A device for testing the permeability of waterproof materials

Abstract

This utility model relates to a waterproof material permeability testing device, comprising a box, a cylinder, and a U-shaped tube. The front end of the box is a recessed receiving groove, and a baffle is provided at the front end of the box at the bottom of the receiving groove. A partition is provided in the middle of the receiving groove, and a groove is provided on the partition. A through hole is provided in the middle of the groove. The U-shaped tube is vertically installed on the outside of the box, with its front end extending into the receiving groove and connecting upward to the through hole. A removable sealing cap is provided at the rear end of the U-shaped tube. The cylinder is installed on the top of the box, with its output end extending downward into the receiving groove. A pressure plate is provided at the output end of the cylinder, located above the through hole. This utility model tests a sample block coated with waterproof material using a water column, and observes whether the outer surface of the sample block is wet through static tests at time intervals such as 24h and 48h. At the same time, the sample block is cut open to observe whether its interior is wet, thereby determining whether the waterproof coating has been breached by water pressure, and thus evaluating whether the permeability of the waterproof material is qualified.

Description

Technical Field

[0001] This utility model relates to the field of waterproof material quality inspection technology, specifically to a waterproof material permeability testing device. Background Technology

[0002] Waterproofing materials are indispensable key functional materials in building engineering, underground engineering, water conservancy facilities, and many industrial fields. Their core mission is to effectively block the penetration of liquid water, ensure structural safety, extend service life, and maintain the dryness and stability of the internal environment. The impermeability of a material, that is, its ability to resist the penetration of water under certain pressure or concentration gradients, is one of the most crucial indicators for evaluating the performance of waterproofing materials, assessing their engineering applicability, and predicting their service life. Permeability testing is the standard technical means to quantitatively evaluate this key performance of waterproofing materials. The core principle of this test is to simulate the water pressure conditions that the material may encounter in actual service environments. By applying controllable hydrostatic pressure, water vapor partial pressure difference, or chemical concentration difference, the rate of water penetration through a material sample of a specific thickness, the amount of water permeated, or the time and pressure threshold required to reach a specific permeation state are observed and measured. Currently, the commonly used test method is the hydrostatic pressure method, which requires the use of hydrostatic pressure equipment to apply increasing or constant water pressure to one side of the sample, measuring the water seepage on the other side or the time and pressure required to reach a specified amount of water seepage. However, the number of hydrostatic pressure equipment is limited, and the cost is high, making it difficult to meet the growing testing needs. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a waterproof material permeability testing device. Through a simple device designed independently, the permeability of waterproof materials can be tested in batches.

[0004] The technical solution of this utility model is as follows: a waterproof material permeability testing device, comprising a box, a cylinder, and a U-shaped tube. The front end of the box is a recessed receiving groove. A baffle is provided at the front end of the box located at the bottom of the receiving groove. A partition is provided in the middle of the receiving groove. A groove is provided on the partition. A through hole is provided in the middle of the groove. The U-shaped tube is vertically installed on the outside of the box. The front end of the U-shaped tube extends into the receiving groove and connects upward to the through hole. A detachable sealing cap is provided at the rear end of the U-shaped tube. The cylinder is installed on the top of the box. The output end of the cylinder extends downward into the receiving groove. A pressure plate is provided at the output end of the cylinder. The pressure plate is located above the through hole.

[0005] Furthermore, the groove is opened laterally on the partition layer.

[0006] Furthermore, an elastic washer is provided on the groove, and the elastic washer is located outside the through hole.

[0007] Furthermore, the front end of the partition is located within the receiving groove.

[0008] Furthermore, a water pumping pipe leading to the bottom of the receiving trough is provided on the outside of the box.

[0009] Furthermore, the sealing cap is a rubber stopper.

[0010] Furthermore, the side of the U-shaped tube located on the outside of the box is provided with scale lines.

[0011] Furthermore, a reinforcing plate is provided on the outside of the box, and the U-shaped tube passes through the reinforcing plate.

[0012] Compared with the prior art, the advantages of this utility model are as follows: by testing the test block coated with waterproof material with a water column, and by observing whether the outer surface of the test block is wet through static tests for time periods such as 24h and 48h, and at the same time cutting the test block to observe whether its interior is wet, it can be determined whether the waterproof coating has been broken through by water pressure, thereby evaluating whether the permeability of the waterproof material is qualified. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a structural diagram of the back of the present invention.

[0017] Among them: 31, box body; 3101, receiving groove; 32, partition; 3201, groove; 3202, through hole; 33, cylinder; 34, pressure plate; 35, U-shaped tube; 3501, scale line; 36, sealing cover; 37, baffle; 38, elastic washer; 39, drain pipe; 40, reinforcing plate. Detailed Implementation

[0018] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] like Figure 1-3As shown, a waterproof material permeability testing device includes a housing 31, a cylinder 33, and a U-shaped tube 35. The front end of the housing 31 is a recessed receiving groove 3101. A baffle 37 is provided at the front end of the housing 31, located at the bottom of the receiving groove 3101, forming a water collection trough at the bottom of the receiving groove 3101. A partition 32 is provided in the middle of the receiving groove 3101, and a groove 3201 is provided on the partition 32 for placing test blocks. A through hole 3202 is provided in the middle of the groove 3201. The U-shaped tube 35 is vertically installed on the outside of the housing 31, with a lower front end and a higher rear end. The front end of the U-shaped tube 35 extends into the receiving groove 3101 and connects upward to the through hole 3202. A removable sealing cap 36 is provided at the rear end of the U-shaped tube 35. The cylinder 33 is installed on the top of the housing 31, and the output end of the cylinder 33 extends downward into the receiving groove 3101. In the placement groove 3101, the output end of the cylinder 33 is equipped with a pressure plate 34, which is located above the through hole 3202. Water is injected into the U-shaped tube 35 until the liquid level reaches the upper end face of the through hole 3202. Under the action of the surface tension of the water, the liquid level slightly protrudes from the upper end face of the through hole 3202. At this time, the test block coated with waterproof material is placed upside down in the groove 3201, with the waterproof coating facing the through hole 3202 and sealing it. The test block is pressed down by the cylinder 33. Then, water is injected into the tube from the rear end of the U-shaped tube 35 until the water column reaches a certain height and can provide a certain water pressure. Through static tests at time intervals of 24h and 48h, the outer surface of the test block is observed to see if it is wet. At the same time, the test block is cut open to observe whether its interior is wet, thereby judging whether the waterproof coating has been broken through by the water pressure, and thus evaluating whether the permeability of the waterproof material is qualified.

[0020] In the above embodiment, the groove 3201 is side-opening on the partition 32, allowing water overflowing from the U-shaped tube 35 to drain into the water collection tank through the groove 3201, preventing the test block from being immersed in water and becoming completely wet, thus affecting the assessment of the waterproof material's permeability. An elastic washer 38 is provided on the groove 3201, located outside the through hole 3202. The elastic washer 38 increases the clearance of the test block from the ground on the groove 3201, preventing residual water in the groove 3201 from wetting the test block. It also improves the tightness of the connection between the waterproof coating, the elastic washer 38, and the through hole 3202 of the groove 3201, preventing water from overflowing from the connection point under the water pressure of the water column in the U-shaped tube 35. The front end of the partition 32 is located within the receiving groove 3101, allowing water to flow smoothly into the water collection tank at the front end of the partition 32 during water replenishment to the U-shaped tube 35 or during the test. The outer side of the housing 31 is equipped with a water suction pipe leading to the bottom of the receiving tank 3101, which can promptly remove water when the liquid level in the collection tank is too high. The sealing cover 36 is a rubber stopper, which is easy to install and remove and has good sealing performance. The side of the U-shaped tube 35 located on the outer side of the housing 31 is equipped with scale lines 3501 for easy observation of water volume, thereby accurately achieving the predetermined water pressure. The outer side of the housing 31 is equipped with a reinforcing plate 40, through which the U-shaped tube 35 passes, providing structural support for the U-shaped tube 35.

[0021] Description of the working principle of this utility model:

[0022] Cement and sand were molded into standard test blocks measuring 6cm*6cm*2cm. After 28 days of standard curing, water-based waterproofing material was applied to the surface of the test blocks. The amount applied was based on the minimum amount required to fully cover the base surface of the test blocks. Ten test blocks were coated with each set of waterproofing material as a comparison reference to eliminate the possible influence of coating thickness differences on permeability. Water was injected into the front end of the U-shaped tube 35 at the location of groove 3201 until the liquid level overflowed from the elastic washer 38. Eight of the test blocks were placed upside down on the elastic washer 38, at which point the test blocks were just embedded in the groove 3201. The pressure plate 34 was pushed by the cylinder 33 to compress the elastic washer 38 downwards, thereby forming a tight connection. Water was injected into the rear end of the U-shaped tube 35 until the liquid level reached the 1m mark of the scale 3501. This is equivalent to forming a 1m water column inside the U-shaped tube 35, corresponding to the location of the waterproof coating. According to the principle of communicating vessels, the water pressure provided by the water column was used to conduct a permeability test on the front end of the waterproof coating. Observe the water column height at 24h, 48h, 7 days, and 28 days to see if there is any change. Touch the test block to feel if it is wet. If there is no change, end the test on the 28th day, remove the test block, cut it horizontally, and observe whether there are any signs of penetration inside to determine if the permeability is qualified. If some test blocks become wet or the water column height decreases during this period, remove the corresponding test block and record the test duration. After all test blocks have been tested, evaluate the overall situation to see if the wetted test block is an exception and whether it needs to be repeated. If the permeability test is qualified, mark the back of the remaining two test blocks and store them in the laboratory warehouse for later review, inspection, and repeat testing.

[0023] For waterproofing materials such as modified bitumen rolls, polymer rolls, or rubber rolls, they can be cut to a size of 6cm*6cm, placed on the elastic washer 38 in the same way, and then the test block is pressed on the waterproofing material. Repeating the above steps can test the permeability of roll-type waterproofing materials.

[0024] For frequent initial screening tests of 24h and 48h, when replacing test blocks coated with different waterproof materials, the rear end of the U-shaped tube can be sealed with a rubber stopper, and then the pressure plate 34 can be loosened and the test block removed by the cylinder 33. The water column height is kept basically constant by atmospheric pressure, and the elastic washer 38 is appropriately replenished with water. Then the new test block is installed and pressed to quickly replace the test block.

[0025] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the permeability of waterproof materials, comprising a housing, a cylinder, and a U-shaped tube, characterized in that: The front end of the box is a recessed receiving groove. A baffle is provided at the front end of the box at the bottom of the receiving groove. A partition is provided in the middle of the receiving groove. A groove is provided on the partition. A through hole is provided in the middle of the groove. A U-shaped tube is vertically installed on the outside of the box. The front end of the U-shaped tube extends into the receiving groove and connects upward to the through hole. A removable sealing cap is provided at the rear end of the U-shaped tube. A cylinder is installed on the top of the box. The output end of the cylinder extends downward into the receiving groove. A pressure plate is provided at the output end of the cylinder. The pressure plate is located above the through hole.

2. The waterproof material permeability testing device according to claim 1, characterized in that: The groove is opened on the side of the partition.

3. The waterproof material permeability testing device according to claim 1, characterized in that: An elastic washer is provided on the groove, and the elastic washer is located outside the through hole.

4. The waterproof material permeability testing device according to claim 1, characterized in that: The front end of the partition is located within the receiving groove.

5. The waterproof material permeability testing device according to claim 1, characterized in that: The outer side of the box is equipped with a water pump pipe leading to the bottom of the receiving tank.

6. The waterproof material permeability testing device according to claim 1, characterized in that: The sealing cap is a rubber stopper.

7. The waterproof material permeability testing device according to claim 1, characterized in that: The U-shaped tube located on the outside of the box has scale lines on its side.

8. The waterproof material permeability testing device according to claim 1, characterized in that: The outer side of the box is equipped with a reinforcing plate, and the U-shaped tube passes through the reinforcing plate.

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