specimens were cured for 1 day, 3 days, 5 days, 7 days, 10 days, 14 days, 21 days and 28 days respectively. According to the preset construction process parameters, the first concrete specimens at each curing age were coated with surface protective material, and after coating, they were cured for 3 days under standard curing conditions. The performance strength values ​​of surface coating protection at different curing ages under standard curing conditions were obtained, and the first mathematical relationship between the main performance parameters of surface coating protection and the curing age of concrete was established.

3. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 2, characterized in that, Establishing a second mathematical relationship between concrete compressive strength and equivalent age of concrete includes: Multiple sets of second concrete specimens were prepared based on the actual materials used in the project and the pre-set concrete mix proportions. Multiple groups of second concrete specimens were cured under standard curing conditions, and the compressive strength values ​​of the second concrete specimens were measured at curing ages of 3 days, 5 days, 7 days, 14 days, 21 days and 28 days, respectively. Based on the compressive strength values ​​of the second concrete specimens at each curing age, a second mathematical relationship between the compressive strength of concrete and the equivalent age of concrete is established.

4. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 3, characterized in that, Real-time monitoring of temperature data of concrete structures in actual service environments includes: during the concrete pouring process, a temperature monitoring device is installed at a predetermined depth on the surface of the concrete structure to collect real-time temperature data of the concrete structure surface.

5. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 4, characterized in that, Establishing a third mathematical relationship between temperature data and the curing age of concrete structures in physical engineering projects includes: Obtain the apparent activation energy and ideal gas constant of concrete, and convert the time series data of surface temperature of solid concrete structure into temperature influence coefficient based on the apparent activation energy and ideal gas constant of concrete. Based on the duration of each temperature range and its corresponding influence coefficient, the development law of the equivalent age of concrete in the actual engineering project is obtained to reflect the actual maturity development law of the structure.

6. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 5, characterized in that, Determining the actual coating age for surface protection of concrete structures in real-world service environments includes: The cumulative equivalent age of concrete structures in real engineering projects is obtained based on the development law of equivalent age of concrete in real engineering projects. When the cumulative equivalent age reaches or exceeds the standard concrete coating age for surface coating protection, the corresponding equivalent age of the concrete in the actual project is determined to be the actual coating age for surface coating protection that meets the surface coating construction conditions.

7. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to any one of claims 1 to 6, characterized in that, When surface coating is used for protection, the construction control index for surface coating is the bond strength when the surface coating forms a reliable interface bond with the concrete.

8. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 7, characterized in that, The first mathematical relationship between the construction control indicators of surface coating protection and the curing age of concrete includes: obtaining the curing age of concrete coating, and confirming the bonding strength of the surface coating based on the curing age and a preset fitting constant.

9. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to any one of claims 1 to 6, characterized in that, When surface coating protection uses silane impregnation, the construction control index for surface coating protection is the impregnation depth of silane when it forms a hydrophobic barrier on the concrete surface.

10. The method for calibrating the age of protective coatings on the surface of marine environmental concrete structures according to claim 9, characterized in that, The first mathematical relationship between the construction control indicators of surface coating protection and the curing age of concrete includes: obtaining the immersion age of concrete and confirming the silane impregnation depth based on the immersion age and a preset fitting constant.

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