A method for judging the effectiveness of water seepage in concrete anti-seepage testing

Abstract

The present invention relates to the technical field of building material testing, and in particular to a method for judging the effectiveness of water seepage for concrete anti-seepage testing. The present invention proposes a method for judging the effectiveness of water seepage for concrete anti-seepage testing, and for the first time proposes to use the filtering characteristics of concrete specimens on macromolecular structures in the anti-seepage testing of concrete specimens, and by adding an anti-seepage reagent to water and then testing the seepage water body, it can be judged whether the seepage path passes through the concrete specimen, thereby effectively avoiding the misjudgment of concrete specimen water seepage caused by the sealing defects of the anti-seepage instrument sealing assembly.

Description

Technical Field

[0001] The invention relates to the technical field of building material detection, in particular to a method for judging water seepage effectiveness for concrete anti-seepage detection. Background Art

[0002] As a common building material in the civil engineering industry, concrete plays a decisive role in ensuring the safety of building structures and the subsequent delivery and use period. GB / T 50082 Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete makes basic technical requirements for the long-term performance and durability test of ordinary concrete, stipulating that: after the test piece is installed, the valves under the 6 test positions should be opened immediately to keep the water pressure constant at (1.2 ± 0.05) MPa within 24 hours, and the pressurization process should not exceed 5 minutes, and the time to reach a stable pressure should be used as the test record start time (accurate to 1 minute). During the pressure stabilization process, observe the water seepage of the end face of the test piece at any time. When water seepage occurs on the end face of a certain test piece, the test of the test piece should be stopped and the time should be recorded, and the height of the test piece should be used as the water seepage height of the test piece. If there is no water seepage on the end face of the test piece, the test should be stopped after 24 hours of the test, and the test piece should be removed in time. During the test, if water is found to be seeping from the periphery of the test piece, it should be sealed again in accordance with the provisions of Article 6.1.3 of this standard.

[0003] At present, both the semi-automatic control impermeability tester and the fully automatic control impermeability tester adopt the specimen sealing method shown in Figure 1(a), Figure 1(b), Figure 1(c), and Figure 1(d). The colored parts in Figure 1(a) and Figure 1(d) represent the concrete specimen 5. The sealing assembly of the impermeability tester includes: a base 1, a casing 4, an airbag 2, and a top seat 3; the airbag 2 is arranged on the inner periphery of the casing 4; during the test, the concrete specimen is placed in the center of the sealing assembly of the impermeability tester, and the base 1 is below the concrete specimen. The base 1 has the functions of constraining the specimen, the airbag 2, and providing the water inlet channel 10 to access high-pressure water; the top of the specimen is the top seat 3, which has the functions of constraining the specimen and the airbag 2, and providing the flushing port 30 to access the flushing water pressure, and also has the function of detecting the water seepage of the specimen. The concrete specimen is wrapped by the airbag 2, which consists of an annular sac body and an air nozzle. When the airbag 2 is filled with a specified air pressure through the air nozzle 20, the inner ring side of the airbag 2 hugs the concrete specimen, the outer ring side of the airbag 2 is constrained by the casing 4, the bottom of the airbag 2 is constrained by the base 1, and the top of the airbag 2 is constrained by the top seat 3.

[0004] The main problem with this test structure is that when water seepage is detected at the top of the test piece, it is usually considered that the test piece is penetrated by water, that is, the default water seepage path is path A shown in Figure 1(a), which can effectively determine that the test piece is penetrated; however, when there is a problem with the sealing of the airbag 2 in the existing test structure, water in the base 1 may also pass through the channel between the airbag 2 and the test piece, or pass through the airbag 2, and the water seepage path is path B shown in Figure 1(a), which cannot determine that the test piece is penetrated. Therefore, when water seepage is detected at the top of the test piece, it is actually impossible to accurately determine whether the test piece is effectively penetrated by water. Summary of the invention

[0005] In order to overcome the defect in the above-mentioned prior art that it is impossible to accurately determine whether the specimen is effectively penetrated by water, the present invention proposes a method for judging the effectiveness of water seepage for concrete anti-seepage testing, which solves the long-ignored problem of the effectiveness of anti-seepage instruments in automatically determining whether concrete specimens are effectively penetrated by water, and improves the detection effect and credibility of the fully automatic concrete anti-seepage instrument.

[0006] The present invention proposes a method for judging the effectiveness of water seepage for concrete anti-seepage testing. In the anti-seepage test, water added with an anti-seepage agent is used. After water seepage occurs, whether the seepage water contains the anti-seepage agent is detected; if not, the water seepage test result is judged to be valid; if yes, the water seepage test result is judged to be invalid; the molecular weight of the anti-seepage agent is greater than the maximum molecular weight that the concrete specimen can pass.

[0007] Preferably, the method comprises the following steps:

[0008] S1. Construct a sealed testing environment, block the concrete specimen in the channel, continuously add water to one side of the concrete specimen to increase the pressure, add anti-seepage reagent to the water, and detect the seepage water on the other side of the concrete specimen;

[0009] S2. If no seepage water is detected when the test is completed, the concrete specimen is judged to be qualified; if seepage water is detected when the test is completed, step S3 is executed;

[0010] S3. Detect whether there is anti-seepage reagent in the seepage water body; if yes, judge that this test is invalid; if no, judge that the concrete specimen is seeping.

[0011] Preferably, the method for selecting the anti-seepage agent is: firstly, a concrete permeable plate with a thickness of 10 mm to 20 mm is prepared, the maximum molecular weight that can pass through the concrete permeable plate is tested as a dividing value, and a reagent with a molecular weight greater than the dividing value is selected as the anti-seepage agent.

[0012] Preferably, the method for testing the maximum molecular weight that can pass through the concrete permeable plate is: placing the concrete permeable plate in a container, dividing the container into two unconnected sides, injecting liquid water on both sides, and then adding a plurality of reagents with gradient molecular weight changes on one side, after standing for 1 day to 30 days, detecting the reagent components on the other side, and obtaining the molecular weight of the reagent with the largest detected molecular weight as the demarcation value.

[0013] Preferably, the method for detecting whether the seepage water body contains the anti-seepage agent is: obtaining the influencing properties of the anti-seepage agent on the water body, detecting whether the seepage water body retains the influencing properties, and if so, judging that the seepage is invalid; the influencing properties include: at least one of turbidity, color and conductivity.

[0014] Preferably, when the property of the anti-seepage agent affecting the water body is color, light is irradiated into the seepage water body, and a photosensitive element is used to determine whether diffuse reflection of the corresponding color light exists in the seepage water body. If yes, the water seepage detection is determined to be invalid; if no, the water seepage detection is determined to be valid;

[0015] When the property of the water body affected by the anti-seepage reagent is turbidity, light is irradiated into the seepage water body, and the light intensity in the seepage water body is detected by using a photosensitive element; when the light intensity reaches the set threshold, it is judged that the seepage detection is effective; otherwise, it is invalid;

[0016] When the property affected by the anti-seepage agent on the water body is conductivity, positive and negative electrodes are set in the seepage water body to test the conductivity of the seepage water body and determine whether the anti-seepage agent exists in the seepage water body.

[0017] Preferably, the method for detecting whether the seepage water body contains the anti-seepage agent is: collecting a water sample of the seepage water body, and using a molecular detection method to detect whether the anti-seepage agent component exists in the water sample.

[0018] The advantages of the present invention are:

[0019] (1) The present invention proposes a method for judging the effectiveness of water seepage in concrete impermeability testing. It is the first time that the filtering characteristics of concrete specimens on macromolecular structures are used in the impermeability testing of concrete specimens. By adding an impermeability reagent to water and then testing the seepage water body, it is possible to judge whether the seepage path passes through the concrete specimen, thereby effectively avoiding the misjudgment of concrete specimen water seepage caused by the sealing defects of the impermeability tester sealing assembly.

[0020] (2) The present invention starts the anti-seepage reagent test after the seepage water body is detected, that is, the seepage effectiveness is further tested after the seepage water body is detected, which ensures the reliability of the concrete test anti-seepage test results and avoids the efficiency loss and cost loss of starting the seepage effectiveness test when there is no seepage.

[0021] (3) In the present invention, the molecular weight test of the concrete permeable plate is first performed, so that the molecular weight of the anti-seepage reagent can be accurately selected to avoid misjudgment of the seepage path caused by too small molecular weight passing through the concrete specimen with the water body.

[0022] (4) The present invention proposes to detect the anti-seepage reagent in the seepage water body according to the effect of the anti-seepage reagent on the water body. The idea is flexible and can convert the detection of the anti-seepage reagent into the detection of the light diffuse reflection, light transmittance, conductivity and other properties in the water body, thereby facilitating the setting of the sensor structure required for the detection at the bottom of the top seat, and facilitating the integrated detection of the anti-seepage instrument.

[0023] (5) In the present invention, a water delivery module can also be provided on the sealing assembly of the impermeability tester, and the water delivery module automatically collects the seepage water sample on the end surface of the concrete specimen close to the top seat and automatically delivers the water sample to the external detection device for impermeability reagent detection. In this way, the selection range of external detection devices is wider, the impermeability reagent detection means are more abundant, and the detection results are more accurate, which is conducive to more flexible selection of impermeability reagents to adapt to concrete specimens of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1(a) is a cross-sectional view of the sealing assembly of the current mainstream fully automatic concrete impermeability tester;

[0025] Figure 1(b) is an external view of the sealing assembly structure of the current mainstream fully automatic concrete impermeability tester;

[0026] Figure 1(c) is an open diagram of the sealing assembly structure of the current mainstream fully automatic concrete impermeability tester;

[0027] FIG1(d) is a cross-sectional view of the state of FIG1(c);

[0028] Illustration: 1-base; 10-water inlet channel; 2-air bag; 20-air nozzle; 3-top seat; 30-flushing port; 4-casing; 5-concrete specimen;

[0029] Figure 2 It is a flow chart of a method for judging the effectiveness of water seepage for concrete anti-seepage testing;

[0030] Figure 3 The present invention is a flow chart of a method for judging the effectiveness of water seepage in concrete waterproofing testing using a waterproofing instrument sealing assembly. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 2 As shown, the present embodiment proposes a method for judging the effectiveness of water seepage for concrete anti-seepage detection, in which water with anti-seepage reagent added is flushed into the anti-seepage detection, and after water seepage occurs, whether the anti-seepage reagent is contained in the seepage water body is detected;

[0033] If no, the water seepage test result is judged to be valid, indicating that the high-pressure water does pass through the concrete specimen and the concrete filters the anti-seepage reagent in the water body;

[0034] If yes, the water seepage test result is invalid and the anti-seepage reagent is not filtered, indicating that the water seepage has not passed through the concrete specimen. At this time, there may be a gap between the detection device and the concrete specimen, or the airbag 2 of the detection device is damaged.

[0035] like Figure 3 As shown, when the water seepage effectiveness judgment method for concrete water seepage detection is implemented using the water seepage meter sealing assembly shown in FIG. 1( a), the following steps are included:

[0036] S1. Install the concrete into the sealing assembly of the impermeability tester, close the sealing assembly of the impermeability tester and inflate the airbag 2 to construct a sealed testing environment; add water with high pressure to the base 1, add an impermeability reagent to the water, and detect whether there is water seepage on the end face of the concrete specimen on one side of the top seat 3;

[0037] S2. If no seepage water is detected when the test is completed, the concrete specimen is judged to be qualified; if seepage water is detected when the test is completed, step S3 is executed;

[0038] S3. Detect whether there is anti-seepage reagent in the seepage water body; if yes, judge that this test is invalid; if no, judge that the concrete specimen is seeping.

[0039] It is worth noting that the anti-seepage reagent should be selected with a molecular structure that can be filtered out by qualified concrete specimens to avoid the small molecular structure that cannot be effectively filtered out by the concrete specimen, thereby causing the misjudgment of invalid water seepage.

[0040] The method for selecting anti-seepage reagents is as follows: first, make a concrete permeable plate with a thickness of 10mm-20mm, test the maximum molecular weight that can pass through the concrete permeable plate as the cutoff value, and select the reagent with a molecular weight greater than the cutoff value as the anti-seepage reagent. The thickness of the concrete permeable plate can be selected as 10mm, 15mm, 20mm, etc., which can avoid the concrete being too thin to fully reflect the performance of the concrete specimen, resulting in ineffective filtration; it can also avoid the concrete being too thick, resulting in a long test time.

[0041] In specific implementation, a concrete penetration plate can be placed in the container to separate the container into two unconnected sides, liquid water is injected into both sides, and then a variety of reagents with gradient molecular weights are added to one side. After standing for 1 to 30 days, the reagent components are detected on the other side, and the molecular weight of the reagent with the largest detected molecular weight is obtained as the dividing value.

[0042] When detecting whether the seepage water body contains anti-seepage reagents, a molecular detection method can be used to directly detect whether the seepage water body contains anti-seepage reagent components; at this time, a water sample collection tube can be directly set on the top seat 3 to collect seepage water samples, and the seepage water samples can be directly transported to the molecular detection module for molecular detection, thereby realizing an automated or semi-automated anti-seepage detection system composed of an anti-seepage instrument sealing assembly and a molecular detection module.

[0043] In specific implementation, the effect of the anti-seepage agent on the water properties can also be detected to determine whether the anti-seepage agent exists in the seeping water body.

[0044] When the anti-seepage reagent is a colored reagent, i.e., a pigment, light can be irradiated into the seepage water body, and a photosensitive element can be used to determine whether diffuse reflection light of the corresponding color light exists in the seepage water body. For example, the anti-seepage reagent is a red reagent such as red ink, and light will produce infrared diffuse reflection in the red liquid. At this time, it is only necessary to irradiate light into the seepage water body and use an infrared diffuse reflection sensor to detect whether there is infrared light in the seepage water body, so as to determine whether there is a red reagent in the seepage water body.

[0045] When the anti-seepage agent is selected from phenol, hydrocarbon, alcohol, carboxylic acid, carbon black, organic matter, etc., which can affect the turbidity of water, it is only necessary to irradiate light in the seepage water body and use a photosensitive element such as a photosensitive sensor to detect the light intensity in the seepage water body, so as to know the light penetration rate in the seepage water body, thereby judging whether there is an anti-seepage agent in the seepage water body. At this time, if the photosensitive sensor detects light, it means that the light penetration rate of the seepage water body is high, the anti-seepage agent is filtered, and the seepage detection result is valid; on the contrary, if the photosensitive sensor does not detect light or the light intensity is extremely small, it means that the anti-seepage agent is not filtered, and the seepage water body is likely to pass through the B path in Figure 1 (a), and the seepage detection result is invalid.

[0046] When the anti-seepage reagent is selected as acid, alkali, salt, etc., it can affect the conductivity of water. It is only necessary to set positive and negative electrodes in the seeping water body. After power is turned on, the conductivity of the seeping water body can be calculated, and the presence of anti-seepage reagent in the seeping water body can be judged according to the change in conductivity.

[0047] During specific implementation, the sensor structure for detecting water seepage, such as the combined structure of positive and negative electrodes, light source and photosensitive element, can be directly set at the bottom of the top seat 3 to achieve integrated detection; a guide tube can also be set at the bottom of the top seat 3 of the water seepage detection device to collect water seepage, so as to test the water seepage situation through the sensor structure outside the device.

[0048] For those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0050] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for judging the effectiveness of water seepage in concrete anti-seepage testing, characterized in that: The following steps are involved: S1. Construct a sealed testing environment, block the concrete specimen in the channel, continuously add water to one side of the concrete specimen to increase the pressure, add anti-seepage reagent to the water, and detect the seepage water on the other side of the concrete specimen; S2. If no seepage water is detected at the completion of the test, the concrete specimen is judged to be qualified; If a seepage water body is detected when the test is completed, step S3 is executed; S3, detect whether there is an anti-seepage reagent in the seepage water body; if yes, judge that this test is invalid; if no, judge that the concrete specimen is seeping; In the concrete specimen impermeability test, the filtering characteristics of the concrete specimen on the macromolecular structure are used, and an impermeability reagent is added to the water to determine whether the seepage path passes through the concrete specimen; The molecular weight of the anti-seepage reagent is greater than the maximum molecular weight that can pass through the concrete specimen, so as to avoid misjudgment of the seepage path caused by too small molecular weight passing through the concrete specimen with the water body.

2. The method for judging the effectiveness of water seepage for concrete anti-seepage testing according to claim 1, characterized in that: The method for selecting the anti-seepage agent is as follows: first, a concrete penetration plate with a thickness of 10mm-20mm is made, the maximum molecular weight that can pass through the concrete penetration plate is tested as the dividing value, and the agent with a molecular weight greater than the dividing value is selected as the anti-seepage agent.

3. The method for judging the effectiveness of water seepage in concrete anti-seepage testing according to claim 2, characterized in that: The method for testing the maximum molecular weight that can pass through the concrete permeable plate is as follows: place the concrete permeable plate in a container, separate the container into two unconnected sides, inject liquid water on both sides, and then add a variety of reagents with gradient molecular weight changes on one side. After standing for 1 day to 30 days, detect the reagent components on the other side and obtain the molecular weight of the reagent with the largest detected molecular weight as the dividing value.

4. The method for judging the effectiveness of water seepage in concrete anti-seepage testing according to any one of claims 1 to 3, characterized in that: The method for detecting whether the seepage water body contains the anti-seepage agent is: obtaining the influence of the anti-seepage agent on the water body, detecting whether the seepage water body retains the influence characteristics, and if so, judging that the seepage is invalid; The influencing properties include at least one of turbidity, color and conductivity.

5. The method for judging the effectiveness of water seepage in concrete anti-seepage testing according to claim 4, characterized in that: When the property of the water body affected by the anti-seepage reagent is color, light is irradiated into the seepage water body, and a photosensitive element is used to determine whether there is diffuse reflection of the corresponding color light in the seepage water body. If yes, the water seepage detection is invalid; if no, the water seepage detection is valid; When the property of the water body affected by the anti-seepage reagent is turbidity, light is irradiated into the seepage water body, and the light intensity in the seepage water body is detected by using a photosensitive element; when the light intensity reaches the set threshold, it is judged that the seepage detection is effective; otherwise, it is invalid; When the property affected by the anti-seepage agent on the water body is conductivity, positive and negative electrodes are set in the seepage water body to test the conductivity of the seepage water body and determine whether the anti-seepage agent exists in the seepage water body.

6. The method for judging the effectiveness of water seepage in concrete anti-seepage testing according to any one of claims 1 to 3, characterized in that: The method for detecting whether the seepage water body contains the anti-seepage reagent is: collecting water samples from the seepage water body, and using molecular detection methods to detect whether the water samples contain anti-seepage reagent components.

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