Method for reinforcing concrete structure through building carbon fiber material

Abstract

The invention discloses a method for reinforcing a concrete structure by using a building carbon fiber material, and belongs to the technical field of building materials, and the method comprises the following steps: determining target mechanical property parameters of the concrete structure, including compressive strength, tensile strength and elastic modulus; determining the optimal mixing amount and length of the carbon fibers through a calculation model, and uniformly dispersing the carbon fibers into a concrete matrix to form a mixture; performing a rheological test to evaluate the uniformity of the mixture, and adjusting the dispersion process as required; pouring the mixture and carrying out curing treatment; testing the mechanical property of the cured structure; and comparing the actual performance with the target parameters, and adjusting the mixing amount and length of the carbon fibers if necessary. The performance of traditional concrete is remarkably improved, a carbon fiber reinforced concrete structure can have higher mechanical performance and durability, and the carbon fiber reinforced concrete is suitable for wider building and engineering application.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reinforcing a concrete structure with building carbon fiber materials. Background Art

[0002] Concrete, as a key material in the construction industry, has been widely used in civil engineering construction due to its low production cost, high availability and mature technology. It has become an indispensable material in building structures due to its good compressive resistance and easy casting. However, despite the important position of concrete in the construction field, its performance limitations have gradually been exposed, especially in the context of the increasing requirements for material performance in modern construction projects.

[0003] Ordinary concrete has a relatively low tensile strength, which limits its use in applications subject to complex stresses. In addition, concrete is brittle and easily breaks when subjected to tensile or bending loads, lacking sufficient ductility and toughness. In practical applications, concrete structures are also prone to cracks due to temperature changes, drying shrinkage, or chemical erosion, affecting the durability and safety of the structure. Traditional mechanical property testing methods often cannot accurately reflect the performance of materials in practical applications, especially their behavior under complex stress states. In addition, the curing process of concrete has a significant impact on its final performance, but traditional curing methods may not meet the requirements of high-performance concrete. These defects have, to a certain extent, limited the application of concrete in a wider range of fields. Therefore, the development of a new building material or technology that can overcome these defects is of great significance to promoting the development of the construction industry. Summary of the invention

[0004] In view of the above problems, the present invention provides a method for building carbon fiber material reinforced concrete structure, which achieves a significant improvement in the performance of traditional concrete, and can make the carbon fiber reinforced concrete structure have higher mechanical properties and durability, and is suitable for a wider range of construction and engineering applications.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for building a carbon fiber material reinforced concrete structure, the method comprising the following steps:

[0007] (1) Determine the target mechanical performance parameters P of the concrete structure, including the compressive strength f c , tensile strength f t and elastic modulus E;

[0008] (2) Determine the optimal carbon fiber content V through the calculation model f and length L to achieve the target mechanical property parameter P;

[0009] (3) using a dispersing device to uniformly disperse the carbon fiber material in a concrete matrix to form a carbon fiber reinforced concrete mixture;

[0010] (4) Evaluate the uniformity of the carbon fiber reinforced concrete mixture through rheological testing and obtain the rheological parameter R of the mixture;

[0011] (5) judging whether the carbon fiber is evenly distributed in the concrete according to the rheological parameter R; if not, adjusting the dispersion process and returning to step 3;

[0012] (6) casting the carbon fiber reinforced concrete mixture and performing a curing treatment;

[0013] (7) Conduct mechanical property tests on the cured carbon fiber reinforced concrete structure to obtain actual mechanical property data P actual ;

[0014] (8) The actual mechanical properties data P actual Compared with the target mechanical property parameter P, if the actual performance does not reach the target,

[0015] According to the test results, adjust the carbon fiber content V f and length L.

[0016] The present invention improves the tensile strength, toughness and ductility of concrete by optimizing the dosage and distribution of carbon fiber. Accurate mechanical property testing and curing treatment optimize the performance and durability of the material. The application of artificial intelligence algorithms further improves the accuracy of the design and the performance of the structure.

[0017] As a further improvement of the above scheme, the calculation model described in step 2 includes evaluating the interfacial bonding strength τ between the carbon fiber and the concrete matrix, which affects the carbon fiber reinforcement effect, and the carbon fiber volume fraction V f It is determined by multiplying the square root of and the inverse of the carbon fiber length L by the interface bonding strength coefficient k.

[0018] The technical effect of the above improvements is that by evaluating the interfacial bonding strength between carbon fiber and concrete matrix, the optimal amount and length of carbon fiber can be determined more accurately, thereby improving the mechanical properties of carbon fiber reinforced concrete (CFRC). This model helps to optimize the distribution of carbon fiber in concrete, so that it can more effectively transfer stress when subjected to load, improving the overall strength and durability of the structure.

[0019] As a further improvement of the above scheme, the uniform dispersion of the carbon fiber material in step 3 is achieved by controlling the carbon fiber volume fraction V fThis is achieved by adjusting the ratio of the fiber length to the length L to ensure that the carbon fibers are evenly distributed in the concrete matrix, thereby improving the mechanical properties of the concrete structure.

[0020] The technical effect of the above improvements is: controlling the ratio of carbon fiber volume fraction and length, ensuring that the carbon fiber is evenly distributed in the concrete matrix, which helps to improve the mechanical properties of the concrete structure. Evenly dispersed carbon fibers can better withstand tensile and bending loads, reduce stress concentration in the structure, and thus extend the service life of the structure.

[0021] As a further improvement of the above scheme, the judgment logic in step 5 is simulated and analyzed using computer-aided design (CAD) software, and the actual rheological parameters R measured Compared with the expected rheological parameters R expected The ratio of , minus 1, is used to obtain the uniformity index, which is used to quantify the uniformity of carbon fiber distribution in concrete.

[0022] The technical effect of the above improvements is that the uniformity of carbon fiber distribution in concrete can be quantified by comparing the ratio of actual rheological parameters to expected rheological parameters through simulation analysis using computer-aided design (CAD) software. This method helps to predict and adjust the performance of the mixture before pouring, ensuring the quality and consistency of the concrete structure.

[0023] As a further improvement of the above scheme, the mechanical property test in step 7 includes but is not limited to a three-point bending test, a compression test or a tensile test of a standard specimen, and the test results determine the actual mechanical property parameters according to the test type, including compressive strength, tensile strength and elastic modulus.

[0024] The technical effects of the above improvements include, but are not limited to, three-point bending tests, compression tests or tensile tests on standard specimens, the results of which help determine the actual mechanical performance parameters, including compressive strength, tensile strength and elastic modulus. This comprehensive testing method can provide more accurate data for evaluating and comparing the performance of different CFRC mixtures.

[0025] As a further improvement of the above scheme, the amount of carbon fiber V is adjusted in step 8. f The length L is the optimization result based on the artificial intelligence algorithm. f and length L, combined with the target mechanical properties parameter P and the actual mechanical properties data P actual The difference between them, as well as the sensitivity of the target parameters to the dosage and length (i.e., partial derivative), are calculated, and learning rates α and β are introduced to control the amplitude of adjustment, thereby optimizing the dosage and length of carbon fiber.

[0026] The technical effect of the above improvement is that based on the optimization results of the artificial intelligence algorithm, the carbon fiber content and length can be automatically adjusted to meet the target mechanical performance parameters. This method can reduce the interference of human factors, improve the accuracy and efficiency of the adjustment process, and thus achieve a more optimized CFRC structure design.

[0027] As a further improvement of the above scheme, the target mechanical property parameter P determined in step 1 is obtained by c , tensile strength f t The maximum value of the elastic modulus E is selected for calculation to ensure that the concrete structure meets the most critical mechanical performance requirements.

[0028] The technical effect of the above improvement is: by selecting the maximum value among compressive strength, tensile strength and elastic modulus to calculate the target mechanical performance parameters, it is ensured that the concrete structure meets the most critical mechanical performance requirements. This method helps to determine the key performance indicators of the structure in the design stage and provide guidance for subsequent material selection and structural design.

[0029] As a further improvement of the above scheme, the rheological test in step 4 includes a viscosity test, and the viscosity test is performed by measuring the carbon fiber volume fraction V f The ratio of the length L and the elastic modulus E of the carbon fiber f The product of the modulus of elasticity E of concrete is used to determine the fluidity of carbon fiber reinforced concrete mixtures.

[0030] The technical effects of the above improvements are: including viscosity testing, which is determined by the ratio of carbon fiber volume fraction and length and the product of carbon fiber elastic modulus and the square root of concrete elastic modulus to evaluate the fluidity of carbon fiber reinforced concrete mixture. This test helps to optimize the pouring and curing process of concrete and improve the quality of the final structure.

[0031] As a further improvement of the above scheme, the time and temperature of the curing treatment in step 6 are determined by the following steps:

[0032] (a) Determine an initial curing time-temperature combination based on the type of concrete matrix and the properties of the carbon fiber reinforcement;

[0033] (b) Conduct small-scale experiments to evaluate the effects of different curing time-temperature combinations on the mechanical properties of CFRP structures;

[0034] (c) Collect test data and use statistical analysis methods to determine the optimal curing time-temperature combination to maximize mechanical properties;

[0035] (d) Develop standard operating procedures for the curing process based on the optimal curing time-temperature combination;

[0036] (e) In actual production, real-time monitoring equipment is used to ensure that the time and temperature during the curing process meet the requirements of standard operating procedures;

[0037] (f) After the curing treatment is completed, the mechanical properties of the cured carbon fiber reinforced concrete structure are tested to verify whether the effect of the curing treatment meets expectations.

[0038] The beneficial effects of the above improvements are:

[0039] By precisely determining the curing time and temperature, an optimized method for the curing process of carbon fiber reinforced concrete structures is provided, which significantly improves the mechanical properties of the structure. This method ensures the best interfacial bond strength between the carbon fiber and the concrete matrix, and enhances the compressive strength, tensile strength and elastic modulus of the structure. In addition, the optimized curing process helps to form a uniform and dense concrete, improves durability and corrosion resistance, while also saving costs and improving construction efficiency. Standardization of the curing process also helps to ensure construction safety and quality control, extend the service life of the structure and reduce maintenance requirements. In addition, this method has strong environmental adaptability and can be adjusted according to different environmental conditions, promoting sustainable construction practices.

[0040] As a further improvement of the above scheme, the frequency F of the mechanical property test in step 7 is based on the actual mechanical property data P actual The test frequency is determined by taking the square root of the ratio of the actual to target performance parameters and dividing it by the test frequency parameter C to ensure the accuracy and reliability of the test results.

[0041] The technical effect of the above improvement is that the test frequency is determined based on the difference between the actual mechanical property data and the target mechanical property parameters and the specific test frequency parameters. This adjustment can ensure the accuracy and reliability of the test results and provide more reliable data support for the performance evaluation of the structure.

[0042] The method for reinforcing concrete structure with building carbon fiber materials of the present invention has the following advantages:

[0043] 1. Improve tensile strength: By adding carbon fiber materials to concrete, the tensile strength and toughness of concrete are significantly improved.

[0044] 2. Increased ductility: The addition of carbon fiber improves the ductility of concrete, making it less likely to break when subjected to tensile or bending loads.

[0045] 3. Reduce cracks: The uniform dispersion of carbon fibers helps to reduce and control the expansion of cracks in concrete, improving the overall performance of the structure.

[0046] 4. Efficient curing treatment: The method of the present invention includes the optimization of the time and temperature of the curing treatment to achieve the best curing effect.

[0047] 5. Accurate mechanical properties testing: By optimizing the test frequency and conditions, the accuracy and reliability of the test results are ensured, and the actual application conditions of the material are better simulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution, the present invention is described in detail below in conjunction with embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0050] Embodiment 1:

[0051] like Figure 1 As shown, the specific scheme of this embodiment is: a method for building carbon fiber material reinforced concrete structure, the method comprising the following steps:

[0052] (1) Determine the target mechanical performance parameters P of the concrete structure, including the compressive strength f c , tensile strength f t and elastic modulus E;

[0053] (2) Determine the optimal carbon fiber content V through the calculation model f and length L to achieve the target mechanical property parameter P;

[0054] (3) using a dispersing device to uniformly disperse the carbon fiber material in a concrete matrix to form a carbon fiber reinforced concrete mixture;

[0055] (4) Evaluate the uniformity of the carbon fiber reinforced concrete mixture through rheological testing and obtain the rheological parameter R of the mixture;

[0056] (5) judging whether the carbon fiber is evenly distributed in the concrete according to the rheological parameter R; if not, adjusting the dispersion process and returning to step 3;

[0057] (6) casting the carbon fiber reinforced concrete mixture and performing a curing treatment;

[0058] (7) Conduct mechanical property tests on the cured carbon fiber reinforced concrete structure to obtain actual mechanical property data Pactual ;

[0059] (8) The actual mechanical properties data P actual Compared with the target mechanical property parameter P, if the actual performance does not reach the target,

[0060] According to the test results, adjust the carbon fiber content V f and length L.

[0061] As a preferred embodiment of the above embodiment, the calculation model in step 2 includes evaluating the interfacial bonding strength τ between the carbon fiber and the concrete matrix, which affects the carbon fiber reinforcement effect, and the carbon fiber volume fraction V f It is determined by multiplying the square root of and the inverse of the carbon fiber length L by the interface bonding strength coefficient k.

[0062] Specifically, the calculation model in step 2 includes the following formula:

[0063] τ=k·V f 0.5 ·L -0.5

[0064] τ: interfacial bond strength, which represents the bonding force between carbon fiber and concrete matrix.

[0065] k: Interface bonding strength coefficient, a constant used to adjust the calculated results of bonding strength.

[0066] V f : The volume fraction of carbon fiber, that is, the ratio of the volume of carbon fiber to the total volume of concrete.

[0067] L: The length of carbon fiber, which affects the bonding area and bonding effect.

[0068] The formula is designed to quantitatively describe the bond strength between carbon fiber and concrete matrix, which is a key factor in ensuring the performance of carbon fiber reinforced concrete. In the field of concrete reinforcement, bond strength directly affects the reinforcement effect and durability of the structure.

[0069] The formula optimizes the carbon fiber dosage and length by quantifying the effect of carbon fiber volume fraction and length on bond strength to achieve the best interface bonding performance, thereby improving the mechanical properties of concrete structures.

[0070] Specifically, the uniform dispersion of the carbon fiber material in step 3 is achieved by controlling the carbon fiber volume fraction V f This is achieved by adjusting the ratio of the fiber length to the length L to ensure that the carbon fibers are evenly distributed in the concrete matrix, thereby improving the mechanical properties of the concrete structure.

[0071] Specifically, the judgment logic in step 5 is simulated and analyzed using computer-aided design (CAD) software, and the actual rheological parameters R measured Compared with the expected rheological parameters R expected The ratio of , minus 1, is used to obtain the uniformity index, which is used to quantify the uniformity of carbon fiber distribution in concrete.

[0072] The uniformity index JYZS is determined by:

[0073]

[0074] R measured : Actual rheological parameters, obtained through experimental measurement.

[0075] R expected : Expected rheological parameters, expected values ​​based on theoretical calculations or historical data.

[0076] This formula is used to quantify the uniformity of carbon fiber distribution in concrete. During the concrete production process, ensuring the uniform distribution of carbon fiber is crucial to improving the overall performance of the structure. The uniformity index provides an intuitive way to evaluate the deviation between the actual rheological parameters and the expected values, thereby guiding process adjustments to ensure the uniform distribution of carbon fiber, which is crucial to improving the mechanical properties of concrete structures.

[0077] Specifically, the mechanical property test in step 7 includes but is not limited to a three-point bending test, a compression test or a tensile test of a standard specimen, and the test results determine the actual mechanical property parameters according to the test type, including compressive strength, tensile strength and elastic modulus.

[0078] The test result is determined by the following formula:

[0079]

[0080] P actual : The actual mechanical performance parameters are determined according to the test type.

[0081] f c : Compressive strength, obtained through compression test.

[0082] f t : Tensile strength, obtained through tensile test.

[0083] E: elastic modulus, obtained by bending test.

[0084] This formula is used to determine the actual performance parameters of concrete based on different types of mechanical property tests. In the design and construction of concrete structures, accurate evaluation of the actual mechanical properties of materials is essential to ensure structural safety and performance. By clearly distinguishing the performance parameters under different test conditions, this formula provides a more precise method to evaluate and compare the actual mechanical properties of concrete, which helps to optimize material design and construction processes.

[0085] Specifically, in step 8, the amount of carbon fiber V is adjusted f The length L is the optimization result based on the artificial intelligence algorithm. f and length L, combined with the target mechanical properties parameter P and the actual mechanical properties data P actual The difference between them, as well as the sensitivity of the target parameters to the dosage and length (i.e., partial derivative), are calculated, and learning rates α and β are introduced to control the amplitude of adjustment, thereby optimizing the dosage and length of carbon fiber.

[0086] Adjust the carbon fiber content V as described in step 8 f The sum length L is the optimization result based on the artificial intelligence algorithm and is determined by:

[0087]

[0088] and L * : Adjusted carbon fiber content and length.

[0089] α and β: learning rates, used to control the magnitude of the adjustment.

[0090] P and P actual : Target mechanical properties parameters and actual mechanical properties parameters.

[0091] and The partial derivative of the target mechanical property parameter with respect to the carbon fiber content and length indicates the influence of the content and length on the performance.

[0092] This formula is used to optimize the amount and length of carbon fiber based on artificial intelligence algorithms to achieve target mechanical properties. By introducing the concepts of learning rate and partial derivatives, this formula provides an advanced method to dynamically adjust the amount and length of carbon fiber to meet different performance requirements.

[0093] Specifically, the target mechanical property parameter P determined in step 1 is obtained by c , tensile strength f t The maximum value of the elastic modulus E is selected for calculation to ensure that the concrete structure meets the most critical mechanical performance requirements.

[0094] Specifically, the rheological test in step 4 includes a viscosity test, and the viscosity test is performed by measuring the carbon fiber volume fraction V f The ratio of the length L and the elastic modulus E of the carbon fiber f The product of the modulus of elasticity E of concrete is used to determine the fluidity of carbon fiber reinforced concrete mixtures.

[0095] The rheological tests described in step 4 include viscosity tests, which are determined by:

[0096]

[0097] Where η is the viscosity of the mixture, E f is the elastic modulus of carbon fiber, and E is the elastic modulus of concrete.

[0098] Rheological parameters are important indicators for evaluating the fluidity of concrete mixtures. This formula predicts the rheological behavior of the mixture through the physical properties of carbon fibers, which helps to predict and adjust the performance of the mixture before actual construction. During the construction process, the fluidity of the mixture is directly related to the ease of construction and the uniformity of the final product.

[0099] By relating the elastic modulus of carbon fiber to that of concrete, this paper provides a new method to evaluate and control the rheological properties of carbon fiber reinforced concrete, which is crucial to ensure the homogeneity and workability of the mix during construction.

[0100] Specifically, the time and temperature of the curing treatment in step 6 are determined by the following steps:

[0101] (a) Determine an initial curing time-temperature combination based on the type of concrete matrix and the properties of the carbon fiber reinforcement;

[0102] (b) Conduct small-scale experiments to evaluate the effects of different curing time-temperature combinations on the mechanical properties of CFRP structures;

[0103] (c) Collect test data and use statistical analysis methods to determine the optimal curing time-temperature combination to maximize mechanical properties;

[0104] (d) Develop standard operating procedures for the curing process based on the optimal curing time-temperature combination;

[0105] (e) In actual production, real-time monitoring equipment is used to ensure that the time and temperature during the curing process meet the requirements of standard operating procedures;

[0106] (f) After the curing treatment is completed, the mechanical properties of the cured carbon fiber reinforced concrete structure are tested to verify whether the effect of the curing treatment meets expectations.

[0107] More specifically, the time and temperature of the curing treatment in step 6 are determined by the following steps:

[0108] (a) Define a curing efficiency function E(t,T), where t is the curing time and T is the curing temperature. This function represents the curing efficiency at a given time and temperature;

[0109] (b) The curing efficiency function E(t,T) is given by the following formula:

[0110]

[0111] in:

[0112] A is a constant that depends on the properties of the concrete matrix and the carbon fiber reinforcement;

[0113] x is the exponent of time, which indicates the effect of time on curing efficiency;

[0114] y is the temperature index, which indicates the effect of temperature on curing efficiency;

[0115] k is a positive constant that indicates the sensitivity of temperature to the curing efficiency;

[0116] T0 is the optimal temperature of the curing process;

[0117] (c) Determine constants A, x, y, and k, and optimal temperature T0 by experiment;

[0118] (d) Use calculus to find the maximum value of E(t,T) to determine the optimal curing time and temperature;

[0119] (e) Develop standard operating procedures for the curing process based on the optimal curing time-temperature combination;

[0120] (f) In actual production, real-time monitoring equipment is used to ensure that the time and temperature during the curing process meet the requirements of standard operating procedures;

[0121] (g) After the curing treatment is completed, the mechanical properties of the cured carbon fiber reinforced concrete structure are tested to verify whether the effect of the curing treatment meets expectations.

[0122] This method combines the effects of time and temperature on curing efficiency and models these effects through exponential and Gaussian functions. By finding the maximum value of this function, we can determine the optimal time and temperature for the curing process to maximize the mechanical properties of carbon fiber reinforced concrete structures.

[0123] Specifically, the frequency F of the mechanical properties test in step 7 is based on the actual mechanical properties data P actualThe test frequency is determined by taking the square root of the ratio of the actual to target performance parameters and dividing it by the test frequency parameter C to ensure the accuracy and reliability of the test results.

[0124] The frequency F of the mechanical properties test in step 7 is determined by the following formula:

[0125]

[0126] Among them, C is the test frequency parameter. This formula is used to determine the optimal frequency of mechanical properties testing to ensure the accuracy and reliability of the test results.

[0127] This formula is used to determine the optimal frequency of mechanical property testing to ensure the accuracy and reliability of test results. In the process of material performance evaluation, determining the appropriate test frequency is crucial to ensure data accuracy and test efficiency. By correlating test frequency with actual performance data, a new method is provided to optimize test plans and ensure test efficiency and effectiveness.

[0128] We set the following conditions:

[0129] The target mechanical property parameter P (eg compressive strength) was set to 50 MPa.

[0130] Actual mechanical properties data P actual The test result is 45MPa.

[0131] The test frequency parameter C is selected as 10.

[0132] Calculate the frequency F of the mechanical properties test using the given formula:

[0133] Calculating test frequency

[0134] This means that, based on the difference between the actual and target performance parameters and the test frequency parameter, the optimal frequency for mechanical property testing is approximately 0.09487 times / unit time (the specific unit time depends on the context of the test, such as hours, days, etc.).

[0135] Therefore, if the test is conducted within a week, approximately 0.09487*7=0.664 tests should be conducted, which means that one test per week is sufficient. This frequency ensures the accuracy and reliability of the test results while avoiding over-testing, thus saving resources and time.

[0136] Embodiment 2:

[0137] This embodiment describes in detail a method for reinforcing concrete structures with building carbon fiber materials, which optimizes the mechanical properties of concrete by precisely controlling the amount and length of carbon fiber. The following steps show in detail how to achieve the target mechanical property parameters and verify the effectiveness of the method through experiments.

[0138] 1. Determination of target mechanical properties parameters

[0139] In this example, we first need to determine the target mechanical properties of the concrete structure, which are important references in the design and construction process. The target mechanical properties include compressive strength, tensile strength, and elastic modulus. These parameters are crucial to ensure the safety and functionality of the structure.

[0140] To meet the specific design requirements, we set the following target values: compressive strength of 50MPa, tensile strength of 5MPa, and elastic modulus of 30GPa. These parameters are set according to the structure's use environment and expected loads to ensure that the structure can withstand various external forces during its expected service life.

[0141] 2. Determination of the optimal amount and length of carbon fiber

[0142] Next, we need to determine the optimal amount and length of carbon fiber to achieve the target mechanical properties. This step is crucial because the amount and length of carbon fiber directly affect the mechanical properties of concrete.

[0143] We used a computational model to evaluate the interfacial bond strength between carbon fiber and concrete matrix. The interfacial bond strength is a key factor affecting the carbon fiber reinforcement effect. We calculated the interfacial bond strength using the following formula:

[0144]

[0145] Where k is the interfacial bonding strength coefficient, we set k = 1.2. In order to achieve the target interfacial bonding strength τ = 10MPa, we solve this equation and get the volume fraction of carbon fiber V f =0.02 (i.e. 2%), and the length of the carbon fiber L = 10 mm. These parameters will be used in the subsequent preparation of the concrete mixture.

[0146] 3. Uniform dispersion of carbon fiber

[0147] After determining the optimal amount and length of carbon fiber, we use professional dispersion equipment to evenly disperse the carbon fiber in the concrete matrix. This step is crucial to ensure the uniformity and consistency of carbon fiber reinforced concrete.

[0148] We control the carbon fiber volume fraction V fThe ratio of length L is used to achieve uniform dispersion. This process requires precise operation and monitoring to ensure that the carbon fibers are evenly distributed in the concrete matrix, thereby improving the overall mechanical properties of the concrete structure.

[0149] 4. Rheological test

[0150] To evaluate the flow properties of carbon fiber reinforced concrete mixes, we performed rheological tests, including viscosity tests. This step is crucial to predict and adjust the performance of the mix during construction.

[0151] We use the following formula to calculate the viscosity η of the mixture:

[0152]

[0153] Where E f is the elastic modulus of carbon fiber, we set E f =200GPa, the elastic modulus E of concrete is 30GPa. Substitute V f = 0.02 and L = 10 mm, we calculated η = 0.0667 Pa·s. This viscosity value will be used to guide the adjustment of the mixture during construction.

[0154] 5. Uniformity assessment

[0155] After rheological testing, we need to evaluate the uniformity of the carbon fiber distribution in the concrete. We calculate the uniformity index by comparing the actual rheological parameters with the expected rheological parameters.

[0156] We set the expected rheological parameter R expected =0.09Pa·s, actual rheological parameter R measured =0.0667Pa·s. The uniformity index is calculated according to the following formula:

[0157]

[0158] Substituting the numerical values, we get JYZS = -0.2667. This negative value indicates that the actual rheological parameters are slightly lower than the expected values, but very close, indicating that the distribution of carbon fibers in concrete is relatively uniform.

[0159] 6. Curing treatment

[0160] After the carbon fiber reinforced concrete mixture is poured into shape, we need to cure it.

[0161] Step 1: Define the curing efficiency function

[0162] We define the curing efficiency function as:

[0163]

[0164] in:

[0165] A = 100 (determined based on experiments);

[0166] x = 1.5 (the effect of time on curing efficiency);

[0167] y = 2 (the effect of temperature on curing efficiency);

[0168] k = 0.05 (temperature sensitivity constant);

[0169] T0=30 (optimum curing temperature, unit: degrees Celsius).

[0170] Step 2: Determine the Optimal Curing Time and Temperature

[0171] To find the maximum value of E(t,T), we need to take the partial derivatives with respect to t and T respectively and set them equal to zero.

[0172] First, find the partial derivative with respect to t:

[0173]

[0174] Since A, x, T, and are all positive numbers, we can conclude that:

[0175]

[0176] This is not a practical solution, so we need to consider the actual range of t;

[0177] Next, find the partial derivative with respect to T:

[0178]

[0179] Simplifying gives:

[0180] y·T y-1 -2k(T-T0)·T y =0

[0181] T y-1 (y-2kT+2kT0)=0

[0182] Due to T y-1 ≠0, we have:

[0183]

[0184] Substituting y=2 and T0=30:

[0185]

[0186] Now, we need to find the corresponding t value. Since the partial derivative of t does not provide a practical solution, we can use numerical methods or experimental data to determine t. Through experiments, we found that when T = 50, t = 24 hours can achieve the best curing efficiency.

[0187] Step 3: Develop a standard operating procedure for curing

[0188] Based on the above calculations, we formulate the standard operating procedures for curing treatment as follows:

[0189] Curing time: 24 hours;

[0190] Curing temperature: 50 degrees Celsius.

[0191] Step 4: Real-time monitoring and mechanical properties testing

[0192] In actual production, we use real-time monitoring equipment to ensure that the time and temperature during the curing process meet the requirements of standard operating procedures. After the curing process is completed, we conduct mechanical property tests on the cured carbon fiber reinforced concrete structure.

[0193] Step 5: Data Form and Validation

[0194] We create a data table to record the mechanical properties test results at different curing times and temperatures:

[0195] Table 1: Mechanical properties test results at different curing times and temperatures

[0196]

[0197] Taking into account the balance of cost, time, mechanical properties and the long-term durability of the material, we can see that the comprehensive mechanical properties of the carbon fiber reinforced concrete structure are optimal when the curing time is 24 hours and the curing temperature is 50 degrees Celsius. This verifies the technical effect of our invention.

[0198] 7. Mechanical properties test

[0199] After the curing process is completed, we conduct mechanical property tests on the cured carbon fiber reinforced concrete structure. The tests include compression test, tensile test and bending test to obtain actual mechanical property data.

[0200] Assume that the test results are: compressive strength of 70MPa, tensile strength of 20MPa, and elastic modulus of 35GPa. These data will be used to compare with the target mechanical property parameters.

[0201] 8. Parameter adjustment

[0202] If the actual performance does not meet the target, we need to adjust the carbon fiber content and length based on the test results. We use artificial intelligence algorithms to optimize these parameters.

[0203] We use the following formula to make the adjustment:

[0204]

[0205] Set the learning rate α = 0.01, β = 0.01, partial derivative Substitute the current V f =0.02, L=10mm, P=50MPa, P actual =70MPa, we calculated the adjusted carbon fiber content and length L * =10.1mm.

[0206] Verification

[0207] Through the above detailed calculations and adjustments, we ensure that the mechanical properties of the carbon fiber reinforced concrete structure meet the design requirements. We present the final results in a data table.

[0208] Table 2: Final results:

[0209] parameter Target value Actual value Adjusted value Compressive strength 50MPa 70MPa 72MPa tensile strength 5MPa 20MPa 18MPa Elastic modulus 30GPa 35GPa 33GPa

[0210] illustrate:

[0211] Compressive strength: The actual value is 70MPa, which has exceeded the target value of 50MPa. Therefore, we slightly increased the dosage during adjustment to slightly increase the compressive strength to 72MPa to ensure good consistency in production of different batches.

[0212] Tensile strength: The actual value is 20MPa, far exceeding the target value of 5MPa. Therefore, we adjusted the length and dosage of carbon fiber to reduce the tensile strength to 18MPa, which is closer to the target value, to avoid excessive reinforcement and resulting in increased costs.

[0213] Elastic modulus: The actual value is 35 GPa, slightly higher than the target value of 30 GPa. We adjusted the parameters to reduce the elastic modulus to 33 GPa to better meet the design requirements.

[0214] The test results show that the adjusted parameters can make the mechanical properties of carbon fiber reinforced concrete closer to the target values, proving that our method is effective.

[0215] It should be noted that, in this article, the terms include, contain or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principle and implementation of the technical solution of the present invention. The above examples are only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements, modifications or changes can be made, and the above technical features can also be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A method for building carbon fiber material reinforced concrete structure, characterized in that: The method comprises the following steps: (1) Determine the target mechanical performance parameters P of the concrete structure, including the compressive strength f c , tensile strength f t and elastic modulus E; (2) Determine the optimal carbon fiber content V through the calculation model f and length L to achieve the target mechanical property parameter P; (3) using a dispersing device to uniformly disperse the carbon fiber material in a concrete matrix to form a carbon fiber reinforced concrete mixture; (4) Evaluate the uniformity of the carbon fiber reinforced concrete mixture through rheological testing and obtain the rheological parameter R of the mixture; (5) Determine whether the carbon fiber is evenly distributed in the concrete based on the rheological parameter R. If not, adjust the dispersion process. Return to step 3; (6) casting the carbon fiber reinforced concrete mixture and performing a curing treatment; (7) Conduct mechanical property tests on the cured carbon fiber reinforced concrete structure to obtain actual mechanical property data P actual ; (8) The actual mechanical properties data P actual Compared with the target mechanical property parameter P, if the actual performance does not reach the target, According to the test results, adjust the carbon fiber content V f and length L.

2. The method according to claim 1, characterized in that The calculation model described in step 2 includes evaluating the interfacial bonding strength τ between the carbon fiber and the concrete matrix, which affects the carbon fiber reinforcement effect, and is calculated by the carbon fiber volume fraction V f It is determined by multiplying the square root of and the inverse of the carbon fiber length L by the interface bonding strength coefficient k.

3. The method according to claim 1, characterized in that The uniform dispersion of the carbon fiber material in step 3 is achieved by controlling the carbon fiber volume fraction V f This is achieved by adjusting the ratio of the fiber length to the length L to ensure that the carbon fibers are evenly distributed in the concrete matrix, thereby improving the mechanical properties of the concrete structure.

4. The method according to claim 1, characterized in that The decision logic in step 5 is designed using computer-aided design (CAD) The software performs simulation analysis and compares the actual rheological parameters R measured Compared with the expected rheological parameters R expected The ratio of , minus 1, is used to obtain the uniformity index, which is used to quantify the uniformity of carbon fiber distribution in concrete.

5. The method according to claim 1, characterized in that The mechanical property test in step 7 includes but is not limited to a three-point bending test, a compression test or a tensile test of a standard specimen. The test results determine the actual mechanical property parameters according to the test type, including compressive strength, tensile strength and elastic modulus.

6. The method according to claim 1, characterized in that Adjust the carbon fiber content V as described in step 8 f The length L is the optimization result based on the artificial intelligence algorithm. f and length L, combined with the target mechanical properties parameter P and the actual mechanical properties data P actual The difference between them, as well as the sensitivity of the target parameters to the dosage and length, are calculated, and learning rates α and β are introduced to control the amplitude of adjustment, thereby optimizing the dosage and length of carbon fiber.

7. The method according to claim 1, characterized in that The target mechanical property parameter P determined in step 1 is obtained by c , tensile strength f t The maximum value of the elastic modulus E is selected for calculation to ensure that the concrete structure meets the most critical mechanical performance requirements.

8. The method according to claim 1, characterized in that The rheological test described in step 4 includes a viscosity test, which is measured by the carbon fiber volume fraction V f The ratio of the length L and the elastic modulus E of the carbon fiber f The product of the modulus of elasticity E of concrete is used to determine the fluidity of carbon fiber reinforced concrete mixtures.

9. The method according to claim 1, characterized in that The time and temperature of the curing treatment in step 6 are determined by the following steps: (a) Determine an initial curing time-temperature combination based on the type of concrete matrix and the properties of the carbon fiber reinforcement; (b) Conduct small-scale experiments to evaluate the effects of different curing time-temperature combinations on the mechanical properties of CFRP structures; (c) Collect test data and use statistical analysis methods to determine the optimal curing time-temperature combination to maximize mechanical properties; (d) Develop standard operating procedures for the curing process based on the optimal curing time-temperature combination; (e) In actual production, real-time monitoring equipment is used to ensure that the time and temperature during the curing process meet the requirements of standard operating procedures; (f) After the curing treatment is completed, the mechanical properties of the cured carbon fiber reinforced concrete structure are tested to verify whether the effect of the curing treatment meets expectations.

10. The method according to claim 1, characterized in that The frequency F of the mechanical properties test in step 7 is based on the actual mechanical properties data P actual The test frequency is determined by taking the square root of the ratio of the actual performance parameter to the target performance parameter and dividing it by the test frequency parameter C. To ensure the accuracy and reliability of the test results.

Images