Testing device for simulating water flow impact effect on asphalt film test piece

Abstract

The utility model provides a testing device for simulating water flow impact effect on an asphalt film test piece, which comprises a test piece fixing device and a testing device, the test piece fixing device is positioned below the testing device and is used for arranging the asphalt film test piece, and absorbent paper is arranged below the asphalt film test piece; the test device comprises a water container, the height position of the water container relative to the test piece fixing device is adjustable, the water outlet flow rate of the water container is adjustable, and during working, a water outlet of the water container is opposite to the asphalt film test piece so as to apply dynamic water scouring to the asphalt film test piece through outlet water. The device is simple in structure, dynamic water scouring of the test piece can be realized, and the waterproof performance of the test piece can be quantitatively evaluated conveniently.

Description

Technical Field

[0001] The utility model belongs to the field of asphalt performance testing, and particularly relates to a testing device for simulating the impact of water flow on asphalt thin-film specimens. Background Technique

[0002] Water is the main cause of freeze-thaw damage to bridge deck concrete and corrosion of steel bars. Therefore, waterproof membranes or waterproof layers are widely used in bridge deck paving. Asphalt materials are often used as waterproof adhesive layers for bridge deck paving due to their certain hydrophobicity. However, there is currently no specification for testing and evaluating the waterproof performance of asphalt binders when used as waterproof adhesive layers for road surfaces or bridge decks.

[0003] "Test Methods for Building Waterproofing Membranes - Part 10: Water Impermeability of Asphalt and Polymer Waterproofing Membranes" (GB / T 328.10 - 2007) stipulates two methods for detecting the water impermeability of asphalt waterproofing membranes: Method A (the structure used is as Figure 1 shown) and Method B (the structure used is as Figure 2 shown). These two test methods apply water pressure on one side of the specimen and evaluate the waterproof performance of the specimen by observing whether water seeps through the other side, whether the moisture indicator mixture on the other side changes color, or whether the water pressure suddenly decreases. However, the equipment used in both methods is relatively complex (many current patent solutions for waterproof performance testing also have the same problem), and there are high requirements for the sealing performance at the contact between the specimen and the test device. At the same time, both test methods require a placement time of 24 hours, and the test takes a long time. Moreover, in both test methods, the static water pressure is applied to the specimen, but the asphalt waterproof adhesive layer may be subjected to the action of dynamic water scouring under the action of vehicle loads during service. Therefore, the force application forms in the above two methods are also inconsistent with the actual stress conditions of the asphalt waterproof adhesive layer. In addition, the results of the two test methods can only qualitatively evaluate whether the specimen is waterproof, and cannot quantitatively evaluate the waterproof performance of the specimen or make a horizontal comparison of the waterproof performance of different specimens (the water closure test also has this problem). In particular, if Method A in the specification is used to detect the waterproof performance of asphalt thin-film specimens, since filter paper, moisture indicator mixture, and glass plates need to be placed above the specimen, the asphalt thin-film specimen may deform under the self-weight of the above materials, affecting the test results.

[0004] In addition to the two methods mentioned in the specification, currently, the waterproofness of materials can also be evaluated through a water closure test, that is, using the material to be tested to make a container-type specimen, then adding water to the specimen, observing the change of the water level over time, and then evaluating the waterproofness of the material according to whether the water level drops after a period of time. However, this method also has the problem of being able to only qualitatively evaluate and unable to quantitatively evaluate.

[0005] When asphalt is used as a waterproof material, the standard test method for detecting its waterproof performance is currently only specified in "Test Methods for Building Waterproofing Membranes - Part 10: Water Impermeability of Bituminous and Polymer Waterproofing Membranes" (GB / T 328.10 - 2007). As described above, it is inappropriate to use (GB / T 328.10 - 2007) to evaluate the waterproof performance of asphalt materials when used as waterproof bonding layers for road surfaces or bridge decks. Therefore, there is currently no corresponding standard test method in the field of road engineering or bridge deck paving. Summary of the Invention

[0006] In order to solve at least one of the problems existing in the prior art, the present invention proposes a device for evaluating the impact leakage resistance of asphalt film specimens, which can solve the problems that there are no waterproof performance evaluation methods and indicators for asphalt film specimens, and the relevant test methods and equipment are cumbersome and time-consuming, and a simpler test device is proposed. By setting a water-containing container above the specimen, the purpose of applying dynamic water scouring to the specimen is achieved. By setting absorbent paper below the specimen, the weight change of the absorbent paper before and after the test can be measured, which is convenient for quantitatively evaluating the waterproof performance of the specimen.

[0007] To achieve the object of the present invention, a test device for simulating the impact of water flow on asphalt film specimens provided by the present invention includes a specimen fixing device and a test device.

[0008] The specimen fixing device is located below the test device, used to set the asphalt film specimen, and absorbent paper is arranged below the asphalt film specimen.

[0009] The test device includes a water-containing container, the height position of the water-containing container relative to the specimen fixing device is adjustable, and the water flow rate at the outlet of the water-containing container is adjustable. During operation, the outlet of the water-containing container faces the asphalt film specimen to apply dynamic water scouring to the asphalt film specimen through the outlet water.

[0010] Further, the specimen fixing device includes a fixing plate, through holes are provided on the fixing plate, the absorbent paper is embedded in the through holes, and the asphalt film specimen is fixed on the fixing plate and covers the through holes.

[0011] Further, the fixing plate is inclined.

[0012] Further, the specimen fixing device further includes a triangular column, and the fixing plate is fixed on the inclined surface of the triangular column.

[0013] Further, a drip device with adjustable flow rate is provided on the water-containing container.

[0014] Further, the drip device includes a flow rate regulating valve.

[0015] Furthermore, the testing device further includes a bench and a bench rod located on the bench, and the water-containing container is detachably arranged at different height positions on the bench rod.

[0016] Furthermore, the testing device further includes a detachable connecting part and a water-containing container fixing part. The detachable connecting part is detachably connected to the bench rod, and the water-containing container fixing part is used for fixing the water-containing container and is connected to the detachable connecting part.

[0017] Furthermore, the detachable connecting part adopts a cross clamp.

[0018] Furthermore, the water-containing container fixing part adopts a flask clamp.

[0019] Compared with the prior art, the utility model can at least achieve the following beneficial effects:

[0020] (1) The utensils used in the utility model do not exceed ten pieces, and the acquisition methods of various utensils and the assembly methods between the utensils are very simple, that is, the device is simpler than the existing device and more convenient to use;

[0021] (2) The utility model can control the water outlet speed of the water-containing container and can control the time required to complete the test. For example, at a certain dripping speed, 500 ml of water can be dripped within 1 h, and the test takes less time;

[0022] (3) The utility model can adjust the height of the water-containing container relative to the asphalt film specimen, so as to achieve different degrees of dynamic water impact pressure on the asphalt film specimen, which is more in line with the stress characteristics when asphalt is used as a waterproof bonding layer, and can make the test results more accurate. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0024] Figure 1It is a schematic structural diagram of the test structure adopted by Method A in the current standard GB / T 328.10 - 2007. In the figure, 1 - lower rubber sealing washer, 2 - water-facing surface of the specimen (usually the surface exposed to the atmosphere / water), 3 - laboratory filter paper, 4 - moisture indicating mixture, 5 - laboratory filter paper, 6 - circular ordinary glass plate, 7 - upper rubber sealing washer, 8 - metal clamping ring, 9 - wing nut, 10 - exhaust valve, 11 - water inlet valve, 12 - water replenishing and drainage valve, 13 - device for providing and controlling water pressure to 60 kPa.

[0025] Figure 2 It is a schematic structural diagram of the test structure adopted by Method B in the current standard GB / T 328.10 - 2007. In the figure, 14 - cover, 15 - specimen, 16 - static pressure, 17 - observation hole, 18 - slotted disc.

[0026] Figure 3 It is a schematic structural diagram of a test device provided by an embodiment of the present utility model for simulating the impact of water flow on an asphalt film specimen.

[0027] Figure 4 It is Figure 3 a side view of.

[0028] Figure 5 It is a schematic structural diagram of a specimen fixing device in a test device provided by an embodiment of the present utility model for simulating the impact of water flow on an asphalt film specimen.

[0029] Figures 3 to 5 In it, 100 - test device, bench 101, bench rod 102, flask clamp 103, cross clamp 104, water container 105, drip device 106; specimen fixing device 200, triangular column 201, fixing plate 202, through hole 2021. Detailed implementation manner

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts are within the scope of protection of the present utility model.

[0031] "Test Methods for Building Waterproofing Membranes - Part 10: Watertightness of Bituminous and Polymer Waterproofing Membranes" (GB / T 328.10-2007) specifies two methods for testing the watertightness of bituminous waterproofing membranes. However, the devices used in the two methods provided are relatively complex, the testing takes a long time, and the results obtained can only qualitatively evaluate whether the sample is waterproof. Therefore, it is necessary to design a test method with a simple device and shorter time consumption.

[0032] Please refer to Figures 3 to 5 , a testing device provided by the present utility model for simulating the impact of water flow on a bituminous film specimen, includes a testing device 100 (the structure is shown in Figure 3 ) and a specimen fixing device 200 (the structure is shown in Figure 5 ). The specimen fixing device 200 is located below the testing device 100, used to set the bituminous film specimen, and absorbent paper is arranged below the bituminous film specimen; the testing device includes a water-containing container 105, the height position of the water-containing container 105 relative to the specimen fixing device 200 is adjustable, and the water outflow rate of the water-containing container 105 is adjustable. During operation, the water outlet of the water-containing container 105 faces the bituminous film specimen to apply dynamic water scouring to the bituminous film specimen through the water outlet.

[0033] Adopting the above solution, by arranging the water-containing container 105 capable of discharging water above the bituminous film specimen, dynamic water scouring can be applied to the bituminous film specimen. Compared with the static water pressure applied in the prior art, the dynamic water scouring of the bituminous film specimen is more in line with the actual stress. And the adjustable height of the water-containing container 105 can achieve different degrees of dynamic water impact pressure on the bituminous film specimen, achieving the purpose of adjustable scouring force. By arranging absorbent paper below the bituminous film specimen, the quantitative evaluation of the waterproof performance of the specimen can be realized by testing the weight change of the absorbent paper before and after.

[0034] In some embodiments of the present utility model, the testing device 100 further includes a bench 101, a bench rod 102 located on the bench 101, a detachable connection part, and a water-containing container fixing part. The water-containing container 105 is detachably arranged at different height positions of the bench rod 102. The detachable connection part is detachably connected to the bench rod 102. The water-containing container fixing part is used to fix the water-containing container 105 and is connected to the detachable connection part.

[0035] Preferably, the bench 101 is an iron stand, and the bench rod 101 is an iron stand rod. The iron stand rod is fixedly connected to the iron stand through a nut.

[0036] Preferably, the detachable connection part adopts a cross clamp 104, and the water container fixing part adopts a flask clamp 103. The cross clamp 104 is a fixing fixture with screw holes at both ends. One end of the cross clamp 104 is fixed on the iron stand rod by a screw, and the other end is fixed to one end of the flask clamp 103 by a screw. The other end of the flask clamp 103 has a clamping part, and the clamping part is used to clamp the water container 105 to fix the water container 105.

[0037] In some embodiments of the present invention, the specimen fixing device 200 includes a fixing plate 202. A through hole 2021 is provided on the fixing plate 202, and the absorbent paper is embedded in the through hole 2021. The asphalt film specimen is fixed on the fixing plate 202 and covers the through hole.

[0038] Preferably, the specimen fixing device 200 further includes a triangular prism 201. The inclined surface of the triangular prism 201 covers the fixing plate 202, and the asphalt film specimen is arranged on the fixing plate 202. Setting the asphalt film specimen in an inclined form allows the water dripping on the asphalt film specimen to flow over the specimen surface to wash the specimen. At the same time, in the inclined state, the water can be discharged in time to prevent the accumulated water from dripping and seeping between the fixing plate and the triangular prism to wet the absorbent paper, thus affecting the test results.

[0039] In some embodiments of the present invention, the fixing plate 202 is a silica gel plate made of silica gel material, which is easily separated from the asphalt film specimen at room temperature, and the silica gel plate is waterproof / not easily wetted and damaged by water. In other embodiments, other materials can also be used.

[0040] In some embodiments of the present invention, an existing plastic bottle is used as the water container 105. The open end of the water container 105 is threaded and connected with a water dropper 106. A flow rate regulating valve for controlling the water flow rate is provided on the water dropper 6. In other embodiments, other containers can also be used as the water container, and a water dropper with adjustable flow rate is provided at the water outlet.

[0041] The usage process of the device provided in the foregoing embodiments is as follows:

[0042] ① Fix the fixing plate 202 on the surface of the triangular prism 201 using double-sided tape;

[0043] ② Weigh 3 dry absorbent papers to obtain the mass m1 of the dry absorbent papers. The absorbent papers are rectangular, and the length and width dimensions are slightly smaller than the through hole 2021;

[0044] ③ Embed the absorbent paper in the through hole 2021;

[0045] ④ Prepare asphalt films with different thicknesses as needed. Select a flat and pothole-free area on the asphalt film and cut it. The length and width dimensions of the cut specimen should be larger than those of the through-hole 2021 to obtain an asphalt film specimen.

[0046] ⑤ Cover the through-hole 2021 with the cut asphalt film specimen.

[0047] ⑥ Stick four sections of plastic tape around the asphalt film specimen. Each section of plastic tape has part closely attached to the asphalt film specimen and the other part closely attached to the surface of the fixed plate 202, so that the asphalt film specimen is fixed on the fixed plate 202 and plastic tape is attached around it, which can prevent moisture from infiltrating into the through-hole 2021 from the surrounding of the asphalt film specimen.

[0048] The above steps complete the installation of the asphalt film specimen on the specimen fixing device.

[0049] ⑦ Place the asphalt film specimen fixing device on the iron stand, such that the through-hole 2021 covered with the asphalt film specimen faces the water dripper 106.

[0050] ⑧ Adjust the flask clamp 103 to a preset height through the cross clamp 104.

[0051] ⑨ Add a preset volume of water, such as 500 ml of water, to the water container 105.

[0052] ⑩ Open the water dripper 106, adjust it to a preset dripping speed, and start timing.

[0053] After dripping for a preset time, such as 5 minutes, close the water dripper 106. Slightly lift the fixed plate 202 to take out the absorbent paper in the through-hole 2021 and weigh it, and record the mass m2 of the absorbent paper at this time.

[0054] Reinstall the absorbent paper into the through-hole 2021 and reopen the water dripper 106.

[0055] After 500 ml of water has completely dripped, take out the absorbent paper in the through-hole 2021 and record the mass m3 of the absorbent paper at this time.

[0056] Based on the data obtained from the test, the anti-impact leakage index can be calculated according to the mass of the absorbent paper before and after the test (anti-impact leakage refers to the waterproof performance of the specimen under the action of water flow impact), so as to facilitate the subsequent quantitative or qualitative evaluation of the anti-impact leakage performance of the asphalt film specimen under short-term and long-term actions.

[0057] Evaluate the short-term and long-term impact leakage resistance of asphalt thin-film specimens according to Equations (1) and (2) respectively.

[0058] Impact leakage index under short-term water flow

[0059] Impact leakage index under long-term water flow

[0060] If A i = 1 (i = 1, 2), it can be determined that the asphalt thin-film specimen of this thickness will not leak water under dynamic water impact. When A1 equals 1, it means the specimen will not leak water in the short term. When A2 equals 1, it means the specimen will not leak water in the short term and also means the specimen will not leak water in the long term. In other cases, the impact leakage resistance performance of different thin-film specimens can be quantitatively evaluated and compared according to the calculated impact leakage resistance.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test device for simulating the impact of water flow on asphalt thin-film specimens, characterized in that, It includes a specimen fixing device and a testing device. The specimen fixing device is located below the testing device, and is used to set up an asphalt thin film specimen, and absorbent paper is arranged below the asphalt thin film specimen. The testing device includes a water containing container, the height position of the water containing container relative to the specimen fixing device is adjustable, and the water outflow rate of the water containing container is adjustable. During operation, the water outlet of the water containing container faces the asphalt thin film specimen to apply dynamic water scouring to the asphalt thin film specimen through the outflow of water.

2. The testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 1, wherein The specimen fixing device includes a fixing plate, through holes are arranged on the fixing plate, the absorbent paper is embedded in the through holes, and the asphalt thin film specimen is fixed on the fixing plate and covers the through holes.

3. The testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 2, wherein, The fixing plate is arranged obliquely.

4. The testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 2, characterized in that, The specimen fixing device further includes a triangular prism, and the fixing plate is fixed on the inclined surface of the triangular prism.

5. A testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 1, characterized in that, A water dropper with adjustable flow rate is arranged on the water containing container.

6. The testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 5, characterized in that, The water dropper includes a flow rate regulating valve.

7. A test device for simulating the impact of water flow on asphalt thin-film specimens according to any one of claims 1-6, characterized in that, The testing device further includes a bench and a bench rod located on the bench, and the water containing container is detachably arranged at different height positions on the bench rod.

8. A testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 7, characterized in that, The testing device further includes a detachable connecting part and a water containing container fixing part. The detachable connecting part is detachably connected to the bench rod, and the water containing container fixing part is used to fix the water containing container and is connected to the detachable connecting part.

9. The testing device for simulating the impact of water flow on asphalt thin-film specimens according to claim 8, characterized in that, The detachable connecting part adopts a cross clip.

10. A test device for simulating the impact of water flow on asphalt thin-film specimens according to claim 8, characterized in that, The water containing container fixing part adopts a flask clip.

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