Method for measuring penetration depth of permeable liquid hardening agent

Abstract

The invention relates to the technical field of penetration depth measurement, in particular to a method for measuring the penetration depth of a penetration type liquid hardening agent. The method for measuring the penetration depth of the penetration type liquid hardener comprises the following steps: manufacturing a concrete test piece; brushing a permeable liquid hardener and acid red 92 on the surface of the test piece, and standing for a period of time; and splitting the test piece from the middle, irradiating the profile with green light, and measuring the width of a fluorescent region, which is the penetration depth of the penetration type liquid hardening agent. The acid red 92 is compatible with a permeable liquid hardener, does not react or precipitate with the hardener, emits obvious fluorescence after being excited, and is difficult to quench by concrete components. The acid red 92 is good in water solubility, can synchronously permeate the concrete test piece with the permeable liquid hardening agent, and can accurately reflect the permeation depth of the permeable liquid hardening agent. And splitting the concrete test piece, and irradiating the profile with green light to measure the penetration depth.

Description

Technical Field

[0001] The present application relates to the technical field of penetration depth measurement, and in particular to a method for measuring the penetration depth of a penetrating liquid hardener. Background Art

[0002] A penetrating liquid hardener is an aqueous solution composed of silicates, wetting agents, and other additives. Penetrating liquid hardeners possess strong penetrating properties. The silicates react with the free calcium oxide in concrete through a complex chemical reaction, forming calcium silicate hydrate (CSH). This hydrate fills pores and increases hardness, creating a three-dimensional network structure. This makes the concrete structure denser and stronger, effectively sealing the pores and permanently preventing the release of concrete dust from surface voids. The result is a dust-free, dense, high-strength, highly wear-resistant concrete floor with a marble-like luster. This significantly improves the concrete's performance in terms of impermeability, wear resistance, freeze-thaw cycles, hardness, and other performance indicators. The glossiness improves with use.

[0003] The current method for measuring the penetration depth of penetrating liquid hardeners involves first preparing a concrete specimen, then applying the penetrating liquid hardener to the recommended dosage specified in the hardener's product manual. After allowing the specimen to sit for a period of time, the specimen is split in half and a color developer is applied to the cross-section to develop color. The color difference is used to identify areas of penetration and non-penetration, thereby measuring the penetration depth. This method, which requires applying a color developer to the cross-section, is relatively cumbersome. Summary of the Invention

[0004] In view of the problem that the current method of measuring the penetration depth of penetrating liquid hardeners requires smearing the cross section with a color developer, which is rather troublesome, this application proposes a solution for measuring the penetration depth of penetrating liquid hardeners that does not require smearing the cross section with a reagent, as follows.

[0005] A method for measuring the penetration depth of a penetrating liquid hardener, the method comprising: S1, prepare concrete specimens.

[0006] S2: Apply penetrating liquid hardener and Acid Red 92 to the surface of the specimen and let it stand for a while.

[0007] S3, cutting the specimen in half, illuminating the cross section with green light, and measuring the width of the fluorescent area, which is the penetration depth of the penetrating liquid hardener.

[0008] By adopting the above technical solution, Acid Red 92 is compatible with penetrating liquid hardeners, does not react or precipitate with the hardener, emits distinct fluorescence upon excitation, and is not easily quenched by concrete components. Acid Red 92 is highly water-soluble and can simultaneously penetrate concrete specimens with the penetrating liquid hardener, accurately reflecting the penetration depth of the penetrating liquid hardener. To determine the penetration depth of the penetrating liquid hardener, simply split the concrete specimen and illuminate the cross-section with green light for measurement, eliminating the need to smear the cross-section with a reagent to measure the penetration depth, saving time and effort. It should be noted that the chemical composition of Acid Red 92 is sodium tetrabromotetrachlorofluorescein.

[0009] A preferred solution of the method for measuring the penetration depth of the penetrating liquid hardener is that, in step S2, the amount of Acid Red 92 added is 0.05% to 0.2% of the mass of the penetrating liquid hardener.

[0010] By adopting the above technical solution, Acid Red 92 and the penetrating liquid hardener are simultaneously infiltrated into the concrete.

[0011] A preferred solution of the method for measuring the penetration depth of the penetrating liquid hardener is that, in step S2 , the amount of Acid Red 92 added is 0.1% of the mass of the penetrating liquid hardener.

[0012] By adopting the above technical solution, Acid Red 92 is fully dispersed in the penetrating liquid hardener and emits obvious fluorescence after being excited.

[0013] A preferred embodiment of the method for measuring the penetration depth of the penetrating liquid hardener is that step S1 specifically includes: using ordinary Portland cement with a strength grade of 42.5 in accordance with GB175 and ISO standard sand in accordance with GB / T17671, with a cement-to-sand mass ratio of 1:3, and adding water in an amount such that the cone of a mortar consistency meter sinks into the mortar to a depth of 100-105 mm; pouring the mixed cement mortar into a forming frame, allowing it to dry on the surface and then standing for 24 hours, then demolding and curing for 28 days; selecting a concrete block with a surface flatness of 0-1.0 mm as a test substrate for standby use; and polishing the surface of the test substrate before testing to remove loose dust, polishing the exposed sand grains to a smooth surface, and allowing it to stand for 24 hours after polishing.

[0014] By adopting the above technical solution, the surface is smooth, the penetration depth at each location is relatively close, and the production of the test piece is standardized, and the measurement results are reproducible.

[0015] A preferred embodiment of the method for measuring the penetration depth of the penetrating liquid hardener is that the penetrating liquid hardener is a lithium-based penetrating liquid hardener, a sodium-based penetrating liquid hardener, a potassium-based penetrating liquid hardener, or a two-component penetrating liquid hardener.

[0016] By adopting the above technical solution, these hardeners contain silicates, which can undergo a complex chemical reaction with the free calcium oxide component in concrete to form calcium silicate hydrate (CSH). These hardeners can penetrate concrete simultaneously with Acid Red 92.

[0017] A preferred solution of the method for measuring the penetration depth of the penetrating liquid hardener is that, in step S3, the green light has a wavelength of 530-540 nm.

[0018] By adopting the above technical solution, the green light of this wavelength is the excitation peak of Acid Red 92, the luminescence is strong, the emission peak is 550-570nm, and the emitted fluorescence is yellow-green light.

[0019] A preferred embodiment of the method for measuring the penetration depth of the penetrating liquid hardener is to measure the width of the fluorescent area in step S3 by selecting at least five locations in the fluorescent area, the locations being equally spaced, and measuring the width from the outer edge of the specimen to the inner edge of the luminous area at each location. For each specimen, the maximum and minimum values of the measured widths are discarded, and the average of the remaining values is taken as the penetration depth result of the specimen.

[0020] By adopting this technical solution, the fluorescent agent penetrates from the outer edge of the specimen inward, leaving fluorescent agent at every location it passes through and emitting fluorescence, reflecting the area of hardener penetration. This test method provides more accurate measurement results. The outer edge of the specimen also serves as the outer edge of the luminous zone.

[0021] A preferred solution of the method for measuring the penetration depth of the penetrating liquid hardener is that the standing time in step S2 is 7 days.

[0022] By adopting the above technical solution, the fluorescent agent is relatively stable and can be stored in the test piece for 7 days without deterioration. It can also emit bright fluorescence after being stimulated.

[0023] In summary, the present invention's method for measuring the penetration depth of a penetrating liquid hardener offers the following advantages: Acid Red 92, a fluorescent agent with relatively long excitation and emission wavelengths, is selected. After prolonged exposure to concrete, it is not easily quenched by concrete components and produces distinct luminescence. Acid Red 92 does not react with or precipitate the hardener. This fluorescent agent simultaneously penetrates the concrete with the hardener, accurately reflecting the hardener's penetration depth. Measuring the penetration depth of the fluorescent agent provides an accurate measure of the hardener's penetration depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart for measuring the penetration depth of a penetrating liquid hardener according to Example 1. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments are described clearly and completely below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the following embodiments, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] Example 1 Measuring the penetration depth of penetrating liquid hardeners, refer to Figure 1 , the measurement steps are as follows.

[0027] (1) Preparation of concrete specimens (i.e. test substrates) Use ordinary Portland cement with a strength grade of 42.5 as specified in GB 175 and ISO standard sand as specified in GB / T 17671. The cement-sand ratio is 1:3 (mass ratio). The amount of water added is calculated based on a consistency of (100-105) mm. (100-105) mm refers to the depth (in mm) that the cone of the mortar consistency meter sinks into the mortar. During molding, place a 160 mm × 130 mm × 40 mm metal molding frame on a flat, level surface (such as ceramic tile). Apply a release agent to the inside and bottom of the molding frame. Pour the mixed cement mortar into the molding frame, with the mortar protruding 4-6 mm above the top of the frame. Once the surface moisture has dried slightly, scrape and smooth the excess mortar along the top of the mold. Let it rest for 24 hours before demolding. Curing under standard test conditions for up to 28 days. Use a straightedge and feeler gauge to test the substrate's surface flatness along the diagonal line. Three concrete blocks with a maximum gap of no more than 1.0 mm between the straightedge and the concrete surface are used as test substrates. Before testing, polish the test substrate surface with a water grinder using 50-, 100-, and 150-mesh grinding pads. Remove any loose dust and smooth any exposed sand. After polishing, condition the surface under standard test conditions for 24 hours.

[0028] (2) Sample preparation A sample was prepared by mixing a penetrating liquid hardener and Acid Red 92. The penetrating liquid hardener was a lithium-based penetrating liquid hardener supplied by Shanghai Hengchuang Chemical Co., Ltd. under the trade name Sikafloor-CureHard-24. The amount of Acid Red 92 added was 0.1% by weight of the penetrating liquid hardener.

[0029] (3) Apply the sample on the surface of the specimen Apply the sample evenly on the surface of the test substrate with a coating amount of 0.2g / cm 2 , let the painted specimens stand for 7 days.

[0030] (4) Excite fluorescence and measure penetration depth After the sample is painted and allowed to stand for 7 days, the concrete specimen is cut in half and illuminated with green light of wavelength 530-540nm. The width of the fluorescent area is measured. Specifically, 5 positions of the fluorescent area are taken and the positions are equally distributed. The maximum and minimum values of the measured width of each specimen are discarded, and the average of the remaining values is taken as the penetration depth result of the specimen, which is the penetration depth of the penetrating liquid hardener.

[0031] Example 2 This example uses the same method as Example 1 to measure the penetration depth of the penetrating liquid hardener, with the only difference being that the penetrating liquid hardener is a sodium-based penetrating liquid hardener supplied by Shanghai Weidun New Material Technology Co., Ltd., model number WD-N-01, and the amount of Acid Red 92 added is 0.2% of the mass of the penetrating liquid hardener.

[0032] Example 3 This example uses the same method as Example 1 to measure the penetration depth of the penetrating liquid hardener, with the only difference being that the penetrating liquid hardener is a potassium-based penetrating liquid hardener supplied by Zhejiang Yajie Building Materials Co., Ltd., model KS-503A, and the amount of Acid Red 92 added is 0.05% of the mass of the penetrating liquid hardener.

[0033] Example 4 This example uses the same protocol as Example 1 to measure the penetration depth of a penetrating liquid hardener. The only difference is that the penetrating liquid hardener is a two-component penetrating liquid hardener supplied by Quanzhou Park New Material Technology Co., Ltd., under the trade name FS-801 Composite Concrete Penetrating Liquid Hardener (Platinum Crystal No. 1). The hardener comprises component A and component B. Component A and component B are mixed in a 1:1 mass ratio to obtain the penetrating liquid hardener. Acid Red 92 is also added at a rate of 0.1% by mass of the penetrating liquid hardener.

[0034] Comparative Example 1 This comparative example adopts the conventional method of applying a developer on a cross section to develop color, thereby measuring the penetration depth of the penetrating liquid hardener.

[0035] This comparative example has the same step (1) as Example 1, and a concrete specimen (ie, test substrate) is prepared. Specifically, the measurement steps of this comparative example are as follows.

[0036] (1) Preparation of concrete specimens (i.e. test substrates) Use ordinary Portland cement with a strength grade of 42.5 as specified in GB 175 and ISO standard sand as specified in GB / T 17671. The cement-sand ratio is 1:3 (mass ratio). The amount of water added is calculated based on a consistency of (100-105) mm. (100-105) mm refers to the depth (in mm) that the cone of the mortar consistency meter sinks into the mortar. During molding, place a 160 mm × 130 mm × 40 mm metal molding frame on a flat, level surface (such as ceramic tile). Apply a release agent to the inside and bottom of the molding frame. Pour the mixed cement mortar into the molding frame, with the mortar protruding 4-6 mm above the top of the frame. Once the surface moisture has dried slightly, scrape and smooth the excess mortar along the top of the mold. Let it rest for 24 hours before demolding. Curing under standard test conditions for up to 28 days. Use a straightedge and feeler gauge to test the substrate's surface flatness along the diagonal line. Three concrete blocks with a maximum gap of no more than 1.0 mm between the straightedge and the concrete surface are used as test substrates. Before testing, polish the test substrate surface with a water grinder using 50-, 100-, and 150-mesh grinding pads. Remove any loose dust and smooth any exposed sand. After polishing, condition the surface under standard test conditions for 24 hours.

[0037] (2) Sample preparation and coating The sample of this comparative example is the same as that of Example 1, which is a lithium-based penetrating liquid hardener. The supplier of this hardener is Shanghai Hengchuang Chemical Co., Ltd., and the trade name is Sikafloor-CureHard-24. The sample is evenly applied on the surface of the test substrate at a coating amount of 0.2 g / cm 2 , let the painted specimens stand for 7 days.

[0038] (3) Excite fluorescence and measure penetration depth A concrete specimen was split in half and phenolphthalein reagent was applied to the cross section. Due to a complex chemical reaction between the silicate hardener and the alkaline calcium oxide component in the concrete, calcium silicate hydrate (CSH) was generated, which consumed the alkaline substances. As a result, the concrete penetrated by the hardener could not discolor the phenolphthalein, while the concrete not penetrated by the hardener contained alkaline substances that could discolor the phenolphthalein. Therefore, the areas penetrated by the hardener and those not penetrated by the hardener exhibited a significant color difference. A color change line separated the two areas. The width of the non-discoloring area was measured as the penetration depth of the hardener. Specifically, as in Example 1, five identical locations were selected. At each location, the width between the outer edge of the specimen and the color change line was measured. The maximum and minimum measured widths for each specimen were discarded, and the average of the remaining values was taken as the penetration depth of the specimen, which was the penetration depth of the penetrating liquid hardener.

[0039] Comparative Example 2 This comparative example adopts the same scheme as comparative example 1, with the only difference being that the penetrating liquid hardener in this comparative example is a sodium-based penetrating liquid hardener, the supplier of which is Shanghai Weidun New Material Technology Co., Ltd., and the model number is WD-N-01. The penetrating liquid hardener in this comparative example is the same as that in Example 2.

[0040] Comparative Example 3 This comparative example adopts the same scheme as comparative example 1, with the only difference being that the penetrating liquid hardener in this comparative example is a potassium-based penetrating liquid hardener, the supplier of which is Zhejiang Yajie Building Materials Co., Ltd., and the model number is KS-503A. The penetrating liquid hardener in this comparative example is the same as that in Example 3.

[0041] Comparative Example 4 This comparative example adopts the same scheme as comparative example 1, with the only difference being that the penetrating liquid hardener in this comparative example is a two-component penetrating liquid hardener, the supplier of which is Quanzhou Park New Material Technology Co., Ltd., and the trade name is FS-801 composite concrete penetrating liquid hardener (Platinum Crystal No. 1), which includes component A and component B. Component A and component B are mixed in a 1:1 mass ratio to obtain a penetrating liquid hardener. The penetrating liquid hardener in this comparative example is the same as that in Example 4.

[0042] Test Example 1 The width results measured in Examples 1-4 and Comparative Examples 1-4 are compared in Table 1 below.

[0043] Table 1 Summary of penetration depth measurement data In Table 1: Example 1 and Comparative Example 1, using different measurement methods for the same lithium-based penetrating liquid hardener, measured the same average penetration depth of the lithium-based penetrating liquid hardener; Example 2 and Comparative Example 2, using different measurement methods for the same lithium-based penetrating liquid hardener, measured the same average penetration depth of the lithium-based penetrating liquid hardener; Example 3 and Comparative Example 3, using different measurement methods for the same lithium-based penetrating liquid hardener, measured the same average penetration depth of the lithium-based penetrating liquid hardener; Example 4 and Comparative Example 4, using different measurement methods for the same lithium-based penetrating liquid hardener, measured the same average penetration depth of the lithium-based penetrating liquid hardener, with a difference of 4%, which is a small difference.

[0044] The above depth test results show that the results of measuring the penetration depth using the scheme of adding fluorescent labeling first in Examples 1-4 and the scheme of adding the color developer later in Comparative Examples 1-4 are almost the same, indicating that the method of measuring the penetration depth of the penetrating liquid hardener in concrete using Acid Red 92 labeled with the penetrating liquid hardener in Examples 1-4 is reliable and highly accurate.

[0045] Comparative Example 5 This comparative example uses the same protocol as Example 1 to measure the penetration depth of the penetrating liquid hardener, with the only difference being that Acid Red 92 is replaced with sodium fluorescein in this comparative example; the amount of sodium fluorescein added is 0.1% by mass of the penetrating liquid hardener; and sodium fluorescein is excited using 490-492 nm blue-green light, emitting 513-514 nm green light.

[0046] Comparative Example 6 This comparative example uses the same protocol as Example 1 to measure the penetration depth of the penetrating liquid hardener, with the only difference being that Acid Red 92 is replaced with Rhodamine 6G in this comparative example; the amount of Rhodamine 6G added is 0.1% by mass of the penetrating liquid hardener; and Rhodamine 6G is excited using 525-530 nm green light, emitting 550-557 nm yellow-orange light.

[0047] Test Example 2 The width results measured in Example 1, Comparative Example 1, Comparative Example 5 and Comparative Example 6 are compared in Table 2 below.

[0048] Table 2 Summary of penetration depth measurement data Table 2 shows that for the same penetrating liquid hardener, Example 1 and Comparative Example 1 produced identical results using different measurement methods, while Comparative Examples 5 and 6 produced different data from Comparative Example 1. The method used in Comparative Example 1 is a currently used testing method and is therefore of comparative significance. This indicates that the sodium fluorescein used in Comparative Example 5 penetrated the concrete too quickly, significantly faster than the penetrating liquid hardener, and was unable to penetrate the concrete simultaneously with the penetrating liquid hardener. The rhodamine 6G used in Comparative Example 6 also penetrated the concrete too slowly, significantly slower than the penetrating liquid hardener, and was unable to penetrate the concrete simultaneously with the penetrating liquid hardener.

[0049] Based on the above embodiments, comparative examples, and test examples, it can be concluded that the solution of the present application, using Acid Red 92 as a tracer for the penetrating liquid hardener, allows Acid Red 92 to simultaneously penetrate concrete with the penetrating liquid hardener. Acid Red 92 exhibits excellent stability and can remain stable in the concrete for extended periods. Upon excitation, it emits strong fluorescence, resulting in accurate test results. Compared to the currently used method of applying a color developer to a cross-section, the solution of the present application is more time-saving and labor-saving.

[0050] Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for measuring the penetration depth of a penetrating liquid hardener, characterized in that: The measuring method comprises: S1, making concrete specimens; S2, apply penetrating liquid hardener and Acid Red 92 on the surface of the specimen and let it stand for a while; S3, cutting the specimen in half, illuminating the cross section with green light, and measuring the width of the fluorescent area, which is the penetration depth of the penetrating liquid hardener.

2. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: In step S2, the amount of Acid Red 92 added is 0.05% to 0.2% of the mass of the penetrating liquid hardener.

3. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 2, wherein: In step S2, the amount of Acid Red 92 added is 0.1% of the mass of the penetrating liquid hardener.

4. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: Step S1 specifically includes: using ordinary Portland cement with a strength grade of 42.5 in accordance with GB175 and ISO standard sand in accordance with GB / T17671, with a mass ratio of cement to sand of 1:3, and adding water so that the cone of the mortar consistency meter sinks into the mortar to a depth of 100 to 105 mm; pouring the mixed cement mortar into a forming frame, letting it dry on the surface and then standing for 24 hours, then demolding and curing for 28 days; selecting a concrete block with a surface flatness of 0 to 1.0 mm as a test substrate for standby; before the test, polishing the surface of the test substrate to remove floating dust, polishing the exposed sand grains to make it smooth, and leaving it for 24 hours after polishing.

5. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: The penetrating liquid hardener is a lithium-based penetrating liquid hardener, a sodium-based penetrating liquid hardener, a potassium-based penetrating liquid hardener, or a two-component penetrating liquid hardener.

6. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: In step S3, the green light has a wavelength of 530-540 nm.

7. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: The width of the fluorescent area is measured in step S3. Specifically, at least five positions of the fluorescent area are taken, and the positions are equidistantly distributed. The width from the outer edge of the specimen to the inner edge of the luminous area is measured at each position. The maximum and minimum values of the measured width of each specimen are discarded, and the average value of the remaining values is taken as the penetration depth result of the specimen.

8. The method for measuring the penetration depth of a penetrating liquid hardener according to claim 1, wherein: The standing time in step S2 is 7 days.

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