Permeable natural stone protective agent effect determination and evaluation method based on Kass flux bottle

Abstract

The invention provides a method for determining and evaluating the effect of a permeable natural stone protective agent based on a Kass flux bottle, which comprises the following steps: carrying out a Kass flux bottle water absorption test on the surface of a stone before and after protection for 6-8 hours, and determining and recording the water absorption at different time intervals; firstly, the linear slope of the water absorption capacity and the time square root of the stone within 2 hours (capillary stage) before and after protection is obtained through fitting calculation, and whether the waterproof enhancement effect of the protective agent fails or not is qualitatively judged by comparing the two linear slopes; and calculating the average water absorption rate of the stone before and after protection within 2h-total observation time (permeation and diffusion stage with more stable water absorption), and comparing the difference ratio of the average water absorption rate and the average water absorption rate to quantitatively judge the water permeability reduction rate of the stone after the use of the protective agent so as to evaluate the waterproof enhancement effect of the protective agent. The method is easy and convenient to operate, short in time consumption and scientific and reliable in evaluation, and the waterproof enhancement effect of the protective agent can be reflected and evaluated more truly.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a method for measuring and evaluating the effectiveness of penetrating natural stone protective agents based on a Gaston volumetric flask. Background Technology

[0002] Penetrating natural stone protective agent is a functional material composed of active ingredients such as silicon and fluorine, solvents, and additives. Its active ingredients penetrate the micropores of the stone surface through a penetrating process, forming a hydrophobic protective film. By reducing the penetration of moisture and stains into the stone surface, it achieves a protective effect. When sprayed or brushed onto the surface of natural stone, this material significantly enhances its stain resistance without altering the original color and texture of the stone, providing long-lasting protection. It also effectively inhibits the propagation of micro-cracks and environmental erosion, enhancing the stone's anti-aging properties and durability. It shows promising application prospects in architectural decoration, cultural relic protection, and outdoor stone engineering.

[0003] External pollutants often penetrate porous stone through water, causing water stains, rust stains, and whitening. Therefore, a crucial aspect of using this material to improve the durability of natural stone is its effective enhancement of its water resistance. Currently, laboratory testing of the water resistance of natural stone protective agents mainly refers to the methods specified in GB / T 32837-2016. Specifically, this is characterized by comparing the percentage decrease in water absorption rate of natural stone samples before and after applying the protective agent. The water absorption rate is defined as the percentage change in mass of the natural stone sample after immersion in water for 48 hours relative to its original weight before immersion. This method requires immersion of the entire stone, which is time-consuming, making it difficult to evaluate the water resistance enhancement effect on-site. How to quickly, easily, and effectively evaluate the water resistance enhancement effect of penetrating natural stone protective agents on stone in engineering projects is one of the urgent technical challenges to be solved in the field of stone protection.

[0004] In recent years, some researchers have mainly referred to the German industrial standard DIN52617 and proposed to use a Gaston measuring bottle to test the capillary water absorption rate / coefficient ω of the rock surface to reflect the change in its water absorption capacity before and after the protective treatment, so as to evaluate its waterproof enhancement effect, as shown in Equation (1).

[0005] ω=ΔV / (A * (1) Where ω represents the capillary water absorption rate, typically measured in kg / (m²·h). 0.5 ), ΔV: water absorption (kg / m²), A: sealing area of ​​the measuring bottle in contact with the stone (m²), t: water absorption time (h).

[0006] This method typically involves observing for 2 hours, using the average water absorption rate over 2 hours as the evaluation criterion, and assuming a linear relationship between water absorption and the square root of time. In reality, during the Gaston volumetric flask water absorption test, early water transport is primarily driven by capillary action on the dry stone surface, with negligible effects of head pressure and gravity. Therefore, the water absorption per unit area is linearly related to t0.5. However, before the start of the water absorption test, water must be added to the Gaston volumetric flask to the 0 mark. Due to the influence of the filling speed and the human intervention in adjusting the liquid level to 0, the specimen may have already absorbed some water before the start of the test, negatively impacting the subsequent measurement of the water absorption rate. Furthermore, the entire water absorption process of the stone involves not only capillary action but also penetration and diffusion. Capillary action is mainly controlled by the finest pores, determining how quickly water can enter, while the pore structure determines the range and scale of water penetration and diffusion after entry. The pressure penetration effect under a 10ml water column often begins to dominate after capillary action reaches saturation in the later stages. The superposition of water head pressure and downward gravity causes the water absorption pattern to differ from that in the initial capillary stage. At this point, the water absorption pattern should not strictly follow a linear relationship with the square root of time. Moreover, the water absorption increment process in the penetration and diffusion stage is not affected by human factors. In the process of characterizing the waterproofing enhancement effect of penetrating natural stone protective agents, the water absorption rate in this stage is more stable.

[0007] Penetrating natural stone sealants primarily alter the interaction between water and the inner walls of the stone's pores through chemical methods, decisively influencing each stage of capillary action, penetration, and diffusion. In particular, the sealant transforms the walls of the stone's micropores into hydrophobic ones, preventing liquid water from wetting them and significantly reducing the ability for continuous penetration within the pore network. However, current methods use the average water absorption rate over 2 hours (i.e., the linear relationship between water absorption and the square root of time) as the evaluation criterion, mainly focusing on the capillary stage. This lacks a quantitative assessment of the overall water absorption patterns at each stage (especially the penetration and diffusion stages), making it difficult to comprehensively and accurately evaluate the protective effect.

[0008] Therefore, for penetrating natural stone protective agents, a more scientific and reasonable on-site method for measuring and evaluating the waterproofing enhancement effect based on a Gaston measuring bottle is proposed, which is of great significance for scientifically evaluating the performance of protective agents and guiding engineering practice. Summary of the Invention

[0009] This application provides a method for evaluating the effectiveness of penetrating natural stone protective agents based on a Caston measuring bottle. This method can more scientifically, comprehensively, and quickly measure and evaluate the waterproofing enhancement effect of penetrating stone protective agents on stone at the engineering site from the perspective of reducing the water permeability of stone.

[0010] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0011] According to a first aspect of the embodiments of this application, a method for measuring and evaluating the effectiveness of a penetrating natural stone protective agent based on a Caston volumetric flask is provided, comprising: S101. Obtain the target stone and select at least 3 detection points on the surface of the target stone; S102. For each test point, fix the edge of the Gaston volumetric bottle to the original stone surface and seal the contact point between it and the stone surface. S103, Set the total observation duration t e Water was added to the Gaston volumetric flask, and the water level drop was observed to determine the water absorption rate ω1 of the stone at each monitoring point in the first 2 hours and the water absorption rate ω2 for the remaining observation time; where 6h≤t e ≤8h; S104. Calculate the average water absorption rate ω3 and the average water absorption rate ω4 of all test points under the original stone condition in the first 2 hours; S105. Apply a penetrating natural stone protectant to the target stone surface; for each test point, fix the edge of the Gaston volumetric bottle to the stone surface coated with the protectant and seal the contact point between it and the stone surface; S106. Repeat the process of S103 to determine the water absorption rate ω5 of the stone at each test point in the first 2 hours and the water absorption rate ω6 for the remaining observation time, with the protective agent applied. S107. Calculate the average water absorption rate ω7 of the stone at all test points in the first 2 hours and the average water absorption rate ω8 for the remaining observation time, with the protective agent applied. S108. Compare the average water absorption rate values ​​ω3 and ω7. If ω3 ≤ ω7, it indicates that the penetrating natural stone protective agent has failed; otherwise, it indicates that it is effective. Calculate the quantitative index of the protective effect.

[0012] According to one embodiment of this application, the sealing material is paraffin wax, silicone rubber, or butyl rubber.

[0013] According to one embodiment of this application, S103 specifically includes: Observation duration t in settings e With different observation time intervals; Start timing after adding water to the Gaston flask and record the height the water level in the Gaston flask drops after each time interval. Based on the recorded data, calculate the water absorption rate value ω1 for the first 2 hours and the average water absorption rate value ω2 for the remaining observation time.

[0014] According to one embodiment of this application, the different observation time intervals include 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 45 min, 60 min, and 1 hour. e Observations are taken every 0.5 hours within the range.

[0015] According to one embodiment of this application, the method for calculating the water absorption rate value ω1 in the first 2 hours is as follows: For the time points within the first 2 hours, the water absorption per unit area at each time point is used as the vertical axis, and the square root of the corresponding elapsed time is used as the horizontal axis to draw a linear relationship graph between the two. The slope of the line is taken as the water absorption rate ω1 of the stone within 2 hours.

[0016] According to one embodiment of this application, the average water absorption rate value ω2 for the remaining observation time is calculated as follows:

[0017] in, t represents the amount of water level drop in the gasket at the i-th time interval, expressed in kg. m Each takes the value t e -2h、t e -1.5h, t e -1.0h, t e -0.5h, t e Five time intervals; A is the sealing area of ​​the gasket in contact with the stone, in m; ω2 is in kg / (m²·h).

[0018] According to one embodiment of this application, after adding water to a gasket, a drop of liquid paraffin is dropped onto the surface of the water for sealing.

[0019] According to one embodiment of this application, after water is added to the gasket, the top of the gasket is sealed.

[0020] According to one embodiment of this application, the formula for calculating the quantitative index of the protective effect is as follows:

[0021] in, The value serves as a quantitative indicator for evaluating the reduction rate of water permeability in penetrating natural stone protective agents. The higher the value, the better the protection.

[0022] According to one embodiment of this application, the Gaston volumetric flask is either vertical or horizontal.

[0023] Compared with existing technologies, the beneficial effects of adopting the above technical solution are as follows: (1) The method of the present invention is simple to operate, takes less time, and has a scientific and reliable evaluation. It can capture the influence of penetrating natural stone protective agent on the water absorption characteristics of stone at each stage of capillary, penetration and diffusion more comprehensively and meticulously, so as to more realistically reflect and evaluate the waterproof enhancement effect of the protective agent.

[0024] (2) This invention evaluates the waterproofing enhancement effect of the protective agent by combining two indicators: the change in average water absorption rate within 2 hours before and after stone protection (capillary stage) and the change in average water absorption rate from 2 hours to the total observation period. Compared with conventional test and evaluation methods that only consider the change in water absorption rate during the capillary stage, the quantitative evaluation results of this invention are more accurate, effectively improving the efficiency and scientific nature of on-site personnel's judgment of the waterproofing enhancement effect of the protective agent. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0026] Figure 1 This is a flowchart illustrating the method for evaluating the effectiveness of a penetrating natural stone protective agent based on a Caston volumetric flask, as described in this application.

[0027] Figure 2 For the original sesame white granite stone in this application embodiment, the t within 2 hours i 0.5 ~V ti / A linear relationship graph.

[0028] Figure 3 For the sesame white granite stone protected according to the embodiments of this application, the t within 2 hours i 0.5 ~V ti / A linear relationship graph. Detailed Implementation

[0029] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0030] To address the shortcomings of existing technologies, this application proposes a method for evaluating the effectiveness of penetrating natural stone protective agents based on a Caston measuring bottle. A 6-8 hour Caston measuring bottle water absorption test is conducted on the stone surface before and after protection, measuring and recording the water absorption at different time intervals. First, the linear slope of the water absorption within 2 hours (capillary stage) before and after protection is calculated using fitting, and the magnitude of the two values ​​is compared to qualitatively determine whether the waterproofing enhancement effect of the protective agent has failed. Then, the average water absorption rate of the stone within 2 hours to the total observation period before and after protection (the more stable penetration and diffusion stage) is calculated, and the ratio of the difference between the two values ​​is compared to quantitatively determine the rate of reduction in stone permeability after the application of the protective agent, thereby evaluating the waterproofing enhancement effect of the protective agent.

[0031] Please refer to Figure 1 The specific steps of this measurement and evaluation method are as follows: S101. Obtain the target stone and select at least 3 detection points on the surface of the target stone.

[0032] In practical applications, a representative testing area is selected on the original surface of the target stone that needs protection on-site, and then three testing points are taken from the testing area. In this embodiment, only three testing points are used as an example. In practical applications, more testing points can be added as needed.

[0033] It should be noted that in the subsequent testing and evaluation process, tests were conducted on the three selected test points, both before and after the application of the protective agent.

[0034] S102. For each test point, fix the edge of the Gaston volumetric bottle to the original stone surface and seal the contact point between it and the stone surface.

[0035] In this embodiment, two types of tests are conducted on the target stone: one before the protective agent is applied and the other after the protective agent is applied.

[0036] For the raw stone, at each testing point, the edge of the Gaston volumetric bottle is fixed to the surface of the raw stone, and the contact point between the bottle and the stone surface is sealed. Preferably, sealing materials such as paraffin wax, silicone rubber, or butyl rubber can be used to ensure no leakage. The Gaston volumetric bottle used can be vertical or horizontal.

[0037] S103, Set the total observation duration t e Water was added to the Gaston volumetric flask, and the water level was observed to determine the water absorption rate ω1 of the stone at each testing point in the first 2 hours and the water absorption rate ω2 for the remaining observation time.

[0038] After securing the Caston volumetric flask, the test can be performed. First, add water to the flask, filling it to the 0 mark for easier calculation and observation. Then, place a drop of liquid paraffin on the water surface or seal the top of the flask with plastic wrap to prevent moisture evaporation.

[0039] Observations can then begin. In this embodiment, a total observation duration t is preset. e and different observation time intervals t i , where 6h≤t e ≤8h. Record the height (i.e., the amount of water absorbed) V of the water level drop in the volumetric flask after different time intervals at each observation time point. ti This process continues until the total observation time is reached. Finally, the water absorption rate of the stone can be determined based on the relationship between the water level drop and time.

[0040] In this embodiment, the observation time intervals are set to 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 45 min, 60 min, and 1 hour. e Observations are taken every 0.5 hours within the range.

[0041] In calculating the water absorption rate, this embodiment divides the total observation time into a capillary stage (first 2 hours) and a permeation-diffusion stage (2 hours to t). e ).

[0042] The methods for determining the water absorption rate at the capillary stage include: For the time points within the first 2 hours, the water absorption per unit area at each time point is used as the vertical axis, and the square root of the corresponding elapsed time is used as the horizontal axis to draw a linear relationship graph between the two. The slope of the line is taken as the water absorption rate ω1 of the stone within 2 hours.

[0043] The methods for determining the water absorption rate ω2 during the osmosis-diffusion phase (remaining observation time) include:

[0044] in, t represents the amount of water level drop in the gasket at the i-th time interval, expressed in kg. m Each takes the value t e -2h、t e -1.5h, t e -1.0h, t e -0.5h, t e Five time intervals; A is the sealing area of ​​the gasket in contact with the stone, in m; ω2 is in kg / (m²·h).

[0045] The corresponding water absorption rate value was obtained for each testing point using the above calculation method.

[0046] S104. Calculate the average water absorption rate ω3 of all test points under the original stone condition in the first 2 hours and the average water absorption rate ω4 in the remaining observation time.

[0047] After determining the average water absorption rate of each testing point in the first 2 hours and the remaining observation time, the mean can be calculated, and then the average water absorption rate ω3 of the stone in the first 2 hours and the average water absorption rate ω4 of the remaining observation time can be determined under the original stone condition.

[0048] S105. Apply a penetrating natural stone protectant to the target stone surface; for each test point, fix the edge of the gasket to the stone surface coated with the protectant and seal the contact point between it and the stone surface.

[0049] Next, a second type of test needs to be conducted, which involves applying a penetrating natural stone sealant to the target stone surface and then testing. The test points remain the same as those selected in S101. After applying the penetrating natural stone sealant to the stone surface, the edge of the Gaston volumetric bottle is fixed to the sealant-coated stone surface, and the contact point between the bottle and the stone surface is sealed. Sealing materials include paraffin wax, silicone rubber, and butyl rubber.

[0050] S106. Repeat the process of S103 to determine the water absorption rate ω5 of the stone at each test point in the first 2 hours and the water absorption rate ω6 for the remaining observation time, with the protective agent applied.

[0051] In this embodiment, the water addition and observation process under the condition of applying the protective agent is the same as in S103, and will not be described again here. At this time, the water absorption rate value ω5 of the stone at each detection point in the first 2 hours and the water absorption rate value ω6 of the remaining observation time can be determined under the condition of applying the protective agent.

[0052] S107. Calculate the average water absorption rate ω7 of the stone at all test points in the first 2 hours and the average water absorption rate ω8 for the remaining observation time, with the protective agent applied.

[0053] In this embodiment, by calculating the average water absorption rate of each test point under the condition of coating the protective agent, the average water absorption rate ω7 of the stone in the first 2 hours and the average water absorption rate ω8 of the remaining observation time under the condition of coating the protective agent are obtained.

[0054] S108. Compare the average water absorption rate values ​​ω3 and ω7. If ω3 ≤ ω7, it indicates that the penetrating natural stone protective agent has failed; otherwise, it indicates that it is effective. Calculate the quantitative index of the protective effect.

[0055] Finally, the effectiveness of the waterproofing agent is qualitatively determined by comparing the average water absorption rate before and after application during the capillary stage (within the first 2 hours). Specifically, the average water absorption rate ω3 and ω7 are compared. If ω3 ≤ ω7, the penetrating natural stone protective agent has failed; otherwise, it is effective.

[0056] Based on the assessment of the effectiveness of the protective agent, the protective effect can be further quantified. The formula for calculating the quantitative indicators of protective effect is as follows:

[0057] in, The value serves as a quantitative indicator for evaluating the reduction rate of water permeability in penetrating natural stone protective agents. The higher the value, the better the protection.

[0058] This completes the evaluation of the waterproofing and enhancing effect of the penetrating natural stone protective agent.

[0059] To verify the feasibility of the measurement and evaluation method proposed in this embodiment, we took an outdoor sesame white granite paved surface as the base surface and used Brand A penetrating natural stone protective agent (hereinafter referred to as protective agent A) for surface protection as an example to verify and evaluate its waterproof enhancement effect on the stone after protection.

[0060] First, the operation is carried out according to the aforementioned S101~S108, with a total observation time t. e The time was 8 hours, and the water absorption test results were obtained within 2 hours before and after the stone protection test. i 0.5 ~V ti / A Trend Linear Relationship Chart ( Figure 2 and Figure 3 As shown in Table 1 and Table 2, the water absorption per unit area at all time intervals within 2 to 8 hours before and after the water absorption test of the stone protection is performed.

[0061] Table 1. Water absorption per unit area of ​​raw sesame white granite at all time intervals from 2 to 8 hours.

[0062] Table 2. Water absorption per unit area of ​​Sesame White Granite at all time intervals from 2 to 8 hours after protection.

[0063] Table 3. Average water absorption rate and evaluation of protective effect before and after stone protection at different stages.

[0064] The average water absorption rates ω3 and ω7 before and after stone protection within 2 hours and ω4 and ω8 before and after stone protection within 2 hours to 8 hours were obtained from the test. The waterproofing enhancement effect was quantitatively evaluated (△ω). At the same time, for comparison, the water permeability reduction rate before and after stone protection treatment, which only considers the capillary action stage, was also calculated (△ω'). The results are shown in Table 3.

[0065] According to the data in Table 3, after the application of protective agent A in this embodiment, the water permeability reduction rate Δω of the sesame white granite was 84%. This indicates that protective agent A in this embodiment has a significant waterproofing enhancement effect on the sesame white granite.

[0066] The inventors further measured the water resistance (equivalent to the reduction in permeability) of the protective agent A in the laboratory according to the relevant methods specified in GB / T 32837-2016, and found it to be 86%. A comparison shows that the reduction in permeability of the stone before and after protection, measured by the indoor water resistance test method, is basically the same as the reduction in permeability measured by the method of this invention. However, the reduction in permeability measured only considering the capillary action stage differs significantly from the above. This indicates that the method proposed in this invention yields relatively accurate results and can accurately and conveniently measure and evaluate the water resistance enhancement effect of penetrating natural stone protective agents on stone in the field.

[0067] This invention conducts a 6-8 hour Gaston volumetric bottle water absorption test on the stone surface before and after protection, measuring and recording the water absorption at different time intervals. First, the linear slope of the water absorption within 2 hours (capillary stage) before and after protection is calculated using fitting, and the magnitude of these two values ​​is compared to qualitatively determine whether the waterproofing enhancement effect of the protective agent has failed. Then, the average water absorption rate of the stone within 2 hours to the total observation time (the more stable penetration and diffusion stage) before and after protection is calculated, and the ratio of the difference between the two values ​​is compared to quantitatively determine the rate of reduction in the stone's permeability after the application of the protective agent. The former is qualitative, and the latter is quantitative; the two indicators are used together to evaluate the waterproofing enhancement effect of the protective agent. The overall evaluation results are more accurate, effectively improving the efficiency and scientific nature of on-site personnel's assessment of the waterproofing enhancement effect of the protective agent.

[0068] For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to the specific circumstances; the accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of this invention. Obviously, the described embodiments are some embodiments of this invention, but not all embodiments. Generally, the components of the embodiments of this invention described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0069] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for evaluating the effectiveness of a penetrating natural stone protective agent based on a Caston volumetric flask, characterized in that, include: S101. Obtain the target stone and select at least 3 detection points on the surface of the target stone; S102. For each test point, fix the edge of the Gaston volumetric bottle to the original stone surface and seal the contact point between it and the stone surface. S103, Set the total observation duration t e Water was added to the Gaston volumetric flask, and the water level drop was observed to determine the water absorption rate ω1 of the stone at each monitoring point in the first 2 hours and the water absorption rate ω2 for the remaining observation time; where 6h≤t e ≤8h; S104. Calculate the average water absorption rate ω3 and the average water absorption rate ω4 of all test points under the original stone condition in the first 2 hours; S105. Apply a penetrating natural stone protectant to the target stone surface; for each test point, fix the edge of the Gaston volumetric bottle to the stone surface coated with the protectant and seal the contact point between it and the stone surface; S106. Repeat the process of S103 to determine the water absorption rate ω5 of the stone at each test point in the first 2 hours and the water absorption rate ω6 for the remaining observation time, with the protective agent applied. S107. Calculate the average water absorption rate ω7 of the stone at all test points in the first 2 hours and the average water absorption rate ω8 for the remaining observation time, with the protective agent applied. S108. Compare the average water absorption rate values ​​ω3 and ω7. If ω3 ≤ ω7, it indicates that the penetrating natural stone protective agent has failed; otherwise, it indicates that it is effective. Calculate the quantitative index of the protective effect.

2. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Gaston volumetric flasks according to claim 1, characterized in that, The sealing material is paraffin wax, silicone rubber, or butyl rubber.

3. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Caston volumetric flasks according to claim 1, characterized in that, S103 specifically includes: Observation duration t in settings e With different observation time intervals; Start timing after adding water to the Gaston flask and record the height the water level in the Gaston flask drops after each time interval. Based on the recorded data, calculate the water absorption rate value ω1 for the first 2 hours and the average water absorption rate value ω2 for the remaining observation time.

4. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Caston volumetric flasks according to claim 3, characterized in that, The different observation time intervals include 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 45 min, 60 min, and 1 hour. e Observations are taken every 0.5 hours within the range.

5. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Gaston volumetric flasks according to claim 4, characterized in that, The method for calculating the water absorption rate ω1 in the first 2 hours is as follows: For the time points within the first 2 hours, the water absorption per unit area at each time point is used as the vertical axis, and the square root of the corresponding elapsed time is used as the horizontal axis to draw a linear relationship graph between the two. The slope of the line is taken as the water absorption rate ω1 of the stone within 2 hours.

6. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Caston volumetric flasks according to claim 4, characterized in that, The method for calculating the average water absorption rate ω2 during the remaining observation time is as follows: in, t represents the amount of water level drop in the gasket at the i-th time interval, expressed in kg. m Each takes the value t e -2h、t e -1.5h, t e -1.0h, t e -0.5h, t e Five time intervals; A is the sealing area of ​​the gasket in contact with the stone, in m; ω2 is in kg / (m²·h).

7. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Caston volumetric flasks according to claim 1, characterized in that, After adding water to the gasket, seal it by dropping a drop of liquid paraffin onto the surface of the water.

8. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Gaston volumetric flasks according to claim 1, characterized in that, After adding water to the Gaston flask, seal the top of the flask.

9. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Gaston volumetric flasks according to claim 1, characterized in that, The formula for calculating the quantitative index of the protective effect is as follows: in, The value serves as a quantitative indicator for evaluating the reduction rate of water permeability in penetrating natural stone protective agents. The higher the value, the better the protection.

10. The method for determining and evaluating the effect of penetrating natural stone protective agents based on Gaston volumetric flasks according to claim 1, characterized in that, The gasket can be vertical or horizontal.

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