Method and system for evaluating anti-permeability performance of anti-rust microcapsule of reinforced concrete
By automatically treating the rust resist raw materials and mixing them with cement, combined with compressive strength testing and electrical flux testing, the problem of lack of standard anti-seepage performance evaluation methods in the existing technology is solved, and the accurate performance evaluation of rust resisting microcapsules in reinforced concrete is achieved.
Patent Information
- Application Number
- CN202510325195.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2025-05-13
AI Technical Summary
There is a lack of standard and effective method for evaluating anti-seepage performance in the prior art, and it is difficult to accurately evaluate the anti-seepage performance of rust-resistant microcapsules in reinforced concrete.
By automatically pretreating, emulsifying, microcapsule encapsulation and drying the raw materials of the rust inhibitor, collecting the rust inhibiting microcapsules and mixing them with cement for standard maintenance, pre-damage treatment and self-repair treatment, standard samples, pre-damage samples, pre-damage mortar and self-repair mortar are obtained. Then, these samples were subjected to compressive strength test and electrical flux test, intensity recovery rate, anti-permeability recovery rate and anti-permeability repair rate, and self-healing performance evaluation and anti-permeability evaluation were performed.
It realizes standard and effective anti-seepage performance evaluation, can accurately obtain test evaluation results, and improves the accuracy and efficiency of performance evaluation of rust-resisting microcapsules in reinforced concrete.
Smart Images
Figure CN119985265A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of rust-proof microcapsules, and in particular relates to a method and a system for evaluating the anti-permeability performance of rust-proof microcapsules for reinforced concrete. Background Art
[0002] The highly alkaline porous solution formed by cement hydration products forms a dense passivation film on the surface of steel bars, protecting the steel bars inside cement-based materials from the corrosion of corrosive substances. However, cement-based materials are inevitably prone to microcracks during use. Microcracks enhance the permeability of cement-based materials and provide a more direct permeation transmission path for the accelerated invasion of chloride ions. When chloride ions diffuse to the surface of steel bars and exceed the concentration threshold, the passivation film becomes unstable, and then induces steel corrosion under the synergistic effect of water and oxygen. Steel corrosion reduces the durability of cement-based materials and even causes premature failure.
[0003] Rust-inhibiting microcapsules are microscopic inclusions that contain rust inhibitors inside and are surrounded by polymer wall materials. This microcapsule technology achieves the slow release and sustained effect of rust inhibitors in concrete by encapsulating the rust inhibitors in tiny capsules.
[0004] In the prior art, there is no standard and effective method for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete. Only time-consuming and complicated long-term monitoring and evaluation can be carried out. Therefore, it is difficult to obtain accurate test and evaluation results. Summary of the invention
[0005] The purpose of the embodiments of the present invention is to provide a method and system for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete, aiming to solve the problems raised in the background technology.
[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: The present invention discloses a method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete, and the method specifically comprises the following steps: Carry out automatic pretreatment, emulsification, microencapsulation and drying of the rust inhibitor raw materials, and collect the rust inhibitor microcapsules; The rust-inhibiting microcapsules are mixed with cement, and then subjected to standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; Performing compressive strength tests on the standard specimen and the pre-damaged specimen, and calculating strength recovery rate; Conducting an electric flux test on the pre-damaged mortar and the self-repairing mortar to calculate the anti-permeability recovery rate and the anti-permeability repair rate; According to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, a self-healing performance evaluation and an anti-permeability performance evaluation are performed to generate evaluation record information.
[0007] The present invention discloses a system for evaluating the anti-seepage performance of rust-proof microcapsules for reinforced concrete, the system comprising a microcapsule processing unit, a sample mortar processing unit, a compressive strength testing unit, an electric flux testing unit and a performance evaluation recording unit, wherein: The microcapsule processing unit is used to automatically pre-treat, emulsify, encapsulate and dry the rust inhibitor raw materials, and collect the rust inhibitor microcapsules; A sample mortar processing unit is used to mix the rust-inhibiting microcapsules with cement, and then perform standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; A compressive strength testing unit, used to perform compressive strength testing on the standard specimen and the pre-damaged specimen, and calculate the strength recovery rate; An electric flux testing unit, used to perform an electric flux test on the pre-damaged mortar and the self-repairing mortar, and calculate an anti-permeability recovery rate and an anti-permeability repair rate; The performance evaluation recording unit is used to perform self-healing performance evaluation and anti-permeability performance evaluation according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and generate evaluation record information.
[0008] Compared with the prior art, the present invention has the following beneficial effects: The embodiment of the present invention obtains standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; performs compressive strength tests on standard samples and pre-damaged samples to calculate the strength recovery rate; performs electric flux tests on pre-damaged mortars and self-repairing mortars to calculate the anti-permeability recovery rate and the anti-permeability repair rate; performs self-healing performance evaluation and anti-permeability performance evaluation, and generates evaluation record information. It is possible to perform compressive strength tests on standard samples and pre-damaged samples to calculate the strength recovery rate, perform electric flux tests on pre-damaged mortars and self-repairing mortars to calculate the anti-permeability recovery rate and the anti-permeability repair rate, perform self-healing performance evaluation and anti-permeability performance evaluation, generate evaluation record information, achieve standard and effective anti-permeability performance evaluation, and obtain accurate test evaluation results. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.
[0010] Figure 1A flow chart of a method provided by an embodiment of the present invention is shown.
[0011] Figure 2 A flow chart of processing and collecting rust-inhibiting microcapsules in the method provided in an embodiment of the present invention is shown.
[0012] Figure 3 A flow chart of obtaining a standard specimen, a pre-damaged specimen, a pre-damaged mortar and a self-repairing mortar in the method provided in an embodiment of the present invention is shown.
[0013] Figure 4 A flow chart of compressive strength testing in the method provided in an embodiment of the present invention is shown.
[0014] Figure 5 A flow chart of performing electric flux test processing in the method provided by an embodiment of the present invention is shown.
[0015] Figure 6 A flow chart of generating evaluation record information in the method provided in an embodiment of the present invention is shown.
[0016] Figure 7 The application architecture diagram of the system provided by the embodiment of the present invention is shown.
[0017] Figure 8 The structure block diagram of the microcapsule processing unit in the system provided by the embodiment of the present invention is shown. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0019] It is understandable that the rust-resistant microcapsule is a micro-inclusion, which contains a rust inhibitor inside and is wrapped by a wall material made of polymer materials on the outside. This microcapsule technology achieves the slow release and continuous action of the rust inhibitor in concrete by encapsulating the rust inhibitor in tiny capsules. In the prior art, there is no standard and effective way to evaluate the anti-permeability performance of rust-resistant microcapsules for reinforced concrete. Only time-consuming and complicated long-term monitoring and evaluation can be carried out. Therefore, it is difficult to obtain accurate test evaluation results.
[0020] To solve the above problems, the embodiment of the present invention collects rust-resistant microcapsules by automatically pre-treating, emulsifying, encapsulating and drying the raw materials of the rust inhibitor; mixes the rust-resistant microcapsules with cement, and then performs standard maintenance, different pre-damage treatments and different self-repair treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; performs compressive strength tests on standard samples and pre-damaged samples, and calculates the strength recovery rate; performs electrical flux tests on pre-damaged mortars and self-repairing mortars, and calculates the anti-permeability recovery rate and the anti-permeability repair rate; performs self-healing performance evaluation and anti-permeability performance evaluation according to the strength recovery rate, anti-permeability recovery rate and anti-permeability repair rate, and generates evaluation record information. It is possible to perform compressive strength tests on standard samples and pre-damaged samples, calculate the strength recovery rate, perform electrical flux tests on pre-damaged mortars and self-repairing mortars, calculate the anti-permeability recovery rate and the anti-permeability repair rate, perform self-healing performance evaluation and anti-permeability performance evaluation, generate evaluation record information, realize standard and effective anti-permeability performance evaluation, and obtain accurate test evaluation results.
[0021] Figure 1 A flow chart of a method provided by an embodiment of the present invention is shown.
[0022] Specifically, the method for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete comprises the following steps: Step S101, performing automated pretreatment, emulsification, microencapsulation and drying on the rust inhibitor raw material, and collecting rust inhibitor microcapsules.
[0023] In an embodiment of the present invention, the rust inhibitor raw material is ground to a desired particle size, and the wall material raw material is dissolved in a solvent to form a uniform wall material solution, and then the rust inhibitor solution and the wall material solution are emulsified to generate a microemulsion. Thereafter, microencapsulation parameters (including spray speed, drying temperature and air intake volume) are set to control the morphology and stability of the microcapsules, the microemulsion is microencapsulated, and then separated and collected, and automatic drying adjustment (adjusting drying temperature and time) is performed to remove residual solvent and moisture to obtain rust-inhibiting microcapsules.
[0024] Specifically, Figure 2 A flow chart of processing and collecting rust-inhibiting microcapsules in the method provided in an embodiment of the present invention is shown.
[0025] Among them, in the preferred embodiment provided by the present invention, the rust inhibitor raw material is subjected to automated pretreatment, emulsification treatment, microencapsulation treatment and drying treatment, and the collection of rust-inhibiting microcapsules specifically includes the following steps: Step S1011, grinding the rust inhibitor raw material, and stirring and dissolving it to generate a rust inhibitor solution; Step S1012, emulsifying the rust inhibitor solution to generate a microemulsion; Step S1013, setting microencapsulation parameters, and performing microencapsulation treatment on the microemulsion; Step S1014, separation and collection are performed, and automatic drying and adjustment are performed to obtain rust-inhibiting microcapsules.
[0026] Among them, in the preferred embodiment provided by the present invention, the setting of microencapsulation parameters and microencapsulation of the microemulsion specifically include the following steps: In the initial nucleation stage, the mixture was stirred at a stirring rate of 200-300 rpm for 13 to 17 minutes, and the pH value of the system was controlled at 4.5 using a 0.1 mol / L citric acid buffer solution, and the temperature was maintained at 30°C to form a preliminary capsule wall; In the gradient control stage, 0.1 mol / L citric acid buffer was used for control, and the pH value of the system was increased linearly at 0.165 / min to increase to 6.5; Then, the pH value of the system was increased linearly at 0.165 / min to 8.5, and the temperature was increased stepwise to 50°C at a rate of 4°C every 5 minutes, and the stirring rate was increased to 600 rpm according to the heating time; After the temperature is raised, the mixture is stirred at a rate of 600 rpm for 10 min to complete the stirring and shaping. In the particle size control stage, the solution was preheated at 55°C for 5 minutes. After preheating, the solution was centrifuged at 2000 rpm for 10 minutes. The particle size distribution of the microcapsules was controlled to be ≤5 μm by centrifugal force. After centrifugation, the solution was kept at 55°C for 10 minutes to generate a microemulsion.
[0027] In the above scheme, the present invention changes the Zeta potential of the capsule wall material from +15mV to -25mV through a linear gradient of pH from acidic to alkaline, resulting in an electrostatic repulsion → attraction transition, driving the capsule wall material to deposit in an orderly manner at the microemulsion interface. Exponential acceleration (rate = 250×1.1^time) stirring superimposed step temperature increase (30→50℃) is used to increase the Reynolds number from 1200 (laminar flow) to 8500 (turbulent flow), and the mass transfer coefficient is increased by about 6.2 times (calculation formula: k=0.13*(ρN D² / μ)^0.8), ensuring uniform thickening of the capsule wall.
[0028] Furthermore, the method for evaluating the anti-permeability performance of the rust-resistant microcapsules for reinforced concrete further comprises the following steps: Step S102, mixing the rust-inhibiting microcapsules with cement, and then performing standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars.
[0029] In an embodiment of the present invention, the rust-resistant microcapsules are mixed with cement according to a preset mixing ratio (3%, 6% or 9%), and a water-cement ratio of 0.35 is used to form a cement slurry sample, and the cement slurry sample is subjected to different treatments. Specifically, part of the cement slurry samples are continuously cured for 28 days to obtain standard samples; part of the cement slurry samples are subjected to standard curing for 7 days, and then pre-damage treatment is performed (pre-damage stress of 40%, 60% and 80% of the maximum compressive strength is applied to generate microcracks in the cement slurry samples), and then placed in a standard curing box for continuous hydration for 7 days to obtain pre-damaged samples; part of the cement slurry samples are continuously cured for 28 days, and then pre-damage treatment is performed (pre-damage stress of 50% of the maximum compressive strength is applied) to obtain pre-damaged mortar; part of the cement slurry samples are continuously cured for 28 days, and then pre-damage treatment is performed (pre-damage stress of 50% of the maximum compressive strength is applied), and then moved to a standard curing box for 7 days. After self-repair at age d, self-repairing mortar is obtained.
[0030] Specifically, Figure 3 A flow chart of obtaining a standard specimen, a pre-damaged specimen, a pre-damaged mortar and a self-repairing mortar in the method provided in an embodiment of the present invention is shown.
[0031] Among them, in the preferred embodiment provided by the present invention, the rust-inhibiting microcapsules are mixed with cement, and then standard curing, different pre-damage treatments and different self-repairing treatments are performed to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars, which specifically include the following steps: Step S1021, mixing the rust-inhibiting microcapsules with cement according to a preset mixing ratio to generate a cement paste sample; Step S1022, curing the cement paste sample for 28 days to obtain a standard sample; Step S1023, subjecting the cement paste sample to standard curing for 7 days, and then subjecting it to pre-damage treatment, and then continuing hydration for 7 days to obtain a pre-damage sample; Step S1024, subjecting the cement paste sample to continuous curing for 28 days, and then subjecting it to pre-damage treatment to obtain pre-damaged mortar; Step S1025, the cement paste sample is continuously cured for 28 days, and then pre-damaged and self-repaired for 7 days to obtain a self-repairing mortar.
[0032] Furthermore, the method for evaluating the anti-permeability performance of the rust-resistant microcapsules for reinforced concrete further comprises the following steps: Step S103, performing compressive strength test on the standard sample and the pre-damaged sample, and calculating the strength recovery rate.
[0033] In the embodiment of the present invention, a compressive strength test is performed on a standard sample to obtain a first compressive strength, and a compressive strength test is performed on a pre-damaged sample to obtain a second compressive strength, and then the strength recovery rate is calculated according to the first compressive strength and the second compressive strength. Specifically, the calculation formula of the strength recovery rate is: ; in, is the strength recovery rate, is the first compressive strength, The second compressive strength.
[0034] Specifically, Figure 4 A flow chart of compressive strength testing in the method provided in an embodiment of the present invention is shown.
[0035] Among them, in the preferred embodiment provided by the present invention, the compressive strength test of the standard sample and the pre-damaged sample is performed, and the strength recovery rate is calculated, which specifically includes the following steps: Step S1031, performing a compressive strength test on the standard sample to obtain a first compressive strength; Step S1032, performing a compressive strength test on the pre-damaged sample to obtain a second compressive strength; Step S1033: calculating the strength recovery rate according to the first compressive strength and the second compressive strength.
[0036] Among them, in the preferred embodiment provided by the present invention, the calculation of the strength recovery rate according to the first compressive strength and the second compressive strength specifically includes the following steps: Get the self-repair action time; Prepare multiple groups of samples with the same ratio and set the self-repair time gradient; According to the set self-repair time gradient, the average strength recovery rate and standard deviation of each time gradient are obtained; Based on the diffusion characteristics of the repair agent released by the ruptured microcapsules, the first-order kinetic equation was used to describe the change law of the recovery rate, and the first-order kinetic equation was converted into a recursive formula that increases by days to obtain a discrete model. Given a reference range of rate constants, select the median of the reference range of rate constants as the initial guess of the rate constant; Substitute the initial guess value into the discrete model, calculate the theoretical recovery rate prediction value according to the time gradient, and compare it point by point with the average strength recovery rate of the time gradient to obtain the first difference; Square all the first differences and sum them to get the total error index under the current parameters; The Levenberg-Marquardt optimization algorithm was used to adjust the k value along the direction of error decrease for optimization. After the optimization was completed, the optimal rate constant was obtained. According to the self-repairing time and the optimal rate constant, the Sigmoid function is used to calculate the value of the time-varying efficiency correction factor; Obtain the incorporation concentration of the rust-inhibiting microcapsules, and obtain the value of the synergistic gain coefficient according to the experimental calibration curve; The initial strength recovery rate is calculated using the first compressive strength and the second compressive strength, and the initial strength recovery rate is corrected using the time-varying efficiency correction factor value and the synergy gain coefficient value to obtain the strength recovery rate.
[0037] In the above scheme, the present invention introduces the influence of repair time, so that the calculation of the recovery rate is not only based on the strength ratio, but also takes into account the time factor, and establishes a quantitative relationship between the recovery rate and the amount of microcapsules, which can effectively eliminate the problem of falsely high strength caused by the inhibition of the inactivation of microcapsules in the early stage of the traditional method. Furthermore, the anti-seepage performance evaluation method of the rust-proof microcapsules of reinforced concrete also includes the following steps: Step S104, performing an electrical flux test on the pre-damaged mortar and the self-repairing mortar, and calculating an anti-permeability recovery rate and an anti-permeability repair rate.
[0038] In the embodiment of the present invention, the initial electric flux is recorded, the electric flux test is performed on the pre-damaged mortar to obtain the first test electric flux, and the electric flux test is performed on the self-repairing mortar to obtain the second test electric flux, and then the anti-permeability recovery rate and the anti-permeability repair rate are calculated according to the initial electric flux, the first test electric flux and the second test electric flux. Specifically, the calculation formula of the anti-permeability recovery rate is: ; in, is the anti-permeability recovery rate, is the initial electric flux, for the second test electric flux; The calculation formula of anti-permeability repair rate is: ; in, is the anti-permeability repair rate, For the first test electrical flux.
[0039] Specifically, Figure 5 A flow chart of performing electric flux test processing in the method provided by an embodiment of the present invention is shown.
[0040] Among them, in the preferred embodiment provided by the present invention, the electric flux test is performed on the pre-damaged mortar and the self-repairing mortar, and the calculation of the anti-permeability recovery rate and the anti-permeability repair rate specifically includes the following steps: Step S1041, recording the initial electric flux; Step S1042, performing an electric flux test on the pre-damaged mortar to obtain a first test electric flux; Step S1043, performing an electric flux test on the self-repairing mortar to obtain a second test electric flux; Step S1044, calculating the anti-permeability recovery rate and the anti-permeability repair rate according to the initial electrical flux, the first test electrical flux and the second test electrical flux.
[0041] Among them, in the preferred embodiment provided by the present invention, the calculation of the anti-permeability recovery rate according to the initial electric flux, the first test electric flux and the second test electric flux specifically includes the following steps: Obtaining an initial electric flux, and using the initial electric flux as a reference electric flux; Obtaining a first test electric flux, and calculating an absolute value of a change in a reference electric flux and the first test electric flux; The linear recovery rate is calculated using the absolute value of the change and the reference current amount; Calculating a first ratio of the reference electric flux to the first test electric flux, and applying a hyperbolic tangent function to the first ratio to obtain a nonlinear correction factor; The linear recovery rate is combined with the nonlinear correction factor to obtain the corrected recovery rate, and the corrected recovery rate is converted into a percentage to obtain the anti-permeability recovery rate.
[0042] In the above scheme, the present invention sets up a nonlinear error correction mechanism, and realizes the intelligent correction of "attenuation in high value area-fidelity in low value area" through the hyperbolic tangent function, so as to automatically reduce the calculation sensitivity, avoid the false high error caused by traditional methods, maintain the original linear relationship, and ensure the accuracy of normal working conditions.
[0043] Among them, in the preferred embodiment provided by the present invention, the calculation of the anti-permeability repair rate according to the initial electric flux, the first test electric flux and the second test electric flux specifically includes the following steps: Obtaining a second test electric flux, and calculating a second difference between the first test electric flux and the second test electric flux; The basic repair rate is calculated according to the second difference and the first test electric flux; Obtaining microcapsule wall thickness data, and determining an interface repair gain coefficient by looking up a wall thickness lookup table according to the microcapsule wall thickness data; The pore closure rate constant is determined by mercury injection pore structure analysis, a second ratio of the second test electric flux to the reference electric flux is calculated, a negative exponential operation is performed on the second ratio, and the negative exponential operation result is combined with the pore closure rate constant to obtain a pore closure coefficient; The basic repair rate is fused with the pore closure coefficient, and the fusion result is adjusted using the interface repair gain coefficient to synthesize the final repair rate and obtain the anti-permeability repair rate.
[0044] In the above scheme, a dynamic gain compensation mechanism is set up, and the time-varying coupling of "repair process-pore closure" is realized by introducing an exponential function. When the second test electric flux is less than the reference electric flux, the gain compensation is automatically activated. When the second test electric flux increase is too low for a long time, the microcapsule replenishment instruction is triggered.
[0045] Furthermore, the method for evaluating the anti-permeability performance of the rust-resistant microcapsules for reinforced concrete further comprises the following steps: Step S105, performing self-healing performance evaluation and anti-permeability performance evaluation according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and generating evaluation record information.
[0046] In an embodiment of the present invention, the strength recovery rate is evaluated for self-healing performance according to preset self-healing standard evaluation information to obtain self-healing evaluation information, and the anti-permeability recovery rate and the anti-permeability repair rate are evaluated for anti-permeability performance according to preset anti-permeability standard evaluation information to obtain anti-permeability evaluation information, and the evaluation record information is generated by comprehensively arranging the self-healing evaluation information and the anti-permeability evaluation information.
[0047] Specifically, Figure 6 A flow chart of generating evaluation record information in the method provided in an embodiment of the present invention is shown.
[0048] Among them, in the preferred embodiment provided by the present invention, the self-healing performance evaluation and the anti-permeability performance evaluation are performed according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and the generation of the evaluation record information specifically includes the following steps: Step S1051, performing a self-healing performance evaluation on the strength recovery rate according to preset self-healing standard evaluation information to obtain self-healing evaluation information; Step S1052, performing an anti-permeability performance evaluation on the anti-permeability recovery rate and the anti-permeability repair rate according to preset anti-permeability standard evaluation information, and obtaining anti-permeability evaluation information; Step S1053, comprehensively sorting out the self-healing evaluation information and the anti-seepage evaluation information to generate evaluation record information.
[0049] Furthermore, Figure 7 The application architecture diagram of the system provided by the embodiment of the present invention is shown.
[0050] Among them, in another preferred embodiment provided by the present invention, the anti-permeability performance evaluation system of the anti-rust microcapsules of reinforced concrete includes: The microcapsule processing unit 101 is used to automatically perform pretreatment, emulsification, microcapsulation and drying on the rust inhibitor raw material, and collect the rust inhibitor microcapsules.
[0051] In the embodiment of the present invention, the microcapsule processing unit 101 grinds the rust inhibitor raw material to a desired particle size, and dissolves the wall material raw material in a solvent to form a uniform wall material solution, and then emulsifies the rust inhibitor solution and the wall material solution to generate a microemulsion. Thereafter, the microcapsule encapsulation parameters (including spray speed, drying temperature and air intake volume) are set to control the morphology and stability of the microcapsules, the microemulsion is encapsulated, and then separated and collected, and automatic drying adjustment (adjusting the drying temperature and time) is performed to remove residual solvents and moisture to obtain rust-inhibiting microcapsules.
[0052] Specifically, Figure 8 The structure block diagram of the microcapsule processing unit 101 in the system provided by the embodiment of the present invention is shown.
[0053] In a preferred embodiment of the present invention, the microcapsule processing unit 101 specifically includes: The grinding and dissolving processing module 1011 is used to grind the rust inhibitor raw material, stir and dissolve it, and generate a rust inhibitor solution; An emulsification treatment module 1012 is used to emulsify the rust inhibitor solution to generate a microemulsion; The encapsulation processing module 1013 is used to set microcapsulation parameters and perform microcapsulation processing on the microemulsion; The separation and drying module 1014 is used to separate and collect, and perform automatic drying adjustment to obtain rust-inhibiting microcapsules.
[0054] Furthermore, the anti-seepage performance evaluation system of the rust-proof microcapsules for reinforced concrete also includes: The sample mortar processing unit 102 is used to mix the rust-inhibiting microcapsules with cement, and then perform standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortar and self-repairing mortar.
[0055] In the embodiment of the present invention, the sample mortar processing unit 102 mixes the rust-resistant microcapsules with cement according to a preset mixing ratio (3%, 6% or 9%), and forms the mixture using a water-binder ratio of 0.35 to generate a cement paste sample. The cement paste sample is subjected to different treatments. Specifically, part of the cement paste sample is continuously cured for 28 days to obtain a standard sample; part of the cement paste sample is subjected to standard curing for 7 days. After d age, pre-damage treatment was carried out (pre-damage stress of 40%, 60% and 80% of the maximum compressive strength was applied to produce microcracks in the cement paste specimens), and then placed in a standard curing box for continuous hydration for 7d to obtain pre-damaged specimens; part of the cement paste specimens was continuously cured for 28d and then pre-damage treatment was carried out (pre-damage stress of 50% of the maximum compressive strength was applied) to obtain pre-damaged mortar; part of the cement paste specimens was continuously cured for 28d and then pre-damage treatment was carried out (pre-damage stress of 50% of the maximum compressive strength was applied), and then moved to a standard curing box for self-repair for 7d to obtain self-repairing mortar.
[0056] The compressive strength testing unit 103 is used to perform compressive strength testing on the standard sample and the pre-damaged sample, and calculate the strength recovery rate.
[0057] In the embodiment of the present invention, the compressive strength testing unit 103 performs a compressive strength test on the standard sample to obtain a first compressive strength, and performs a compressive strength test on the pre-damaged sample to obtain a second compressive strength, and then calculates the strength recovery rate according to the first compressive strength and the second compressive strength. Specifically, the calculation formula of the strength recovery rate is: ; in, is the strength recovery rate, is the first compressive strength, The second compressive strength.
[0058] The electric flux testing unit 104 is used to perform an electric flux test on the pre-damaged mortar and the self-repairing mortar to calculate the anti-permeability recovery rate and the anti-permeability repair rate.
[0059] In the embodiment of the present invention, the electric flux testing unit 104 records the initial electric flux, performs an electric flux test on the pre-damaged mortar to obtain a first test electric flux, and performs an electric flux test on the self-repairing mortar to obtain a second test electric flux, and then calculates the anti-permeability recovery rate and the anti-permeability repair rate according to the initial electric flux, the first test electric flux and the second test electric flux. Specifically, the calculation formula of the anti-permeability recovery rate is: ; in, is the anti-permeability recovery rate, is the initial electric flux, for the second test electric flux; The calculation formula of anti-permeability repair rate is: ; in, is the anti-permeability repair rate, For the first test electrical flux.
[0060] The performance evaluation recording unit 105 is used to perform self-healing performance evaluation and anti-permeability performance evaluation according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and generate evaluation record information.
[0061] In an embodiment of the present invention, the performance evaluation recording unit 105 performs a self-healing performance evaluation on the strength recovery rate according to preset self-healing standard evaluation information to obtain self-healing evaluation information, and performs an anti-permeability performance evaluation on the anti-permeability recovery rate and the anti-permeability repair rate according to preset anti-permeability standard evaluation information to obtain anti-permeability evaluation information, and generates evaluation record information by comprehensively arranging the self-healing evaluation information and the anti-permeability evaluation information.
[0062] It should be understood that, although each step in the flow chart of each embodiment of the present invention is shown in sequence according to the indication of the arrow, these steps are not necessarily performed in sequence according to the order indicated by the arrow. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be performed in other orders. Moreover, at least a portion of the steps in each embodiment may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.
[0063] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.
[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete, characterized in that: The method specifically comprises the following steps: Carry out automatic pretreatment, emulsification, microencapsulation and drying of the rust inhibitor raw materials, and collect the rust inhibitor microcapsules; The rust-inhibiting microcapsules are mixed with cement, and then subjected to standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; Performing compressive strength tests on the standard specimen and the pre-damaged specimen, and calculating strength recovery rate; Conducting an electric flux test on the pre-damaged mortar and the self-repairing mortar to calculate the anti-permeability recovery rate and the anti-permeability repair rate; According to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, a self-healing performance evaluation and an anti-permeability performance evaluation are performed to generate evaluation record information; The process of automatically pre-treating, emulsifying, encapsulating and drying the raw material of the rust inhibitor and collecting the rust-inhibiting microcapsules specifically comprises the following steps: Grinding the rust inhibitor raw material, stirring and dissolving it, and generating a rust inhibitor solution; emulsifying the rust inhibitor solution to generate a microemulsion; Setting microencapsulation parameters to perform microencapsulation on the microemulsion; The rust-inhibiting microcapsules are obtained by separation and collection and automatic drying and adjustment.
2. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 1, characterized in that: The setting of microencapsulation parameters and microencapsulation of the microemulsion specifically comprises the following steps: In the initial nucleation stage, the mixture was stirred at a stirring rate of 200-300 rpm for 13 to 17 minutes, and the pH value of the system was controlled at 4.5 using a 0.1 mol / L citric acid buffer solution, and the temperature was maintained at 30°C to form a preliminary capsule wall; In the gradient control stage, 0.1 mol / L citric acid buffer was used for control, and the pH value of the system was increased linearly at 0.165 / min to increase to 6.
5. Then, the pH value of the system was increased linearly at 0.165 / min to 8.5, and the temperature was increased stepwise to 50°C at a rate of 4°C every 5 minutes, and the stirring rate was increased to 600 rpm according to the heating time; After the temperature is raised, the mixture is stirred at a rate of 600 rpm for 10 min to complete the stirring and shaping. In the particle size control stage, the solution was preheated at 55°C for 5 minutes. After preheating, the solution was centrifuged at 2000 rpm for 10 minutes. The particle size distribution of the microcapsules was controlled to be ≤5 μm by centrifugal force. After centrifugation, the solution was kept at 55°C for 10 minutes to generate a microemulsion.
3. The method for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete according to claim 2, characterized in that: The method of mixing the rust-inhibiting microcapsules with cement, and then performing standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars specifically includes the following steps: According to the preset mixing ratio, the rust-inhibiting microcapsules are mixed with cement to generate a cement paste sample; The cement paste sample is continuously cured for 28 days to obtain a standard sample; The cement paste sample is subjected to standard curing for 7 days, and then subjected to pre-damage treatment, and then continuously hydrated for 7 days to obtain a pre-damage sample; The cement paste sample is continuously cured for 28 days, and then subjected to a pre-damage treatment to obtain a pre-damaged mortar; The cement paste sample was continuously cured for 28 days, and then pre-damaged and self-repaired for 7 days to obtain a self-repairing mortar.
4. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 3, characterized in that: The compressive strength test of the standard sample and the pre-damaged sample and the calculation of the strength recovery rate specifically include the following steps: Performing a compressive strength test on the standard sample to obtain a first compressive strength; Performing a compressive strength test on the pre-damaged sample to obtain a second compressive strength; A strength recovery rate is calculated according to the first compressive strength and the second compressive strength.
5. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 4, characterized in that: The calculating of the strength recovery rate according to the first compressive strength and the second compressive strength specifically comprises the following steps: Get the self-repair action time; Prepare multiple groups of samples with the same ratio and set the self-repair time gradient; According to the set self-repair time gradient, the average strength recovery rate and standard deviation of each time gradient are obtained; Based on the diffusion characteristics of the repair agent released by the ruptured microcapsules, the first-order kinetic equation was used to describe the change law of the recovery rate, and the first-order kinetic equation was converted into a recursive formula that increases by days to obtain a discrete model. Given a reference range of rate constants, select the median of the reference range of rate constants as the initial guess of the rate constant; Substitute the initial guess value into the discrete model, calculate the theoretical recovery rate prediction value according to the time gradient, and compare it point by point with the average strength recovery rate of the time gradient to obtain the first difference; Square all the first differences and sum them to get the total error index under the current parameters; The Levenberg-Marquardt optimization algorithm was used to adjust the k value along the direction of error decrease for optimization. After the optimization was completed, the optimal rate constant was obtained. According to the self-repairing time and the optimal rate constant, the Sigmoid function is used to calculate the value of the time-varying efficiency correction factor; Obtain the incorporation concentration of the rust-inhibiting microcapsules, and obtain the value of the synergistic gain coefficient according to the experimental calibration curve; The initial strength recovery rate is calculated using the first compressive strength and the second compressive strength, and the initial strength recovery rate is corrected using the time-varying efficiency correction factor value and the synergy gain coefficient value to obtain the strength recovery rate.
6. The method for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete according to claim 5, characterized in that: The electric flux test of the pre-damaged mortar and the self-repairing mortar and the calculation of the anti-permeability recovery rate and the anti-permeability repair rate specifically comprises the following steps: Record the initial electric flux; Performing an electric flux test on the pre-damaged mortar to obtain a first test electric flux; Performing an electric flux test on the self-repairing mortar to obtain a second test electric flux; The anti-permeability recovery rate and the anti-permeability repair rate are calculated according to the initial electrical flux, the first test electrical flux and the second test electrical flux.
7. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 6, characterized in that: The step of calculating the anti-permeability recovery rate according to the initial electric flux, the first test electric flux and the second test electric flux specifically comprises the following steps: Obtaining an initial electric flux, and using the initial electric flux as a reference electric flux; Obtaining a first test electric flux, and calculating an absolute value of a change in a reference electric flux and the first test electric flux; The linear recovery rate is calculated using the absolute value of the change and the reference current amount; Calculating a first ratio of the reference electric flux to the first test electric flux, and applying a hyperbolic tangent function to the first ratio to obtain a nonlinear correction factor; The linear recovery rate is combined with the nonlinear correction factor to obtain the corrected recovery rate, and the corrected recovery rate is converted into a percentage to obtain the anti-permeability recovery rate.
8. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 6, characterized in that: The step of calculating the anti-permeability repair rate according to the initial electric flux, the first test electric flux and the second test electric flux specifically comprises the following steps: Obtaining a second test electric flux, and calculating a second difference between the first test electric flux and the second test electric flux; The basic repair rate is calculated according to the second difference and the first test electric flux; Obtaining microcapsule wall thickness data, and determining an interface repair gain coefficient by looking up a wall thickness lookup table according to the microcapsule wall thickness data; The pore closure rate constant is determined by mercury injection pore structure analysis, a second ratio of the second test electric flux to the reference electric flux is calculated, a negative exponential operation is performed on the second ratio, and the negative exponential operation result is combined with the pore closure rate constant to obtain a pore closure coefficient; The basic repair rate is fused with the pore closure coefficient, and the fusion result is adjusted using the interface repair gain coefficient to synthesize the final repair rate and obtain the anti-permeability repair rate.
9. The method for evaluating the anti-permeability performance of rust-resistant microcapsules for reinforced concrete according to claim 8, characterized in that: The self-healing performance evaluation and the anti-permeability performance evaluation are performed according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and the generation of the evaluation record information specifically comprises the following steps: According to the preset self-healing standard evaluation information, a self-healing performance evaluation is performed on the strength recovery rate to obtain self-healing evaluation information; According to the preset anti-permeability standard evaluation information, the anti-permeability recovery rate and the anti-permeability repair rate are evaluated for anti-permeability performance to obtain anti-permeability evaluation information; The self-healing evaluation information and the anti-seepage evaluation information are comprehensively sorted out to generate evaluation record information.
10. A system for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete, the system being applied to the method for evaluating the anti-seepage performance of rust-resistant microcapsules for reinforced concrete according to any one of claims 1 to 9, characterized in that: The system includes a microcapsule processing unit, a sample mortar processing unit, a compressive strength testing unit, an electric flux testing unit and a performance evaluation recording unit, wherein: The microcapsule processing unit is used to automatically pre-treat, emulsify, encapsulate and dry the rust inhibitor raw materials, and collect the rust inhibitor microcapsules; A sample mortar processing unit is used to mix the rust-inhibiting microcapsules with cement, and then perform standard curing, different pre-damage treatments and different self-repairing treatments to obtain standard samples, pre-damaged samples, pre-damaged mortars and self-repairing mortars; A compressive strength testing unit, used to perform compressive strength testing on the standard specimen and the pre-damaged specimen, and calculate the strength recovery rate; An electric flux testing unit, used to perform an electric flux test on the pre-damaged mortar and the self-repairing mortar, and calculate an anti-permeability recovery rate and an anti-permeability repair rate; The performance evaluation recording unit is used to perform self-healing performance evaluation and anti-permeability performance evaluation according to the strength recovery rate, the anti-permeability recovery rate and the anti-permeability repair rate, and generate evaluation record information.